The removal of amoxicillin from wastewater using organobentonite

Organobentonites used as absorbents to remove amoxicillin from wastewater have been investigated here because they are effective in removing organic pollutants. It is evident that bentonite modified with hexadecyl trimethyl ammonium (DK1) can effectively remove amoxicillin from aqueous solution. Bat...

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Bibliographic Details
Published in:	Journal of environmental management Vol. 129; pp. 569 - 576
Main Authors:	Zha, Shuang xing, Zhou, Yan, Jin, Xiaoying, Chen, Zuliang
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 15-11-2013 Elsevier Academic Press Ltd
Subjects:	Adsorption Amoxicillin Amoxicillin - chemistry Animal, plant and microbial ecology Anti-Bacterial Agents - chemistry Antibiotics Applied ecology Applied sciences Bentonite - chemistry Biodegradation Biological and medical sciences Characterization Conservation, protection and management of environment and wildlife Exact sciences and technology Fundamental and applied biological sciences. Psychology General aspects Hydrogen-Ion Concentration Kinetics Microscopy, Electron, Scanning Organobentonite Pollution Powder Diffraction Sorption Spectroscopy, Fourier Transform Infrared Surface-Active Agents - chemistry Temperature Time Factors Wastewater Wastewaters Water Pollutants, Chemical - chemistry Water treatment Water treatment and pollution X-Ray Diffraction Sorption Characterization Organobentonite Wastewater Amoxicillin Environmental management Waste water
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Summary:	Organobentonites used as absorbents to remove amoxicillin from wastewater have been investigated here because they are effective in removing organic pollutants. It is evident that bentonite modified with hexadecyl trimethyl ammonium (DK1) can effectively remove amoxicillin from aqueous solution. Batch experiments showed that the adsorption of amoxicillin onto DK1 fitted well to a pseudo second-order kinetic model with corresponding rate constants (0.0187 g/mg min at 20 °C). The Langmuir isotherm provided the highest adsorption capacity (26.18 mg/g at 20 °C). Our thermodynamic study suggested that the adsorption of amoxicillin onto DK1 was physisorptive and endothermic in nature. Furthermore DK1 was characterized by scanning electronic microscopy (SEM), Specific Surface Area (SSA), X-ray powder diffraction (XRD) and Fourier Transform Infrared (FTIR) spectrometer. These characterizations provided evidence of the morphological properties and how well the adsorption process performed. An adsorption mechanism including both ion-exchange and partition was proposed. Finally, DK1 was used to remove amoxicillin from wastewaters and the results showed 81.9% and 87.5% of amoxicillin was removed at 19.0 mg/L and 2.0 mg/L, respectively. •Organobentonites were used to remove amoxicillin.•Equilibrium, kinetics, and its application were studied.•Organobentonite was characterized by SEM, XRD and FTIR.•The mechanism of adsorption of amoxicillin was proposed.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0301-4797 1095-8630
DOI:	10.1016/j.jenvman.2013.08.032