摘要
以微硅粉为硅源，CTAB和PEG-6000为模板剂，采用水热法制备MCM-41介孔分子筛，以该MCM-41为载体，将巯丙基三甲氧基硅烷引入到MCM-41的表面和孔道内，合成了巯基功能化的MCM-41介孔分子筛（SH-MCM-41），用XRD和FTIR对样品进行表征，以巯基功能化的样品为吸附剂，对含Cr207/2-的溶液进行静态吸附实验，结果表明，吸附量随初始浓度和温度升高而增加，当pH为1时吸附容量最大，达25．5mg／g，不同温度下Langmuir方程均呈现很好的拟合度，热力学平衡方程计算得△G〈0，△H=14．2kJ／mol，△S〉0，表明该吸附过程是自发的吸热和熵增加过程。
Using the silica fume as silica source, CTAB and PEG-6000 as template agent, the MCM-41 mesoporus silica materials were successfully synthesized. 3-Mercaptopropyl trimethoxysilane was introduced into the network of MCM-41 through post-grafting and thiol-functionalized MCM-41 mesoporous silica （SH-MCM-41） was obtained. The SH-MCM- 41 was characterized by XRD and FTIR. Cr2072- adsorption characteristics in water solution have been studied in static experiments with the SH-MCM-41 as adsorbent. The results showed that adsorption capacity of Cr2072- increased with increasing initial metal ion concentration and temperature. And its highest value was 25.5 mg/g at pH 1. Experimentaldata fitted well to the Langmuir model at all temperatures studied. The thermodynamic equilibrium functions were also determined. △G〈0, △H=14.2 kJ/mol, △S〉0, so the adsorption was spontaneous, endothermic and entropy increasing.
基金
国家自然科学基金项目（U1137601,21307046）,昆明理工大学分析测试基金项目（2011300）
