Pectin/Activated Carbon-Based Porous Microsphere for Pb2+ Adsorption: Characterization and Adsorption Behaviour

文献类型： 外文期刊

第一作者： Wang, Ri-si

作者： Wang, Ri-si;Shuai, Xi-xiang;Liang, Rui-hong;Chen, Jun;Liu, Cheng-mei;Li, Ya;Shuai, Xi-xiang

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关键词： pectin; activated carbon; microsphere; Pb2+; adsorption

期刊名称：POLYMERS （ 影响因子：4.329； 五年影响因子：4.493 ）

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年卷期： 2021 年 13 卷 15 期

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收录情况： SCI

摘要： The development of effective heavy metal adsorbents has always been the goal of environmentalists. Pectin/activated carbon microspheres (P/ACs) were prepared through simple gelation without chemical crosslinking and utilized for adsorption of Pb2+. Scanning electron microscopy (SEM) revealed that the addition of activated carbon increased the porosity of the microsphere. Texture profile analysis showed good mechanical strength of P/ACs compared with original pectin microspheres. Kinetic studies found that the adsorption process followed a pseudo-second-order model, and the adsorption rate was controlled by film diffusion. Adsorption isotherms were described well by a Langmuir isotherm model, and the maximum adsorption capacity was estimated to be 279.33 mg/g. The P/ACs with the highest activated carbon (P/AC(2:3)) maintained a removal rate over 95.5% after 10 adsorption/desorption cycles. SEM-energy-dispersive X-ray spectrum and XPS analysis suggested a potential mechanism of adsorption are ion exchange between Pb2+ and Ca2+, electronic adsorption, formation of complexes, and physical adsorption of P/ACs. All the above results indicated the P/ACs may be a good candidate for the adsorption of Pb2+.

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