Journal articles: 'Pharmaceutical Adsorption'

1

Kryuchkova, Marina, Svetlana Batasheva, Farida Akhatova, Vasily Babaev, Daina Buzyurova, Anna Vikulina, Dmitry Volodkin, Rawil Fakhrullin, and Elvira Rozhina. "Pharmaceuticals Removal by Adsorption with Montmorillonite Nanoclay." International Journal of Molecular Sciences 22, no. 18 (September 7, 2021): 9670. http://dx.doi.org/10.3390/ijms22189670.

Full text

Abstract:

The problem of purifying domestic and hospital wastewater from pharmaceutical compounds is becoming more and more urgent every year, because of the continuous accumulation of chemical pollutants in the environment and the limited availability of freshwater resources. Clay adsorbents have been repeatedly proposed as adsorbents for treatment purposes, but natural clays are hydrophilic and can be inefficient for catching hydrophobic pharmaceuticals. In this paper, a comparison of adsorption properties of pristine montmorillonite (MMT) and montmorillonite modified with stearyl trimethyl ammonium (hydrophobic MMT-STA) towards carbamazepine, ibuprofen, and paracetamol pharmaceuticals was performed. The efficiency of adsorption was investigated under varying solution pH, temperature, contact time, initial concentration of pharmaceuticals, and adsorbate/adsorbent mass ratio. MMT-STA was better than pristine MMT at removing all the pharmaceuticals studied. The adsorption capacity of hydrophobic montmorillonite to pharmaceuticals decreased in the following order: carbamazepine (97%) > ibuprofen (95%) > paracetamol (63–67%). Adsorption isotherms were best described by Freundlich model. Within the pharmaceutical concentration range of 10–50 µg/mL, the most optimal mass ratio of adsorbates to adsorbents was 1:300, pH 6, and a temperature of 25 °C. Thus, MMT-STA could be used as an efficient adsorbent for deconta×ating water of carbamazepine, ibuprofen, and paracetamol.

APA, Harvard, Vancouver, ISO, and other styles

2

de Ridder, D. J., A. R. D. Verliefde, S. G. J. Heijman, J. Q. J. C. Verberk, L. C. Rietveld, L. T. J. van der Aa, G. L. Amy, and J. C. van Dijk. "Influence of natural organic matter on equilibrium adsorption of neutral and charged pharmaceuticals onto activated carbon." Water Science and Technology 63, no. 3 (February 1, 2011): 416–23. http://dx.doi.org/10.2166/wst.2011.237.

Full text

Abstract:

Natural organic matter (NOM) can influence pharmaceutical adsorption onto granular activated carbon (GAC) by direct adsorption competition and pore blocking. However, in the literature there is limited information on which of these mechanisms is more important and how this is related to NOM and pharmaceutical properties. Adsorption batch experiments were carried out in ultrapure, waste- and surface water and fresh and NOM preloaded GAC was used. Twenty-one pharmaceuticals were selected with varying hydrophobicity and with neutral, negative or positive charge. The influence of NOM competition and pore blocking could not be separated. However, while reduction in surface area was similar for both preloaded GACs, up to 50% lower pharmaceutical removal was observed on wastewater preloaded GAC. This was attributed to higher hydrophobicity of wastewater NOM, indicating that NOM competition may influence pharmaceutical removal more than pore blocking. Preloaded GAC was negatively charged, which influenced removal of charged pharmaceuticals significantly. At a GAC dose of 6.7 mg/L, negatively charged pharmaceuticals were removed for 0–58%, while removal of positively charged pharmaceuticals was between 32–98%. Charge effects were more pronounced in ultrapure water, as it contained no ions to shield the surface charge. Solutes with higher log D could compete better with NOM, resulting in higher removal.

APA, Harvard, Vancouver, ISO, and other styles

3

Mansouri, Fatma, Khawla Chouchene, Nicolas Roche, and Mohamed Ksibi. "Removal of Pharmaceuticals from Water by Adsorption and Advanced Oxidation Processes: State of the Art and Trends." Applied Sciences 11, no. 14 (July 20, 2021): 6659. http://dx.doi.org/10.3390/app11146659.

Full text

Abstract:

Pharmaceutical products have become a necessary part of life. Several studies have demonstrated that indirect exposure of humans to pharmaceuticals through the water could cause negative effects. Raw sewage and wastewater effluents are the major sources of pharmaceuticals found in surface waters and drinking water. Therefore, it is important to consider and characterize the efficiency of pharmaceutical removal during wastewater and drinking-water treatment processes. Various treatment options have been investigated for the removal/reduction of drugs (e.g., antibiotics, NSAIDs, analgesics) using conventional or biological treatments, such as activated sludge processes or bio-filtration, respectively. The efficiency of these processes ranges from 20–90%. Comparatively, advanced wastewater treatment processes, such as reverse osmosis, ozonation and advanced oxidation technologies, can achieve higher removal rates for drugs. Pharmaceuticals and their metabolites undergo natural attenuation by adsorption and solar oxidation. Therefore, pharmaceuticals in water sources even at trace concentrations would have undergone removal through biological processes and, if applicable, combined adsorption and photocatalytic degradation wastewater treatment processes. This review provides an overview of the conventional and advanced technologies for the removal of pharmaceutical compounds from water sources. It also sheds light on the key points behind adsorption and photocatalysis.

APA, Harvard, Vancouver, ISO, and other styles

4

Ferchichi, Maroua, and Hatem Dhaouadi. "Sorption of paracetamol onto biomaterials." Water Science and Technology 74, no. 1 (April 29, 2016): 287–94. http://dx.doi.org/10.2166/wst.2016.218.

Full text

Abstract:

Pharmaceutical residues released into the environment are posing more and more public health problems. It is worthwhile to study the retention of pharmaceuticals residues by adsorption on solid supports. Batch sorption experiments are intended to identify the adsorption isotherms of the pharmaceutically active ingredient on the biomaterials. The results obtained in this study have shown that the retention possibilities of these compounds by bio-adsorbents (clay and sand) are not significant. The negligible sorption for these media is explained by the low hydrophobicity of paracetamol (Log Kow = 0.46). The retention of paracetamol on the dehydrated sewage sludge and on Posidonia oceanica showed a relatively significant adsorption with a maximal quantity of 0.956 mg g−1 and 1.638 mg g−1 for the dehydrate sludge and P. oceanica, respectively. On the other hand, the study of paracetamol retention on the powdered activated carbon showed a high adsorption capacity of about 515.27 mg g−1. Isotherm data show a good fit with Langmuir's model. An infrared analysis is carried out. It shows identical bands before and after adsorption, with some modifications.

