Journal articles: 'Biosorption sites'

1

Parvathi, K., R. Nareshkumar, and R. Nagendran. "MANGANESE BIOSORPTION SITES OFSACCHAROMYCES CEREVISIAE." Environmental Technology 28, no. 7 (July 2007): 779–84. http://dx.doi.org/10.1080/09593332808618833.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Fu, Yuzhu, and T. Viraraghavan. "Dye biosorption sites in Aspergillus niger." Bioresource Technology 82, no. 2 (April 2002): 139–45. http://dx.doi.org/10.1016/s0960-8524(01)00172-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Kapoor, Anoop, and T. Viraraghavan. "Heavy metal biosorption sites in Aspergillus niger." Bioresource Technology 61, no. 3 (September 1997): 221–27. http://dx.doi.org/10.1016/s0960-8524(97)00055-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Tsezos, M., E. Remoudaki, and V. Angelatou. "Biosorption sites of selected metals using electron microscopy." Comparative Biochemistry and Physiology Part A: Physiology 118, no. 3 (November 1997): 481–87. http://dx.doi.org/10.1016/s0300-9629(97)00009-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Lee, Yi Chao, Shui Ping Chang, Chih Sheng Lee, and Nien Hsin Kao. "Influence of Pigment Extraction on Pb(II) Biosorption of Cladophora and Spirogyra Algae Powder." Advanced Materials Research 610-613 (December 2012): 3591–98. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.3591.

Full text

Abstract:

The Cladophora and Spirogyra genera are classified within the green algae division. Species belonging to these genera comprise large filamentous algae, possess significant biomass, and are found in freshwater around the world. These characteristics give Cladophora and Spirogyra high potential to be developed as biological materials. For this study, we harvested fresh Cladophora and Spirogyra and produced algae powder using two of conventional procedures: with pigment extraction and without pigment extraction. The resulting algae powders were subjected to Pb(II) biosorption, and the differences in biosorption rates were subsequently analyzed. Our study found the following: (i) significant differences in cell structure, cell wall thickness, the type and content of cell composition, and the quantity of epiphytes between Cladophora and Spirogyra. This variation influenced the functional groups within the resulting algae powders and their binding sites, which further led to different levels of Pb(II) adsorption. (ii) Glacial acetic acid, a compound commonly employed in pigment extraction procedures, affected the functional groups and the binding sites of the resulting algae powders. For Cladophora algae powder, Pb(II) biosorption was reduced by 16.6 %; whereas for Spirogyra algae powder, Pb(II) biosorption was reduced by 19.8 %. (iii) The pigment extraction procedure exerted the most significant influence on the carbonyl groups and hydroxyl groups in algae powder. (iv) The pigment extraction procedure is not suitable for the preparation of algae powders which will be used for metal ion biosorption.

APA, Harvard, Vancouver, ISO, and other styles

6

Zinicovscaia, Inga, Nikita Yushin, Daler Abdusamadzoda, Dmitrii Grozdov, and Margarita Shvetsova. "Efficient Removal of Metals from Synthetic and Real Galvanic Zinc–Containing Effluents by Brewer’s Yeast Saccharomyces cerevisiae." Materials 13, no. 16 (August 16, 2020): 3624. http://dx.doi.org/10.3390/ma13163624.

Full text

Abstract:

The performance of the brewer’s yeast Saccharomyces cerevisiae to remove metal ions from four batch systems, namely Zn(II), Zn(II)-Sr(II)-Cu(II), Zn(II)-Ni(II)-Cu(II), and Zn(II)-Sr(II)-Cu(II)-Ba(II), and one real effluent was evaluated. Yeast biosorption capacity under different pH, temperature, initial zinc concentration, and contact time was investigated. The optimal pH for removal of metal ions present in the analyzed solution (Zn, Cu, Ni, Sr, and Ba) varied from 3.0 to 6.0. The biosorption process for zinc ions in all systems obeys Langmuir adsorption isotherm, and, in some cases, the Freundlich model was applicable as well. The kinetics of metal ions biosorption was described by pseudo-first-order, pseudo-second-order, and Elovich models. Thermodynamic calculations showed that metal biosorption was a spontaneous process. The two-stage sequential scheme of zinc ions removal from real effluent by the addition of different dosages of new sorbent allowed us to achieve a high efficiency of Zn(II) ions removal from the effluent. FTIR revealed that OH, C=C, C=O, C–H, C–N, and NH groups were the main biosorption sites for metal ions.

APA, Harvard, Vancouver, ISO, and other styles

7

Lu, Wenlong, Yifeng Xu, Chuanzhou Liang, Baba Imoro Musah, and Lai Peng. "Simultaneous Biosorption of Arsenic and Cadmium onto Chemically Modified Chlorella vulgaris and Spirulinaplatensis." Water 13, no. 18 (September 11, 2021): 2498. http://dx.doi.org/10.3390/w13182498.

Full text

Abstract:

The biosorption behaviour of arsenic(V) and cadmium(II) ions by unmodified and five types of chemically modified Chlorella vulgaris and Spirulina platensis was investigated. The biosorption rates of As(V) and Cd(II) in binary metal solutions were lower than those in sole metal systems, which exhibited a competition between As(V) and Cd(II) ions to occupy the active sites of the adsorbent. Among the five chemical reagents, NaCl and ZnCl2 were the most suitable modifiers for improving the biosorption performance of C. vulgaris and S. platensis, respectively. The maximum biosorption capacities of As(V) and Cd(II) were: (a) 20.9 and 1.2 mg/g, respectively, for C. vulgaris modified with NaCl; (b) 24.8 and 29.4 mg/g, respectively, for S. platensis modified with ZnCl2, which were much higher than those using other chemically modifying methods. The pseudo-second-order kinetic model fitted well with all the biosorption processes. The SEM analysis revealed that the modification changed the surface morphologies and enhanced the porosity of the algae biomass. The FTIR analysis established the presence of diverse groups of compounds that were largely hydroxyl, carboxylate, amino, and amide groups on the adsorbents that contributed significantly to the upregulated biosorption. This work showed the potential application of chemically modified C. vulgaris and S. platensis biomasses to effectively remove both from water.

APA, Harvard, Vancouver, ISO, and other styles

8

Xiao, Jun, Miyamoto Chikanori, Ke-Feng Yu, Seki Hideshi, Maruyama Hideo, and Pei-Min He. "Biosorption of heavy metals onto nonliving Laminaria japonica." Water Science and Technology 65, no. 8 (April 1, 2012): 1514–20. http://dx.doi.org/10.2166/wst.2012.042.

Full text

Abstract:

In this paper, study of the biosorption of Cd2+ and Pb2+ by nonliving Laminaria japonica in a batch adsorption system is described. The content of acidic sites and the dissociation constant of carboxylic acid functional groups (metal-binding site) of L. japonica were experimentally determined by conductometric and potentiometric titrations and theoretically predicated by using monodentate and bidentate binding models. The models are based on the monodentate or bidentate binding reactions of bivalent metal ions to acidic sites. The acidic site content and carboxylic acid dissociation constants determined are 1.25 and 0.18 mmol L−1, respectively. The results showed that the bidentate adsorption model fits well the biosorption of bivalent metal ions onto L. japonica with the bidentate binding constants for Cd2+ and Pb2+ being 5.72 × 103 and 6.24 × 104 L mol−1, respectively. The adsorption process of L. japonica followed the pseudo-second-order kinetics.

APA, Harvard, Vancouver, ISO, and other styles

9

Timková, Ivana, Jana Sedláková-Kaduková, and Peter Pristaš. "Biosorption and Bioaccumulation Abilities of Actinomycetes/Streptomycetes Isolated from Metal Contaminated Sites." Separations 5, no. 4 (November 12, 2018): 54. http://dx.doi.org/10.3390/separations5040054.

