单 位：
徐州工程学院食品工程学院;江苏省食品资源开发与质量安全重点建设实验室
关键词：
离子印迹;纳米TiO_2;Cr(Ⅵ);富集;分离
摘 要：
[目的]研究离子印迹纳米TiO_2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TiO_2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TiO_2对0.30mg/mL的铬溶液在pH2.0、振荡30min、吸附剂用量0.30g时有较好的吸附效果,吸附率可达96.2%。用13mL1.0mol/L的HCl溶液洗脱40min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23.5mg/g,印迹物的特异性吸附量为6.92mg/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。
译 名：
Adsorption Properties of Ionic Imprinted Nano-TiO_2 on Cr(Ⅵ)
作 者：
ZHAO Rui;ZHANG Fan;MAO Jing-jing;LIU Hui;College of Food Engineering,Xuzhou Institute of Technology,Food Resource Development and Quality Safe Key Construction Laboratory;
关键词：
Ion imprinted;;Nano-TiO_2;;Cr(Ⅵ);;Enrichment;;Separation
摘 要：
[Objective] To research the adsorption properties of ionic imprinted nano-TiO_2 on Cr( Ⅵ).[Method]By using surface ion imprinted technique,Cr( Ⅵ) imprinted nanometer TiO_2 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 scanning electron microscopy( SEM) and static adsorption balanced experiment.[Result]This polymer had a good ability of adsorbing Cr( Ⅵ) under the condition of p H2,adsorption vibrating for 30 min and the 0. 30 g dosage. The adsorption rate could reach 96. 2%. When put in 13 m L of 1mol / L Na OH 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.
