To see the other types of publications on this topic, follow the link: Adsorption, copper.
Journal articles on the topic 'Adsorption, copper'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Adsorption, copper.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Sabadash, Vira, Oksana Mylanyk, Oksana Matsuska, and Jaroslaw Gumnitsky. "Kinetic regularities of copper ions adsorption by natural zeolite." Chemistry & Chemical Technology 11, no. 4 (2017): 459–62. http://dx.doi.org/10.23939/chcht11.04.459.
Full text
2
Jordão, Cláudio Pereira, César Reis, Carlos Roberto Bellato, Gulab Newandram Jham, and José Luis Pereira. "Adsorption of Cu2+ ions on humic acids." Rem: Revista Escola de Minas 54, no. 2 (2001): 109–14. http://dx.doi.org/10.1590/s0370-44672001000200006.
Full textAbstract:
Commercial samples of humic acids (Fluka AG) were used to evaluate the adsorption behaviour of Cu2+ ions. The mathematical model described by Langmuir's adsorption equation was applied and the values of the maximum adsorption capacity b and those of the constant related to the bonding energy a were obtained. Aliquots of copper nitrate solutions with different copper concentrations were added to the humic acid suspensions at constant pH values (4.0 and 5.0). The Langmuir isotherms presented two distinct adsorption regions, showing that the adsorptive phenomenon occurs in two distinct steps according to the copper-humic site interaction. Samples of humic acids showed higher maximum adsorption capacity at pH 5 than at pH 4, while the constant a related to bonding energy was higher at pH 4.
3
Xie, Baoshan, Yi Hou, and Youming Li. "Modified lignin nanosphere adsorbent for lead and copper ions." BioResources 16, no. 1 (2020): 249–62. http://dx.doi.org/10.15376/biores.16.1.249-262.
Full textAbstract:
Heavy metal ions in wastewater have negative effects on humans and the environment. In this paper, the adsorption of lead and copper ions by modified eucalyptus lignin nanosphere (ECLNPs) was studied. The spherical alkali-lignin particles had a diameter of 50 nm, abundant carboxyl groups of 0.66 mmol/g, and relatively high adsorption performance. The equilibrium adsorption capacities of Pb(II) and Cu(II) by ECLNPs were 126.0 mg/g and 54.4 mg/g, respectively. Both Pb(II) and Cu(II) adsorptive processes fitted a pseudo-second-order kinetics model. In the simultaneous adsorption process of Pb(II) and Cu(II), ECLNPs had higher adsorptive selectivity for Pb(II) than Cu(II), and there was a competitive adsorption process between Pb(II) and Cu(II). This resulted from the lower hydration heat of Pb(II) in water, which leads to easier separation from water ligands. ECLNPs also showed good recyclability, with 16.6% and 21.1% loss in Pb(II) and Cu(II) adsorption capacity, respectively, after three consecutive adsorption-desorption cycles, which provides a feasible technical direction for the utilization of biomass resources and the treatment of water contamination.
4
Wu, Zeng Ling, Wei Zhang Kong, Jin Yan Liu, Zhi Wu, Shui Ping Zhong, and Yong Guan Zhu. "Adsorption Kinetics and Surface Characterization of Microorganisms Grown under Different Conditions." Advanced Materials Research 1130 (November 2015): 519–23. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.519.
Full textAbstract:
The adsorption of bacteria onto minerals is the premise for bioleaching and plays an important role in minerals oxidation. Understanding of the adsorption kinetics onto the surface will give information on the effectiveness of bioleaching. Three kinds of mixed bacteria (Acidithiobacillus ferrooxidans, Leptospirillum ferrooxidans, Sulfobacillus) were cultured in different substrates - copper concentrate, elemental sulfur and ferrous iron and adsorbed onto different solid surface of elemental sulfur, silica and copper concentrate. Adsorption kinetics was examined and surface properties were investigated by Zeta-potential and FT-IR spectroscopy. Bacterial adsorption equilibrium data for bacteria grown on three different substrates were well fitted to Freundlich isotherms, indicating inhomogeneous and selective adsorption. Microorganisms grown on copper concentrate and S0 showed similar adsorption kinetics whereby cell adsorptions proceeded rapidly and reached equilibrium within 30 mins of interaction. With the average KF value of 46.2, most copper concentrate-grown cells were strongly adsorbed to three solid surfaces. Microorganisms grown on copper concentrate and S0 also showed higher hydrophobicity and higher isoelectric point (IEP) (pH 3.4-3.8) as compared to the soluble Fe2+-grown cells (pH 2.1), indicating higher amount of EPS and proteins on the surfaces. The FT-IR spectra indicated the presence of COOH, NH2, OH and PO4 groups on all cell surfaces. However, more proteinaceous compounds were found on cells grown on copper concentrate and S0 substrates.
5
Lipovský, Marek, Maroš Sirotiak, and Maroš Soldán. "Removal Of Copper From Aqueous Solutions By Using Natural And Fe-Modified Clinoptilolite." Research Papers Faculty of Materials Science and Technology Slovak University of Technology 23, no. 36 (2015): 33–40. http://dx.doi.org/10.1515/rput-2015-0004.
Full textAbstract:
Abstract Removal of copper from aqueous solution on the natural and modified clinoptilolite was studied under static conditions. Batch adsorptions of copper were performed to investigate the effects of contact time and initial metal ion concentration. The Freundlich and Langmuir adsorption isotherms were used to analyse the experimental data. The kinetic analyses of the adsorption processes were performed using the pseudo-first-order and pseudo-second-order kinetic models.
6
Liu, Li Bo, Li Zhang, and Wei Ming Gong. "Study on the Copper Ion Removal from Water by Adsorption." Advanced Materials Research 1010-1012 (August 2014): 876–79. http://dx.doi.org/10.4028/www.scientific.net/amr.1010-1012.876.
Full textAbstract:
The feasibility of using oyster shell powder for the removal of Cu2+ from aqueous solutions was investigated employing an adsorption technique. Oyster shell powder with different size was prepared. Its adsorption property to copper ions was studied. It was found that in an aqueous medium of pH 7.0, the adsorptive capacity of copper ions increased gradually with the increase of adsorption time, the addition amount of oyster shell powder and decrease of particle size. Compared with other treatment methods, this method has advantages of simple process, low cost, good treatment effect, it has a good application prospect.
7
Guo, Jun Jing, and Wen Bin Chen. "The Adsorption of Copper Ions by Sodium Alginate Immobilized Bacillus Subtilis Body and Purify Copper of Mine Wastewater." Advanced Materials Research 356-360 (October 2011): 1469–74. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.1469.
Full textAbstract:
In this study, calcium alginate immobilized bacillus subtilis body was used as an adsorbent for the aim of adsorpting Cu(Ⅱ) ions form the aqueous solutions, On sutiable condition, this study use purely bacteria eliminate other bacteria come in life-form bacteria .Through the orthogonal experiment obtains the optimum condition of sodium alginate fossilization bacillus subtilus pellet to the Cu(Ⅱ) adsorption, The biosorption efficiency was strongly influenced by the pH and the initial concentration ofthe Cu(Ⅱ) aqueous solutions. We also discusses the influence of single factor to the sodium alginate fossilization bacillus subtilus pellet to the Cu(Ⅱ) adsorption ,which included pH, contact time, temperature, initial metal ion concentrations and ionic strength in the adsorption process. The adsorption of the adsorbent on Cu(Ⅱ) is related to its concentration . From the research,we know the maximum adsorption rate to the Cu(Ⅱ) is about 83.2%. Using different model to analyse data. The sorption process follows pseudo-second-order kinetics very well,and the correlation coefficients R all reached to 0.9, and the rate constant of this kinetics model for the adsorption processes, k2, increased with the increasing temperatures. The isothermal data could be well described by the Langmuir adsorption isothermal equations．The experimental results showed that heavy metals could be eficciently accumulated by the immobilized bacteria.