Full text

Abstract:

Heavy metal pollution is of great concern. Due to expansion of industrial activities, a large amount of metal is released into the environment, disturbing its fragile balance. Conventional methods of remediation of heavy metal-polluted soil and water are expensive and inefficient. Therefore, new techniques are needed to provide environmentally friendly and highly selective remediation. Streptomycetes, with their unique growth characteristics, ability to form spores and mycelia, and relatively rapid colonization of substrates, act as suitable agents for bioremediation of metals and organic compounds in polluted soil and water. A variety of mechanisms could be involved in reduction of metals in the environment, e.g., sorption to exopolymers, precipitation, biosorption and bioaccumulation. Studies performed on biosorption and bioaccumulation potential of streptomycetes could be used as a basis for further development in this field. Streptomycetes are of interest because of their ability to survive in environments contaminated by metals through the production of a wide range of metal ion chelators, such as siderophores, which provide protection from the negative effects of heavy metals or specific uptake for specialized metabolic processes. Many strains also have the equally important characteristic of resistance to high concentrations of heavy metals.

APA, Harvard, Vancouver, ISO, and other styles

10

Chang, Shui Ping, Yi Chao Lee, Chih Sheng Lee, and Nien Hsin Kao. "Using Gin Adsorption Model for Assessing the Influence of Algal Powder Bleach Process in Cu(II) Adsorption." Applied Mechanics and Materials 295-298 (February 2013): 123–28. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.123.

Full text

Abstract:

The Cladophora and Spirogyra algae examined in this study belong to the Chlorophyta division. Macro filamentous algae, which are widespread in fresh water worldwide, have high potential to be developed as biological materials because of their large biomass and availability. In this study, we collected fresh algae from where they grew and produced bleached and unbleached algae powder using to adsorb Cu(II) ion solution. After the biosorption process, we noted the following four significant findings: (i) The functional groups and binding sites in the produced algae powder were affected, causing variations in the amount of copper adsorbed. The variations resulted from differences in the cell structure, the cell wall thickness of Cladophora and Spirogyra algae, cell composition, and the types and amount of epiphytic algae. (ii) Common bleaching procedures using glacial acetic acid influenced the binding sites of the functional groups and the biomass of the produced powder. Because of the bleaching, the amount of copper adsorbed by the Cladophora powder declined by 14.2%, and by 15.7% for Spirogyra powder. (iii) The carbonyl and hydroxyl groups of unbleached powder were the main elements affected during the bleaching procedures. Examining whether the biosorption experiment results fit Gin’s biosorption model, we found that the biosorption amount and equilibrium reaction of the two bleached algae powders were inferior to that of the unbleached algae powders. (iv) The bleaching procedure using glacial acetic acid was not suitable for producing algae powder to use as an adsorbent for metal ions.

APA, Harvard, Vancouver, ISO, and other styles

11

Yang, Jing, Ji Yong Du, Shui Bo Xie, Kun Du, Ji Na Song, and Zhi Wei Lv. "Study on Biosorption of Heavy Metal Ion-Uranium by Citrobacter freudii." Advanced Materials Research 183-185 (January 2011): 600–604. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.600.

Full text

Abstract:

Biosorption has been developed as an effective and economic method to treat wastewater containing low concentrations of metal pollutants. In this study, a bacterium, Citrobacter freudii, was used as a biosorbent to adsorb uraniumions. The factors which influence the adsorption of uranium by Citrobacter freudii were investigated, including pH, the strain dosage and the initial concentrate of uranium. The results showed that the adsorption efficiency increased with the increased of pH in the beginning of the adsorption and reached its maximum at pH 6; when the strain dosage and the initial concentrate of uranium were 6.0g/L and 20mg/L, respectively, the adsorption efficiency reached 93.89% and 94.68%, respectively. The authors investigated the active sites of bacteria for biosorption and the results proved that carboxyl in the cell wall played an important role in biosorption.

APA, Harvard, Vancouver, ISO, and other styles

12

Javanbakht, Vahid, Seyed Amir Alavi, and Hamid Zilouei. "Mechanisms of heavy metal removal using microorganisms as biosorbent." Water Science and Technology 69, no. 9 (October 26, 2013): 1775–87. http://dx.doi.org/10.2166/wst.2013.718.

Full text

Abstract:

Release and distribution of heavy metals through industrial wastewaters has adverse affects on the environment via contamination of surface- and ground-water resources. Biosorption of heavy metals from aqueous solutions has been proved to be very promising, offering significant advantages such as low cost, availability, profitability, ease of operation, and high efficiency, especially when dealing with low concentrations. Residual biomasses of industrial microorganisms including bacteria, algae, fungi, and yeast have been found to be capable of efficiently accumulating heavy metals as biosorbent. This paper presents and investigates major mechanisms of biosorption and most of the functional groups involved. The biosorption process includes the following mechanisms: transport across cell membrane, complexation, ion exchange, precipitation, and physical adsorption. In order to understand how metals bind to the biomass, it is essential to identify the functional groups responsible for metal binding. Most of these groups have been characterized on the cell walls. The biosorbent contains a variety of functional sites including carboxyl, imidazole, sulfydryl, amino, phosphate, sulfate, thioether, phenol, carbonyl, amide, and hydroxyl moieties that are responsible for metal adsorption. These could be helpful to improve biosorbents through modification of surface reactive sites via surface grafting and/or exchange of functional groups.

APA, Harvard, Vancouver, ISO, and other styles

13

Kleinübing, S. J., Eric Guibal, and Meuris Gurgel Carlos da Silva. "Characterization of Sargassum sp. from Brazil and Evaluation of Cu²⁺ and Ni²⁺ Biosorption." Advanced Materials Research 71-73 (May 2009): 589–92. http://dx.doi.org/10.4028/www.scientific.net/amr.71-73.589.

Full text

Abstract:

Fundamental investigation on adsorption of Cu2+ and Ni2+ ions on Sargassum sp. was performed in fixed-bed column. The Langmuir isotherm fitted well the biosorption equilibrium and the maximum Cu2+ and Ni2+ uptake capacities were 1.35 and 1.06 mmolg- 1, respectively. Mappings of copper and nickel in the algae surface using energy dispersive X-ray spectroscopy indicated a homogeneous distribution of Cu- and Niadsorbent sites. Fourier-transform infrared analysis revealed that the main chemical groups involved in the copper and nickel biosorption were carboxyl, ether, alcoholic, amino, and sulphonic groups.

APA, Harvard, Vancouver, ISO, and other styles

14

Irem, Samra, Ejazul Islam, Qaiser Mahmood Khan, Muhammad Anwar ul Haq, and Amer Jamal Hashmat. "Adsorption of arsenic from drinking water using natural orange waste: kinetics and fluidized bed column studies." Water Supply 17, no. 4 (February 1, 2017): 1149–59. http://dx.doi.org/10.2166/ws.2017.009.

Full text

Abstract:

The biosorption potential of orange waste (OW) was investigated using synthetic solutions of arsenic and contaminated drinking water under different parameters, e.g. biosorbent dose, initial concentrations of solution, contact time, and pH in a batch system. The optimum conditions were identified as a contact time of 30 minutes, pH 6, biosorbent dose of 1 g L−1, and initial arsenic concentration of 250 ppb. A fluidized bed column was used to study the removal of arsenic in the column. The results showed that biosorption of arsenic gave promising results in batch and continuous system, lowering the arsenic concentration down to WHO standards (10 ppb) for drinking water. The Fourier transform infrared spectra indicated that hydroxyl and carboxyl groups were major active sites for biosorption, while the results of scanning electron microscopy showed obvious changes in surface morphology of OW after the biosorption process. With 90% removal efficiency, results indicated that OW is a cost-effective and eco-friendly biosorbent and comparable to current drinking water treatment technologies. Further research is needed to get the optimum conditions for pilot-scale testing of the biosorption process by OW as well as evaluation of treated water for food quality parameters in order to commercialize the process.

