Abstract 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 bio-based adsorbent.

中文翻译：

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氨基功能化木质素微球去除双氯芬酸及重金属离子的动力学和柱吸附研究

摘要 对双氯芬酸、DCF、重金属和氧阴离子在高效氨基官能化木质素基微球吸附剂 (A-LMS) 上的吸附进行了深入的动力学和柱吸附研究。A-LMS 是通过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的反相悬浮共聚反应合成的。批量吸附结果表明高去除能力的过程自发性和可行性：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 复合物通过静电和范德华相互作用的稳定性。伪二阶和 Weber-Morris 拟合的结果表明去除率很快；因此，进行了色谱柱测试。单阻力传质模型，即传质 (kfa) 和扩散系数 (Deff)，将孔扩散传输显示为限速步骤。固定床柱数据与经验模型的拟合证明了流速和吸附质入口浓度对突破行为的影响。孔表面扩散模型 (PSDM) 表达了在应用液压加载速率下的传质，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))，无需在完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。显示孔扩散传输作为限速步骤。固定床柱数据与经验模型的拟合证明了流速和吸附质入口浓度对突破行为的影响。孔表面扩散模型 (PSDM) 表达了在应用液压加载速率下的传质，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))，无需在完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。显示孔扩散传输作为限速步骤。固定床柱数据与经验模型的拟合证明了流速和吸附质入口浓度对突破行为的影响。孔表面扩散模型 (PSDM) 表达了在应用液压加载速率下的传质，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))，无需在完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。