8
Chen, Lu, Qi Gong, Xiao Ling Wei, and Qian Hou. "Analysis of Iron in Copper, Copper Oxide and Copper Nitrate by Solid-Phase Extraction ICP-AES Method." Advanced Materials Research 396-398 (November 2011): 238–40. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.238.
Full textAbstract:
The reasearch shows that when the mass ratio of copper to iron is equal or greater than 100, the influence of copper on the determination of trace iron can not be ignored. To eliminate the interference, the polypropylene radical strong base anion ion exchange fiber was taken as the solid phase extraction solvent. Extraction and separation of trace iron (Ⅲ) from solution copper (Ⅱ) by the extraction solvent was studied. The extraction conditions including of adsorption and elution were optimized. The strong base anion ion exchange fiber was put into the analysis solution with the medium of 6mol/L HCl. After adsorption 1h by vibration on the oscillator, adsorptive iron(Ⅲ) was eluted with the 1mol/L HCl. The concentration of iron (Ⅲ) in the eluate solution was mesured by inductively coupled plasma atomic emission spectrometry (ICP-AES). The results showed that the residual Cu (Ⅱ) in the eluate solution did not affected the accurate determination of iron. The iron in metal copper, copper oxide and copper nitrate were separated and determinated, and the RSDs(n=3) were between 2.3% and 4.2%, the recoveries were between 96% and 103%, the detection limit of the method was 0.011μg/mL.
9
Silveira, Maria Lucia Azevedo, and Luís Reynaldo Ferracciú Alleoni. "Copper adsorption in tropical oxisols." Brazilian Archives of Biology and Technology 46, no. 4 (2003): 529–36. http://dx.doi.org/10.1590/s1516-89132003000400006.
Full textAbstract:
Cu adsorption, at concentrations between 0 to 800 mg L-1, was evaluated in surface and subsurface samples of three Brazilian soils: a heavy clayey-textured Rhodic Hapludalf (RH), a heavy clayey-textured Anionic ''Rhodic'' Acrudox (RA) and a medium-textured Anionic ''Xanthic'' Acrudox (XA). After adsorption, two consecutive extractions were performed to the samples which received 100 mg L-1 copper. Surface samples adsorbed higher amounts of Cu than the subsurface, and exhibited lower Cu removed after the extractions, reinforcing the influence of the organic matter in the reactions. Cu adsorption was significant in the subsurface horizons of the Oxisols, despite the positive balance of charge, demonstrating the existence of mechanisms for specific adsorption, mainly related to the predominance of iron and aluminum oxides in the mineral fractions. In these samples, Cu was easily removed from the adsorption sites. RH demonstrated a higher capacity for the Cu adsorption in both horizons.
10
Wong, K. S., K. H. Wong, S. Ng, W. K. Chung, and P. K. Wong. "Adsorption of copper ion on magnetite-immobilised chitin." Water Science and Technology 56, no. 7 (2007): 135–43. http://dx.doi.org/10.2166/wst.2007.672.
Full textAbstract:
The adsorption of Cu2 + from aqueous solution by magnetite-immobilised chitin (MC) was studied in batch mode. Two conventional adsorbents, cation exchange resin (CER) and activated carbon (AC) were used for the comparison. The physicochemical parameters including pH, concentration of adsorbent, temperature and initial Cu2 + concentration were optimised. Under the optimised conditions, the removal efficiencies of Cu2 + for MC, CER and AC were 91.67, 93.36 and 89.16%, respectively. In addition, the removal capacities of Cu2 + for MC, CER and AC were 56.71, 74.84 and 6.55 mg/g, respectively. The adsorption isotherm studies indicated that the adsorptive behaviour of Cu2 + on three adsorbents could be well described by the Langmuir model. The maximum adsorption capacities (qmax) for MC, CER and AC were 53.19, 89.29 and 5.82 mg/g, respectively. The applicability of the kinetic model has been investigated for MC. Experimental results indicated that a pseudo-second-order reaction model provided the best description of the data with a correlation coefficient 0.999 for different initial Cu2 + concentrations. The rate constants were also determined. Various thermodynamic parameters such as standard free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) were calculated for predicting the adsorption nature of MC. The results indicated that this system was a spontaneous and endothermic process.
11
Nikolaeva, L. A., and A. A. Adzhigitova. "Purification of Industrial Waste Water from Copper Ions Using Ash Waste." Voprosy sovremennoj nauki i praktiki. Universitet imeni V.I. Vernadskogo, no. 1(79) (2021): 060–68. http://dx.doi.org/10.17277/voprosy.2021.01.pp.060-068.
Full textAbstract:
The necessity of studying organic waste as a secondary energy resource for a waste-heat boiler with further use of the resulting ash for the adsorption of heavy metal ions is shown. The adsorptive purification of waste water from copper ions by ash of organic waste is considered. The chemical composition and technological characteristics of organic biomass, the characteristics of the boiler and the toxicity of the resulting ash have been determined. The chemical composition of the ash was obtained. The isotherm of adsorption in static conditions and the output curve of adsorption in dynamic conditions of copper cations by ash of organic waste were constructed. The process of wastewater treatment of galvanic production is presented. It is concluded that the use of the adsorption method allows for a high degree of wastewater purification and its possible reuse for the technological needs of the enterprise.
12
Scendo, M., and J. Uznanska. "Inhibition Effect of 1-Butyl-4-Methylpyridinium Tetrafluoroborate on the Corrosion of Copper in Phosphate Solutions." International Journal of Corrosion 2011 (2011): 1–12. http://dx.doi.org/10.1155/2011/761418.
Full textAbstract:
The influence of the concentration of 1-Butyl-4-methylpyridinium tetrafluoroborate (4MBPBF4) as ionic liquid (IL) on the corrosion of copper in 0.5 M solutions of pH 2 and 4 was studied. The research involved electrochemical polarization method, and scanning electron microscopy (SEM) technique. The results obtained showed that the inhibition efficiency of corrosion of copper increases with an increase in the concentration of 4MBPBF4but decreases with increasing temperature. The thermodynamic functions of corrosion analysis and adsorptive behavior of 4MBPBF4were carried out. During the test, the adsorption of the inhibitor on the copper surface in the phosphate solutions was found to obey the Langmuir adsorption isotherm and had a physical mechanism.
13
Anokye, Obed Osei, and Chun Lei Zhang. "Competitive Adsorption of Lead and Copper by Kaolin." Advanced Materials Research 1073-1076 (December 2014): 784–90. http://dx.doi.org/10.4028/www.scientific.net/amr.1073-1076.784.