APA, Harvard, Vancouver, ISO, and other styles

15

Lodeiro, Pablo, Roberto Herrero, and Manuel E. Sastre de Vicente. "Thermodynamic and Kinetic Aspects on the Biosorption of Cadmium by Low Cost Materials: A Review." Environmental Chemistry 3, no. 6 (2006): 400. http://dx.doi.org/10.1071/en06043.

Full text

Abstract:

Environmental Context. The toxicity of cadmium in waters can be decreased by using a wide variety of low-cost biomaterials. A number of such investigations are reviewed here and the models used to describe the process of biosorption discussed. Fundamental investigations that probe the thermodynamics and kinetics of the biosorption process are essential for a strong understanding of all biosorption processes. Areas that still need addressing are highlighted, in particular with regard to cadmium biosorption, some models for which are ready to be tested in pilot plants. Abstract. Cadmium is internationally recognized as an important pollutant in the environment, and different methods for its removal from wastewaters (chemical precipitation being the most commonly used) have been reported in the literature. Those methods are in most cases oriented to situations with high concentrations of the pollutant. Thus, alternative removal and recovery methods are being considered for removing very low concentrations of cadmium. These methods are all based on biosorption, the passive adsorption and sequestration of metals by several natural materials of biological origin. In this review we have considered the biosorption of cadmium onto biomaterials from a physicochemical, thermodynamic, and kinetic perspective. The thermodynamic perspective is based on the characterization of the interactions of the binding sites of the biosorbents with cadmium species in aqueous solution. Traditionally, this approach has been quantified using different kinds of isotherms. In addition, the description is completed by taking into account electrostatic effects, and the influence of pH and ionic strength, which are associated with the negative charge developed, in most cases, by the biomaterial. The other point of view in this review is the kinetic one, which is necessary for a full physicochemical description of the sorbate–biosorbent system. Consequently, an updated description of the various approaches commonly employed in kinetic studies in biosorption has been carried out.

APA, Harvard, Vancouver, ISO, and other styles

16

Lo, Yung-Chung, Chieh-Lun Cheng, Yin-Lung Han, Bor-Yann Chen, and Jo-Shu Chang. "Recovery of high-value metals from geothermal sites by biosorption and bioaccumulation." Bioresource Technology 160 (May 2014): 182–90. http://dx.doi.org/10.1016/j.biortech.2014.02.008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Yaneva, Zvezdelina Lyubenova, and Nedyalka Valkanova Georgieva. "Removal of diazo dye from the aqueous phase by biosorption onto ball-milled maize cob (BMMC) biomass of Zea mays." Macedonian Journal of Chemistry and Chemical Engineering 32, no. 1 (June 15, 2013): 133. http://dx.doi.org/10.20450/mjcce.2013.80.

Full text

Abstract:

The mechanism of Congo red (CR) biosorption by the agricultural waste material ball-milled maize cob (BMMC) biomass of Zea mays was studied by analyzing the effect of pH and biosorbent surface chemistry; the equilibrium and kinetic behavior of the sorbate/sorbent system were also investigated. Surface chemistry and morphology were characterized by potentiometric titration, pH of zero charge, FTIR analyses and digital microscopy (DM). The acidic and basic sites for the biomass were quantified as 3.68 and 5.25 mmol g–1, respectively; therefore, the surface of the biomass was basic. The analysis of dye equilibrium isotherm data was done using the Langmuir, Freundlich and Redlich–Peterson models. CR biosorption on the agricultural waste biomaterial was mainly limited by chemisorption and/or intraparticle diffusion. The studies revealed that CR removal involved electrostatic interactions between negatively charged dye SO3− groups and positively charged adsorbent surfaces, H–bonding between the oxygen- and nitrogen-containing functional groups of CR and the BMMC surface and hydrophobic–hydrophobic interactions between the dye and sorbent hydrophobic parts. The maximum biosorption capacity of Zea mays biomass (q 4.83 mg g–1) occurred at pH 7.

APA, Harvard, Vancouver, ISO, and other styles

18

Sharma, Swati, and Lalit M. Pandey. "Hydrophobic Surface Induced Biosorption and Microbial Ex Situ Remediation of Oil-Contaminated Sites." Industrial & Engineering Chemistry Research 60, no. 26 (June 25, 2021): 9378–88. http://dx.doi.org/10.1021/acs.iecr.1c00974.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Manguilimotan, Lebeth C., and Jayzon G. Bitacura. "Biosorption of Cadmium by Filamentous Fungi Isolated from Coastal Water and Sediments." Journal of Toxicology 2018 (October 22, 2018): 1–6. http://dx.doi.org/10.1155/2018/7170510.

Full text

Abstract:

The use of microorganisms in decontaminating the environment encumbered with heavy metal pollutants through biosorption is considered as a good option for bioremediation. This study was conducted to isolate Cadmium (Cd) tolerant fungi from coastal waters and sediments, compare their biosorption capabilities, and identify the isolates with the highest Cd uptake. Water and sediment samples were collected near the effluent sites of industrial belt in Ibo, Lapu-lapu City, Cebu, Philippines. Potato dextrose agar (PDA) plates containing Cd (25, 50, 75, and 100 ppm) were used to isolate Cd tolerant fungi from the samples. The distinct colonies that grew on the highest Cd concentration (100 ppm) were then isolated into pure cultures. The pure cultures of Cd tolerant fungi served as a source of inocula for in vitro biosorption assay using Cd dissolved in potato dextrose broth (PDB) as the substrate. Cd tolerant fungal isolates with the highest Cd uptake were finally identified up to the lowest possible taxon based on their colonial and microscopic characteristics. Most filamentous fungal colonies have grown most at the lower Cd concentrations and least at the higher concentrations. From the characteristics of the fungal growth on the plate with the highest Cd concentration, eight distinct colonies from both sediment and water samples were isolated into pure cultures. Among the eight fungal isolates, only three had significant Cd biosorption efficiency, these were fungal isolate 3 (13.87 %), fungal isolate 6 (11.46 %), and fungal isolate 4 (10.71 %). Two of them (fungal isolates 3 and 4) belong to genus Aspergillus while the other (fungal isolate 6) is a species of Penicillium. The results of this study showed that Cd tolerant fungi with biosorption capacity could be isolated from coastal water and sediments in the vicinity of areas suspected of heavy metal contamination.

APA, Harvard, Vancouver, ISO, and other styles

20

Dewi, Nur Kusuma, Ibnul Mubarok, and Ari Yuniastuti. "Biosorption of Heavy Metal Pollution by Enterobacter agglomerans." Biosaintifika: Journal of Biology & Biology Education 11, no. 2 (August 19, 2019): 289–95. http://dx.doi.org/10.15294/biosaintifika.v11i2.20471.

