介孔分子筛富集紫外可见法测定废水中重金属汞  

Determination of Mercury in Wastewater Using Spectrophotometric Method after the MCM-41 Enrichment

作　　者：赵曦曦[1] 罗勇 张立科[1] 赵飞[1] 

机构地区：[1]许昌学院化学化工学院,河南许昌461000 [2]河南中烟工业有限责任公司驻马店卷烟厂,河南驻马店463000

出　　处：《许昌学院学报》2013年第2期88-92,共5页Journal of Xuchang University

基　　金：河南省教育厅自然科学研究指导计划项目(2010B150031);许昌学院科研基金项目(2011B022);许昌学院优秀青年骨干教师资助项目

摘　　要：以十六烷基三甲基溴化铵为模板,正硅酸乙酯为硅源,在碱性条件下通过水热法先合成MCM-41分子筛.利用介孔分子筛的吸附性能对微量汞进行富集盐酸解脱,考察了富集条件对富集效果的影响.结果表明,温度、pH值对介孔分子筛的富集效果影响最为明显,在温度为25℃、pH值为4.5时,富集效率可达90%以上.在吐温-80增溶条件下,汞与罗丹明B、溴化物发生显色反应形成络合物,建立了测定络合物的分光光度法.络合物的最大吸收峰为530 nm,表观摩尔吸光系数为5.42×105L/mol/cm.在50 mL溶液中,汞(Ⅱ)浓度在2.000×10-4～1.800×10-1mg/L范围内符合比尔定律,线性回归方程Y=2.736 9X-0.000 1,相关系数R=0.9996.该方法灵敏度高,选择性好.The ordered mesoporous material MCM-41 was synthesized by a hydrothermal method using ethyl- orthosilicate and cetyl trimethl ammonium bromide. Using adsorption performance of the mesoporous material to extricate mercury through hydrochloric acid concentration, the influences of concentration conditions on concen- tration effects are inspected. The result shows that the influence of temperature and the pH value on concentra- tion effect of the mesoporous material is the most obvious. When the temperature is 25 ℃, the pH value is 4.5, concentration efficiency can reach above 90%. Under the condition of Twain-80 increasing solubility, the mercu- ry and rhodamine B, the bromide has the color reaction to form the complex compound, establishes spectrophoto- metric method which can determinate complex compound. The complex compound biggest absorption peak is loca- ted 530 nm, apparent mole of extinction coefficient for 5.42 × 105 L ~ mol- 1 . cm-1. In 50 mL solution, the den- sity of Hg（ Ⅱ ） conforms to the Bill law in 2. 000 × 10-4 - 1. 800 × 10-1 mg · L-1scope, the equation of motion is Y = 2. 736 9X - 0. 0001, correlation coefficient R = 0. 9996. The sensitivity of this method is high and the se- lectivity is good too.

关 键 词：介孔分子筛 富集 汞 紫外-可见分光光度法 

分 类 号：O657.32[理学—分析化学]