APA, Harvard, Vancouver, ISO, and other styles

5

Meler, Jan, Bożena Grimling, Maria Szcześniak, Janusz Pluta, and Paweł Biernat. "THE ADSORPTION OF SIMVASTATIN ON CHITOSANS IN AN IN VITRO PHARMACEUTICAL MODEL." Progress on Chemistry and Application of Chitin and its Derivatives XXII (September 30, 2017): 151–58. http://dx.doi.org/10.15259/pcacd.22.15.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Rosli, Fatin Ahza, Haslina Ahmad, Khairulazhar Jumbri, Abdul Halim Abdullah, Sazlinda Kamaruzaman, and Nor Ain Fathihah Abdullah. "Efficient removal of pharmaceuticals from water using graphene nanoplatelets as adsorbent." Royal Society Open Science 8, no. 1 (January 2021): 201076. http://dx.doi.org/10.1098/rsos.201076.

Full text

Abstract:

Recently, pharmaceutical pollutants in water have emerged as a global concern as they give threat to human health and the environment. In this study, graphene nanoplatelets (GNPs) were used to efficiently remove antibiotics sulfamethoxazole (SMX) and analgesic acetaminophen (ACM) as pharmaceutical pollutants from water by an adsorption process. GNPs; C750, C300, M15 and M5 were characterized by high-resolution transmission electron microscopy, Raman spectroscopy, X-ray diffraction and Brunauer–Emmett–Teller. The effects of several parameters viz. solution pH, adsorbent amount, initial concentration and contact time were studied. The parameters were optimized by a batch adsorption process and the maximum removal efficiency for both pharmaceuticals was 99%. The adsorption kinetics and isotherms models were employed, and the experimental data were best analysed with pseudo-second kinetic and Langmuir isotherm with maximum adsorption capacity (Q m ) of 210.08 mg g −1 for SMX and 56.21 mg g −1 for ACM. A regeneration study was applied using different eluents; 5% ethanol-deionized water 0.005 M NaOH and HCl. GNP C300 was able to remove most of both pollutants from environmental water samples. Molecular docking was used to simulate the adsorption mechanism of GNP C300 towards SMX and ACM with a free binding energy of −7.54 kcal mol −1 and −5.29 kcal mol −1 , respectively, which revealed adsorption occurred spontaneously.

APA, Harvard, Vancouver, ISO, and other styles

7

Al-Nimry, Suhair S., Shereen M. Assaf, Ibrahim M. Jalal, and Naji M. Najib. "Adsorption of ketotifen onto some pharmaceutical excipients." International Journal of Pharmaceutics 149, no. 1 (April 1997): 115–21. http://dx.doi.org/10.1016/s0378-5173(96)04857-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Singh, G. N., and R. P. Gupta. "Adsorption Characteristics of Norfloxacin to Pharmaceutical Additives." Drug Development and Industrial Pharmacy 14, no. 13 (January 1988): 1845–54. http://dx.doi.org/10.3109/03639048809151991.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Al-Khateeb, Lateefa A., Sitah Almotiry, and Mohamad Abdel Salam. "Adsorption of pharmaceutical pollutants onto graphene nanoplatelets." Chemical Engineering Journal 248 (July 2014): 191–99. http://dx.doi.org/10.1016/j.cej.2014.03.023.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Feng, Zhaoxuan, Karin Odelius, Gunaratna Kuttuva Rajarao, and Minna Hakkarainen. "Microwave carbonized cellulose for trace pharmaceutical adsorption." Chemical Engineering Journal 346 (August 2018): 557–66. http://dx.doi.org/10.1016/j.cej.2018.04.014.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Benstoem, F., and J. Pinnekamp. "Characteristic numbers of granular activated carbon for the elimination of micropollutants from effluents of municipal wastewater treatment plants." Water Science and Technology 76, no. 2 (April 4, 2017): 279–85. http://dx.doi.org/10.2166/wst.2017.199.

Full text

Abstract:

Adsorption on granular activated carbon (GAC) is a promising step to extend existing treatment trains in municipal wastewater treatment plants (WWTPs) and, thus, to reduce the concentration of micropollutants (MPs) (e.g. pharmaceuticals) in wastewater. It is common practice to use characteristic numbers when choosing GAC for a specific application. In this study, characteristic numbers were correlated for five different GACs, with measured adsorption capacities of these carbons for three pharmaceutical MPs (carbamazepine, diclofenac and sulfamethoxazole) and dissolved organic carbon of a WWTP effluent. The adsorption capacities were measured using rapid small scale column tests. Density of GAC showed the highest correlation to adsorption of MP. All other characteristic numbers (iodine number, Brunauer–Emmett–Teller (BET) surface and methylene blue titre) are not suitable markers for choosing an appropriate activated carbon product for the elimination of MPs from municipal wastewater.

APA, Harvard, Vancouver, ISO, and other styles

12

Dickenson, E. R. V., and J. E. Drewes. "Quantitative structure property relationships for the adsorption of pharmaceuticals onto activated carbon." Water Science and Technology 62, no. 10 (November 1, 2010): 2270–76. http://dx.doi.org/10.2166/wst.2010.497.

Full text

Abstract:

Isotherms were determined for the adsorption of five pharmaceutical residues, primidone, carbamazepine, ibuprofen, naproxen and diclofenac, to Calgon Filtrasorb 300 powdered activated carbon (PAC). The sorption behavior was examined in ultra-pure and wastewater effluent organic matter (EfOM) matrices, where more sorption was observed in the ultra-pure water for PAC doses greater than 10 mg/L suggesting the presence of EfOM hinders the sorption of the pharmaceuticals to the PAC. Adsorption behaviors were described by the Freundlich isotherm model. Quantitative structure property relationships (QSPRs) in the form of polyparameter linear solvation energy relationships were developed for simulating the Freundlich adsorption capacity in both ultra-pure and EfOM matrices. The significant 3D-based descriptors for the QSPRs were the molar volume, polarizability and hydrogen-bond donor parameters.

APA, Harvard, Vancouver, ISO, and other styles

13

Eprikashvili, L. G., T. N. Kordzakhia, M. G. Zautashvili, I. M. Rubashvili, N. V. Pirtskhalava, M. A. Dzagania, and G. P. Tsintskaladze. "FEASIBILITY STUDY FOR THE USE OF NATURAL MORDENITE IN PURIFICATION PROCESSES OF WASTEWATERS FROM PHARMACEUTICAL POLLUTANTS." International Journal of Advanced Research 9, no. 03 (March 31, 2021): 683–91. http://dx.doi.org/10.21474/ijar01/12633.

Full text

Abstract:

The present research concerns the possibility of adsorptive removal of the frequently used antibiotics Ã¢Â€Â“ moxifloxacin and norfloxacin on natural zeolites Ã¢Â€Â“ mordenite and its acid-modified form from aqueous solutions. The adsorption of the above-mentioned antibiotics on the selected natural zeolite samples was investigated under static and dynamic conditions. Adsorption experiment under dynamic conditions carried out using the specially constructed dynamic type of laboratory equipment. Based on the data of chemical, IR spectroscopic, X-ray diffraction analyses, it has shown that when the zeolite adsorbent is treated with an acid, an equivalent exchange of extra framework cations for a hydrogen ion and dealumination occurs and silanol groups are formed at the same time. The increase in the adsorption activity of mordenite as a result of its treatment with acid is associated with an increase in the pore size due to the unblocking of the adsorbent aluminosilicate framework channels during dealumination.