Full text

Abstract:

Biosorption is a new waste treatment technology that can eliminate toxic heavy metals. Biosorption can be considered as an environmentally friendly alternative technology to treat industrial liquid waste that is economically proper to use. One of them is biosorption that utilizes the microorganisms’ absorption ability, especially bacteria that can absorb heavy metals in waters, such as Enterobacter agglomerans. This research aimed to determine the ability of E. agglomerans in reducing heavy metals pollution in local river. The research employed the measurement of the effect of lead (Pb) to E. agglomerans growth using Optical Density (OD) at wavelength 600 nm. The colony numbers were calculated using a standard curve. While the ability of E. agglomerans to reduce heavy metals concentration in liquid media was measured using AAS with a wavelength of 240 nm. The results showed that lead affected the growth of E. agglomerans. The OD value has a negative relationship with the concentration level of Pb. The ODs were decreased from 2.867 to 1.242, using Pb level from 0 ppm to 20 ppm. Therefore, it proved that E. agglomerans could reduce heavy metals concentration in local river in Central Java Province. This research was the first report on E. agglomerans activity on heavy metal in contaminated water. This result can be used as a reference for industrial sites near the river to treat their wastewater before discharging it to the river body to preserve its water purity.

APA, Harvard, Vancouver, ISO, and other styles

21

Zhu, Tao, Lei Wang, and Fa Zhi Ge. "Equilibrium and Kinetic Studies of Aqueous Cesium(I) Ions Biosorption by Pseudomonas alcaligenes Biomass as a Low-Cost Natural Biosorbent." Advanced Materials Research 171-172 (December 2010): 53–56. http://dx.doi.org/10.4028/www.scientific.net/amr.171-172.53.

Full text

Abstract:

The Cs(I) biosorption characteristics of Pseudomonas alcaligenes biomass was examined as a function of initial pH, contact time and initial metal ion concentration. FTIR spectra showed that the principal functional sites taking part in the sorption process included carboxyl, hydroxyl groups and -CH3 stretching groups. The pseudo-second-order kinetic model was found to be well suited for the entire adsorption process of Cs(I) on Pseudomonas alcaligenes, which indicated the biosorption process operated through chemisorption mechanism. Adsorption equilibrium studies showed that Cs(I) adsorption data followed the Langmuir model, the maximum binding capacity of Cs(I) according to Langmuir isotherm were 81.05mg/g at pH 7.0 , shaker speed 150 rpm, at 27°C and for 60 min. The present study indicated that Pseudomonas alcaligenes biomass may be used as an inexpensive, effective and easily cultivable biosorbent for the removal of Cs(I) ions from environmental and industrial wastewater.

APA, Harvard, Vancouver, ISO, and other styles

22

Heilmann, Marcus, Roman Breiter, and Anna Maria Becker. "Towards rare earth element recovery from wastewaters: biosorption using phototrophic organisms." Applied Microbiology and Biotechnology 105, no. 12 (June 2021): 5229–39. http://dx.doi.org/10.1007/s00253-021-11386-9.

Full text

Abstract:

Abstract Whilst the biosorption of metal ions by phototrophic (micro)organisms has been demonstrated in earlier and more recent research, the isolation of rare earth elements (REEs) from highly dilute aqueous solutions with this type of biomass remains largely unexplored. Therefore, the selective binding abilities of two microalgae (Calothrix brevissima, Chlorella kessleri) and one moss (Physcomitrella patens) were examined using Neodym and Europium as examples. The biomass of P. patens showed the highest sorption capacities for both REEs (Nd3+: 0.74 ± 0.05 mmol*g−1; Eu3+: 0.48 ± 0.05 mmol*g−1). A comparison with the sorption of precious metals (Au3+, Pt4+) and typical metal ions contained in wastewaters (Pb2+, Fe2+, Cu2+, Ni2+), which might compete for binding sites, revealed that the sorption capacities for Au3+ (1.59 ± 0.07 mmol*g−1) and Pb2+ (0.83 ± 0.02 mmol*g−1) are even higher. Although different patterns of maximum sorption capacities for the tested metal ions were observed for the microalgae, they too showed the highest affinities for Au3+, Pb2+, and Nd3+. Nd-sorption experiments in the pH range from 1 to 6 and the recorded adsorption isotherms for this element showed that the biomass of P. patens has favourable properties as biosorbent compared to the microalgae investigated here. Whilst the cultivation mode did not influence the sorption capacities for the target elements of the two algal species, it had a great impact on the properties of the moss. Thus, further studies are necessary to develop effective biosorption processes for the recovery of REEs from alternative and so far unexploited sources. Key points • The highest binding capacity for selected REEs was registered for P. patens. • The highest biosorption was found for Au and the biomass of the examined moss. • Biosorption capacities of P. patens seem to depend on the cultivation mode.

APA, Harvard, Vancouver, ISO, and other styles

23

Flemming, Hans-Curt. "Sorption sites in biofilms." Water Science and Technology 32, no. 8 (October 1, 1995): 27–33. http://dx.doi.org/10.2166/wst.1995.0256.

Full text

Abstract:

The distribution of pollutants in water is strongly dependent on the processes at the solid-liquid interface, such as soprtion. The solid phase is represented by many different materials, mostly minerals but also metals and organics. In technical and natural water systems, biofilms occur to a greater or lesser extent. They will cover the underlying material (substratum) at least partially and represent a gel-type layer, mainly consisting of extracellular polymeric substances (EPS), formed by biofilm organisms, in which the latter are embedded. Thus, the sorption properties of biofilms will significantly determine the overall process. This effect may have been almost completely overseen, e.g., in the assessment of the fate of pollutants in waters, in the process of sediment diagenesis, and in chemical sorption studies. Sorption data can differ considerably between sterile and non-sterile assays; this aspect puts in question many results gained in biologically uncharacterized systems. Sorption in biofilms can be undesired, if pollutants accumulate in biomass such as activated sludge. The same effect, however, can be biotechnologically exploited, e.g. in biosorption reactors. Biofilms can sorb water, inorganic and organic solutes and particles. As sorption sites can serve: EPS, cell walls, cell membranes and cell cytoplasm. These sites display different sorption preferences, capacities and properties. The situation becomes even more complex as biofilms may respond physiologically to sorbed substances. For example: the uptake of toluene can lead to the formation of uronic acids in the EPS and, thus, to an increased sorption capacity for cations. When decomposing, biofilms will release sorbed substances. This can be of significance if trickling deposition of sewage water on soil is finished. The biomass will decompose, sorbed pollutants are remobilized and can contaminate the ground water if not retained abiotically by other soil components. A substantial research demand is identified regarding the following questions: (i) what do biofilms sorb; (ii) what are the binding sites; (iii) what are the sorption mechanisms and capacity, and (iv) what is the remobilization potential?

APA, Harvard, Vancouver, ISO, and other styles

24

Kang, So Young, Jong Un Lee, and Kyoung Woong Kim. "A Study of the Biosorption Characteristics of Co²⁺ in Wastewater Using Pseudomonas Aeruginosa." Key Engineering Materials 277-279 (January 2005): 418–23. http://dx.doi.org/10.4028/www.scientific.net/kem.277-279.418.

Full text

Abstract:

Pseudomonas aeruginosa biomass was used to investigate the biosorption properties of heavy metals in wastewater. The biosorption isotherm of Co2+ was best described by the Langmuir model when washed cells were employed, and results obtained utilizing heat-treated P. aeruginosa were also adequately represented by a Langmuir sorption isotherm. In contrast, the sorption isotherm involving unwashed P. aeruginosa showed a different isotherm profile and did not attain equilibrium in the range of metal concentrations investigated; the amount of Co2+ uptake increased with increasing initial metal concentration but never reached adsorption equilibrium, most likely due to bacterial production of extracellular polymeric substances (EPS). The biosorption results utilizing unwashed P. aeruginosa were best described by a Freundlich isotherm. The level of metal adsorption in low pH was significantly small due to competition between the cation and H+ ions for binding sites distributed on cell surfaces, while the increase in pH favored metal sorption because of the elevated quantities of negatively charged surface functional groups. The sorption of Co2+ was strongly influenced by the presence of competing cations in the solution. Trivalent Cr3+ added to the solution was preferentially adsorbed onto the cells relative to Co2+ and Ni2+. The results may be attributed to the higher adsorption affinity of Cr3+ in comparison to either Co2+ or Ni2+. The affinity order (Cr3+ > Co2+ » Ni2+) was maintained over a pH range up to 5.3 in a mixture solution.

