研究论文
王思雨,谭欣,于涛.TiO2-石墨烯（Gn）复合材料光催化降解O3研究[J].环境科学学报,2014,34(2):325-330
TiO2-石墨烯（Gn）复合材料光催化降解O3研究
- Preparation of TiO2/graphene composites materials for photocatalytic degradation of O3
- 基金项目：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）
- 作者
- 单位
- 王思雨
- 1. 天津大学环境科学与工程学院, 天津 300072
- 谭欣
- 1. 天津大学环境科学与工程学院, 天津 300072;2. 天津大学化工学院, 天津 300072
- 于涛
- 2. 天津大学化工学院, 天津 300072
- 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.
- Abstract：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 O3 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 O3 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 O3 concentration was (0.150~0.200)×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 O3 concentration was (0.950~1.000)×10-6. While under the lower concentrations ((0.100~0.150)×10-6), the O3 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.
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