Full textAbstract:
Due to the potential of kaolin as an adsorbent for removal of heavy metals from solution, the competitive adsorption of Lead (Pb) and Copper (Cu) by kaolin was investigated to provide further understanding on the binding behaviors and capacities of these two metals onto kaolin. The Langmuir and Freundlich isotherms were applied to further explain the competition between the metals. Three different solutions were used, each at concentrations 10, 20, 30, 45, 60 and 75mg/L: single-metal solution of Pb (Pb-Only), single-metal solution of Cu (Cu-Only), and solution of both metals at the same concentrations (Binary solution). The kaolin adsorbed Pb about twice more than Cu, both for the binary solution and for the single-metal solutions. This correlated well with predictions of maximum adsorption capacity (Q) for kaolin, where Q for Pb was about twice as much as that for Cu, both in the binary solution and in the single-metal solution. Competition from Cu in binary solution reduced Pb adsorption by 9%, while Cu rather increased by 4.1%, relative to their respective adsorptions in Pb-Only and Cu-Only, respectively. However, during competitive adsorption in the binary solution, the relative proportions of adsorbed Pb increased by 11.4% as the initial metals concentration increased from 10 – 75mg/L, while that of Cu reduced by the same proportion. This was explainable by their respective separation factors (RL), which indicated higher favorability of kaolin for Pb than for Cu. Furthermore, bonding energy (KL) of Pb unto kaolin during competition was about 2.5 times that of Cu, and was likely able to cause Pb to displace Cu from kaolin surface. This study reveals greater adsorption capacity of kaolin for Pb than for Cu, and could provide the basis for future projects/studies that would employ kaolin in Pb and Cu removal.
14
Paternina, Erika Beatriz Ruiz, Maria Natalia Piol, Andrea Beatriz Saralegui, Néstor Caracciolo, and Susana P. Boeykens. "Remoción de Iones Metálicos de Mezclas Binarias Usando Dolomita." KnE Engineering 3, no. 1 (2018): 679. http://dx.doi.org/10.18502/keg.v3i1.1471.
Full textAbstract:
In the present work we evaluated the use of dolomite as an alternative for the adsorption of lead and copper ions from their aqueous solutions. The possible interferences between them and the selectivity of the process were studied working with mixtures of these two ions in adsorption processes. From the analysis of the results it can be inferred that the adsorption of lead is not affected by the presence of copper, since no changes in its adsorption capacity are observed as the concentration of the other ion changes. Copper adsorption is not affected by the presence of lead up to a copper level of 130 mg / L. For higher concentrations of copper, the antagonistic competition of Pb is manifested. From the kinetic studies performed at an equimolar concentration of Pb (400 mg / L) and Cu (130 mg / L), it was observed that the presence of copper increases the time required to reach the equilibrium of lead adsorption, but its adsorption capacity is unchanged. For the adsorption of copper the equilibrium time was not modified by the presence of lead.Keywords: Competitive adsorption, binary mixtures, copper, lead.
15
Xu, Lei, Hongbiao Cui, Xuebo Zheng, et al. "Adsorption of Cu2+ to biomass ash and its modified product." Water Science and Technology 2017, no. 1 (2018): 115–25. http://dx.doi.org/10.2166/wst.2018.095.
Full textAbstract:
Abstract Ash produced by biomass power plants has great potential for the removal of heavy metal ions from aqueous solution. The pollution of toxic heavy metals to water is a worldwide environmental problem. Discharges containing copper, in particular, are strictly controlled because the excessive copper can cause serious harm to the environment and human health. This work aims to investigate the adsorption characteristics of copper ions in aqueous solution by biomass ash and the modified products, and to evaluate their potential application in water pollution control. The biomass ash was modified with a mesoporous siliceous material and functionalized with 3-aminopropyltriethoxysilane. The surface properties of the biomass ash and the new matrix were studied to evaluate their adsorption property for Cu2+ ions at different pHs, initial metal concentrations and the thermodynamic and kinetic were studied. The chemical and morphological properties of this modified material are analyzed; the specific surface area of the modified biomass ash was nine times that of the initial ash. Both of the two materials showed a strong affinity for Cu2+, and the Langmuir model could best represent the adsorption characteristics of Cu2+ on the two kinds of materials. The adsorption capacity of copper on the material increased with the increase of pH and pH 6 was the optimum pH. Thermodynamic analysis results showed that the adsorption of Cu2+ was spontaneous and endothermic in nature. The adsorptions of Cu2+ onto the modified biomass ash followed pseudo-second-order kinetics.
16
Vasylechko, V. O., L. O. Lebedynets, G. V. Gryshchouk, Yu B. Kuz'ma, L. O. Vasylechko, and T. M. Bernats'ka. "Adsorption of Copper on Transcarpathian Mordenite." Adsorption Science & Technology 14, no. 5 (1996): 267–77. http://dx.doi.org/10.1177/026361749601400501.
Full textAbstract:
The adsorption properties of Ukrainian Transcarpathian mordenite in aqueous copper(II) solutions under dynamic conditions have been investigated. Under optimum conditions (pH of Cu2+ solution = 6.5; adsorbent thermallly modified over 2.5 h at 150°C; rate of passage of Cu2+ solution through adsorbent = 3 ml/min) the adsorption capacity of the mordenite towards copper amounted to 1020 μg/g. Copper is effectively desorbed by an aqueous solution of HNO3 (1:2). Under optimum desorption conditions the effective extraction of copper was 99.8%.
17
Hess, Brianna J., Praveen Kolar, John J. Classen, Detlef Knappe, and Jay J. Cheng. "Evaluation of Waste Eggshells for Adsorption of Copper from Synthetic and Swine Wastewater." Transactions of the ASABE 61, no. 3 (2018): 967–76. http://dx.doi.org/10.13031/trans.12599.
Full textAbstract:
Abstract. Biomass-derived adsorbents are an attractive alternative to conventional water treatment methods. This study evaluated eggshells produced by the liquid egg and food processing industry for the adsorption of copper from aqueous systems. Research objectives were to (1) determine copper adsorption mechanisms and (2) evaluate copper adsorption by eggshells for the treatment of wastewater. Batch experiments were performed by contacting eggshells with copper solutions to obtain equilibrium, kinetic, and thermodynamic data to determine removal mechanisms and maximum adsorption capacity. Results suggested that the adsorption of copper followed a second-order kinetic model with a theoretical maximum adsorption capacity of 4.3 mg g-1 (20°C). In addition, eggshell adsorption was found to be a favorable process, with an activation energy of approximately 27 to 29 kJ mol-1, and followed similar mechanisms as its calcite analog. Data indicated that slightly acidic (pH = 6) to near-neutral pH conditions enhanced adsorption of copper. Additional experiments were performed using swine lagoon wastewater to evaluate the efficacy of eggshells to treat copper from lagoon wastewater. The data suggested that unmodified eggshells were effective for application in swine lagoon systems only under acidic conditions (pH = 4). Further research is needed to modify eggshells that can adsorb copper in lagoon wastewater at neutral and alkaline pH. Keywords: Adsorption, Copper, Eggshell, Swine lagoon, Water.
18
Yang, Li Jiao, Feng Jie Zhang, Quan Sen Shao, Yun Na Wu, and Yu Ying Dong. "Effect of 2, 4-D on Adsorption of Copper onto the Black Soil." Advanced Materials Research 1051 (October 2014): 448–51. http://dx.doi.org/10.4028/www.scientific.net/amr.1051.448.
Full textAbstract:
Batch equilibrium adsorption was conducted to study the adsorption of copper in the black soil and the effect of 2, 4-dichlorophenoxyacetic acid (2, 4-D) on adsorption of copper was probed by soils. The results showed all of the adsorption isotherms of copper in the absence and presence of 2,4-D could be described by Freundlich equation (R2>0.99), the adsorption coefficients Kf increased with increasing concentration of 2,4-D.The In kinetic modeling, the pseudo-first order equation was considered as the most celebrated model. The pseudo-second order equation in copper was depressed in the presence of 2, 4-D. 2,4-D diminished the adsorption of copper on the black soil.
19
Reyes, Arturo, María Victoria Letelier, and Gustavo Lagos. "Adsorption of humic and fulvic acid on copper surfaces." Water Supply 10, no. 6 (2010): 915–22. http://dx.doi.org/10.2166/ws.2010.632.