APA, Harvard, Vancouver, ISO, and other styles

25

Plazinski, Wojciech, and Wladyslaw Rudziński. "Biosorption of Heavy Metal Ions: Ion-Exchange versus Adsorption and the Heterogeneity of Binding Sites." Adsorption Science & Technology 29, no. 5 (June 2011): 479–86. http://dx.doi.org/10.1260/0263-6174.29.5.479.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Oyetibo, Ganiyu Oladunjoye, Matthew Olusoji Ilori, Oluwafemi Sunday Obayori, and Olukayode Oladipo Amund. "Equilibrium studies of cadmium biosorption by presumed non-viable bacterial strains isolated from polluted sites." International Biodeterioration & Biodegradation 91 (July 2014): 37–44. http://dx.doi.org/10.1016/j.ibiod.2014.03.004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Al-Qunaibit, M. H. "Divalent Cu, Cd, and Pb Biosorption in Mixed Solvents." Bioinorganic Chemistry and Applications 2009 (2009): 1–5. http://dx.doi.org/10.1155/2009/561091.

Full text

Abstract:

Dead driedChlorella vulgariswas studied in terms of its performance in binding divalent copper, cadmium, and lead ions from their aqueous or 50% v/v methanol, ethanol, and acetone solutions. The percentage uptake of cadmium ions exhibited a general decrease with decrease in dielectric constant values, while that of copper and lead ions showed a general decrease with increase in donor numbers. Uptake percentage becomes less sensitive to solvent properties the larger the atomic radius of the biosorbed ion, and uptake of copper was the most affected. FT-IR analyses revealed stability of the biomass in mixed solvents and a shift in vibrations of amide(I) and (II), carboxylate, glucose ring, and metal oxygen upon metal binding in all media.ΔνCOOvalues (59–69 cm−1) confirmed bidentate metal coordination to carboxylate ligands. The value ofνasCOOincreased slightly upon Cu, Cd, and Pb biosorption from aqueous solutions indicating lowering of symmetry, while a general decrease was noticed in mixed solvents pointing to the opposite. M–O stretching frequencies increased unexpectedly with increase in atomic mass as a result of solvent effect on the nature of binding sites. Lowering polarity of the solvent permits variations in metal-alga bonds strengths; the smaller the metal ion, the more affected.

APA, Harvard, Vancouver, ISO, and other styles

28

Ayele, Abate, and Yakob Godebo Godeto. "Bioremediation of Chromium by Microorganisms and Its Mechanisms Related to Functional Groups." Journal of Chemistry 2021 (June 30, 2021): 1–21. http://dx.doi.org/10.1155/2021/7694157.

Full text

Abstract:

Heavy metals generated mainly through many anthropogenic processes, and some natural processes have been a great environmental challenge and continued to be the concern of many researchers and environmental scientists. This is mainly due to their highest toxicity even at a minimum concentration as they are nonbiodegradable and can persist in the aquatic and terrestrial environments for long periods. Chromium ions, especially hexavalent ions (Cr(VI)) generated through the different industrial process such as tanneries, metallurgical, petroleum, refractory, oil well drilling, electroplating, mining, textile, pulp and paper industries, are among toxic heavy metal ions, which pose toxic effects to human, plants, microorganisms, and aquatic lives. This review work is aimed at biosorption of hexavalent chromium (Cr(VI)) through microbial biomass, mainly bacteria, fungi, and microalgae, factors influencing the biosorption of chromium by microorganisms and the mechanism involved in the remediation process and the functional groups participated in the uptake of toxic Cr(VI) from contaminated environments by biosorbents. The biosorption process is relatively more advantageous over conventional remediation technique as it is rapid, economical, requires minimal preparatory steps, efficient, needs no toxic chemicals, and allows regeneration of biosorbent at the end of the process. Also, the presence of multiple functional groups in microbial cell surfaces and more active binding sites allow easy uptake and binding of a greater number of toxic heavy metal ions from polluted samples. This could be useful in creating new insights into the development and advancement of future technologies for future research on the bioremediation of toxic heavy metals at the industrial scale.

APA, Harvard, Vancouver, ISO, and other styles

29

Markai, S., Y. Andrès, G. Montavon, and B. Grambow. "Study of the interaction between europium (III) and Bacillus subtilis: fixation sites, biosorption modeling and reversibility." Journal of Colloid and Interface Science 262, no. 2 (June 2003): 351–61. http://dx.doi.org/10.1016/s0021-9797(03)00096-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Concórdio-Reis, Patrícia, Maria A. M. Reis, and Filomena Freitas. "Biosorption of Heavy Metals by the Bacterial Exopolysaccharide FucoPol." Applied Sciences 10, no. 19 (September 25, 2020): 6708. http://dx.doi.org/10.3390/app10196708.

Full text

Abstract:

Despite the efforts for minimizing the usage of heavy metals, anthropogenic activities still generate high amounts of wastewater containing these contaminants that cause significant health and environmental problems. Given the drawbacks of the conventional physical and chemical methods currently used, natural biosorbents (microbial cells or their products) arise as promising environmentally friendly alternatives. In this study, the binding efficiency of the polysaccharide secreted by Enterobacter A47, FucoPol, towards lead (Pb2+), cobalt (Co2+), copper (Cu2+) and zinc (Zn2+) cations was demonstrated. FucoPol revealed a higher performance for the biosorption of Pb2+, with a maximum overall metal removal of 93.9 ± 5.3% and a specific metal uptake of 41.1 ± 2.3 mg/gEPS, from a Pb2+ solution with an initial concentration of 10 mg/L, by a 5 g/L FucoPol solution. The overall metal removal decreased considerably (≤31.3 ± 1.6%) for higher Pb2+ concentrations (48 and 100 mg/L) probably due to the saturation of FucoPol’s binding sites. Pb2+ removal was also less efficient (66.0 ± 8.2%) when a higher FucoPol concentration (10 g/L) was tested. Pb2+ removal efficiency of FucoPol was maximized at pH 4.3, however, it was affected by lower pH values (2.5–3.3). Moreover, the FucoPol’s sorption performance was unaffected (overall metal removal: 91.6–93.9%) in the temperature range of 5–40 °C. These findings demonstrate FucoPol’s great potential for utilization as a biodegradable and safe biosorbent for treating waters and wastewaters contaminated with Pb2+.

APA, Harvard, Vancouver, ISO, and other styles

31

Yalçın, Sibel, and Mustafa Özyürek. "Biosorption potential of two brown seaweeds in the removal of chromium." Water Science and Technology 78, no. 12 (December 29, 2018): 2564–76. http://dx.doi.org/10.2166/wst.2019.007.

