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首页> 外文期刊>Journal of Applied Polymer Science >Functionalized chitosan with butylammonium ionic liquids for removal of Cr(VI) from aqueous solution
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Functionalized chitosan with butylammonium ionic liquids for removal of Cr(VI) from aqueous solution

机译：用丁基铵离子液体官能化壳聚糖，用于从水溶液中除去Cr（VI）

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摘要

Environmental pollution by heavy metals is currently a problem of great concern for human health. In this context, this study aims to contribute with the synthesis and characterization of chitosan functionalized with three different ionic liquids (n-butylammonium acetate,sec-butylammonium acetate, andtert-butylammonium acetate) followed by its application in hexavalent chromium effluent treatment. The adsorbents synthesized (ChN, ChS, and ChT) were characterized by SEM, EDS, FTIR, BET, RDD, PSD, and XRD techniques. Afterward, the influences of temperature, contact time, and pH on the Cr(VI) adsorption process were evaluated. The solution with pH 3 displayed the highest adsorption capacities (107.31, 104.60, and 107.97 mg.g(-1)for ChN, ChS, and ChT, respectively). The kinetic data were better adjusted to the Weber-Morris kinetic model with an ideal time of 2 h. Furthermore, the influence of temperature was evaluated using the Freundlich and Langmuir isotherms, with maximum capacities of 142.05 (ChN), 131.58 (ChS), and 146.63 mg.g(-1)(ChT). The adsorbent displayed enhanced adsorption properties in comparison with raw chitosan by an intensification of the electrostatic interaction between amino groups and hexavalent chromium. Finally, the reusability was investigated, and significant results were observed (84.33 +/- 4.87%) in the adsorption process after 4 cycles.
机译：重金属对环境的污染是目前人类健康十分关注的问题。在此背景下，本研究旨在合成和表征三种不同离子液体（醋酸正丁胺、醋酸仲丁胺和醋酸叔丁胺）功能化的壳聚糖，并将其应用于六价铬废水处理。通过SEM、EDS、FTIR、BET、RDD、PSD和XRD技术对合成的吸附剂（ChN、ChS和ChT）进行了表征。随后，研究了温度、接触时间和pH值对Cr（VI）吸附过程的影响。pH值为3的溶液对ChN、ChS和ChT的吸附容量最高（分别为107.31、104.60和107.97 mg.g（-1））。动力学数据更好地调整到韦伯-莫里斯动力学模型，理想时间为2小时。此外，使用Freundlich和Langmuir等温线评估温度的影响，最大容量为142.05（ChN）、131.58（ChS）和146.63 mg。g（-1）（红隧）。与未经处理的壳聚糖相比，该吸附剂通过增强氨基和六价铬之间的静电相互作用而显示出增强的吸附性能。最后，对其可重复使用性进行了研究，并在4次循环后的吸附过程中观察到显著结果（84.33+/-4.87%）。

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