TiO2／ACF复合材料吸附-光催化降解甲醛的实验研究  

Experimental research on adsorption-photocatalytic degradation of formaldehyde by TiO_2/ACF composite material

作　　者：徐敏[1] 何满潮[1] 王岩[2] 闵延琴[2] 武成杰[2] 

机构地区：[1]中国矿业大学(北京),北京100083 [2]防化指挥工程学院,北京102205

出　　处：《中国安全生产科学技术》2008年第2期40-44,共5页Journal of Safety Science and Technology

摘　　要：甲醛作为对人类具有高致癌风险的有机污染物,对其工作场所的安全要求也越来越严格。其减少及脱除需要发展更加高效的技术手段。本文以甲醛为目标化合物,在自行设计的气相光催化反应器中,以254nm紫外灯作光源,研究其在TiO2/ACF复合材料上的吸附-光催化降解行为。探讨了甲醛的初始浓度,光照强度、空气湿度等对甲醛吸附-光催化降解效率的影响。初步探讨了甲醛的降解机理。结果表明:TiO2/ACF复合材料对甲醛具有极好的降解效果,较低浓度的甲醛,经2h光照,甲醛蒸气降解率达到99.9%(初始浓度为1.93mg/m3);甲醛降解率随空气湿度增加而明显增加,适当地水分加入有利于产生羟基活性自由基,促进催化降解反应。实验结果对降低污染区域工作人员的职业中毒风险有重要的意义。Working place need safety conditions according to industrial hygiene. Formaldehyde, as an organic compound with highly carcinogenic risk to humans, must be reduced and removed by more efficient technical means. Some behaviors of adsorption photo catalysis of formaldehyde on TiO2/ACF composite material were studied in photo-catalysis reactor. The wavelength of irradiation was 254nm. The degradation of formaldehyde affected by the initial concentration of the vapor, the irradiation intensity and air humidity was studied by the results of the experiments. The mechanism of degradation of formaldehyde was discussed briefly. The experiments showed that the new material had great effect on removing formaldehyde with low concentration. During two hours of photo-catalysis reaction, the ratio of degradation achieved 99. 9%, with initial concentration of 1.93mg/m^3. The ratio of degradation of formaldehyde increased distinctly with the increasing humidity. It was a good example that photocatalytic reaction would be accelerated while some water molecular was added in the system and parts of active hydroxyl yield while irradiation. The experimental result is very important for reducing occupational toxicosis of the workers within pollution area.

关 键 词：工业卫生 TiO2/ACF复合材料 吸附 光催化 甲醛 

分 类 号：X951[环境科学与工程—安全科学]