Full text

Abstract:

Abstract The present work focused on the potential use of brown algae Cystoseira barbata and Cystoseira crinita from the Black Sea coast for removal and speciation analyses of Cr(III,VI) ions from aqueous and wastewater solutions. The biosorption process of Cr(III) and Cr(VI) was designed as a function of pH and contact time. Potentiometric titration and Fourier transform infrared spectroscopy (FT-IR) analysis techniques revealed the potential binding sites present at the surface of the algae for both oxidation states of Cr. Various chemical treatments have been used to indicate the mechanisms of binding Cr(III,VI) and bioreduction of Cr(VI) by the biosorbents. Acidic treatment was the most successful in removing and reducing total Cr(VI). Algae samples were subjected to methylation and esterification processes for modification of amino and carboxyl groups, respectively. The Langmuir model was applied to describe the biosorption of Cr(III,VI) by algae. Total Cr and Cr(VI) determinations were simultaneously made using the diphenyl carbazide spectrophotometric method and flame atomic absorption spectroscopy (FAAS). In conclusion, these algae can be used as a potentially cost-effective biosorbent for the uptake of two different oxidation states of Cr and subsequently for Cr speciation analysis.

APA, Harvard, Vancouver, ISO, and other styles

32

Y. Tohamy, Eman, Azza A. Abou-Zeid, M. M. . Hazaa, and Reham A. Hassan. "HEAVY METAL BIOSORPTION BY SOME BACTERIAL SPECIES ISOLATED FROM DRINKING WATER AT DIFFERENT SITES IN SHARQIA GOVERNORATE." Arab Universities Journal of Agricultural Sciences 14, no. 1 (March 1, 2006): 147–72. http://dx.doi.org/10.21608/ajs.2006.15365.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Pagnanelli, Francesca, Nohman Jbari, Franco Trabucco, Ma Eugenia Martínez, Sebastián Sánchez, and Luigi Toro. "Biosorption-mediated reduction of Cr(VI) using heterotrophically-grown Chlorella vulgaris: Active sites and ionic strength effect." Chemical Engineering Journal 231 (September 2013): 94–102. http://dx.doi.org/10.1016/j.cej.2013.07.013.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Chu, K. H., M. A. Hashim, S. M. Phang, and V. B. Samuel. "Biosorption of cadmium by algal biomass: adsorption and desorption characteristics." Water Science and Technology 35, no. 7 (April 1, 1997): 115–22. http://dx.doi.org/10.2166/wst.1997.0267.

Full text

Abstract:

The adsorption and desorption characteristics of a biosorption process comprising the biomass of the marine alga Sargassum baccularia, cadmium ions and desorbing agents hydrochloric acid and ethylenediaminetetraacetic acid (EDTA) were investigated using a batch reactor system. Both desorbents were effective in stripping adsorbed cadmium from the biomass. It was found that HCl at pH 2 could desorb 80% of the cadmium initially loaded onto the biomass. Almost complete recovery of cadmium was achieved by a 3.24 mM EDTA solution. The reusability of the biomass was tested in five consecutive adsorption-desorption cycles. The quantity of cadmium desorbed over the five cycles with either HCl or EDTA as desorbent corresponded well to the quantity loaded, indicating that complete desorption was readily achieved. However, the cadmium uptake capacity of the biomass deteriorated with repeated use of HCl or EDTA. HCl was found to have reduced cadmium uptake by 56% while the reduction for EDTA was nearly 40% over the five adsorption-desorption cycles. EDTA thus emerged as a slightly better desorbing agent compared with HCl. After completion of the five cycles it was found that 30% of the original biomass weight had been lost with HCl as the desorbent. EDTA exhibited desorption behaviour similar to that of HCl by causing a biomass loss of 16%. The loss of biomass indicates that some dissolution of biomass components containing cadmium binding sites apparently occurred, reducing the cadmium uptake capacity of the biomass in multiple cycles of adsorption-desorption.

APA, Harvard, Vancouver, ISO, and other styles

35

Lei, A. P., Y. S. Wong, and N. F. Y. Tam. "Removal of pyrene by different microalgal species." Water Science and Technology 46, no. 11-12 (December 1, 2002): 195–201. http://dx.doi.org/10.2166/wst.2002.0738.

Full text

Abstract:

The efficiency of seven microalgal species, namely, Chlamydomonas sp., Chlorella miniata, Chlorella vulgaris, Scenedesmus platydiscus, Scenedesmus quadricauda, Selenastrum capricornutum, and Synechosystis sp. to remove pyrene from solution varied from species to species. According to the 6-hour, 12-hour, and 7-day exposure data, S. capricornutum was the most efficient species in the removal of pyrene, followed by S. platydiscus (a local isolate), and the least effective species was C. vulgaris. For all species, the removal was very rapid in the first 3 to 6 hours of treatment, and no significant difference was found between live and dead cells of C. miniata, C. vulgaris and S. capricornutum, indicating that the initial removal was due to passive physico-chemical biosorption. More than 65% of the pyrene adsorbed was bound on cell wall materials of S. capricornutum, suggesting the major binding sites were on cell walls. The pyrene removal was also dependent on the concentration of algal biomass used, the more the biomass the higher the removal percentages. In addition to biosorption, pyrene was accumulated and transformed inside live cells. In 7-day S. capricornutum culture, pyrene was not detected in either culture medium or algal pellets, and pyrene might have been completely transformed by this species. The degree of bioaccumulation and biotransformation was species specific.

APA, Harvard, Vancouver, ISO, and other styles

36

Mao, Yan Li, Shui Cheng Tan, Yao Qing Wang, Tian Hai Wang, and Kui Zhang. "Studies on Biosorption Equilibrium and Kinetics of Ni(II) by Pseudomonas Fluorescens." Advanced Materials Research 113-116 (June 2010): 1828–32. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.1828.

Full text

Abstract:

The Ni(II) biosorption characteristics of Pseudomonas fluorescens biomass was examined as a function of initial pH, contact time and initial metal ion concentration. The pseudo-second-order kinetic model was found to be well suited for the entire adsorption process of Ni(II) on biomass. Adsorption equilibrium studies showed that Ni(II) adsorption data followed the Langmuir model, the maximum binding capacity of Ni(II) was 84.45 mg/g at pH 7.0 , shaker speed 150 rpm, at 27 °C. FTIR spectra showed that the principal functional sites taking part in the sorption process included carboxyl , hydroxyl groups and -CH3 stretching groups, the mechanism analysis showed that the chemical chelating was the main adsorption form, electrostatic attraction hydrogen bonding in the process of adsorption. The present study indicated that Pseudomonas fluorescens biomass may be used as an inexpensive, effective and easily cultivable biosorbent for the removal of Ni(II) ions from environmental and industrial wastewater.

APA, Harvard, Vancouver, ISO, and other styles

37

Hetzer, Adrian, Christopher J. Daughney, and Hugh W. Morgan. "Cadmium Ion Biosorption by the Thermophilic Bacteria Geobacillus stearothermophilus and G. thermocatenulatus." Applied and Environmental Microbiology 72, no. 6 (June 2006): 4020–27. http://dx.doi.org/10.1128/aem.00295-06.

Full text

Abstract:

ABSTRACT This study reports surface complexation models (SCMs) for quantifying metal ion adsorption by thermophilic microorganisms. In initial cadmium ion toxicity tests, members of the genus Geobacillus displayed the highest tolerance to CdCl2 (as high as 400 to 3,200 μM). The thermophilic, gram-positive bacteria Geobacillus stearothermophilus and G. thermocatenulatus were selected for further electrophoretic mobility, potentiometric titration, and Cd2+ adsorption experiments to characterize Cd2+ complexation by functional groups within and on the cell wall. Distinct one-site SCMs described the extent of cadmium ion adsorption by both studied Geobacillus sp. strains over a range of pH values and metal/bacteria concentration ratios. The results indicate that a functional group with a deprotonation constant pK value of approximately 3.8 accounts for 66% and 80% of all titratable sites for G. thermocatenulatus and G. stearothermophilus, respectively, and is dominant in Cd2+ adsorption reactions. The results suggest a different type of functional group may be involved in cadmium biosorption for both thermophilic strains investigated here, compared to previous reports for mesophilic bacteria.

