Effects of sulfate ions and slightly acidic pH conditions on Cr(VI) adsorption onto silica gelatin composite |
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| Authors: | Francesco Venditti Francesca Cuomo Andrea Ceglie Luigi Ambrosone Francesco Lopez |
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| Affiliation: | 1. Consorzio per lo Sviluppo Industriale della Valle del Biferno, I-86039 Termoli, Italy;2. Consorzio Interuniversitario per lo sviluppo dei Sistemi a Grande Interfase (CSGI), c/o Department of Food Technology (DISTAAM), Università del Molise, I-86100 Campobasso, Italy;1. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100149, PR China;3. School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, PR China;4. College of Chemical Engineering, Xiangtan University, Xiangtan 411105, PR China;1. Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China;2. School of Environmental Studies, China University of Geosciences, Wuhan 430074, PR China;3. Materials Research Laboratory, Materials Research Institute and Department of Ecosystem Science and Management, The Pennsylvania State University, University Park, PA 16802, USA |
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| Abstract: | The feasibility of utilizing CTAB–silica gelatin composite (C-SGC) to remove hexavalent chromium from aqueous solutions under different conditions was investigated. Removal of chromate was assessed through evaluation of the adsorption kinetics of chromate ions on the composite under equilibrium conditions in the presence of sulfate ions and at a slightly acidic pH condition (pH 5.8). Adsorption competition tests in the presence of sulfate ions showed that Cr(VI) was still effectively adsorbed from aqueous solution regardless of the presence of the competing anions. In fact, the adsorption kinetics performed at different initial chromate concentrations were unaffected by the presence of 100 mg L?1 sulfate ions (pH 7.5). The equilibrium adsorption data were fitted by Freundlich adsorption isotherms which confirmed that the adsorption efficiency of chromium on the CTAB–silica gelatin composite was unchanged in the presence of sulfate ions. Further, the adsorption process was shown to be pH dependent and more efficient at slightly acidic pH (5.8). These findings demonstrated a high specificity of the CTAB–silica gelatin composite for chromium, and highlight the possibility of using this matrix for efficient removal of chromium from industrial wastewater without the need to eliminate contaminant sulfate ions. |
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