Chemically modified magnetic chitosan microspheres for Cr(VI) removal from acidic aqueous solution |
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| Institution: | 1. CAS Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;2. School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, China;3. CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;1. University of Freiburg, Freiburg Research Institute for Advances Studies (FRIAS), Faculty for Environment and Natural Resources, Chair of Bio-based Materials Engineering, Werthmannstrasse 6, D-79085 Freiburg, Germany;2. Ghent University, Department of Textiles, Technologiepark 907, B-9052 Zwijnaarde, Belgium;3. Topchim N.V., Nijverheidsstraat 98, B-2160 Wommelgem, Belgium;1. Asst. professor, Department of Mechanical and Production Engineering, Sathyabama University, Chennai, India;2. PG Scholar, Department of Mechanical and Production Engineering, Sathyabama University, Chennai, India;3. Professor, Department of Mechanical and Production Engineering, Sathyabama University, Chennai, India;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 10049, PR China;1. State Key Laboratory for Geo-mechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. Laboratory for Precision and Nano Processing Technologies, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney 2052, Australia;3. Department of Safety Engineering, China Institute of Industrial Relations, Beijing 100048, China;1. College of Material Engineering, Jinling Institute of technology, Nanjing, China;2. College of Materials Science and Engineering, Nanjing Technology University, Nanjing, China |
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| Abstract: | A bioadsorbent composed of magnetic silica nanoparticles encapsulated by chitosan microspheres was prepared by the emulsion cross-linking method, and it was then modified with quaternary ammonium groups by reaction with ethylenediamine and glycidyl trimethylammonium chloride. Characterization of the bioadsorbent indicated that it was highly acid resistant and magnetically responsive. The bioadsorbent was then used to remove Cr(VI) from acidic aqueous solution. The results of batch experiments indicated that the optimal pH value was 2.5, and the adsorbent exhibited low pH dependence. The maximum adsorption capacity was 233.1 mg/g at pH 2.5 and 25 °C, and the equilibrium time was determined to be 40–120 min depending on the initial Cr(VI) concentration. The adsorbent could be effectively regenerated using a mixture of 0.3 mol/L NaOH and 0.3 mol/L NaCl with a desorption efficiency of 95.6%, indicating high reusability. In conclusion, the bioadsorbent shows potential for Cr(VI) removal from acidic wastewater. |
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| Keywords: | Chitosan Quaternary ammonium Magnetic Adsorption Cr(VI) |
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