Ti-MCM-41分子筛的制备及对碱性染料的吸附  

Preparation of Ti-MCM-41 molecular sieve and its adsorption of basic dyes

作　　者：张建民[1] 刘悦[1] 李红玑[1,2] ZHANG Jianmin;LIU Yue;LI Hongji(School of Municipal Planning and City, Xi'an Engineering University, Xi'an 710048, China;School of Water Resources and Hydropower, Xi'an University of Technology, Xi'an 710048, China)

机构地区：[1]西安工程大学市政规划与城市学院,西安710048 [2]西安理工大学水利水电学院,西安710048

出　　处：《功能材料》2020年第11期11025-11030,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(21573171);陕西省教育厅专项科研计划资助项目(17JK0327);西安工程大学博士科研启动基金资助项目(BS201932)。

摘　　要：对凹凸棒石酸碱改性从而提取硅源,并以CTAB为模版剂,水热合成法制备了MCM-41介孔分子筛,为下一步改性分子筛的制备奠定了基础。接着采用溶胶凝胶法所制备的TiO2溶胶为Ti源,制备好的MCM-41作为载体,通过等体积浸渍法成功合成了改性介孔分子筛Ti-MCM-41。本试验采用的表征手段包括N2吸附-脱附、XRD及UV-Vis谱图,主要对改性后的Ti-MCM-41进行了样品表征以及表征结果分析。后将制备的介孔分子筛应用于对碱性染料MB的吸附实验,研究了介孔分子筛MCM-41和Ti-MCM-41的吸附时间对吸附过程的影响发现Ti-MCM-41具有更佳的吸附性能,并对其进行了吸附动力学以及等温曲线模型研究,结果得出Ti-MCM-41对MB的吸附符合拟二级动力学曲线,且属于Freundlich型吸附等温线。Acid-base modification of attapulgite was used to extract silicon source,and CTAB was used as the template agent to prepare MCM-41 mesoporous molecular sieve by hydrothermal synthesis.It laid the foundation for the next step in the preparation of modified molecular sieve.Then,the TiO2 sol prepared by the sol-gel method was used as the Ti source,and the prepared MCM-41 was used as the carrier.The modified mesoporous molecular sieve Ti-MCM-41 was successfully synthesized by the equal volume dipping method.The characterization methods used in this experiment include N2 adsorption-desorption,XRD and UV-Vis spectra,mainly for the modified Ti-MCM-41 sample characterization and characterization result analysis.Moreover,the prepared mesoporous molecular sieve was applied to the adsorption experiment of basic dye MB.The effect of the adsorption time of mesoporous molecular sieve MCM-41 and Ti-MCM-41 on the adsorption process was studied.It was found that Ti-MCM-41 had better adsorption performance.And the adsorption kinetics and isothermal curve model of the modified molecular sieve Ti-MCM-41 were also conducted.The results showed that the adsorption of Ti-MCM-41 to MB conformed to a quasi-second-order kinetic curve and belonged to the Freundlich type adsorption isotherm,which proved that the modified molecular sieve was mainly multi-molecular layer adsorption,accompanied by monomolecular layer adsorption.

关 键 词：MCM-41介孔分子筛 改性分子筛Ti-MCM-41 吸附 动力学 等温线 

分 类 号：O614[理学—无机化学]