APA, Harvard, Vancouver, ISO, and other styles

38

Alam, Jahangir, and Mohammad Nasir Uddin. "Kinetic and equilibrium studies of adsorption of Pb(II) on low cost agri-waste adsorbent Jute Stick Powder." European Journal of Chemistry 10, no. 4 (December 31, 2019): 295–304. http://dx.doi.org/10.5155/eurjchem.10.4.295-304.1886.

Full text

Abstract:

A lingo-cellulosic material Jute Stick Powder was used as a biosorbent to remove Pb(II) ions from aqueous solution and the biosorption behavior was investigated as a function of pH, metal ion concentration, adsorbent dosages and agitation time. Sorption binding sites present in JSP was assessed by Infrared spectroscopy (IR) and Scanning Electron Micrograph (SEM). The determined experimental data were fitted to some common kinetic and equilibrium models. Langmuir isotherm and pseudo-second-order kinetic model gave better fit to experimental data. The study revealed that spontaneous ion-exchange and complexation process involved in the adsorption mechanism. When the repeated adsorption-desorption cycles were performed, JSP kept its adsorptive efficiency even after three cycles of reuse.

APA, Harvard, Vancouver, ISO, and other styles

39

Singh, Tej Pratap, and Majumder Cb. "A COMPARISON BETWEEN BIOSORPTION AND BIOACCUMULATION OF FLUORIDE FROM WASTE WATER." Asian Journal of Pharmaceutical and Clinical Research 11, no. 3 (March 1, 2018): 92. http://dx.doi.org/10.22159/ajpcr.2018.v11i3.16604.

Full text

Abstract:

Objective: The comparison between the properties of two removal methods viz. adsorptive removal (biosorption) and simultaneous adsorption and bioaccumulation (SAB) of fluoride from waste water was investigated.Methods: In the present study, bioaccumulation study was done on Sweet Lemon peel. Acinetobacter baumannii (Mtcc no-11451) is a water living microorganism which survives in waste water. Microorganism (Acinetobacter baumannii (Mtcc no-11451)) immobilized on the surface of Sweet Lemon peel. The size of microorganism is greater than the pore size of adsorbent. Active sites of the adsorbent are blocked due to immobilization of microorganism on the surface of adsorbent. Different optimizing parameters are studied during the experiments like adsorbent dose, pH, initial concentration and contact time for bio bioaccumulation process.Results: It was observed that adsorption and bioaccumulation process execute simultaneously but mainly bioaccumulation is responsible for removal of fluoride. The removal efficiency of fluoride sees a drastic increase from 59.59 % to 99.49 % in optimum conditions. It is to be noted that simple adsorption process removal efficiency was 95.795 % at optimum time (60 min), pH 4.0 and dose 10 g/l. Adsorption isotherm parameters are well fitted for Freundlich whereas simple adsorption follow Langmuir isotherm model.Conclusion: The removal of fluoride occurred due to the accumulation by bacteria. Kinetic result revealed that bioaccumulation is a slower process. Bioaccumulation process increase the removal efficiency but it is very time consuming and costly as compare to the simple adsorption process.

APA, Harvard, Vancouver, ISO, and other styles

40

Bakatula, E. N., E. M. Cukrowska, I. M. Weiersbye, L. Mihaly-Cozmuta, A. Peter, and H. Tutu. "Biosorption of trace elements from aqueous systems in gold mining sites by the filamentous green algae (Oedogonium sp.)." Journal of Geochemical Exploration 144 (September 2014): 492–503. http://dx.doi.org/10.1016/j.gexplo.2014.02.017.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Qie, Li-Mei, Zeng-Yu Yao, Guo-Wei Li, Sang-Bin Xie, Qi Yang, and Jian-Hua Qi. "Equilibrium, kinetics and thermodynamics of Cu(II) biosorption on Chinese chestnut shell pretreated with steam explosion." Water Science and Technology 78, no. 4 (August 20, 2018): 868–77. http://dx.doi.org/10.2166/wst.2018.359.

Full text

Abstract:

Abstract The shells of Chinese chestnuts (Castanea mollissima) are an agricultural residue. This work aimed to evaluate this feasibility of using steam explosion to modify this residue for Cu(II) biosorption from aqueous solutions. Equilibrium, kinetic and thermodynamic parameters were evaluated. The steam-explosion pretreatment increased the surface area of the chestnut shell and exposed more hydroxyl and carboxyl groups, which are binding sites for Cu(II). It changed the sorption from a spontaneous process driven by enthalpy to a nonspontaneous one driven by entropy. It increased the Cu(II) sorption capacity at higher temperatures while it decreased the capacity at lower ones. Compared with untreated chestnut shell, the steam-exploded shell is preferable for Cu(II) sorption at higher temperatures.

APA, Harvard, Vancouver, ISO, and other styles

42

Tejada-Tovar, Candelaria, Angel Villabona-Ortíz, and Rodrigo Ortega-Toro. "Determination of Kinetic Parameters in the Biosorption of Chromium (VI) in Aqueous Solution." Ingeniería y Ciencia 16, no. 31 (June 19, 2020): 129–43. http://dx.doi.org/10.17230/ingciencia.16.31.6.

Full text

Abstract:

he contamination of aquatic bodies by heavy metals is a growing environmental problem, making more critical the study and development of new technologies and materials that can be used for the removal of this type of pollutants. Thus, adsorption arises using residual materials as a sustainable alternative for the solution to this problem. In the present study, the use of plantain peels in the adsorption of Cr (VI) in a batch system is proposed, establishing the kinetics of the process at different temperature conditions, particle size and amount of adsorbent. The fit of the data was done using the theoretical models of pseudo-first-order, pseudo-second-order and Elovich. From the data, it is established that the pseudo-second-order and Elovich models show a better adjustment, so that the adsorption in the material occurs on two adsorption sites and that such process is related to chemical adsorption. The maximum adsorption capacity of Cr (VI) was found at a condition of 0.0306 g, 0.6775 mm and 55°C at a time of 420 min establishing the efficient use of plantain peels for the removal of the ion metallic in the studio.

APA, Harvard, Vancouver, ISO, and other styles

43

Komy, Zanaty R., Rabei M. Gabar, Ahmed A. Shoriet, and Rehab M. Mohammed. "Characterisation of acidic sites of Pseudomonas biomass capable of binding protons and cadmium and removal of cadmium via biosorption." World Journal of Microbiology and Biotechnology 22, no. 9 (March 23, 2006): 975–82. http://dx.doi.org/10.1007/s11274-006-9143-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Madhuranthakam, Chandra Mouli R., Archana Thomas, Zhainab Akhter, Shannon Q. Fernandes, and Ali Elkamel. "Removal of Chromium(VI) from Contaminated Water Using Untreated Moringa Leaves as Biosorbent." Pollutants 1, no. 1 (February 25, 2021): 51–64. http://dx.doi.org/10.3390/pollutants1010005.