APA, Harvard, Vancouver, ISO, and other styles

14

Wang, Teng, Yajun Zheng, Xiaoting Wang, Qiang Wang, Congyu Ke, Daniel E. Austin, Xiaoxiao Han, and Zhiping Zhang. "Abnormal adsorption and desorption behavior of pharmaceutical drugs on polystyrene microspheres." RSC Advances 7, no. 32 (2017): 19639–44. http://dx.doi.org/10.1039/c7ra01693j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Burke, Carl J., Bryan L. Steadman, David B. Volkin, Pei-Kuo Tsai, Mark W. Bruner, and C. Russell Middaugh. "The adsorption of proteins to pharmaceutical container surfaces." International Journal of Pharmaceutics 86, no. 1 (October 1992): 89–93. http://dx.doi.org/10.1016/0378-5173(92)90034-y.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Abe, Ikuo, Hiroshi Kamaya, and Issaku Ueda. "Adsorption of Local Anesthetics on Activated Carbon: Freundlich Adsorption Isotherms." Journal of Pharmaceutical Sciences 79, no. 4 (April 1990): 354–58. http://dx.doi.org/10.1002/jps.2600790418.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Chang, Po-Hsiang, Wei-Teh Jiang, Binoy Sarkar, Wendong Wang, and Zhaohui Li. "The Triple Mechanisms of Atenolol Adsorption on Ca-Montmorillonite: Implication in Pharmaceutical Wastewater Treatment." Materials 12, no. 18 (September 5, 2019): 2858. http://dx.doi.org/10.3390/ma12182858.

Full text

Abstract:

The adsorption of atenolol (AT) from aqueous solutions by Ca-montmorillonite (SAz-2) was investigated in batch studies under different physicochemical conditions. The AT existed in neutral un-dissociated form at pH 10, and was adsorbed on dioctahedral smectite (SAz-2) obeying the Langmuir isotherm with a maximum adsorption capacity of 330 mmol/kg. The kinetic adsorption suggested that both strong and weak adsorption sites existed on SAz-2 and participated in the adsorption mechanisms. The amount of exchangeable cations desorbed from SAz-2 during AT adsorption was linearly correlated with the amounts of adsorbed AT having slopes of 0.43, which implied that a cation exchange based adsorption mechanism was also in place. A comprehensive basal spacing change of SAz-2 was observed after AT adsorption on the clay mineral when tested with or without AT recrystallization. The intercalation of AT into the SAz-2 interlayers did not result in swelling due to the low adsorption capacity of the drug. Prominent interactions between the pharmaceutical molecule and SAz-2 were evidenced by apparent shifts of the infrared absorption bands after adsorption. The interlayer configurations and hydrogen bonding of AT on SAz-2 were also supported by infrared, X-ray diffraction and thermogravimetric analyses. This study suggested that SAz-2 is an excellent material to remove not only AT from pharmaceutical wastewater, but can potentially remove many other β-receptor blocker drugs. The results helped us to understand the possible interlayer configurations and adsorption mechanisms of the drugs on natural clay mineral based adsorbents.

APA, Harvard, Vancouver, ISO, and other styles

18

Polak, Daniel, Izabela Zielińska, Maciej Szwast, Igor Kogut, and Artur Małolepszy. "Modification of Ceramic Membranes with Carbon Compounds for Pharmaceutical Substances Removal from Water in a Filtration—Adsorption System." Membranes 11, no. 7 (June 28, 2021): 481. http://dx.doi.org/10.3390/membranes11070481.

Full text

Abstract:

The aim of this work is to develop a new type of carbon-ceramic membranes for the removal of pharmaceutical substances from water. The membranes were prepared by the chemical modification method using an organosilicon precursor—octadecyltrichlorosilane (ODTS). Graphene oxide, multi-walled carbon nanotubes with carboxylic groups, and single-walled carbon nanotubes were used in the modification process. The filtration properties and adsorption properties of the developed membranes were tested. In order to characterize the membrane, the water permeability, the change of the permeate flux in time, and the adsorbed mass of the substance were determined. Additionally, the surface properties of the membranes were characterized by contact angle measurements and porosimetry. The antibiotic tetracycline was used in the adsorption tests. Based on the results, the improved adsorption properties of the modified membrane in relation to the unmodified membrane were noticed. Novel ceramic membranes modified with MWCNT are characterized by 45.4% removal of tetracycline and permeate flux of 520 L·h·m−2·bar−1. We demonstrated the ability of modified membranes to adsorb pharmaceuticals from water streams that are in contact with the membrane. Novel membranes retain their filtration properties. Therefore, such membranes can be used in an integrated filtration–adsorption process.

APA, Harvard, Vancouver, ISO, and other styles

19

Weber, Caroline Trevisan, Gabriela Carvalho Collazzo, Marcio Antonio Mazutti, Edson Luiz Foletto, and Guilherme Luiz Dotto. "Removal of hazardous pharmaceutical dyes by adsorption onto papaya seeds." Water Science and Technology 70, no. 1 (April 23, 2014): 102–7. http://dx.doi.org/10.2166/wst.2014.200.

Full text

Abstract:

Papaya (Carica papaya L.) seeds were used as adsorbent to remove toxic pharmaceutical dyes (tartrazine and amaranth) from aqueous solutions, in order to extend application range. The effects of pH, initial dye concentration, contact time and temperature were investigated. The kinetic data were evaluated by the pseudo first-order, pseudo second-order and Elovich models. The equilibrium was evaluated by the Langmuir, Freundlich and Temkin isotherm models. It was found that adsorption favored a pH of 2.5, temperature of 298 K and equilibrium was attained at 180–200 min. The adsorption kinetics followed the pseudo second-order model, and the equilibrium was well represented by the Langmuir model. The maximum adsorption capacities were 51.0 and 37.4 mg g−1 for tartrazine and amaranth, respectively. These results revealed that papaya seeds can be used as an alternative adsorbent to remove pharmaceutical dyes from aqueous solutions.

APA, Harvard, Vancouver, ISO, and other styles

20

Veclani, Daniele, Marilena Tolazzi, and Andrea Melchior. "Molecular Interpretation of Pharmaceuticals’ Adsorption on Carbon Nanomaterials: Theory Meets Experiments." Processes 8, no. 6 (May 27, 2020): 642. http://dx.doi.org/10.3390/pr8060642.

