摘要
以纳米TiO2(产品型号为P25)为光催化剂,玻璃片为载体,在SGY1型多功能光催化反应器中对气相丙酮的光催化降解反应进行了研究.结果表明:随着反应体系中P25光催化剂用量的增加,丙酮的降解率逐渐增大;而P25用量达到一定值后,丙酮降解率略有降低,且用量为460mg,即载体上P25的面密度为1mg/cm2时,紫外光(uV)辐照1.5h后,丙酮的降解率最高,达92.7%;无催化剂存在时,丙酮几乎不发生光解;反应体系中水分子的存在及uV强度的提高均会加快丙酮的光催化反应速率,而采用同一催化剂降解反应操作6次后,催化剂有一定程度失活,表现为丙酮的光催化降解速率明显下降.
The photocatalytic degradation of gaseous acetone in a SGY-1 photoreactor was investigated by using nanoscale titanium dioxide (marked as P25) as the photocatalyst and glass as the substrate. The experimental results show that (1) the degradation rate of acetone gradually increases with the increasing of P25 dosage in the reaction system first, and then slightly decreases after the P25 dosage reaches a certain value, (2) the degradation rate of acetone reaches the maximum value of 92.7%,- after 1.5h of the uV irradiation when P25 amounts to 460mg on the surface of substrate, i.e. the surface density of P25 equals to 1mg/cm2, (3) there is hardly photolysis in the absence of the photocatalyst, (4) both the existence of water in the reaction system and the increase in uV light intensity can enhance the degradation rate of gaseous acetone, and (5) the degradation rate of acetone remarkably decreases due to the partial deactivation of the identical photocatalyst being used six times.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第5期83-86,共4页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(20176013)
关键词
纳米TIO2
光催化
丙酮
降解
nanoscale titanium dioxide
photocatalysis
acetone
degradation
