Abstract:

Using fly ash as the main raw material，fly ash-based MCM-41 molecular sieve was prepared by hydrothermal synthesis method，and TiO₂/MCM-41 composite with different TiO₂ content was prepared by using fly ash as the carrier. The material was characterized by XRD，XPS，SEM and UV-Vis DRS. The characterization results showed that the mesoporous pore of MCM-41 molecular sieve provided a good environment for TiO₂ growth，and effectively prevented the aggregation of TiO₂ grains to form uniform grains，reducing the length of particle size results in blue shift of absorption band. It was used as a catalyst to study the catalytic degradation of tetracycline. The effects of catalyst dosage，initial concentration of tetracycline （TC） and initial pH on the photocatalytic reaction were investigated. The results showed that the catalyst with 32%TiO₂ content had the best catalytic effect at pH 6.8，catalyst dosage 0.2 g/L and initial concentration of TC 30 mg/L. The degradation process of tetracycline conformed to the pseudo-second-order kinetic equation.

Key words: fly ash, MCM-41, TiO₂, photocatalytic, tetracycline

摘要：

以粉煤灰为主要原料，采用水热合成法制备粉煤灰基MCM-41分子筛，并以此为载体，制备不同TiO₂质量分数的TiO₂/MCM-41复合材料，采用XRD、XPS、SEM和UV-Vis DRS等对材料进行表征，结果表明，MCM-41分子筛的介孔孔道为TiO₂生长提供了良好环境并有效阻止了TiO₂晶粒的团聚，使之形成均匀的晶粒，减小粒径长度产生吸收带蓝移。将其作为催化剂用于对四环素（TC）的催化降解研究，考察了催化剂投加量、TC初始质量浓度及初始pH等对光催化反应的影响。结果表明，TiO₂质量分数为32%的催化剂在pH为6.8、催化剂投加量为0.2 g/L和TC初始质量浓度为30 mg/L时的催化效果最优，TC的降解过程符合拟二级动力学方程。

关键词: 粉煤灰, MCM-41, TiO₂, 光催化, 四环素

CLC Number: 

• X703.1