Full textAbstract:
The presence of natural organic matter (NOM) in drinking water can increase the levels of copper released from copper pipes to water and inhibit the formation of protective deposits such as malachite. Since adsorption of NOM on copper pipes surfaces is believed to be one of mechanisms that explains this phenomenom, the objective of this study was to determine kinetics and the adsorption equilibrium of main components of NOM, humic acid (HA) and fulvic acid (FA), onto copper surfaces. The kinetics and equilibrium adsorption of HA and FA on copper foils were examined using batch experiments at 22°C. HA and FA followed pseudo second-order kinetics adsorption. Rate constants measured were 2.59 × 10−1 (mgTOC cm−2 h−1) for HA and 3.13 × 10−1 (mgTOC cm−2 h−1) for FA. The adsorption behavior of HA and FA on the copper surface is in accordance with the Langmuir adsorption isotherm. Langmuir adsorption constants measured were 5.98 × 10−2 L mg−1 for HA and 4.78 × 10−2 L mg−1 for FA. The copper foils exposed during five months to FA formed malachite deposits, whereas those exposed to HA did not and just cuprite was found. The results of this study showed that both HA as well as FA adsorption on copper surfaces is favored and no significant differences were found in the adsorption parameters calculated for both compounds. However, the inhibition of the malachite precipitation could be attributed to the HA adsorption.
20
Essebaai, Hanane, Ilham Ismi, Ahmed Lebkiri, Said Marzak, and El Housseine Rifi. "Kinetic and Thermodynamic Study of Adsorption of Copper (II) Ion on Moroccan Clay." Mediterranean Journal of Chemistry 9, no. 2 (2019): 102–15. http://dx.doi.org/10.13171/mjc92190909510he.
Full textAbstract:
Highly efficient low-cost adsorbent was applied for copper (II) ions uptake from aqueous solution. Characteristics of natural adsorbent were established using scanning X-ray diffraction (XRD), X-ray fluorescence, electron microscope (SEM) and Fourier Transform Infra-Red (FTIR). Various physicochemical parameters such as contact time, initial copper(II) ions concentration, adsorbent dosage, pH of copper (II) ions solution and temperature were investigated. The result showed that the adsorption of copper (II) ions by natural clay was favorable at pH=5,5. The adsorption was found to increase with increase in initial copper (II) ions concentration, and contact time. Equilibrium adsorption data were fitted using three isotherms and kinetic data tested with four kinetic models. Freundlich isotherm best described the adsorption of copper (II) ions onto utilised clay, the maximum monolayer adsorption capacity (qmax) was 8 mg/g. Pseudo-second-order model best described the kinetics of the adsorption process. Thermodynamic parameters such as Gibbs free energy, enthalpy and entropy were determined. It was found that copper (II) ions adsorption was spontaneous (ΔG°<0) and endothermic (ΔH°>0).
21
Hanzlík, P., J. Jehlička, Z. Weishauptová, and O. Šebek. "Adsorption of copper, cadmium and silver from aqueous solutions onto natural carbonaceous materials." Plant, Soil and Environment 50, No. 6 (2011): 257–64. http://dx.doi.org/10.17221/4030-pse.
Full textAbstract:
Twelve carbonaceous materials were investigated for adsorption of Cd, Cu and Ag from water solutions. Before the adsorption experiments the chemical and structural characterization of all materials were made. The batch adsorption experiment was used. The kinetic of the adsorption process was very fast for the first five hours but very slow for approximately the next 65 hours. Nevertheless the maximum amount of metal removed was achieved during the first stage of about five hours. Biological materials (milled wood, bark, cork) exhibited a very low affinity for adsorption of metals. The best results were obtained for materials in an intermediate degree of carbonisation with a high content of oxygen rich functional groups. Although the highly carbonised materials exhibited low ability to adsorb copper or cadmium, their capacity to bind silver was very high.
22
Adeyemo, A. "Adsorption of Copper by Biochar." International Research Journal of Pure and Applied Chemistry 4, no. 6 (2014): 727–36. http://dx.doi.org/10.9734/irjpac/2014/11079.
Full text
23
Cotter, C., and J. T. Trevors. "Copper Adsorption by Escherichia coli." Systematic and Applied Microbiology 10, no. 3 (1988): 313–17. http://dx.doi.org/10.1016/s0723-2020(88)80018-3.
Full text
24
González-Dávila, Melchor, J. Magdalena Santana-Casiano, and Luis M. Laglera. "Copper adsorption in diatom cultures." Marine Chemistry 70, no. 1-3 (2000): 161–70. http://dx.doi.org/10.1016/s0304-4203(00)00020-7.
Full text
25
Ciobanu, Gabriela, Ana Maria Mateiuc, Constantin Luca, and Florin Alexandru Luca. "COPPER(II) ADSORPTION ONTO HYDROXYAPATITE." Environmental Engineering and Management Journal 16, no. 10 (2017): 2353–59. http://dx.doi.org/10.30638/eemj.2017.243.
Full text
26
Stepova, K., L. Sysa, A. Kontsur, and O. Myakush. "Adsorption of Copper Ions by Microwave Treated Bentonite." Physics and Chemistry of Solid State 21, no. 3 (2020): 537–44. http://dx.doi.org/10.15330/pcss.21.3.537-544.
Full textAbstract:
Changes of bentonite surface structure under the influence of direct microwave irradiation during adsorpion of Cu2+ from concentrated solutions were investigated by X-ray and EDS analysis. The microwave treated bentonite (MTB) has been proved to have enhanced adsorption capacity for copper due to improved pore structure and some peculiarities of adsorption mechanism. The non-linear fitting of experimental data to the theoretical isotherms have demonstrated that the adsorption on natural bentonite fitted the Toth model, whilst microwave-treated bentonite fitted the Langmur-Freundlich model. The isotherm modeling allowed predicting the maximal adsorption capacities 44.8 mg/g. XRD and SEM analysis of MTB sample after adsorption indicated formation of microcrystals of individual copper compound. The adsorption on MTB sample takes place not only in pores or in monomolecular layer on the bentonite surface, but the prevalent mechanism is surface-induced co-precipitation of copper as microcrystals of individual copper compound.
27
Varma V., Geetha, and Anil K. Misra. "Copper contaminated wastewater – An evaluation of bioremedial options." Indoor and Built Environment 27, no. 1 (2016): 84–95. http://dx.doi.org/10.1177/1420326x16669397.
Full textAbstract:
The potential of papaya leaf powder and paddy straw powder for copper(II) removal was evaluated from aqueous solution via column and batch adsorption studies. Batch adsorption studies were performed to determine the contact time effects, biosorbent dosage, pH and initial concentration of metal ion on adsorption capacity. Results showed approximately 90% to 95% of copper removal using both the adsorbents from the solution. As the amount of biosorbent increases, the biosorption capacity also increases. Findings indicate that pH is an important factor for metal ion biosorption and 7.0 is the optimum pH for copper removal. For explaining the mechanism of copper distribution into the solid and liquid phases in batch studies, Freundlich isotherm and Langmuir adsorption isotherm model are used and findings illustrate that adsorption phenomenon is better represented by Freundlich isotherm. Maximum adsorption capacity of copper was calculated as 24.63 mg/g and 37.17 mg/g for papaya powder and for paddy straw powder, respectively, by using Langmuir model. The adsorption phenomenon complies with the pseudo-second-order rate equation. Using packed bed column, the biosorbents’ ability of copper(II) ions removal from aqueous solution was also examined and an S shape profile was obtained for the breakthrough curve. For practical applications, both the adsorbents can be effectively used for wastewater treatment owing to their high capacity of adsorption of heavy metals at very low cost.
