采用表面印迹法,以Cr(Ⅲ)为模板离子,UiO-66为金属-有机框架材料(MOFs),对印迹条件进行优化,制备了19种Cr(Ⅲ)离子印迹聚合物[Cr(Ⅲ)-IIPs]及相应的非印迹聚合物(NIPs)。制备印迹聚合物的优化条件为:以α-甲基丙烯酸为功能单体,模板离子与功能单体、交联剂的摩尔比为1∶4∶60,UiO-66用量为30.00mg,乙醇与水(两者体积比为1∶1)为致孔剂。通过扫描电子显微镜、傅里叶变换红外光谱仪、吸附实验对优化条件下制备的Cr(Ⅲ)-IIP14和NIP14进行结构表征和性能研究。结果表明:Cr(Ⅲ)-IIP14对Cr(Ⅲ)离子的吸附量为4.61mmol/g,印迹因子为1.66,且在“竞争离子”共存条件下,对Cr(Ⅲ)离子具有良好的吸附选择性;Cr(Ⅲ)-IIP14吸附行为符合 Freundlich等温吸附模型和准二级动力学模型,吸附过程以化学吸附和多分子层吸附为主。
Using surface imprinting method with Cr(Ⅲ) as the template ion and UiO-66 as the metal organic framework material (MOF),the imprinting conditions were systematically optimized to prepare 19 types of Cr(Ⅲ) ion-imprinted polymers [Cr(Ⅲ)-IIPs] and their corresponding non-imprinted polymers (NIPs).The optimized conditions for preparing the imprinted polymers were as follows:α-methyl acrylic acid as the functional monomer,the molar ratio of template ion to functional monomer and crosslinking agent of 1∶4∶60,the UiO-66 amount of 30.00mg,and ethanol and water (v/v=1∶1) as pore forming solvents.The structure and performance of Cr(Ⅲ)-IIP14 and NIP14 prepared under the optimized conditions were characterized and studied by scanning electron microscopy,Fourier transform infrared spectroscopy and adsorption experiments.The results showed that the Cr(Ⅲ)-IIP14 had an adsorption capacity of 4.61mmol/g for Cr(Ⅲ) ions,an imprinting factor of 1.66,and good adsorption selectivity for the target ions under the coexistence of “competitive ions”.The adsorption behavior of Cr(Ⅲ)-IIP14 conformed to the Freundlich isothermal adsorption model and quasi-second-order kinetic model,and the adsorption process was mainly chemical adsorption and multimolecular layer adsorption.
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基金资助
国家自然科学基金地区科学基金项目(21764008)
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