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以Sr(Ⅱ)为模板,壳聚糖为功能体,凹凸棒石为载体,γ-(2,3环氧丙氧)丙基三甲氧基硅烷为偶联剂,利用表面分子印迹技术和溶胶-凝胶法制备了凹凸棒石表面离子印迹聚合物。采用扫描电子显微镜、Fourier变换红外光谱对凹凸棒石及其表面离子印迹聚合物进行了表征,运用等离子体发射光谱技术探讨了pH值、吸附剂用量、静置时间对两者吸附行为的影响,考察了它们的饱和吸附容量和吸附效率,对比研究了凹凸棒石及其表面离子印迹聚合物对水溶液中Sr(Ⅱ)的吸附机制。结果表明:在最优化条件下,凹凸棒石表面离子印迹聚合物对水溶液中Sr(Ⅱ)有良好的吸附性能,饱和吸附容量为凹凸棒石的3.71倍,凹凸棒石表面离子印迹聚合物对Sr(Ⅱ)的识别性为凹凸棒石的3.0倍以上,为进一步建立专属性核废物处理模型提供了依据。
Using Sr (Ⅱ) as a template, chitosan as a functional substance, attapulgite as a carrier and γ- (2,3-epoxy propoxy) propyltrimethoxysilane as a coupling agent, the surface molecular imprinting technique and sol Preparation of ion-imprinted polymer on attapulgite surface by gel method. Fourier transform infrared spectroscopy (FTIR) was used to characterize the attapulgite and its surface ion imprinted polymers. The effects of pH value, adsorbent dosage and standing time on the adsorption behavior of attapulgite and its surface were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy. Their saturated adsorption capacity and adsorption efficiency were investigated. The adsorption mechanism of attapulgite and its surface ionomer on Sr (Ⅱ) in aqueous solution was studied. The results show that the ion-imprinted polymer on attapulgite surface has good adsorption ability to Sr (Ⅱ) in aqueous solution under the optimal conditions, the saturated adsorption capacity is 3.71 times that of attapulgite, and the ionomer imprinted on the surface of attapulgite The recognition of Sr (Ⅱ) is more than 3.0 times that of attapulgite, which provides a basis for further establishment of a specific nuclear waste disposal model.