28
Gong, Zhili, Shini Peng, Xiaomei Huang, and Lanzhou Gao. "Investigation the Corrosion Inhibition Effect of Itraconazole on Copper in H2SO4 at Different Temperatures: Combining Experimental and Theoretical Studies." Materials 11, no. 11 (2018): 2107. http://dx.doi.org/10.3390/ma11112107.
Full textAbstract:
The anti-corrosion inhibition effect of itraconazole on copper (Cu) in 0.5 M H2SO4 is observed with variety of experimental methods, including electrochemical measurement, surface morphology analysis, and theoretical calculations. These experimental results all confirm that itraconazole exhibits excellent anti-corrosion performance in the certain temperatures range (298 K–313 K) for copper in sulfuric acid solution. In addition, corresponding adsorption isothermal models were used to fit the adsorption behavior of itraconazole on the copper surface. The results show that the Langmuir adsorption model agrees best with the experimental results. The adsorption of itraconazole on the copper surface belongs to chemical and physical adsorption.
29
Alhakawati, M. S., C. J. Banks, and D. Smallman. "Evaluation of two types of polyurethane for the immobilisation of Rhizopus oryzae for copper uptake." Water Science and Technology 47, no. 9 (2003): 143–50. http://dx.doi.org/10.2166/wst.2003.0512.
Full textAbstract:
Previous studies have shown that Rhizopus oryzae strain IM 057412 grown in reticulated polyurethane foam demonstrated the same heavy metal adsorption capacity as the free biomass. Immobilisation in other types of polymers was shown to reduce the biomass uptake capacity because of mass transfer limitations due to the restricted porosity of the immobilisation matrices. For practical purposes the growing of biomass in polyurethane support particles to use as a commercial adsorbent is not viable or financially sound. The current work describes a different approach in which dried non-viable cells of R. Oryzae were incorporated into two types of polyurethane carrier matrix during the production process. The polymers used were a conventional hydrophobic polyurethane and a hydrophilic polyurethane, Hypol 2002. Oven-dried and powdered particles (D&lt;150 μm) of R. oryazea were immobilised by mixing the biomass with each of the polymers prior to the reaction in which the polymer was expanded to form a foam: consequently the biomass was uniformly dispersed throughout the porous matrix. The resulting fungi-polyurethane matrices were then cut into cubes (≡4-5 mm dimension) and their adsorptive properties studied with respect to copper. Experiments were conducted in shake flasks to establish the equilibrium time for the reaction for both free and immobilised biomass. The biomass immobilised in Hypol gave the same adsorptive capacity as that of free biomass when compared on a weight basis, but biomass immobilised in conventional polyurethane foam showed no adsorption. To assess fully the effect of pH on copper and to eliminate precipitation as a removal mechanism experiments were conducted at different pHs and different copper concentrations. In each case the solution pH was maintained by acid or base addition in response to measurements using a standard calomel electrode. It was shown that at pH 5 copper concentrations above 100 mg l−1 were likely to precipitate. The amount of precipitation was accounted for within the high concentration adsorption isotherm experiments by using a mass balance approach. Results showed that the adsorption of the Hypol immobilised biomass followed the Langmuir adsorption isotherm model and showed the copper adsorption capacity of the matrix to be between 10 and 13 mg g−1. The copper attached to the immobilised biomass could easily be desorbed by increasing the acidity, allowing the matrix to be used in repetitive sorption-desorption cycles. There was a small decrease in the adsorption capacity after the first desorption cycle that could be explained by a partial loss of biomass as detected by loss of total organic carbon (TOC).
30
Jovic, V. D., and B. M. Jovic. "Copper electrodeposition from a copper acid baths in the presence of PEG and NaCl." Journal of the Serbian Chemical Society 66, no. 11-12 (2001): 935–52. http://dx.doi.org/10.2298/jsc0112935j.
Full textAbstract:
Copper electrodeposition from copper acid solutions containing PEG and NaCl has been investigated onto Cu(111), Cu(100) and polycrystalline copper electrodes using polarization and EIS measurements. The adsorption of sulphate and chloride anions, and PEG molecules, was investigated onto Cu(111) and Cu(100) by cyclic voltammetry and differential capacitance measurements. Differential capacitance vs. potential curves recorded onto Cu(100) in solutions containing 0.1 M H2SO4, 0.1 M H2SO4 + 10-3 M PEG and 0.1MH2SO4 + 10-3MPEG + 10-3MNaCl confirm that ?specific adsorption? of PEG molecules occurs in the absence of NaCl in the solution, in the potential region of copper electrodeposition, e.g., between -1.0 V and -0.5 V vs. SSE. In the presence of chloride ions, the adsorption of PEG molecules is suppressed and there is no evidence of adsorption of neutral PEG molecules. It is shown that hysteresis, appearing on the polarization curves of copper electrodeposition, is not a consequence of competition between inhibition provided by the Cl-PEG/Cu2+/Cu+/Cu interface and the catalytic effects of Cl-MPSA/Cu2+/Cu+/Cu interaction, because hysteresis is present in the solution containing only PEG and NaCl, e.g., in the absence of MPSA. EIS measurements confirm the simultaneous occurrence of two processes during copper electrodeposition: deposition of copper by discharge of Cu2+ ions and ?specific adsorption? and discharge of some heavily charged species, most probably containing Cu, PEG and Cl.
31
Veeravelan, K., S. Arivoli, and V. Marimuthu. "ADSORPTION CHARACTERISTICS OF ZIZYPHUS JUJUBA SEED SHELL ACTIVATED NANO POROUS CARBON FOR REMOVING COPPER (II) IONS FROM WASTEWATER." International Journal of Research -GRANTHAALAYAH 4, no. 12 (2016): 226–41. http://dx.doi.org/10.29121/granthaalayah.v4.i12.2016.2412.
Full textAbstract:
In the present study, adsorption of copper (II) ions from aqueous solution by Activated Zizyphus Jujuba shell Nano Carbon was investigated under batch mode. The influence of solution pH, sorbent dose, copper concentration, contact time and temperature was studied. The copper adsorption was favored with maximum adsorption at pH 6.5. Sorption equilibrium time was observed in 60 min. The equilibrium adsorption data were correlated with Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Hurkins-Jura, Halsay, Radlich-Peterson, Jovanovic and BET isotherm models. The kinetics of the adsorption process was tested by pseudo-first-order, pseudo-second order, Elovich and Intra-particle diffusion models. It was shown that adsorption of copper could be described by the pseudo-second order kinetic model. Thermodynamic parameters such as Gibbs free energy (ΔG0), the enthalpy (ΔH0) and the entropy change of sorption (ΔS0) have also been evaluated and it has been found that the adsorption process was spontaneous, feasible and endothermic in nature. The results indicated that Activated Zizyphus Jujuba shell Nano Carbon can be used as an effective and low-cost adsorbent to remove copper (II) from aqueous solution.
32
Liang, Xuan, Xue Gang Luo, and Xiao Yan Lin. "Adsorption Mechanism of Copper(II) Ions on Expansion-Treated Rice Husk." Materials Science Forum 695 (July 2011): 13–16. http://dx.doi.org/10.4028/www.scientific.net/msf.695.13.
Full textAbstract:
Expansion-treated rice husk (ERH) had been used as adsorbent for removing copper(II) ions, and showed strong adsorption ability and removal efficiency for copper(II) ions. In this paper, the surface and bulk structures of ERH adsorbent were investigated by X-ray photoelectron spectroscopy (XPS) and scanning electronic microscopy (SEM), ERH was treated by water solution with different pH value, and the adsorption performance of ERH for copper(II) ions was investigated through adsorption static experiments in order to study the adsorption mechanism. The result showed that ERH treated by alkaline solution had high removal efficiency for copper(II) ions, the reason ascribed to the large surface area of ERH. ERH had competitive adsorption for H+ and Cu2+, and a monolayer adsorption process played an important role in the whole process.