Full text

Abstract:

Biosorption of chromium (Cr(VI)) is studied by using raw (chemically not modified) Moringa (Moringa Oleifera) leaf powder without any pretreatment. Cr(VI) is one of the potentially harmful heavy metals found in industrial wastewater. In the Moringa leaf powder, the presence of a significant amount of organic acids form the source for the biosorption of Cr(VI). The concentration of Cr(VI) in the feed solution is varied and different dosages of the proposed biosorbent are used to study its efficiency in the removal of Cr(VI). The concentration of Cr(VI) is varied from 1 ppm to 20 ppm while the amount of biosorbent is varied from 0.5 g to 2.5 g. The equilibrium time for adsorption of Cr(VI) is observed to vary between half an hour and 90 min. The metal removal efficiency varied from 30% to 90% which is a significant achievement compared to other conventional methods which are either energy-intensive or not cost effective. The experimental results are modeled using Langmuir, Freundlich and Redlich–Peterson isotherms. The metal removal efficiency is attributed to the chelating effect of carboxylate and hydroxyl groups present in the moringa leaves and is confirmed from the FTIR analysis. Further molecular docking simulations are performed to confirm the binding of the metal to the speculated sites within the different acids present in the moringa leaves. Untreated green moringa leaf powder used as a biosorbent in this study leads to a sustainable and cheaper option for treating wastewater containing Cr(VI).

APA, Harvard, Vancouver, ISO, and other styles

45

Vilar, Vítor J. P., José A. B. Valle, Amit Bhatnagar, João C. Santos, Selene M. A. Guelli U. de Souza, Antônio Augusto U. de Souza, Cidália M. S. Botelho, and Rui A. R. Boaventura. "Insights into trivalent chromium biosorption onto protonated brown algae Pelvetia canaliculata: Distribution of chromium ionic species on the binding sites." Chemical Engineering Journal 200-202 (August 2012): 140–48. http://dx.doi.org/10.1016/j.cej.2012.06.023.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Chen, Xinggang, Zhuang Tian, Haina Cheng, Gang Xu, and Hongbo Zhou. "Adsorption process and mechanism of heavy metal ions by different components of cells, using yeast (Pichia pastoris) and Cu2+ as biosorption models." RSC Advances 11, no. 28 (2021): 17080–91. http://dx.doi.org/10.1039/d0ra09744f.

Full text

Abstract:

The Cu²⁺ first bound to the outer mannan and finally entered the cytoplasm. During the whole adsorption process, the number of adsorption sites in the outer and middle cell walls was the largest, and then gradually decreased.

APA, Harvard, Vancouver, ISO, and other styles

47

Male, Yusthinus T., Cecillia Anna Seumahu, and Dominggus Malle. "Bioremediation of Pb and Cd Metal from Inner Ambon Bay Sediment Which Contaminated With Heavy Metal Using Aspergillus niger." Indo. J. Chem. Res. 7, no. 2 (February 1, 2020): 183–88. http://dx.doi.org/10.30598//ijcr.2020.7-yus.

Full text

Abstract:

Bioremediation is a method that use microorganism to extract heavy metal from contaminated waste. In this research Aspergillus niger was used to extract heavy metal such as Pb and Cd of marine sediment from Waiheru shore, Inner part of Ambon Bay, which was detected as significantly high heavy metal contaminated site among seven sites. Bioremediation were done using Aspergillus nigers to extract Pb and Cd metal from sediment, then their solubility being measured in filtrate media. Result shows that Cd metal were only detected 15 days after incubation while Pb were detected since the first day incubation. This result also showing the fluctuating solubility of Pb metal. It is suspected that this occurs due to biosorption ability of the fungi that being used which triggers metal accumulation in the cell structure. It is therefore can be concluded that Aspergillus niger can be used in bioremediation of sediment that are being contaminated by Pb and Cd heavy metals.

APA, Harvard, Vancouver, ISO, and other styles

48

Fazal, Aliya, and Uzaira Rafique. "Mechanistic study of Cd adsorption through esterification and acetylation of novel biosorbent Gallus Domesticus chemically modified biomaterial for heavy metal." Journal of Water Reuse and Desalination 4, no. 2 (December 16, 2013): 76–84. http://dx.doi.org/10.2166/wrd.2013.033.

Full text

Abstract:

The inevitable expansion of industries for development is at the cost of release of industrial pollutants into the natural reservoirs of the environment. Biosorption is becoming an important component in the integrated approach to the treatment of aqueous effluents. The adsorption properties of Gallus Domesticus are determined as a function of batch operating conditions including contact time, solution initial concentration and temperature. Metal ion fixed Fourier transform infrared spectroscopy spectrum depicted amine, alcohol, carboxyl, and carbonate ion as active sites for metal sorption. Augmentation of removal capacity to 5 and 17% is tailored by esterification and acetylation of different surface functional groups of the base matrix. Kinetics is dissected through diffusion-based kinetic models, and best fit was figured out for Elovich equation. The thermodynamic relationship draws that enthalpy (ΔH° 45.48 KJ/mol) and entropy (ΔS° 153.32 J/mol K) are positive and entropy of the system is much larger than enthalpy. Results propose alteration of domestic waste into economical adsorbent for commercialization with no processing in the efficient removal of cadmium from wastewater.

APA, Harvard, Vancouver, ISO, and other styles

49

Presentato, Alessandro, Elena Piacenza, Raymond J. Turner, Davide Zannoni, and Martina Cappelletti. "Processing of Metals and Metalloids by Actinobacteria: Cell Resistance Mechanisms and Synthesis of Metal(loid)-Based Nanostructures." Microorganisms 8, no. 12 (December 18, 2020): 2027. http://dx.doi.org/10.3390/microorganisms8122027.

Full text

Abstract:

Metal(loid)s have a dual biological role as micronutrients and stress agents. A few geochemical and natural processes can cause their release in the environment, although most metal-contaminated sites derive from anthropogenic activities. Actinobacteria include high GC bacteria that inhabit a wide range of terrestrial and aquatic ecological niches, where they play essential roles in recycling or transforming organic and inorganic substances. The metal(loid) tolerance and/or resistance of several members of this phylum rely on mechanisms such as biosorption and extracellular sequestration by siderophores and extracellular polymeric substances (EPS), bioaccumulation, biotransformation, and metal efflux processes, which overall contribute to maintaining metal homeostasis. Considering the bioprocessing potential of metal(loid)s by Actinobacteria, the development of bioremediation strategies to reclaim metal-contaminated environments has gained scientific and economic interests. Moreover, the ability of Actinobacteria to produce nanoscale materials with intriguing physical-chemical and biological properties emphasizes the technological value of these biotic approaches. Given these premises, this review summarizes the strategies used by Actinobacteria to cope with metal(loid) toxicity and their undoubted role in bioremediation and bionanotechnology fields.

APA, Harvard, Vancouver, ISO, and other styles

50

D’Acunto, Berardino, Luigi Frunzo, Vincenzo Luongo, and Maria Rosaria Mattei. "Modeling Heavy Metal Sorption and Interaction in a Multispecies Biofilm." Mathematics 7, no. 9 (August 24, 2019): 781. http://dx.doi.org/10.3390/math7090781.

Full text

Abstract:

A mathematical model able to simulate the physical, chemical and biological interactions prevailing in multispecies biofilms in the presence of a toxic heavy metal is presented. The free boundary value problem related to biofilm growth and evolution is governed by a nonlinear ordinary differential equation. The problem requires the integration of a system of nonlinear hyperbolic partial differential equations describing the biofilm components evolution, and a systems of semilinear parabolic partial differential equations accounting for substrates diffusion and reaction within the biofilm. In addition, a semilinear parabolic partial differential equation is introduced to describe heavy metal diffusion and sorption. The biosoption process modeling is completed by the definition and integration of other two systems of nonlinear hyperbolic partial differential equations describing the free and occupied binding sites evolution, respectively. Numerical simulations of the heterotrophic-autotrophic interaction occurring in biofilm reactors devoted to wastewater treatment are presented. The high biosorption ability of bacteria living in a mature biofilm is highlighted, as well as the toxicity effect of heavy metals on autotrophic bacteria, whose growth directly affects the nitrification performance of bioreactors.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Biosorption sites'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles