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Pectin–Tin(IV) molybdosilicate: An ecofriendly cationic exchanger and its potential for sorption of heavy metals from aqueous solutions

机译:果胶-锡(IV)钼硅酸盐:一种生态友好型阳离子交换剂,具有从水溶液中吸附重金属的潜力

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A novel composite cation exchanger of biopolymer Pectin and Tin(IV) molybdosilicate heteropoly acid salt were prepared by co-precipitation technique. Physico-chemical characterization of Pectin–Tin(IV) molybdosilicate was performed using instrumental techniques such as FTIR, TG, XRD and SEM–EDS. Studies were carried out to investigate ion exchange capacity. pH titration carried out shows cationic nature and polyfunctionality of the exchanger. Distribution coefficients of various metal ions were done to explore the ion exchange behavior of cation exchanger. Distribution studies show that the material is highly selective for toxic heavy metal ions such as Cd2+, Cu2+, Al3+ etc. To investigate the environmental applicability of the exchanger some analytically important binary separations and selective separation of metal ions from industrial effluents were achieved. Kinetic and isotherm parameters were evaluated to predict the mechanism of sorption of heavy metal ions. Mass transfer analysis shows that internal particle diffusion and some degree of boundary layer control the sorption process.
机译:通过共沉淀技术制备了一种新型的生物聚合物果胶和锡(钼)钼硅酸盐杂多酸盐复合阳离子交换剂。果胶-锡(IV)钼硅酸盐的物理化学表征使用诸如FTIR,TG,XRD和SEM-EDS等仪器技术进行。进行了研究以调查离子交换容量。进行的pH滴定显示了交换剂的阳离子性质和多官能度。计算了各种金属离子的分布系数,以探讨阳离子交换剂的离子交换行为。分布研究表明,该材料对有毒重金属离子(例如Cd 2 + ,Cu 2 + ,Al 3 + 等具有很高的选择性)。为了研究该交换器的环境适用性,实现了一些分析上重要的二元分离以及从工业废水中选择性分离金属离子。动力学和等温线参数进行了评估,以预测重金属离子的吸附机理。传质分析表明,内部颗粒扩散和一定程度的边界层控制了吸附过程。

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