Novel thiourea-modified magnetic ion-imprinted chitosan/TiO2 composite for simultaneous removal of cadmium and 2,4-dichlorophenol
Novel thiourea-modified magnetic ion-imprinted chitosan/TiO2 composite for simultaneous removal of cadmium and 2,4-dichlorophenol
复制标题
新型硫脲修饰磁性离子印迹壳聚糖/TiO2复合材料同时去除镉和2,4-二氯苯酚
DOI：
10.1016/j.cej.2012.02.071
复制
发表时间：
2012-05-15
影响因子：
15.1
通讯作者：
Xie, Gengxin
中科院分区：
文献类型：
--
作者：
Chen, Anwei;Zeng, Guangming;Xie, Gengxin
本研究制备了一种新型的硫脲修饰磁性离子印迹壳聚糖/二氧化钛（MICT）吸附剂，以提高其作为复合吸附剂的性能。研究了该复合吸附剂对镉离子的吸附和对2，4-二氯苯酚（2，4-DCP）的降解。结果表明，该菌吸附镉和降解2，4-DCP的最佳pH值为6.0 ~ 7.0。动力学研究表明，吸附过程按准二级动力学模型进行。根据Langmuir吸附模型计算，其对镉的最大吸附量为256.41 mg/g。经气相色谱/质谱（GC/MS）联用技术鉴定，反应的中间产物包括4-氯苯酚、1，4-苯醌、苯酚、环己醇等微量物质。根据降解产物的分析，提出了降解过程包括还原脱氯或与羟基自由基反应。用过的吸附剂经解吸再生后可重复使用，5次循环后吸附和降解性能基本不受影响。(C)出版社：Elsevier B. V.
In the present study, a novel type of adsorbent called thiourea-modified magnetic ion-imprinted chitosan/TiO2 (MICT) was prepared with the purpose of improving its feature as a composite adsorbent. The simultaneous cadmium ion adsorption and 2,4-dichlorophenol (2,4-DCP) degradation by this novel composite adsorbent were investigated. The obtained results showed that the optimum pH values for adsorption of cadmium and degradation of 2,4-DCP were approximately 6.0-7.0. The kinetics study demonstrated that the adsorption process proceeded according to the pseudo-second-order model. The maximum adsorption capacity for cadmium was 256.41 mg/g according to the Langmuir model. The intermediate products of the reaction consisted of 4-chlorophenol, 1,4-benzoquinone, phenol, cyclohexanol, and some other trace substances, as identified by gas chromatography/mass spectroscopy (GC/MS) technique. The sequential degradation process was proposed, including reductive dechlorination or reaction with hydroxyl radicals based on the products identified. The used sorbent was reusable after regenerated through desorption, and the adsorption and degradation capacities were barely affected after five cycles. (C) 2012 Published by Elsevier B.V.