33
Song, Guanling, Lijing Cao, Xiao Chen, Wenhua Hou, and Qunhui Wang. "Heavy metal adsorption changes of EAF steel slag after phosphorus adsorption." Water Science and Technology 65, no. 9 (2012): 1570–76. http://dx.doi.org/10.2166/wst.2012.048.
Full textAbstract:
A kind of electric arc furnace (EAF) steel slag was phosphated, and its isothermal and dynamic adsorptions of copper, cadmium, and lead ions were measured to determine if heavy metal adsorption changes after phosphorus adsorption. The surface area increased greatly after the slag was phosphated. Isothermal adsorption experiments showed that the theoretical Qmax of the EAF steel slag on Cu2+, Cd2+, and Pb2+ improved 59, 50, and 89% respectively after it was phosphated. Dynamic adsorption results showed that the greatest adsorption capacities of unit volume of Cu2+, Cd2+, and Pb2+ were 2.2, 1.8, and 1.8 times that of the column packed with original EAF steel slag when the column was packed with phosphate EAF steel slag at the same heavy metal ion concentration. The breakthrough time, the exhaustion time and elution efficiency of the column also increased when the column was packed with phosphated EAF steel slag compared with that packed with original EAF steel slag. Phosphorus adsorption could further improve the heavy metal ion adsorption of the EAF steel slag.
34
Guo, Tiecheng, Sicong Yao, Hengli Chen, Xin Yu, Meicheng Wang, and Yao Chen. "Characteristics and adsorption study of the activated carbon derived from municipal sewage sludge." Water Science and Technology 76, no. 7 (2017): 1697–705. http://dx.doi.org/10.2166/wst.2017.352.
Full textAbstract:
Sewage sludge-based activated carbon is proved to be an efficient and low-cost adsorbent in treatment of various industrial wastewaters. The produced carbon had a well-developed pore structure and relatively low Brunauer–Emmett–Teller (BET) surface area. Adsorptive capacity of typical pollutants, i.e. copper Cu(II) and methylene blue (MB) on the carbon was studied. Adsorptions were affected by the initial solution pH, contact time and adsorbent dose. Results showed that adsorption of Cu(II) and MB on the produced carbon could reach equilibrium after 240 min. The average removal rate for Cu(II) on the carbon was high, up to 97% in weak acidic conditions (pH = 4–6) and around 98% for MB in a very wide pH range (pH = 2–12). The adsorption kinetics were well fitted by the pseudo-second order model, and both Langmuir and Freundlich isotherm models could well describe the adsorption process at room temperature. The theoretical maximum adsorption capacities of Cu(II) and MB on sewage sludge-based activated carbon were 114.94 mg/g and 125 mg/g, respectively. Compared with commercial carbon, the sewage sludge-based carbon was more suitable for heavy metal ions’ removal than dyes’.
35
Cao, J., and D. P. Kamdem. "Moisture adsorption characteristics of copper-ethanolamine (Cu-EA) treated Southern yellow pine (Pinus spp.)." Holzforschung 58, no. 1 (2004): 32–38. http://dx.doi.org/10.1515/hf.2004.005.
Full textAbstract:
Abstract Moisture adsorption isotherms were determined for untreated and copper-ethanolamine (Cu-EA) treated wood at different copper retention levels. The Cu-EA treatment reduces the water vapor accessibility in wood because copper has occupied some of the adsorption sites for moisture during the treatment. The percentage of adsorption sites occupied by copper was evaluated by M t/M u, which is the ratio of equilibrium moisture content for treated wood to untreated wood. The results show that, within the copper retention range used in this study, the M t/M u value decreases linearly at lower temperatures (4 and 15 °C) or logarithmically at higher temperatures (30 and 40 °C) with the increase of copper retention, suggesting that the percentage of adsorption sites occupied by copper (P) increases linearly or logarithmically with the copper retention in Cu-EA treated wood. P decreases with the increase of relative humidity. The reason is that more adsorption sites become available for moisture at higher relative humidity. It has also been found that the influence of Cu-EA treatment on hydrated water (M h) is more significant than that on dissolved water (M s).
36
Dias, Ana Cristi Basile, Marcos Antonio Pavan, Mário Miyazawa, and Décio Carlos Zocoler. "Plant residues: short term effect on sulphate, borate, zinc and copper adsorption by an acid oxisol." Brazilian Archives of Biology and Technology 46, no. 2 (2003): 199–202. http://dx.doi.org/10.1590/s1516-89132003000200010.
Full textAbstract:
Laboratory experiments were carried out to examine the effects of plant residues on Cu, Zn, B and S adsorption by an acidic oxisol. The plant residues were: black oats (Avena strigosa), oil seed radish(Raphanus sativus), velvet beans (Stizolobium cinereum), and pigeon pea (Cajanus cajan) collected at flowering stage. Plant residues increased Cu and Zn adsorptions and decreased B and S adsorptions. The results indicated that for short term effect plant residues decreased the availabilities of Cu and Zn through metal organic complex reactions and increased availabilities of S and B through competition with organic anions by the adsorption sites on soil.
37
Uyguner, C. S., and M. Bekbolet. "TiO2-assisted photocatalytic degradation of humic acids: effect of copper ions." Water Science and Technology 61, no. 10 (2010): 2581–90. http://dx.doi.org/10.2166/wst.2010.174.
Full textAbstract:
The present study investigated the removal efficiency of aqueous humic acid solutions by TiO2 photocatalytic degradation in the presence of Cu(II) species. The pseudo-first-order kinetics revealed rate constants as 9.87 × 10−3, 7.19 × 10−3, 3.81 × 10−3 min−1 for Color436, UV254 and TOC, respectively. Comparatively, lower rate constants were attained with respect to photocatalytic degradation of humic acid. Considering the source-dependent diverse chemical and spectral characteristics of NOM, a particular interaction would be expected for humic acid with Cu(II) species (0.1 mg L−1). The presence of copper ions significantly altered the photocatalytic degradation kinetics of humic acids in relation to the concentration effects of humic acid as expressed by spectroscopic parameters and TOC. Batch equilibrium adsorption experiments revealed a distinct Langmuirian-type adsorptive behavior of humic acid onto TiO2 both in terms of UV254 and Color436 and a C-type adsorption isotherm was attained for TOC. KF values displayed an inconsistent effect of Cu(II) species, while adsorption intensity factor 1/n&lt;1 denoted a prevailing favorable type of adsorption for Color436 and UV254. Because of the role of intra- and intermolecular interactions between copper ions and humic molecular size fractions, spectroscopic techniques were also employed for the assessment of the adsorption as well as photocatalytic degradation efficiencies.
38
Celebi, Neslihan, Hayrunnisa Nadaroglu, Ekrem Kalkan, and Recep Kotan. "Removal of copper from copper-contaminated river water and aqueous solutions using Methylobacterium extorquens modified Erzurum clayey soil." Archives of Environmental Protection 42, no. 4 (2016): 58–69. http://dx.doi.org/10.1515/aep-2016-0035.
