Removal of Cd2(+) ions from aqueous solution using cassava starch-based superabsorbent polymers

文献类型： 外文期刊

第一作者： Bai, Wenbo

作者： Bai, Wenbo;Lv, Guohua;Wu, Yongfeng;Liu, Qi;Song, Jiqing;Fan, Liren;Shi, Jiyan;Fan, Liren;Zhou, Yang;Zhang, Yin;Song, Jiqing

作者机构：

关键词： adsorption;biosynthesis of polymers;crosslinking;grafting;kinetics

期刊名称：JOURNAL OF APPLIED POLYMER SCIENCE （ 影响因子：3.125； 五年影响因子：2.754 ）

ISSN： 0021-8995

年卷期： 2017 年 134 卷 17 期

页码：

收录情况： SCI

摘要： A comprehensive feasibility study on the adsorption of Cd2(+) ions by cassava starch-based superabsorbent polymers (CSTSAPs) as the biosorbent was investigated as a function of adsorbent dosage, pH, initial concentration, contact time, and temperature. An orthogonal experiment and range analysis were applied to optimize the adsorption conditions. Adsorbent dosage and initial concentration were the most sensitive variables for adsorption capacity. The maximum adsorption value of Cd-2+ ions was determined as 347.46 mg/g at pH 6.0, initial concentration of 200 mg/L, and contact temperature and time of 323 K and 6 h, respectively, with 0.1 g adsorbent dosage. The equilibrium data were well described by a Langmuir model, and the adsorption process was well fitted by pseudo-second-order kinetics. The Fourier transform infrared spectroscopy ( FTIR) data confirmed that acrylic acid and acrylic amide grafted onto the cassava starch. The X-ray diffraction and FTIR results for the Cd-2+ -absorbed CST-SAP (CST-SAP-Cd-2+) samples showed that the CST-SAP could effectively adsorb Cd-2+ ions and that the characteristic groups were translocated by chelation. The scanning electron microscopy results for the CST-SAP revealed that the surface of the polymer was rough, and the layered structure that was full of folds caused an enhanced specific surface; such conditions were beneficial to Cd 21 ion adsorption. It was concluded that the CST-SAP was an excellent adsorbent for Cd-2+ ion removal from aqueous solution. (C) 2017 Wiley Periodicals,Inc. J. Appl. Polym. Sci. 2017, 134, 44758.

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