Full text

Abstract:

The ability of carbon-based nanomaterials (CNM) to interact with a variety of pharmaceutical drugs can be exploited in many applications. In particular, they have been studied both as carriers for in vivo drug delivery and as sorbents for the treatment of water polluted by pharmaceuticals. In recent years, the large number of experimental studies was also assisted by computational work as a tool to provide understanding at molecular level of structural and thermodynamic aspects of adsorption processes. Quantum mechanical methods, especially based on density functional theory (DFT) and classical molecular dynamics (MD) simulations were mainly applied to study adsorption/release of various drugs. This review aims to compare results obtained by theory and experiments, focusing on the adsorption of three classes of compounds: (i) simple organic model molecules; (ii) antimicrobials; (iii) cytostatics. Generally, a good agreement between experimental data (e.g. energies of adsorption, spectroscopic properties, adsorption isotherms, type of interactions, emerged from this review) and theoretical results can be reached, provided that a selection of the correct level of theory is performed. Computational studies are shown to be a valuable tool for investigating such systems and ultimately provide useful insights to guide CNMs materials development and design.

APA, Harvard, Vancouver, ISO, and other styles

21

Chang, E. E., Jan-Chi Wan, Hyunook Kim, Chung-Huei Liang, Yung-Dun Dai, and Pen-Chi Chiang. "Adsorption of Selected Pharmaceutical Compounds onto Activated Carbon in Dilute Aqueous Solutions Exemplified by Acetaminophen, Diclofenac, and Sulfamethoxazole." Scientific World Journal 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/186501.

Full text

Abstract:

The adsorption of three pharmaceuticals, namely, acetaminophen, diclofenac, and sulfamethoxazole onto granular activated carbon (GAC), was investigated. To study competitive adsorption, both dynamic and steady-state adsorption experiments were conducted by careful selection of pharmaceuticals with various affinities and molecular size. The effective diffusion coefficient of the adsorbate was increased with decease in particle size of GAC. The adsorption affinity represented as Langmuir was consistent with the ranking of the octanol-water partition coefficient,Kow. The adsorption behavior in binary or tertiary systems could be described by competition adsorption. In the binary system adsorption replacement occurred, under which the adsorbate with the smallerKowwas replaced by the one with largerKow. Results also indicated that portion of the micropores could be occupied only by the small target compound, but not the larger adsorbates. In multiple-component systems the competition adsorption might significantly be affected by the macropores and less by the meso- or micropores.

APA, Harvard, Vancouver, ISO, and other styles

22

Muster, Tim H., and Clive A. Prestidge. "Water Adsorption Kinetics and Contact Angles of Pharmaceutical Powders." Journal of Pharmaceutical Sciences 94, no. 4 (April 2005): 861–72. http://dx.doi.org/10.1002/jps.20296.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Mollmann, Susanne H., Lene Jorgensen, Jens T. Bukrinsky, Ulla Elofsson, Willem Norde, and Sven Frokjaer. "Interfacial adsorption of insulin." European Journal of Pharmaceutical Sciences 27, no. 2-3 (February 2006): 194–204. http://dx.doi.org/10.1016/j.ejps.2005.09.010.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Finn, Michelle, Gabrielle Giampietro, David Mazyck, and Regina Rodriguez. "Activated Carbon for Pharmaceutical Removal at Point-of-Entry." Processes 9, no. 7 (June 23, 2021): 1091. http://dx.doi.org/10.3390/pr9071091.

Full text

Abstract:

Pharmaceuticals are an increasing problem in waterways due to improper disposal and lack of removal at wastewater treatment plants. Long-term exposure impacts to humans are unknown but have been observed in model organisms (i.e., fish), impacting reproduction, changing temperament, and causing organ damage. The application of activated carbon (AC) for organic contaminant removal is widespread and applied successfully for water treatment. The objective of this study is to rapidly adsorb ibuprofen using AC to determine the feasibility as a point-of-entry treatment option for removal of pharmaceuticals in the toilet. AC factors analyzed include type of AC raw material, adsorbent particle size, contact time, and competitive adsorption of ibuprofen and common toilet bowl cleaner components such as chlorine and methylene blue dye. A coconut-based AC with a high surface area adsorbed the highest quantity of ibuprofen. There was no significant impact to ibuprofen adsorption upon the introduction of other compounds to the solution, thus demonstrating rapid adsorption and the potential for application at the point-of-entry.

APA, Harvard, Vancouver, ISO, and other styles

25

Bernal, Valentina, Liliana Giraldo, and Juan Moreno-Piraján. "Physicochemical Properties of Activated Carbon: Their Effect on the Adsorption of Pharmaceutical Compounds and Adsorbate–Adsorbent Interactions." C 4, no. 4 (November 19, 2018): 62. http://dx.doi.org/10.3390/c4040062.

Full text

Abstract:

The adsorption of salicylic acid, acetaminophen, and methylparaben (pharmaceutical products derived from phenol) on carbons activated with different surface chemistries was carried out. We evaluated the effect of the physicochemical properties of the adsorbent and adsorbates on the adsorption capacity. A study of the adsorbate–adsorbent interactions via immersion calorimetry in the analytes solutions at different concentrations was included, in addition to the equilibrium data analysis. The results show that the pharmaceutical compounds (2.28–0.71 mmol g−1) have lower adsorption capacities in the activated carbon with the highest content of oxygenated groups (acids), while the activated carbons with amphoteric characteristics increase the capacities of adsorption (2.60–1.38 mmol g−1). This behavior may be associated with the increased affinity between the adsorbent and solvent due to the presence of polar groups, which was corroborated by the high immersion enthalpy value in water (ΔHimmH2O = −66.6 J g−1). The equilibrium data, adjusted to the Freundlich adsorption model, indicated that the heterogeneous adsorption processes involve immersion enthalpy values between −9.42 and −24.3 J g−1.

APA, Harvard, Vancouver, ISO, and other styles

26

Кrasnova, Tamara, Natalia Gora, and Nadezhda Golubeva. "Development of Environmentally Safe Pharmaceutical Treatment Technology of Urban Territories Wastewater." MATEC Web of Conferences 193 (2018): 02022. http://dx.doi.org/10.1051/matecconf/201819302022.

Full text

Abstract:

At present, one of the most important problems is the growing of environment pollution of Urban Development. Wastewater treatment generated in the manufacture of medicines and biologically active additives is of great importance for water bodies' sanitary protection. The sorption method provides a high degree of weakly concentrated wastewater purification, the absence of secondary pollution and the possibility of returning valuable components and water to the production. The purpose of the study was to develop an adsorption technology for wastewater treatment in the pharmaceutical industry containing flavonoids using semi-coke. Results of the study: The results of complex studies of the flavonoids - quercetin adsorption and rutin on active charcoals differing in raw materials, method of production, structure and chemistry of the surface are presented. The main equilibrium, kinetic and dynamic process parameters are calculated for engineering calculations. Importance of the research: The technology of wastewater adsorption treatment from pharmaceutical industries with subsequent regeneration of active coals is proposed, which will provide protection against water pollution and resource saving. The performed work showed the prospects of using the semi-coke "Puroolat-Standard", which is characterized by higher adsorption capacity and lower cost

APA, Harvard, Vancouver, ISO, and other styles

27

Liakos, Efstathios V., Maria Lazaridou, Georgia Michailidou, Ioanna Koumentakou, Dimitra A. Lambropoulou, Dimitrios N. Bikiaris, and George Z. Kyzas. "Chitosan Adsorbent Derivatives for Pharmaceuticals Removal from Effluents: A Review." Macromol 1, no. 2 (May 11, 2021): 130–54. http://dx.doi.org/10.3390/macromol1020011.

