高交联硫代碳酰肼-壳聚糖凝胶对Cd(II)和Cr(VI)离子的去除
Removal of Cd(II) and Cr(VI) ions by highly cross-linked Thiocarbohydrazide-chitosan gel.
作者信息
Li Ronghua, Liang Wen, Li Manlin, Jiang Shuncheng, Huang Hui, Zhang Zengqiang, Wang Jim J, Awasthi Mukesh Kumar
机构信息
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, PR China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
出版信息
Int J Biol Macromol. 2017 Nov;104(Pt A):1072-1081. doi: 10.1016/j.ijbiomac.2017.07.005. Epub 2017 Jul 3.
A highly cross-linked Thiocarbohydrazide-modified chitosan (TCCS) gel was synthesized by using formaldehyde as linkage, and was used in removal of Cd(II) and Cr(VI) from aqueous solution. The results showed that TCCS could be used in a wider pH range and had higher adsorption abilities than raw chitosan for Cd(II) and Cr(VI) ions. The maximum adsorption capacities of the synthetic TCCS for two ions reached 81.26 and 144.68mg/g at 298K, respectively. The endothermic adsorption exhibited pseudo-second-order kinetic behavior and the adsorption isotherm could be well described by Langmuir model. The Cd(II) ion adsorption mechanism was dominated by a complexation reaction process, while the Cr(VI) adsorption was governed by a multiple mechanism including electrostatic attraction, reduction and complexation process. TCCS was easy to be regenerated and had great reusability potential in Cd(II) and Cr(VI) ions capture from aqueous solution.
以甲醛为交联剂合成了一种高度交联的硫代碳酰肼改性壳聚糖（TCCS）凝胶，并将其用于从水溶液中去除Cd(II)和Cr(VI)。结果表明，TCCS在更宽的pH范围内可用，且对Cd(II)和Cr(VI)离子的吸附能力高于未改性壳聚糖。在298K下，合成的TCCS对两种离子的最大吸附容量分别达到81.26和144.68mg/g。吸热吸附表现出拟二级动力学行为，吸附等温线可用Langmuir模型很好地描述。Cd(II)离子的吸附机制以络合反应过程为主，而Cr(VI)的吸附则由包括静电吸引、还原和络合过程在内的多种机制控制。TCCS易于再生，在从水溶液中捕获Cd(II)和Cr(VI)离子方面具有很大的重复使用潜力。
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