臭氧-二氧化钛光催化技术脱除硫化氢  

Removal of H_2S by O_3-TiO_2 photocatalytic technology

作　　者：赵士奇[1] 王磊[2] 王东辉[2] 金君素[1] 

机构地区：[1]北京化工大学化学工程学院,北京100029 [2]防化研究院第一研究所,北京100191

出　　处：《环境工程学报》2015年第11期5562-5566,共5页Chinese Journal of Environmental Engineering

摘　　要：在连续性反应器内以臭氧-光催化技术氧化硫化氢,证实了臭氧对光催化脱除硫化氢有促进作用,探讨了可能存在的主要基元反应和二氧化钛失活的原因,考察了反应温度、臭氧含量、硫化氢初始体积分数等因素对臭氧-光催化技术脱除硫化氢的影响。结果表明,臭氧在光催化作用下快速分解为活性氧离子或自由基,硫化氢在臭氧和光催化联合作用下快速氧化为二氧化硫,最终转化为硫酸;硫酸在二氧化钛表面的沉积使其催化活性降低,导致硫化氢和二氧化硫的转化率逐渐下降。研究还发现,当硫化氢的初始体积分数为100×10-6时,臭氧和硫化氢的最佳摩尔比约为2∶1;臭氧-光催化脱除硫化氢的最佳温度为70℃左右;降低硫化氢的初始体积分数可大幅度降低二氧化硫的选择性。H2S was removaled by O3-Ti O2 photocatalytic technology in a continuous reactor,and it was confirmed that ozone could improve the photocatalytic removal of H2 S. The oxidation step of hydrogen sulfide and reason of Ti O2 deactivation was discussed,the influences of reaction temperature,ozone content and H2 S initial concentration on H2 S removal were also studied. It＇s confirmed that O3 could catch electronic and quickly decompose at Ti O2 surface when irradiated by UV light,generating lots of active oxygen ions in the reactor. H2 S could be rapidly oxidized to SO2 under the effect of O3 and photocatalysis,SO2 then slowly converted to SO2-4.Ti O2 activity decreases due to deposition of SO2-4on catalyst surface,leading to the incomplete oxidation of H2 S and SO2. Results also show that the optimum mole ratio of O3/ H2 S is about 2∶ 1 when H2 S initial concentration is100 × 10- 6,the optimum reaction temperature is 70℃,and reduction of H2 S initial concentration would reduce SO2 selectivity.

关 键 词：臭氧 硫化氢 二氧化钛 光催化 二氧化硫 失活 

分 类 号：X512[环境科学与工程—环境工程]