Ti-MCM-41分子筛对Cr（Ⅵ）的吸附性能

以发烟硅胶为硅源、钛酸四丁酯为钛源,采用水热合成法制备了一系列不同n（Si）∶n（Ti）的Ti-MCM-41分子筛,采用XRD、UV-Vis、BET及ICP技术对其进行了表征,考察了其对溶液中Cr（Ⅵ）的吸附性能及重复使用性能。结果表明：制备的Ti-MCM-41分子筛保持了MCM-41的介孔结构,但随着Ti含量的增加分子筛的比表面积、孔径和总孔体积均降低;在初始Cr（Ⅵ）质量浓度为100 mg/L、Ti-MCM-41分子筛（投料n（Si）∶n（Ti）为40）投加量为1 g/L、吸附时间为60 min、吸附温度为323 K、溶液pH为6的条件下,Cr（Ⅵ）吸附率可达96.3%;Ti-MCM-41分子筛对Cr（Ⅵ）的吸附符合Langmuir等温吸附模型;Ti-MCM-41分子筛的重复使用性能良好。

Adsorption abilities of Ti-MCM-41 molecular sieves to Cr（Ⅵ）

Using fumed silica as silicon source and tetrabutyl titanate as titanium source,Ti-MCM-41 molecular sieves with different n（Si）∶n（Ti） were prepared by hydrothermally synthesis method and characterized by XRD,UV-Vis,BET and ICP technologies. Their adsorption abilities to Cr（Ⅵ） in water and their reuse performances were studied. The results showed that：The Ti-MCM-41 molecular sieves retained the mesoporous structure of MCM-41,but with the increase of Ti content,the specific surface area,pore diameter and total pore volume decreased;The adsorption rate of Cr（Ⅵ） was 96.3% under the conditions of initial Cr（Ⅵ） mass concentration 100 mg/L,Ti-MCM-41 molecular sieves （n（Si）∶n（Ti）=40 in reaction） amount 1 g/L,adsorption time 60 min,adsorption temperature 323 K and solution pH 6;The adsorption of Cr（Ⅵ） on Ti-MCM-41 molecular sieves fitted the Langmuir isothermal adsorption model;The Ti-MCM-41 molecular sieves showed good reuse performance.