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首页> 外文期刊>Chemical engineering journal >Kinetics, equilibrium modeling, and thermodynamics on removal of Cr(VI) ions from aqueous solution using novel composites with strong base anion exchanger microspheres embedded into chitosan/poly(vinyl amine) cryogels
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Kinetics, equilibrium modeling, and thermodynamics on removal of Cr(VI) ions from aqueous solution using novel composites with strong base anion exchanger microspheres embedded into chitosan/poly(vinyl amine) cryogels

机译：用新型复合材料从水溶液中除去水溶液中的Cr（VI）离子与壳聚糖/聚（乙烯基胺）冷冻凝胶中的强基团阴离子交换器微球去除Cr（VI）离子的热力学

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摘要

Efficient removal of hexavalent chromium Cr(VI) is a stringent issue which requires efficient and, preferable, reusable sorbents. In this context, novel composite sorbents were designed in this work consisting of a combination between the chitosan (CS) and a synthetic polycation, poly(vinyl amine) (PVAm), in a ratio of 80:20, w/w, dual-cross-linked with glutaraldehyde (GA) and ethylene glycol diglycidyl ether (EGDGE), in which the microspheres of some porous strong base anion exchangers (IEx) having (vinylbenzyl diethyl 2-hydroxyethyl) ammonium chloride functional groups, and sizes in the range 90-200 mu m, were evenly dispersed. Macroporous CS/PVAm/IEx composites as cryobeads or monoliths were applied to the sorption of Cr(VI) from synthetic aqueous solutions, in batch mode. The results revealed that the sorption of Cr(VI) oxyanions was high in the range of pH 3-6, and abruptly decreased when pH was > 6. The pseudo-first order kinetic equation well fitted the kinetics profiles obtained with all composites indicating that electrostatic interaction dominated the sorption process. Equilibrium sorption results of Cr(VI) onto composite cryobeads were the best described by the Sips, Langmuir, and Temkin isotherm models. The maximum sorption capacity evaluated by the Langmuir model at 25 degrees C was in the range 200-320 mg Cr(VI)/g adsorbent. The sorption process proved to be spontaneous and endothermic. The composite cryogels could be repeatedly used in the sorption of Cr(VI), a low decrease of the adsorption capacity being observed after five consecutive sorption/desorption cycles. The remarkable sorption capacities, and high reusability of the CS/PVAm/IEx composites suggest the promising potential of these novel sorbents in the removal of Cr(VI).
机译：高效除去六价铬Cr（VI）是一种严格的问题，需要有效，优选可重复使用的吸附剂。在这种情况下，在该工作中设计了新的复合吸附剂，该作品是由壳聚糖（Cs）和合成聚阳离子，聚（乙烯基胺）（PVAM）之间的组合，以80:20，w / w，双 - 与戊二醛（GA）和乙二醇二缩水甘油醚（EGDGE）交联，其中一些多孔强基底阴离子交换剂（IEX）的微球（IEX）具有（乙烯基苄基二乙基二羟甲基）氯化铵官能团，其尺寸在90范围内-200 mu m，均匀分散。在批料模式中，将大孔CS / PVAM / IEX复合材料应用于来自合成水溶液的Cr（VI）的吸附。结果表明，Cr（VI）氧合的吸附在pH 3-6的范围内，当pH值> 6时突然下降。伪第一阶动力学方程很好地安装了用所有复合材料获得的动力学曲线曲线静电相互作用主导了吸附过程。 Cr（vi）将Cr（vi）的平衡引发结果是啜饮，朗马尔和特田等温模型的最佳描述。由25摄氏度的Langmuir模型评价的最大吸附能量在200-320mg Cr（VI）/ g吸附剂的范围内。吸附过程证明是自发性和吸热的。可以在Cr（VI）的吸附中重复使用复合冷冻胶质，在连续吸附/解吸循环后观察到吸附能力的低降低。 CS / PVAM / IEX复合材料的显着吸附能力和高可重用性表明这些新型吸附剂在去除CR（VI）中的有希望的潜力。

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