Full text

Abstract:

Chitin is mentioned as the second most abundant and important natural biopolymer in worldwide scale. The main sources for the extraction and exploitation of this natural polysaccharide polymer are crabs and shrimps. Chitosan (poly-β-(1 → 4)-2-amino-2-deoxy-d-glucose) is the most important derivative of chitin and can be used in a wide variety of applications including cosmetics, pharmaceutical and biomedical applications, food, etc., giving this substance high value-added applications. Moreover, chitosan has applications in adsorption because it contains amino and hydroxyl groups in its molecules, and can thus contribute to many possible adsorption interactions between chitosan and pollutants (pharmaceuticals/drugs, metals, phenols, pesticides, etc.). However, it must be noted that one of the most important techniques of decontamination is considered to be adsorption because it is simple, low-cost, and fast. This review emphasizes on recently published research papers (2013–2021) and briefly describes the chemical modifications of chitosan (grafting, cross-linking, etc.), for the adsorption of a variety of emerging contaminants from aqueous solutions, and characterization results. Finally, tables are depicted from selected chitosan synthetic routes and the pH effects are discussed, along with the best-fitting isotherm and kinetic models.

APA, Harvard, Vancouver, ISO, and other styles

28

KIES, Fairouz Khalida, Sihem Boutchebak, and Nesrine Bendaida. "Soil Contamination by Pharmaceutical Pollutants: Adsorption of an Antibiotic (Amoxicillin) on an Agricultural Land." Proceedings 30, no. 1 (May 19, 2020): 60. http://dx.doi.org/10.3390/proceedings2019030060.

Full text

Abstract:

Antibiotics are prescribed in human and veterinary medicine for the treatment of infectious diseases. They are also widely used for animal farming, aquaculture and agriculture. Antibiotics are not fully absorbed and metabolized and are therefore, often excreted unmodified. As sewage plants are not equipped to remove these drugs from wastewater, antibiotics may be discharged into the environment and reach the soil in many ways. The pharmaceutical industry, hospital and municipal wastewater containing antibiotics may be used for irrigation and animal manure, whilst sewage sludge and biosolids are frequently used as fertilizers for agricultural lands. This allows antibiotics to contaminate soil, ground water and the entire food chain. The major concern about antibiotics in the environment is their contribution to the resistance development in human and animal pathogens that can lead to a serious threat to human health. There are several procedures that determine the fate of antibiotics in soil such as transport, leaching, plant uptake, photodegradation, biodegradation and adsorption. The adsorption of these drugs into the soil depends on its physico-chemical characteristics (Cation Exchange Capacity, pH, permeability, iron oxide content, etc.), texture, organic matter and climate conditions. However, the assessment of the literature shows that more studies need to be carried out on the occurrence, fate and risks associated with antibiotics in the soil. For this purpose, the adsorption of an antibiotic widely used in human and veterinary medicine (amoxicillin) in an agricultural soil was studied. This experimental study was carried out in order to investigate the influence of several parameters: the contact time, the initial antibiotic concentration, the pH and the temperature on the contamination risk of soil by adsorption. These experiments showed that the adsorption of amoxicillin in soil is rapid. For a liquid/solid ratio of 10 L/kg and an initial antibiotic concentration of 10 ppm, the adsorption equilibrium was reached within 20 minutes and the maximum amount of amoxicillin adsorbed was of 23 mg/kg. The adsorption kinetics were well described by the pseudo-first-order model and exhibited a three-stage intra-particle diffusion mode. The adsorption capacity of soil increased with the initial antibiotic concentration (from 10 to 100 ppm) and the relative adsorption isotherm (type II) was in accordance with the Guggenheim-Anderson-deBroer model. The adsorption of amoxicillin was improved in the acidic medium. The thermodynamic study showed that the adsorption of amoxicillin in soil was a physical process. The overall study shows that amoxicillin is a potential contaminant for soil.

APA, Harvard, Vancouver, ISO, and other styles

29

Wesemeyer, H., B. W. Müller, and R. H. Müller. "Adsorption of ethoxylated surfactants on nanoparticles. II. Determination of adsorption enthalpy by microcalorimetry." International Journal of Pharmaceutics 89, no. 1 (January 1993): 33–40. http://dx.doi.org/10.1016/0378-5173(93)90305-y.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Higgins, Carlyn J., and Steven J. Duranceau. "Removal of Enantiomeric Ibuprofen in a Nanofiltration Membrane Process." Membranes 10, no. 12 (November 30, 2020): 383. http://dx.doi.org/10.3390/membranes10120383.

Full text

Abstract:

A study of the behavior of R- and S-enantiomers of ibuprofen (R-IBU and S-IBU) in aqueous solution by nanofiltration (NF) membranes revealed that up to 23% of the pharmaceutical was adsorbed onto the stainless steel equipment of a flat-sheet experimental unit. Mass balances disclosed that IBU’s S-enantiomer was primarily responsible for the adsorption onto the equipment. Additional IBU adsorption was also experienced on the NF membrane coupons, verified by increased contact angle measurements on the surfaces. The IBU-equipment adsorptive relationship with and without the membrane coupon were best described by Freundlich and Langmuir isotherms, respectively. At a feed water pH of 4.0 units and racemic µg/L IBU concentrations, NF removal ranged from 34.5% to 49.5%. The rejection of S-IBU was consistently greater than the R-enantiomer. Adsorption onto the surfaces influenced NF rejection by 18.9% to 27.3%. The removal of IBU displayed a direct relationship with an increase in feed water pH. Conversely, the adsorption of IBU exhibited an indirect relationship with an increase in feed water pH.

APA, Harvard, Vancouver, ISO, and other styles

31

Abouzeid, Fatma M., and Sultanah Alshammery. "Copper Electropolishing in Phosphoric Acid under Normal and Forced Convection Conditions in Presence of Some Pharmaceutical Drugs." Asian Journal of Chemistry 32, no. 4 (February 25, 2020): 912–22. http://dx.doi.org/10.14233/ajchem.2020.22501.

