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首页> 外文期刊>Chemical engineering journal >Cd(II)-imprinted polymer sorbents prepared by combination of surface imprinting technique with hydrothermal assisted sol-gel process for selective removal of cadmium(II) from aqueous solution
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Cd(II)-imprinted polymer sorbents prepared by combination of surface imprinting technique with hydrothermal assisted sol-gel process for selective removal of cadmium(II) from aqueous solution

机译：表面印迹技术与水热辅助溶胶-凝胶工艺相结合制备的镉（II）印迹聚合物吸附剂，用于从水溶液中选择性去除镉（II）

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摘要

A new ion-imprinted thiocyanato-functionalized silica gel sorbents was synthesized by the combination of a surface imprinting technique with a hydrothermal-assisted sol-gel process with Cd(II) as the template, 3-thiocyanatopropyltriethoxysilane (TCPTS) as the functional monomer, and epichlorohydrin as the cross-linking agent (IIP-TCPTS/SiO2) for the selective removal of Cd(II) from aqueous solution. The Cd(II)-imprinted thiocyanato-functionalized silica sorbents was characterized by FT1R, SEM, nitrogen adsorption and the static adsorption-desorption experiment method. The results showed that the maximum static adsorption capacity of IIP-TCPTS/SiO2 sorbents prepared by hydrothermal heating method was 2.3 times as much as the conventional heating method. The HP-TCPTS/SiO2 sorbents offered a fast kinetics for the adsorption and desorption of Cd(II). The static uptake capacity and selectivity coefficient of IIP-TCPTS/SiO2 sorbents were higher than those of the non-imprinted sorbents. HP-TCPTS/SiO2 sorbents had a substantial binding capacity in the range of pH 4.2-8.6 and could be used repeatedly. The Langmuir adsorption model was more favorable than the Freundlich adsorption model. Kinetic studies indicated that the adsorption followed a pseudo-second-order model. Various thermodynamic parameters such as ΔG°, ΔH° and ΔS° were evaluated with results indicating that this system was a spontaneous and endothermic process. The results showed that HP-TCPTS/SiO2 sorbents could be employed as an effective material for the selective removal of Cd(II) from aqueous solutions.
机译：结合表面印迹技术和水热辅助溶胶-凝胶工艺，以Cd（II）为模板，以3-硫氰酸根合丙基三乙氧基硅烷（TCPTS）为功能单体，合成了一种新型的离子印迹硫氰基官能化硅胶吸附剂。表氯醇为交联剂（IIP-TCPTS / SiO2），用于从水溶液中选择性去除Cd（II）。通过FTR，SEM，氮吸附和静态吸附-脱附实验方法对Cd（II）-印迹的硫氰酸根合官能化二氧化硅吸附剂进行了表征。结果表明，水热加热法制备的IIP-TCPTS / SiO2吸附剂的最大静态吸附容量是常规加热法的2.3倍。 HP-TCPTS / SiO2吸附剂为Cd（II）的吸附和解吸提供了快速的动力学。 IIP-TCPTS / SiO2吸附剂的静态吸收容量和选择性系数高于非压印吸附剂。 HP-TCPTS / SiO2吸附剂在pH 4.2-8.6范围内具有很大的结合能力，可以重复使用。 Langmuir吸附模型比Freundlich吸附模型更有利。动力学研究表明吸附遵循伪二级模型。对各种热力学参数（例如ΔG°，ΔH°和ΔS°）进行了评估，结果表明该系统是自发的吸热过程。结果表明，HP-TCPTS / SiO2吸附剂可用作从水溶液中选择性去除Cd（II）的有效材料。

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