半胱氨酸改性介孔材料对Hg(Ⅱ)高选择性分离富集性能研究  

A New L-Cysteine-Functionalized Mesoporous Composite and Its High Selectivity Separation and Enrichment Properties for Hg(Ⅱ)

作　　者：李青[1,2] 汪正[2] 朱燕[2] 邹慧君[2] 屈海云[2] 方冬梅[2] 胡慧廉[1] 杜一平[1] 

机构地区：[1]上海市功能性材料化学重点实验室,华东理工大学,上海200237 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《分析化学》2013年第1期93-97,共5页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(No.21175145);上海市科学技术委员会项目(No.09142201800)资助

摘　　要：采用后移植方法,将半胱氨酸键入到介孔材料SBA-15上,并对此材料的吸附条件进行了优化,研究了其对重金属离子Hg2+的富集特性。考察了溶液pH值、吸附时间和材料用量等因素对Hg2+吸附率的影响。在pH 2.5,性质相近的金属离子Cu2+、Cr6+、Cr3+、Cd2+共存时,半胱氨酸改性的SBA-15介孔材料对Hg2+可进行选择性吸附富集,富集后可用含5%硫脲的1 mol/L HCl溶液快速洗脱。方法对Hg2+的检出限为0.07μg/L,相对标准偏差为2.2%(CHg2+=1.0 mg/L,n=11)。将本方法用于污水样品中Hg2+的测定,回收率为92%～101%。A L-cysteine-functionalized mesoporous composite was prepared and modified by post-grafting method. The adsorption conditions were optimized and the adsorption property of the composite for Hg2＋ was investigated. Effects of medium pH, adsorption time, and adsorbent dosage on Hg2＋ adsorption were studied. The L-cysteine-functionalized mesoporous SBA-15 can selectively adsorb Hg2＋ at pH 2.5 in case of the coexis- ted Cu（lI）, Cr（VD, Cr（llI）, Cd（lI）. Hg2＋ can be quickly eluated from the composite with a solution of 5% thiourea in 1 moL/L HC1. The detection limit for Hg2＋ was 0.07 μg/L, and the relative standard deviation （RSD） was 2.2% （CHg2=1. 0 mg/L, n= 11 ）. The presented procedure has been applied to the Hg2＋ determination in waste water with the recovery in the range of 92%-101%.

关 键 词：半胱氨酸 介孔材料 Hg2+ 选择性 分离富集 

分 类 号：O647.32[理学—物理化学]