Full textAbstract:
Abstract The objective of this study was to investigate the possibility of using natural and bacteria-modified Erzurum clayey soil with Methylobacterium extorquens as an alternative to high cost commercial adsorbent materials for the removal of copper from aqueous solution. The copper concentrations in the samples of the polluted river water and CuCl2 solutions treated by the natural and bacteria-modified Erzurum clayey soil (ECS) have been determined by spectrophotometric method. Firstly, the surface of ECS was modified with M. extorquens and surface functionality was increased. Then, the adsorption of Cu (II) from solution phases was studied with respect to varying metal concentration, pH, and temperature and agitation time. The maximum adsorption of Cu (II) for natural and bacteria-modified Erzurum clayey soil was observed at pH: 5.0. At different copper concentrations, copper adsorption analysis was performed on 1 g using clay soil or modified clay soil. Maximum adsorption of Cu (II) was obtained as 45.7 and 48.1 mg g-1 at initial concentration (50 mg/50 mL) and optimal conditions by natural and bacteria-modified clay soil, respectively. The copper concentration was decreased in the substantial amount of the leachates solutions of natural and bacteria-modified clay soil. Langmuir and Freundlich isotherms were used to describe the adsorption behavior of Cu (II) ions. The results showed that modified clay soil had a high level of adsorption capacity for copper ion. The various thermodynamic parameters such as ΔG°, ΔH° and ΔS° were analyzed to observe the nature of adsorption. The structural properties of the natural and bacteria-modified-ECS have been characterized by SEM, FTIR and XRD techniques. Consequently, it was concluded that the bacteria-modified clay soil could be successfully used for the removal of the copper ions from the aqueous solutions.
39
Banat, Fawzi, Sameer Al-Asheh, and Leena Abu-Aitah. "Competitive Adsorption of Phenol, Copper Ions and Nickel Ions on to Heat-Treated Bentonite." Adsorption Science & Technology 20, no. 2 (2002): 107–17. http://dx.doi.org/10.1260/026361702320360531.
Full textAbstract:
Industrial effluents often contain a mixture of organic and inorganic pollutants. Since the degree of removal of any solute might be affected by the presence of the other, it is important to study the competitive adsorption of these solutes. Batch experiments were carried out to study the competitive adsorption of binary combinations of phenol, copper and nickel compounds in aqueous mixtures on to heat-treated bentonite. The uptake of phenol was not affected by the presence of copper or nickel ions. However, the uptake of copper and nickel decreased in the presence of phenol. In a system that only contained both metal ions in solution, the adsorption capacity of nickel was depressed to a greater extent than that of copper. The pH of the solution strongly affected the adsorption capacity of copper in the phenol/copper system.
40
Pan, Qing-qing, and Hui-qing Peng. "Effect of Copper and Iron Ions on the Sulphidizing Flotation of Copper Oxide in Copper Smelting Slag." Advances in Materials Science and Engineering 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/4656424.
Full textAbstract:
The treatment of smelting slag has attracted much attention nowadays. This study investigates the influence of Na2S, CuSO4, and FeCl3 on sulphidizing flotation of copper oxide. The results show that a proper Cu2+ concentration can increase the sulphidizing effect of copper oxide, while Fe3+ inhibits the sulphidizing effect. Further analysis shows that Cu2+ ions can reduce the surface potential, increase the S2− adsorption, then generate more polysulfide, and therefore promote the sulphidizing flotation. However, Fe3+ ions would increase the surface potential, reduce the S2− adsorption, generate more sulfur element, and therefore inhibit the sulphidizing flotation.
41
Lv, Junmin, Yulong Ma, Xuan Chang, et al. "Chemical adsorption of oxytetracycline from aqueous solution by modified molecular sieves." Water Science and Technology 75, no. 5 (2016): 1221–32. http://dx.doi.org/10.2166/wst.2016.604.
Full textAbstract:
The removal of oxytetracycline (OTC) from aqueous solution on modified molecular sieve via adsorption was investigated in the present work. The copper(II) modified molecular sieve had the much higher adsorbed amount than unmodified one. The bigger pore, the more adsorption sites benefitted for the adsorbed amount of OTC. The exchanged amount of copper(II) and the acid-base property of solution were important factors influencing the removal efficiency. The adsorption kinetics, the adsorption isotherm, the adsorption thermodynamics and the proposed adsorption mechanism were studied. The analysis of adsorption isotherm indicated it is a monolayer adsorption. The fitting with adsorption kinetics, pseudo-second-order model, deduced chemical adsorption is the main rate controlling step. And the new formation of Cu-O chemical bond and the changes at bands of N-H vibration and C-N vibration by Fourier transform infrared spectrometer further confirmed the proposal adsorption mechanism was the chemical complexation of copper(II) in modified 13X with NH2 group of OTC. As the real exchanged amount of copper(II) was 149.07 mg·g−1 and the solution pH 7.0, the adsorption capacity of modified 13X for OTC reached the maximum of 2,396 mg·g−1 (with the initial concentration of 1,000 mg·L−1).
42
Liang, Septimus H., Shiliang Wang, and David B. Pedersen. "Adsorption of HCN onto Copper@Copper-Oxide Core–Shell Nanoparticle Systems." Adsorption Science & Technology 27, no. 4 (2009): 349–61. http://dx.doi.org/10.1260/026361709790252632.
Full textAbstract:
Copper compounds are widely used as impregnants that enhance the removal of HCN by carbon-based filter media. The reaction mechanism involved is poorly understood. In this study, we have followed the reaction of HCN with pristine copper, copper oxide (CuO and Cu2O) and copper@copperoxide (Cu@Cu2O) core–shell nanoparticles of well-defined size and composition. We have established a cooperative reaction mechanism where both the copper oxide shell and copper core are required for the chemisorption of HCN onto copper nanoparticle impregnants. The suitability of copper@copperoxide nanoparticles as impregnants for the removal of HCN in respirator canisters is discussed.
43
Stankovic, Velizar, Dragana Bozic, Milan Gorgievski, and G. Bogdanovic. "Heavy metal ions adsorption from mine waters by sawdust." Chemical Industry and Chemical Engineering Quarterly 15, no. 4 (2009): 237–49. http://dx.doi.org/10.2298/ciceq0904237s.
Full textAbstract:
In this work the results on the batch and column adsorption of copper and some associated ions by employing linden and poplar sawdust as a low-cost adsorbent are presented. The mine water from a local abandoned copper mine, as well as synthetic solutions of those ions which are the main constituents of the mine water were both used as a model-system in this study. The adsorption ability of the chosen sawdust to adsorb heavy metal ions is considered as a function of the initial pH of the solution and kind of metal ions. At lower pH of solutions the adsorption percentage (AD %) decreases leading to a zero AD % at pH < 1.1. Maximum AD % is achieved at 3.5 < pH < 5. It was found that poplar and linden sawdust have both almost equal adsorption capacities against copper ions. The highest AD % ( ?80%) was achieved for Cu2+, while for Fe2+ it was slightly above 10%. The other considered ions (Zn2+ and Mn2+) were within this interval. The results obtained in the batch mode were verified through the column test by using the real mine water originating from an acid mine drainage (AMD) of the copper mine 'Cerovo', RTB Bor. The breakthrough curves are presented as a function of the aqueous phase volume passed through the column allowing having an insight into the column adsorption features. Breakthrough points were determined for copper, manganese and zinc ions. A very high adsorption degree - higher than 99% was achieved in these experiments for all mentioned ions. After completing the adsorption, instead of desorption, the loaded sawdust was drained, dried and burned; the copper bearing ash was then leached with a controlled volume of sulphuric acid solution to concentrate copper therein. The obtained leach solution had the concentration of copper higher than 15 g dm-3 and the amount of H2SO4 high enough to serve as a supporting electrolyte suitable to be treated by the electrowinning for recovery of copper. The technology process based on the column adsorption is proposed and discussed.