Full text

Abstract:

Some pharmaceutical drugs namely valsartan, hydrocholorothiazide, erythromycin thiocynate and diclofenac potassium were studied as chemical additions for enhancing the finished copper surface attained. Anode potential-limiting current relationship was measured and comparing of gradually increasing pharmaceutical compound concentrations (from 1 × 10-4 to 7 × 10-4 M). Copper dissolution behaviour in presence of pharmaceutical compounds was studied under natural convection [rotating cylinder (RCE) and rotating disc electrode (RDE)] as forced convection. The limiting current was found to diminish with enlarging additives concentration and increase with increasing temperature (293-313 K). Activation energies values confirm that reaction rate was diffusion controlled. The results showed that the improvement produced in electropolishing in presence of pharmaceutical compounds occurs through adsorption of their molecules above metal surface. All the pharmaceutical compounds adsorption process obey kinetic-thermodynamic model. The data under different conditions were controlled by dimensionless correlations viz. Sherwood, Schmidt and Reynolds numbers. Surface morphology also confirmed that an addition of pharmaceutical compound to copper dissolution bath enhance surface appearance and its texture quality to great extent.

APA, Harvard, Vancouver, ISO, and other styles

32

Choina, J., H. Duwensee, G. Flechsig, H. Kosslick, A. Morawski, V. Tuan, and A. Schulz. "Removal of hazardous pharmaceutical from water by photocatalytic treatment." Open Chemistry 8, no. 6 (December 1, 2010): 1288–97. http://dx.doi.org/10.2478/s11532-010-0109-9.

Full text

Abstract:

AbstractThe photocatalytic abatement of hazardous pharmaceuticals has been investigated at very low concentration in the ppb range as found in wastewater and in environmental pollutants. Photocatalytic degradation of tetracycline as a model compound with titania catalysts has been studied using solarium UV-A and black light with differentially applied electric power, tetracycline and catalyst concentration. Abatement of up to 90% has been achieved after 1 hour. Adsorption of tetracycline and photochemical degradation contribute significantly to the abatement of tetracycline resulting in an immediate reduction during the initial period of treatment. Contribution of adsorption is high at very low concentration (500 ppb). Photocatalytic treatment with titania is even highly efficient in the abatement of very small concentrations of tetracycline in drinking water.

APA, Harvard, Vancouver, ISO, and other styles

33

Meler, Jan, Bożena Grimling, Maria Szcześniak, Bożena Karolewicz, and Paweł Biernat. "ATORVASTATIN ADSORPTION STUDIES ON CHITOSANS IN AN in vitro PHARMACEUTICAL MODEL." Progress on Chemistry and Application of Chitin and its Derivatives XXIII (September 10, 2018): 140–48. http://dx.doi.org/10.15259/pcacd.23.014.

Full text

Abstract:

During the pharmacological therapy of specific diseases, drugs are used which, with other preparations or foods, can create connections, in many cases changing or even blocking their action. On the other hand, the use of unsuitable polymers as excipients may result in drug-polymer incompatibilities. Interactions consisting mainly of the occurrence of the adsorption phenomenon and on the formation of complex bonds that reduce the effect of the drugs are of particular importance. The aim of the study was to investigate whether the active substance atorvastatin is incompatible with dietary supplements containing chitosan. The phenomenon of the adsorption of the drug was examined using a static model of a pharmaceutical gastrointestinal tract, in the concentration range generally ingested in a single dose. Measurement results of the amount of bound drug were used to determine the average percentage of adsorbed drug dose. The results of the study prove that the anticholinesterase drug is adsorbed on chitosan in the pH ranges used, and that the binding capacity depends on the chitosan variety, which indirectly affects the reaction of the environment. It was observed that the average size of sorption depending on the chitosan variety ranged from 38% to 86%. The fact that the lowest value of adsorption was at pH 6.4 can be explained by the chemical properties of chitosan, which shows a charge only at pH >6.7. Under such conditions, the phenomenon of electrostatic adsorption may occur in relation to the healing substances of weak acids. At a pH above 7.6, corresponding to the intestinal fluid-filled intestine, the mean sorption for the highest dose of chitosan was from 38–86%. The increase in the adsorbed amount of anticholinesterase drugs on the polymer along with the increase in pH from 7.6 to 8.0 can be explained by the chitosan swelling properties, which increase with an increase in the pH. As a result, the specific surface area of the polymer and its sorption capacity increase. Based on the above considerations, it can be concluded that there is an antagonistic interaction between the drug and the polymer studied, which involves the adsorption of a drug from this group on the polymer (chitosan) and a decrease in its bioavailability.

APA, Harvard, Vancouver, ISO, and other styles

34

Lee, P. I. "Polymer adsorption and dispersion stability." Journal of Controlled Release 1, no. 4 (June 1985): 319. http://dx.doi.org/10.1016/0168-3659(85)90008-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Hanbali, Ghadir, Shehdeh Jodeh, Othman Hamed, Roland Bol, Bayan Khalaf, Asma Qdemat, and Subhi Samhan. "Enhanced Ibuprofen Adsorption and Desorption on Synthesized Functionalized Magnetic Multiwall Carbon Nanotubes from Aqueous Solution." Materials 13, no. 15 (July 27, 2020): 3329. http://dx.doi.org/10.3390/ma13153329.

Full text

Abstract:

In recent years, concerns have been raised about the occurrence of active raw materials and pharmaceutical ingredients that may be present in water, including wastewater, in the pharmaceutical industry. Wastewater treatment methods are not enough to completely remove active pharmaceuticals and other waste; thus, this study aims to assess the use of a multiwall carbon nanotube after derivatization and magnetization as a new and renewable absorbent for removing ibuprofen from an aqueous medium. The adsorbents were prepared by first oxidizing a multiwall carbon nanotube and then deriving the oxidized product with hydroxyl amine (m-MWCNT–HA), hydrazine (m-MWCNT–HYD), and amino acid (m-MWCNT–CYS). Adsorbents were characterized by Raman spectroscopy, Fourier Transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM and TEM), Brunauer–Emmett–Teller surface area analysis (BET), thermogravimetric analysis (TGA), and vibrating sample magnetometer (VSM). Batch adsorption studies were conducted to study the effects of pH, temperature, time, and initial concentration of the adsorbate. Adsorption isotherm, kinetics, and thermodynamics studies were also conducted. The results show that the optimal pH for nearly complete removal of Ibu in a short time at room temperature was 4 for three adsorbents. The adsorption followed the Langmuir isotherm model with pseudo-second-order kinetics. The percentage of removal of ibuprofen reached up to 98.4%, 93%, and 61.5% for m-MWCNT–CYS, m-MWCNT–HYD, and m-MWCNT–HA respectively. To the best of our knowledge, the grafted MWCNTs presented in this work comprise the first example in the literature of oxidized MWCNT modified with such functionalities and applied for ibuprofen removal.

