沸石/TiO2光催化水泥基材料的降解性能研究

Study on Degradation Performance of Zeolite/TiO2 Photocatalytic Cement-Based Material

使用超声负压的方法制备出沸石/TiO2光催化剂,采用喷涂、掺入、露骨料的方法将此光催化剂负载到水泥基层制备出沸石/TiO2光催化水泥基材料,同时研究了不同光催化剂负载量对催化降解性能的影响。使用丙酮降解实验来测试沸石/TiO2光催化水泥基材料的催化降解性能,结果表明,采用喷涂方法制备的样品能够获得较好的催化降解性能,光催化剂的利用效率更高,当催化剂负载量为5%时,光催化水泥基材料对丙酮的降解率高达54. 5%。通过SEM-EDS观察沸石表面的微区形貌以及TiO2的分布情况,使用FTIR表征TiO2与沸石之间的结合方式,结果表明,TiO2均匀分布于沸石表面,并且与沸石建立了较强的化学键连接,有利于沸石/TiO2光催化水泥基材料的长期稳定的降解性能。

The ultrasonic negative pressure method was used to fabricate Zeolite/TiO2 catalyst.The Zeolite/TiO2 catalyst was loaded on the surface of cement matrix to prepare Zeolite/TiO2 photocatalytic cement-based material.Three loading methods were used:spraying,mixing and exposed aggregate.The effects of loading capacity of zeolite/TiO2 catalyst on photocatalytic degradation performance were explored.Acetone degradation experiment was used to test the degradation performance of zeolite/TiO2 photocatalytic cement-based material.The results of degradation experiment show that the samples fabricated by spraying zeolite/TiO2 catalyst have better degradation performance and higher utilization efficiency of photocatalyst.When the loading capacity of zeolite/TiO2 catalyst is 5%,the degradation rate of acetone is up to 54.5%.SEM-EDS was applied to observe the morphology of zeolite and the distribution of TiO2 on the surface of zeolite.FTIR was used to characterize the binding mode between TiO2 and zeolite.The results of SEM-EDS and FTIR show that nano-TiO2 are homogeneously dispersed on the surface of zeolite and strong chemical bond is established between zeolite and TiO2,respectively.