44
Tascioglu, Cihat, Paul Cooper, and Tony Ung. "Rate and extent of adsorption of ACQ preservative components in wood." Holzforschung 59, no. 5 (2005): 574–80. http://dx.doi.org/10.1515/hf.2005.094.
Full textAbstract:
Abstract The adsorption of copper, [as Cu(II)], monoethanolamine (MEA) and didecyldimethyl ammonium chloride (DDAC) components of CuMEA and alkaline copper quaternary (ACQ) solutions impregnated into wood was followed by measuring the changes in solution concentrations in the wood over time. The rate and extent of copper and MEA adsorption were highly dependent on the solution strength and the conditioning temperature. Both copper and MEA were adsorbed by the wood structure with a rapid initial reaction, with higher relative amounts sorbed from lower concentration solutions. This was followed by a slower adsorption that still had not equilibrated after 7 weeks at 22°C. Generally, the adsorption pattern was similar for copper and MEA, suggesting that they were adsorbed as a copper MEA complex, with an MEA/copper molar ratio close to the theoretical maximum of 4. At a higher conditioning temperature of 50°C the reaction time was greatly reduced, with the adsorption after 1 week higher than after 7 weeks at 22°C, suggesting faster and more complete reaction at higher temperatures. DDAC was adsorbed more quickly and to a higher degree than Cu(II) for all treatment solutions and should be preferentially removed from such solutions, especially if empty-cell treatments are used. There appeared to be higher Cu adsorption from the higher concentration solutions of CuMEA than from corresponding ACQ solutions, likely due to DDAC competition with copper for the same reaction sites.
45
Guo, Qiehui, Zhongyang Zang, Jie Ma, Jingyi Li, Tong Zhou, and Runping Han. "Adsorption of copper ions from solution using xanthate wheat straw." Water Science and Technology 82, no. 10 (2020): 2029–38. http://dx.doi.org/10.2166/wst.2020.487.
Full textAbstract:
Abstract To enhance adsorption capacity of wheat straw (WS) toward copper ion from solution, carbon disulfide was used to modify WS by a facile grafting method through epichlorohydrin and ethylenediamine. So WS containing xanthate groups (XWS) was obtained. The XWS was characterized using elemental analysis, X-ray diffraction, infrared spectroscopy and adsorption property of XWS toward copper ions. The results showed that S was introduced into the surface of WS. The solution pH was in favor of Cu2+ adsorption at pH 5, while NaCl existing in solution was slightly favorable for adsorption. The adsorption kinetic followed the pseudo-second-order kinetic model, while the adsorption isotherm curve was well fitted using the Langmuir model. The adsorption capacity was 57.5 mg·g−1 from experiment. The process was entropy-produced, endothermic and spontaneous in nature. The column adsorption was performed and Yan model was good to predict the breakthrough curve. XWS as adsorbent is promising to remove copper ions from solution, and this offers one way of effective utilization of waste byproduct from agriculture.
46
Li, Linbo, Lirong Zhao, Jian Ma, and Yuhong Tian. "Preparation of graphene oxide/chitosan complex and its adsorption properties for heavy metal ions." Green Processing and Synthesis 9, no. 1 (2020): 294–303. http://dx.doi.org/10.1515/gps-2020-0030.
Full textAbstract:
AbstractGraphene oxide hydrosol was added dropwise to the surface of chitosan (CS) to successfully obtain graphene oxide/chitosan composite (GC). The composite material was characterized by scanning electron microscopy and X-ray diffraction. The prepared adsorbent was used to simulate the static adsorption of copper, lead, and cadmium ions from 100 mL of 50 mg/L simulated wastewater samples. When the pH of the simulated wastewater is 6, initial dosage is 70 mg, adsorption time is 90 min, and temperature is 20°C; the adsorption capacities for copper, lead, and cadmium are 60.7, 48.7, and 32.3 mg/g, respectively. The adsorption and desorption cycle experiments show that the adsorption capacity of GC for copper ions can reach 86% of the initial adsorption capacity after ten cycles. The adsorption of lead ions on the composite conforms to the Freundlich adsorption isotherm model.
47
Duarte, Felipe Cimino, Maria das Graças Cardoso, Zuy Maria Magriotis, Wilder Douglas Santiago, João Guilherme Pereira Mendonça, and Leonardo Milani Avelar Rodrigues. "Removal of copper in cachaças using clays." Ciência e Agrotecnologia 38, no. 4 (2014): 382–89. http://dx.doi.org/10.1590/s1413-70542014000400009.
Full textAbstract:
Increased production and cachaça consumption has stimulated research regarding its quality. It is known that copper can be harmful to human health when it is in concentrated form in the beverage and is ingested in large amounts. Thus, there is a great concern among researchers and producers about the use of adsorbent substances for the removal of excess copper. The kinetic parameters and the adsorption isotherms for copper on kaolinite were studied to evaluate the physical-chemical quality of the cachaça before and after adsorption. K01, K03 and K04 kaolinites presented a maximum adsorption capacity of 97, 95 and 90%, respectively. The kinetic rates followed the pseudo-first-order model, and the adsorption isotherm was best adjusted to the Freundlich model. All the parameters of the control samples were within the limits required by law, except for the aldehydes and copper. After adsorption with clay, the values for some of the parameters were lower and those of others were not significantly different. It was possible to describe 87% of the data with the first and second principal components of the multivariate analysis, and all the samples were different from the control for the parameters analyzed. Thus, these clays can be used for the removal of copper from cachaça, but further studies are necessary.
48
Tanggebono, Iren S. A., Vanny M. A. Tiwow, and Minarni Rama Jura. "Kondisi Optimum Adsorpsi Arang Hayati dari Kulit Pisang Raja (Musa X paradisiaca L.) terhadap Logam Timbal (Pb) dan Tembaga (Cu)." Jurnal Akademika Kimia 7, no. 2 (2018): 55. http://dx.doi.org/10.22487/j24775185.2018.v7.i2.10393.
Full textAbstract:
This study aimed to determine the optimum condition of biocharcoal from banana peel on adsorption of lead (Pb) and copper (Cu) metals based on the variation of weights and biocharcoal contact times. Banana peel used in this research were taken from Sidondo III the village, Sigi, Central Sulawesi. To determine absorbed metals in biocharcoal banana peel was measured by a spectrophotometer spectroDirect. The results showed that the optimum weight of adsorption lead (Pb) ion was 80 mg and copper (Cu) ion was 40 mg with each percentage adsorption of 73.91% and 21.23%, respectively. The optimum time to adsorb lead and copper ions was 90 minutes with the percentage adsorption of 89.13% for lead ion and 25.86% for copper ion.
49
Liu, Ya Li, Xiu Rong Zhao, Dan Ma, Yu Fei Li, and Run Ping Han. "Adsorption of Copper (II) from Solution by Wheat Husk in Batch Mode." Advanced Materials Research 393-395 (November 2011): 1093–97. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.1093.
Full textAbstract:
Wheat husk, an agriculture byproduct, was used to adsorb copper (II) from aqueous solutions. Variables of the system, including contact time, pH, salt concentration, and equilibrium copper concentration, were adopted to study their effects on copper (II) adsorption. The results showed that coexisted salt was not favor of adsorption and pH value near 5 was favor of adsorption. Adsorbent quantity of copper onto wheat husk increased with the equilibrium concentration increasing. The kinetic process can be predicted by Elovich model while the equilibrium data was fitted better by Freundlich model.
50
ISAGAI, Hiroo, and Hayao SAKAMOTO. "Adsorption of Copper(II) on Shirasu." BUNSEKI KAGAKU 54, no. 10 (2005): 965–68. http://dx.doi.org/10.2116/bunsekikagaku.54.965.
Full text