APA, Harvard, Vancouver, ISO, and other styles

36

Akaho, Eiichi, and Yoshinobu Fukumori. "Studies on adsorption characteristics and mechanism of adsorption of chlorhexidine mainly by carbon black." Journal of Pharmaceutical Sciences 90, no. 9 (September 2001): 1288–97. http://dx.doi.org/10.1002/jps.1081.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Yaseen, Ahmed Taha, and Liqa’a Hussein Alwan. "Thermodynamic Study of Adsorption of Tamoxifen Drug on Activated Nano-Coal Particles prepared from Stem of Eucalyptus and its Diagnosis by different Techniques." International Journal of Drug Delivery Technology 10, no. 03 (September 25, 2020): 328–31. http://dx.doi.org/10.25258/ijddt.10.3.3.

Full text

Abstract:

The research included preparing nano-activated charcoal from the stem of the eucalyptus trees. The prepared nano-coal particles were diagnosed using various techniques, such as, transmission electron microscopy (TEM), and energy-dispersive X-ray (EDX) technology. The research included a spectroscopic study of the adsorption of tamoxifen on the prepared nano-coal, and the results showed that the appropriate concentration is 2.5 × 10-5 molar, with an appropriate weight of the adsorbent material which is 0.4-gram, the time of equilibrium is 40 minutes, and the percentage of adsorption efficiency increases with passing time, the adsorption process is dependent to a second-degree equation, according to the correlation coefficient (R2), which gave the value of 0.9999. Thermodynamic functions were calculated for the adsorption process at different temperatures (17.5, 27.5, 37.5, and 47.5ºC), and it was found that the adsorption process is a heat emission process (ΔH negative), the adsorption is physical because it is less than 40 kJ/mol, and the free energy is negative (ΔG), and entropy adsorption was negative (ΔS), meaning less random.

APA, Harvard, Vancouver, ISO, and other styles

38

Cruceanu, Anca, Monica Alexandra Vaideanu, Rodica Zavoianu, Elena Bacalum, and Octavian Dumitru Pavel. "Conversion of lignocellulosic agricultural wastes into adsorbents for pharmaceutical drugs." SIMI 2019, Abstract Book, SIMI 2019 (September 20, 2019): 24–31. http://dx.doi.org/10.21698/simi.2019.fp02.

Full text

Abstract:

Lignocellulosic agricultural wastes e.g. corn cobs, straws and corn stalks were converted into carbonaceous adsorbents using a sequence of thermal and chemical activation processes. The derived solids obtained after each type of activation were characterized by determination of fix carbon content, iodine number, Boehm titration and DRIFT spectrometry. The results obtained at the adsorption tests were well correlated to those of the characterization, showing that the most promising adsorbents for amoxicillin removal were those submitted to a thermal treatment followed by a chemical alkaline activation, followed by washing and a secondary thermal treatment. The most promising bio-based adsorbent was the one derived from corn stalks (90.6% adsorption efficiency).

APA, Harvard, Vancouver, ISO, and other styles

39

Mojiri, Amin, Reza Andasht Kazeroon, and Ali Gholami. "Cross-Linked Magnetic Chitosan/Activated Biochar for Removal of Emerging Micropollutants from Water: Optimization by the Artificial Neural Network." Water 11, no. 3 (March 17, 2019): 551. http://dx.doi.org/10.3390/w11030551.

Full text

Abstract:

One of the most important types of emerging micropollutants is the pharmaceutical micropollutant. Pharmaceutical micropollutants are usually identified in several environmental compartments, so the removal of pharmaceutical micropollutants is a global concern. This study aimed to remove diclofenac (DCF), ibuprofen (IBP), and naproxen (NPX) from the aqueous solution via cross-linked magnetic chitosan/activated biochar (CMCAB). Two independent factors—pH (4–8) and a concentration of emerging micropollutants (0.5–3 mg/L)—were monitored in this study. Adsorbent dosage (g/L) and adsorption time (h) were fixed at 1.6 and 1.5, respectively, based on the results of preliminary experiments. At a pH of 6.0 and an initial micropollutant (MP) concentration of 2.5 mg/L, 2.41 mg/L (96.4%) of DCF, 2.47 mg/L (98.8%) of IBP, and 2.38 mg/L (95.2%) of NPX were removed. Optimization was done by an artificial neural network (ANN), which proved to be reasonable at optimizing emerging micropollutant elimination by CMCAB as indicated by the high R2 values and reasonable mean square errors (MSE). Adsorption isotherm studies indicated that both Langmuir and Freundlich isotherms were able to explain micropollutant adsorption by CMCAB. Finally, desorption tests proved that cross-linked magnetic chitosan/activated biochar might be employed for at least eight adsorption-desorption cycles.

APA, Harvard, Vancouver, ISO, and other styles

40

Jasim, Layth S., Waleed K. Abdulsahib, Safaa H. Ganduh, and Nadher D. Radia. "New Approach for Sulfadiazine Toxicity Management using Carboxymethyl Cellulose Grafted Acrylamide Hydrogel." International Journal of Drug Delivery Technology 10, no. 02 (June 25, 2020): 259–64. http://dx.doi.org/10.25258/ijddt.10.2.13.

Full text

Abstract:

Sulfadiazine (SZ), a small molecule sulfonamide that also named a 2-sulfanilamido-pyrimidine. SZ is an artificial bacteriostatic antibiotic through a widespread spectrum counter to numerous gram-negative and gram-positive bacteria. Sulfonamide antibiotics frequently identified in the earthly and water environment, but little acknowledgment about abiotic deprivation of these antibiotics. The SZ adsorption from aqueous solution studied in the present experiment utilizing carboxymethyl cellulose (CMC) grafted acrylamide (AM) hydrogel as an adsorbent. Effect of time-related to equilibrium, salts, temperature, and pH value was accomplished using kinetics and thermodynamic studies. Fourier-transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM) analysis accomplished for CMC-g-AM hydrogel before and after SZ adsorption. The study showed higher adsorption of the SZ on these hydrogels, and the degrees of SZ adsorption on the hydrogels decreased with increasing temperature (exothermic process). Adsorbed quantity of SZ on the surface was declined as the pH augmented. KCl’s influence on adsorption is more than that of NaCl, and the CaCO3 is more than of KCl. Spontaneous and feasible adsorption takes place, and adsorption of SZ on hydrogel fits well with the Freundlich model.

APA, Harvard, Vancouver, ISO, and other styles

41

Umprayn, Kaisri, and R. W. Mendes. "Hygroscopicity and Moisture Adsorption Kinetics of Pharmaceutical Solids: A Review." Drug Development and Industrial Pharmacy 13, no. 4-5 (January 1987): 653–93. http://dx.doi.org/10.3109/03639048709105213.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Mellah, Abdelkarim, Soraia P. S. Fernandes, Ramón Rodríguez, José Otero, Jairo Paz, Jacobo Cruces, Dana D. Medina, Harik Djamila, Begoña Espiña, and Laura M. Salonen. "Adsorption of Pharmaceutical Pollutants from Water Using Covalent Organic Frameworks." Chemistry - A European Journal 24, no. 42 (July 9, 2018): 10601–5. http://dx.doi.org/10.1002/chem.201801649.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Liu, Dan, Weiwei Lei, Si Qin, Karel D. Klika, and Ying Chen. "Superior adsorption of pharmaceutical molecules by highly porous BN nanosheets." Physical Chemistry Chemical Physics 18, no. 1 (2016): 84–88. http://dx.doi.org/10.1039/c5cp06399j.

