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首页> 外文期刊>Separation and Purification Technology >A sustainable cationic chitosan/E-coli fiber biosorbent for Pt(IV) removal and recovery in batch and column systems
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A sustainable cationic chitosan/E-coli fiber biosorbent for Pt(IV) removal and recovery in batch and column systems

机译：一种可持续的阳离子壳聚糖/大肠杆菌纤维生物吸附剂，用于间歇和塔系统中的Pt（IV）去除和回收

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In this study, the cationic bacterial biosorbent, poly(allylamine hydrochloride) (PAA/HCl)-modified Escherichia colt was successfully immobilized as a chitosan fiber, which was proved to be a sustainable biosorbent for platinum removal and recovery from aqueous solutions in batch and column systems. Compared to the commercial ion exchange resins, PAA/HCl-modified E. coli chitosan fiber showed a quite good performance for Pt(IV) removal. Two-parameter (Langmuir and Freundlich) and three-parameter (Sips and Redlich-Peterson) models were employed to describe the batch isotherm experimental data. Among these four models, the Redlich-Peterson model fit best, with higher coefficient of determination, chi-square and average percentage error values. Thermodynamic parameters (Delta G(0) < 0 and Delta H-0 > 0) showed the spontaneity and endothermic nature of biosorption process. The kinetics of Pt(IV) biosorption with different initial concentrations were better fit by the pseudo-second-order model, with higher coefficient of determinations and more closely predicted q(e) values. An acidified 0.005 M thiourea was used to regenerate platinum from exhausted biosorbent maintaining desorption efficiencies over 90.2% until five cycles. In the column studies, the breakthrough curve showed a typical S-shaped curve, with breakthrough and exhaustion times appearing at 36.0 h and 52.5 h, respectively, which was opened up a possibility of column regeneration. (C) 2015 Elsevier B.V. All rights reserved.
机译：在这项研究中，阳离子细菌生物吸附剂，聚（烯丙胺盐酸盐）（PAA / HCl）改性的大肠杆菌（Escherichia colt）被成功固定为壳聚糖纤维，被证明是一种可持续的生物吸附剂，用于从水溶液中分批回收和回收铂。色谱柱系统。与市售离子交换树脂相比，PAA / HCl改性的大肠杆菌壳聚糖纤维表现出相当好的Pt（IV）去除性能。采用两参数模型（Langmuir和Freundlich）和三参数模型（Sips和Redlich-Peterson）来描述批量等温线实验数据。在这四个模型中，Redlich-Peterson模型最适合，具有较高的确定系数，卡方和平均百分比误差值。热力学参数（Delta G（0）<0和Delta H-0> 0）显示了生物吸附过程的自发性和吸热性。伪二级模型较好地拟合了不同初始浓度的Pt（IV）生物吸附动力学，具有更高的测定系数和更紧密的q（e）预测值。使用酸化的0.005 M硫脲从耗尽的生物吸附剂中再生铂，直至五个循环之前，其解吸效率均保持在90.2％以上。在色谱柱研究中，穿透曲线显示为典型的S形曲线，穿透时间和耗尽时间分别出现在36.0 h和52.5 h，这为色谱柱再生提供了可能。 （C）2015 Elsevier B.V.保留所有权利。

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