摘要
通过改性Hummer法及溶胶凝胶法,制备出TiO2-石墨烯光催化复合材料.经吸附-光催化活性实验选出光催化活性最高的含C量为1.5%(质量分数)的TiO2-石墨烯复合材料,并在自行设计的模拟大型客机环境的气相光催化反应器中,进行O3光催化降解实验研究.结果表明,TiO2-石墨烯复合光催化材料在较短时间内对O3有较高的降解效率,且其光催化活性显著优于纯TiO2材料.初始O3浓度为(0.150～0.200)×10-6时,复合光催化剂受紫外光激发60 min的光催化降解率为66.12%,初始O3浓度为(0.950～1.000)×10-6时,其光催化降解率约为77%,较低浓度时((0.100～0.150)×10-6),O3去除率也能达到45.45%.此外,通过探讨光催化材料的重复使用性能,表明复合光催化剂重复使用4次以内,其对O3的光催化降解率保持基本稳定.
The TiO2-graphene composite photocatalytic were synthesized by modified Hummers＇ method and the sol-gel method. The highest photocatalytic activity of TiO2-graphene was selected by adsorption-photocatalytic activity experiments, and confirmed that the 1.5wt% of C content is the material. The 03 photocatalytic degradation experiments were conducted in the self-designed gas-phase photocatalytic reactor, which was modeled on the large passenger aircraft. Experimental results showed that 03 can be more efficiently removed by TiO2-graphene composite photocatalyst materials and its photocatalytic degradation activity was significantly higher than pure TiO2 material. The initial 03 concentration was （ 0. 150 - 0. 200 ） x 10 -6, the composite photocatalyst was excited under UV for 60 min and the photocatalytic degradation rate could be 66.12%. Besides, the degradation rate would rise to about 77%, when the initial 03 concentration was （0.950 - 1. 000） x 10-6. While under the lower concentrations （ （0. 100 -0. 150） x 10-6 ） , the 03 removal rate dropped to 45.45%. In addition, the photocatalytic materials could be stable to photocatalytic degradation of O3 , if the composite was reused less than 4 times.
出处
《环境科学学报》
CAS
CSCD
北大核心
2014年第2期325-330,共6页
Acta Scientiae Circumstantiae
基金
国家自然科学基金项目(No.20976128)
国家重点基础研究发展计划项目(No.SQ2011CB086091)~~