Full text

Abstract:

Porous boron nitride nanosheets (BNNSs) are able to adsorb pharmaceuticals from aqueous solution with very high capacities. Regeneration is simple and performance maintained providing excellent recyclability of the material.

APA, Harvard, Vancouver, ISO, and other styles

44

Nagase, Kenichi, Jun Kobayashi, Akihiko Kikuchi, Yoshikatsu Akiyama, Hideko Kanazawa, and Teruo Okano. "Thermally-modulated on/off-adsorption materials for pharmaceutical protein purification." Biomaterials 32, no. 2 (January 2011): 619–27. http://dx.doi.org/10.1016/j.biomaterials.2010.09.012.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Cristóvão, Raquel O., Mafalda R. Almeida, Maria A. Barros, João C. F. Nunes, Rui A. R. Boaventura, José M. Loureiro, Joaquim L. Faria, et al. "Development and characterization of a novel l-asparaginase/MWCNT nanobioconjugate." RSC Advances 10, no. 52 (2020): 31205–13. http://dx.doi.org/10.1039/d0ra05534d.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Goyal, Ankita, Diksha Aggarwal, Surbhi Kapoor, Neetu Goel, Sonal Singhal, and Jaya Shukla. "A comprehensive experimental and theoretical study on BN nanosheets for the adsorption of pharmaceutical drugs." New Journal of Chemistry 44, no. 10 (2020): 3985–97. http://dx.doi.org/10.1039/c9nj06029d.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Rashid, Jamshaid, Faryal Saleemi, Bilal Akram, Lin Wang, Naveed Hussain, and Ming Xu. "Facile Synthesis of g-C3N4/MoO3 Nanohybrid for Efficient Removal of Aqueous Diclofenac Sodium." Nanomaterials 11, no. 6 (June 14, 2021): 1564. http://dx.doi.org/10.3390/nano11061564.

Full text

Abstract:

Graphitic carbon nitride modified by molybdenum trioxide (g-C3N4/MoO3) as a nanohybrid was synthesized by co-precipitation method. Here, g-C3N4/MoO3 nanohybrid was used for the first time as an adsorbent for the pharmaceutical drug, diclofenac, (an aqueous micropollutant) from water to mitigate its possible environmental toxic effects. Compared to pristine components, the nanohybrid exhibited better adsorptive removal of diclofenac. Adsorption was enhanced with increment in MoO3 content from 1 to 3 wt %; however further increment in MoO3 content resulted in lower adsorption capacity due to agglomeration of MoO3 particles over g-C3N4. 162 mg g−1 adsorption capacity was achieved for 300 mg L−1 diclofenac in solution with 1 g L−1 adsorbent at pH = 6. Adsorption of diclofenac over g-C3N4 /MoO3 followed pseudo 2nd order kinetics. Temkin, Langmuir, Dubinin Radushkevich and Freundlich isotherm models were applied on the experimental results concluding that diclofenac adsorption over g-C3N4/MoO3 followed the Langmuir isotherm. The adsorption mechanism could be explained by the π–π interaction between aromatic rings of diclofenac and g-C3N4/MoO3 (3%) nanohybrid, which is also evident by the FTIR results. This study presents the facile fabrication of a 2nd generation adsorbent for the treatment of diclofenac contaminated water that may as well help achieve the removal of other micropollutants form water.

APA, Harvard, Vancouver, ISO, and other styles

48

Lin, Lin, Heda Guan, Donglei Zou, Zhaojun Dong, Zhi Liu, Feifan Xu, Zhigang Xie, and Yangxue Li. "A pharmaceutical hydrogen-bonded covalent organic polymer for enrichment of volatile iodine." RSC Advances 7, no. 86 (2017): 54407–15. http://dx.doi.org/10.1039/c7ra09414k.

Full text

Abstract:

A pharmaceutical hydrogen-bonded covalent organic polymer (pha-H_COP-1) is constructed with the formation of two types of bonds using the pharmaceutical isoniazid as a bifunctional linker. The as-synthesised pha-H_COP-1 exhibits good adsorption ability for iodine molecules.

APA, Harvard, Vancouver, ISO, and other styles

49

Шанова, O. Shanova, Григорьев, L. Grigorev, Веренцова, and L. Verentsova. "Wastewater Purification from Streptomycin Through Adsorption Method." Safety in Technosphere 4, no. 2 (April 25, 2015): 62–66. http://dx.doi.org/10.12737/11334.

Full text

Abstract:

Data on adsorption from aqueous streptomycin solution in static and dynamic conditions for the activated carbon obtained from plant waste of pharmaceutical production is provided. It is displayed that the calculation of the equilibrium values of adsorption and the duration of the process at a concentration of streptomycin less than 200 mg·dm–3 can be performed with sufficient accuracy using equations of, respectively, Dubinin — Radushkevich and Dubinin — Nikolaev.

APA, Harvard, Vancouver, ISO, and other styles

50

Begum, Hosne Ara, Md Ariful Islam, and Tanvir Muslim. "Equilibrium and Kinetic Studies of Adsorption of Aqueous Crystal Violet by Peanut Shells." Bangladesh Pharmaceutical Journal 17, no. 2 (February 21, 2015): 163–71. http://dx.doi.org/10.3329/bpj.v17i2.22335.

Full text

Abstract:

In the present study, the ability of a non-conventional biosorbent, peanut shells (PnS) for the removal of crystal violet (CV), a cationic dye, from aqueous solution was evaluated. The surface zero point charge (pHzpc) of peanut shells was estimated and found to be 6.27. Batch adsorption experiments were performed and system variables were investigated including contact time, initial dye concentration, temperature and pH of the solution. The estimated equilibrium time was found to be 4 hours. The adsorption of CV on PnS was found to increase with the increment of initial concentration of CV solution and pH of the medium. The equilibrium adsorption data were fitted to the Langmuir and Freunlich isotherms. The best result was achieved with Langmuir isotherm model. The adsorption rates were found to be consistent with a pseudo-second-order model. The result showed that the amount of CV adsorbed decreased with the increase of temperature. It suggested that the adsorption occurred due to physical interaction and it was favorable at lower temperature. The value of activation energy Ea (11.27 kJ mol?1) revealed that adsorption process was spontaneous and exothermic in nature. The adsorption of crystal violet by peanut shell suggests that this adsorbent may be evaluated for removal of other dyes produced and/or used in pharmaceutical process industries. DOI: http://dx.doi.org/10.3329/bpj.v17i2.22335 Bangladesh Pharmaceutical Journal 17(2): 163-171, 2014

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Pharmaceutical Adsorption'

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