Batch equilibrium and kinetics of mercury removal from aqueous solutions using polythiophene/graphene oxide nanocomposite
Journal article
Authors / Editors
Research Areas
- Earth and related Environmental sciences (NATURAL SCIENCES)
(Geosciences, multidisciplinary; Mineralogy; Palaeontology; Geochemistry and geophysics; Physical geography; Geology; Volcanology; Environmental sciences (social aspects to be 5.7);
- Meteorology and atmospheric sciences; climatic research;
- Oceanography; Hydrology; Water resources;) - NATURAL SCIENCES (Frascati classification)
Publication Details
Subtitle: Batch equilibrium and kinetics of mercury removal from aqueous solutions using polythiophene/graphene oxide nanocomposite
Publisher: IWA Publishing
Publication year: 2017
Journal: Water Science & Technology (0273-1223)
Volume number: 75
Issue number: 12
Start page: 2841
End page: 2851
Number of pages: 11
ISSN: 0273-1223
URL: https://iwaponline.com/wst/article-abstract/75/12/2841/20449
Languages: English-United States (EN-US)
Abstract
Polythiophene/graphene oxide (PTh/GO) nanocomposite (NC) was prepared through polymerisation of thiophene in the presence of GO and was used for mercury ions (Hg2+) adsorption in aqueous solutions. Equilibrium studies showed that mercury removal was strongly influenced by solution pH and GO composition in the NC. The equilibrium data were well described by both Langmuir and Freundlich isotherm models, with a Langmuir maximum adsorption capacity of 113.6 mg/g. Adsorption kinetics were rapid and correlated well with the pseudo-second-order model. The thermodynamic studies indicated that the adsorption was spontaneous and endothermic in nature, and occurred through a physicochemical mechanism. Desorption studies revealed that PTh/GO NC could be used repeatedly for three adsorption-desorption cycles without a significant loss in its capacity. Competing ions reduced mercury uptake although considerable values were still attained. The findings of this study suggest that PTh/GO NC is a potential adsorbent for Hg2+ removal from aqueous solutions.
Keywords
adsorption, graphene oxide, mercury, nanocomposite, polythiophene
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