Adsorption of hydroquinone and Pb(II) from water by β-cyclodextrin/polyethyleneimine bi-functional polymer
Adsorption of hydroquinone and Pb(II) from water by β-cyclodextrin/polyethyleneimine bi-functional polymer
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DOI：
10.1016/j.carbpol.2022.119806
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发表时间：
2022-07-11
影响因子：
11.2
通讯作者：
Tang, Kewen
中科院分区：
文献类型：
--
作者：
Xu, Weifeng;Liu, Xiang;Tang, Kewen
合成了一种新型的双功能β-环糊精聚合物(CD@TCT@PEI)，用于废水中对苯二酚和铅的去除。综合研究了Cd@TCT@PEI对对苯二酚和铅(II)的结构和吸附性能。两种吸附过程均符合准二级动力学模型。对苯二酚和铅(II)的吸附等温线符合朗缪尔等温吸附模型，对苯二酚和铅(II)的最大吸附容量分别为364.86和113.52 mg g(-1)。对苯二酚和铅(II)在Cd@TCT@PEI上的吸附是一个放热自发过程。吸附后的Cd@TCT@PEI易于再生，5次循环后仍能保持较高的吸附性能。吸附铅(II)的主要原因是静电作用和配位作用，环糊精的包合作用和氢键相互作用是吸附对苯二酚的主要原因。本研究为设计一种同时去除废水中重金属离子和有机微污染物的吸附剂提供了一些启示。
A novel bi-functional beta-cyclodextrin polymer (CD@TCT@PEI) was synthesized for the removal of hydroquinone and Pb(II) from wastewater. The structure and adsorption performance of CD@TCT@PEI towards hydroquinone and Pb(II) were studied comprehensively. Both of the adsorption processes fit the pseudo-second-order kinetic model well. The adsorption isotherms of hydroquinone and Pb(II) could be described well by Langmuir isotherm model, and the maximum adsorption capacities of hydroquinone and Pb(II) are 364.86 and 113.52 mg g(-1), respectively. The adsorption of hydroquinone and Pb(II) on CD@TCT@PEI is an exothermic and spontaneous process. The adsorbed CD@TCT@PEI could be regenerated easily, and can still maintain high adsorption performance after 5 cycles. The electrostatic interaction and coordination interaction account for the adsorption of Pb(II), and inclusion of cyclodextrin and hydrogen-bond interaction are responsible for hydroquinone adsorption. This study provides some insights to design an adsorbent that can simultaneously remove heavy metal ions and organic micropollutants from wastewater.