Biosorption of Cr(VI) from aqueous solutions by nonliving green algae Cladophora albida |
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| Authors: | Liping Deng Yang Zhang Jie Qin Xinting Wang Xiaobin Zhu |
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| Affiliation: | 1. Institute of Oceanology, Chinese Academy of Sciences, No. 7, Nanhai Road, Qingdao 266071, China;2. Graduate School, Chinese Academy of Sciences, Beijing 100049, China;3. Beihai Monitoring Center, State Oceanic Administration, Qingdao 266033, China;1. Faculty of Chemical Technology, Viet Tri University of Industry, Tien Kien, Lam Thao, Phu Tho, Viet Nam;2. Department of Marine Bioscience, Fukui Prefectural University, 1-1 Gakuen, Obama, Fukui 917-003, Japan;3. School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan;1. School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China;2. Jiangsu Heavy Responsibility Group, Pizhou 221300, China;1. Department of Marine Sciences and Convergent Technology, College of Science and Technology, Hanyang University, Ansan 426-791, South Korea;2. Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung 80424, Taiwan, ROC;3. Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 80424, Taiwan, ROC;4. Department of Biological Sciences, College of Natural Sciences, Sungkyunkwan University, Suwon 440-746, South Korea;1. Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, PR China;2. National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, PR China |
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| Abstract: | Biosorption of Cr(VI) from aqueous solutions by nonliving green algae Cladophora albida was investigated in batch experiments. The influence of pH, algal dosage, initial Cr(VI) concentration, temperature and co-existing anions on removal efficiencies of C. albida was studied. Cr(VI) removal process was influenced significantly by the variation of pH, and the optimum pH was chosen at a range of 1.0–3.0. The optimum algal dosage 2 g/L was used in the experiment. The removal rate of Cr(VI) was relatively rapid in the first 60 min, but then the rate decreased gradually. Removal mechanism was studied by analyzing Cr(VI) and total Cr in the solution. Biosorption and bioreduction were involved in the Cr(VI) removal. Biosorption of Cr(VI) was the first step, followed by Cr(VI) bioreduction and Cr(III) biosorption on the algal biomass. Actual industrial wastewater was used to evaluate the practicality of the biomass C. albida. From a practical viewpoint, the abundant and economic biomass C. albida could be used for removal of Cr(VI) from wastewater by the reduction of toxic Cr(VI) to less toxic Cr(III). |
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