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首页> 外文期刊>Journal of industrial and engineering chemistry >Kinetics and column adsorption study of diclofenac and heavy-metal ions removal by amino-functionalized lignin microspheres
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Kinetics and column adsorption study of diclofenac and heavy-metal ions removal by amino-functionalized lignin microspheres

机译：氨基官能化木质素微球去除双氯芬酸和重金属离子的动力学和柱吸附研究

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摘要

In-depth kinetic and column adsorption study for diclofenac, DCF, heavy-metal and oxyanions adsorption on highly effective amino-functionalized lignin-based microsphere adsorbent (A-LMS) is examined. The A-LMS was synthesized via inverse suspension copolymerization of industrial kraft lignin with the amino containing grafting-agent (polyethylene imine), and an epoxy chloropropane cross-linker. The batch adsorption results indicated process spontaneity and feasibility of a high removal capacity: DCF(151.13) Cd2+(74.84)>Cr(VI)(54.20)>As(V)(53.12)>Ni2+(49.42 mg g(-1)). The quantum chemical calculated interaction energies reveal stabilization of the A-LMS/DCF complex through the electrostatics and van der Waals interactions. The results from the pseudo-second order and Weber-Morris fitting indicate a fast removal rate; thus, column tests were undertaken. The single resistance mass transfer model, i.e. the mass transfer (kfa) and diffusion coefficient (Deff), shows pore diffusional transport as a rate limiting step. The fitting of the fixed bed column data with empirical models demonstrates the influences of flow rate and adsorbate inlet concentration on the breakthrough behavior. Pore surface diffusion modeling (PSDM) expresses mass transport under applied hydraulic loading rates, calculated breakthrough point adsorption capacities: Cd2+(58.1)>Cr(VI)(54.1)>As(V)(50.9)Ni2+(42.9 mg g(-1))), without performing the experimentation on a full pilot-scale level, further confirms the high applicability of the A-LMS biobased adsorbent. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：对高效氨基功能化木质素微球吸附剂（A-LMS）对双氯芬酸、DCF、重金属和阴离子的吸附进行了深入的动力学和柱吸附研究。将工业硫酸盐木质素与含氨基接枝剂（聚乙烯亚胺）和环氧氯丙烷交联剂进行反相悬浮共聚，合成了A-LMS。间歇吸附实验结果表明，工艺的自发性和高去除能力的可行性：DCF（151.13）>Cd2+（74.84）>Cr（VI）（54.20）>As（V）（53.12）>Ni2+（49.42 mg g（-1））。量子化学计算的相互作用能揭示了A-LMS/DCF络合物通过静电和范德华相互作用的稳定性。伪二阶和韦伯-莫里斯拟合的结果表明，去除率很快；因此，进行了柱状试验。单阻力传质模型，即传质（kfa）和扩散系数（Deff），表明孔隙扩散传输是一个限速步骤。固定床柱数据与经验模型的拟合表明，流速和吸附质入口浓度对穿透行为有影响。孔隙表面扩散模型（PSDM）表达了应用水力加载速率下的质量传输，计算出的突破点吸附容量：Cd2+（58.1）>Cr（VI）（54.1）>As（V）（50.9）Ni2+（42.9 mg g（-1）），而无需在全中试水平上进行实验，进一步证实了a-LMS生物基吸附剂的高适用性。（C） 2020年，韩国工业和工程化学学会。由爱思唯尔B.V.出版。版权所有。

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