摘要
[目的]研究离子印迹纳米TiO2对Cr（Ⅵ）的吸附特性。[方法]采用表面离子印迹技术，在醋酸溶液中以重铬酸钾为模板，以壳聚糖为单体，以KH－560为交联剂，在纳米TiO2表面接枝制备Cr（Ⅵ）印迹聚合物，并通过扫描电镜、静态吸附平衡试验研究聚合物的结构、形貌特征及吸附特性。[结果]铬离子印迹纳米TiO2对0．30 mg／mL的铬溶液在pH 2．0、振荡30 min、吸附剂用量0．30 g时有较好的吸附效果，吸附率可达96．2％。用13 mL 1．0 mol／L的HCl溶液洗脱40 min即可将其脱附90％以上。在此优化条件下，印迹和非印迹物的饱和吸附容量分别为47．7和23．5 mg／g，印迹物的特异性吸附量为6．92 mg／g，最大富集倍数为100倍。样品加标回收率为95．7％～105．2％，RSD为1．90％～5．05％。[结论]Cr（Ⅵ）印迹聚合物具有良好的吸附性能，特异性吸附显著。
Abstract
Objective] To research the adsorption properties of ionic imprinted nano-TiO2 on Cr(Ⅵ).[Method] By using surface ion imprinted technique,Cr (Ⅵ) imprinted nanometer TiO2 was prepared in acetic acid solution,with K2Cr2O7 as template molecule,chitosan as the functional monomer,and KH-560 as cross-linker.Besides,the structure,appearance and adsorption properties of this polymer were studied by adopting scan-ning electron microscopy (SEM) and static adsorption balanced experiment.[Result] This polymer had a good ability of adsorbing Cr (Ⅵ) under the condition of pH 2,adsorption vibrating for 30 min and the 0.30 g dosage.The adsorption rate could reach 96.2%.When put in 13 mL of 1 mol/L NaOH solution for 40 minutes,the rate would reach 90%.The maximum adsorption capacity of the imprinted and non-imprinted polymer particles were 23.5 and 47.7 mg/g,respectively,and the selectivity of adsorption was 6.92 mg/g.The maximum enrichment multiple was 100. Adding standard recovery rate was between 95.7% and 105.2%,while the relative standard deviation (RSD) was between 1.90%and 5.05%. [Conclusion] Cr (Ⅵ) imprinted polymer has relatively good adsorption property and significant specific adsorption.
基金项目
江苏省食品资源开发与质量安全重点建设实验室开放项目(SPKF201413)
江苏省大学生创新创业训练计划项目(xcx2015074)
国家科技期刊平台
NSTL
维普
万方数据