Cu掺杂TiO_2光催化降解室内甲醛气体的实验研究

Experimental Study on Photocatalytic Degradation of Indoor Formaldehyde Gas over Copper-doped Titania

采用溶胶-凝胶法合成了掺杂Cu的TiO2光催化剂,用环境测试舱模拟可见光下的室内环境,光催化降解其中的甲醛气体,最佳掺杂Cu量为2.0%(mol).Cu-TiO2光催化剂用量为1.5～2.5g/m3、甲醛气体初始浓度为1mg/m3时,降解环境测试舱内甲醛气体的效果最佳.与商用P25光催化剂相比,Cu-TiO2光催化剂在可见光区域降解甲醛的效果好,且重复多次使用后仍保持较好的光催化活性.

TiO2 nanocrystallite photocatalyst doped with Cu by sol-gel method was prepared,the optimal content of Cu in TiO2 was 2.0%（mol）.Its photocatalytic activity was determined,and removal effect of formaldehyde investigated by the photocatalytic decomposition of formaldehyde gas in the environmental chamber using a visible lamp.When the dosage of Cu-TiO2 photocatalyst was at 1.5～2.5 g/m3,and initial concentration of formaldehyde gas 1 mg/m3,the degradation of formaldehyde gas in the environmental chamber had the best effect.Compared with a commercially available P25 photocatalyst,the Cu-TiO2 photocatalyst in the visible range had good degradation of formaldehyde,and after repeated use,the photocatalyst was still kept in its good photocatalytic activity.