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Efficient Decontamination of Lead Ions from Wastewater by Salecan Polysaccharide-Based Hydrogels

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posted on 22.05.2019 by Xiaoliang Qi, Lei Lin, Liangliang Shen, Zhipeng Li, Tao Qin, Yuna Qian, Xuan Wu, Xiong Wei, Qianwen Gong, Jianliang Shen
Designing versatile adsorption materials with high efficiency, excellent reversibility, and economic production is vital for treating wastewater but remains challenging. Here, a new polysaccharide (salecan) based superabsorbent was developed by graft copolymerization of acrylamide and sodium vinylsulfonate onto the salecan and used to remove lead ions (Pb2+) from water. Effects of salecan content, adsorbent amount, contact time, adsorbate concentration, and pH on the extent of Pb2+ adsorption were studied. The optimized absorbent (containing 9 mL of 2% salecan polysaccharide) exhibited an optimal adsorption performance in Pb2+ removal (172.8 mg/g). Noticeably, the adsorptive behavior of gel matched well with the Freundlich isotherm and pseudo-second-order kinetic model. In addition, our product presented no apparent loss in Pb2+ adsorption after 6 cycles. Overall, this work not only provided a new strategy to construct highly efficient and low-cost adsorbent but also demonstrated its potential application for heavy metal removal.

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