复合纳米TiO_2净化典型室内空气污染物初步研究

PRELIMINARY STUDY OF THE PURIFYING EFFECTS OF NANOSIZED TITANIUM DIOXIDE COMBINED WITH METAL OXIDE ON TYPICAL INDOOR AIR POLLUTANTS

目的研究 1 0种室内典型空气污染物的光催化净化新方法 ,为进一步研制空气净化装置奠定实验基础。方法将纳米级TiO2 复合某种金属氧化物制成光催化剂 ,在紫外灯光照下净化 ,测定污染物的消除率。结果组方为 93%TiO2 +7%金属氧化物的光催化剂对有害气体的净化效果最佳 ,对H2 S的净化率在 97%以上 ,对SO2 的净化率在 99%以上 ,对NO2 、NH3能够全部消除 ,对CS2 的平均净化率为 81 .3% ,对苯平均消除率仅为 8.8% ,对甲苯平均消除率仅为 1 8.8% ,对二甲苯平均消除率仅为 4 1 .6 %。结论研制的光催化剂 ,可有效消除SO2 、H2 S、NO2 、NH3、CS2 等有害气体。但对苯系物及CO、CO2 等催化效率较低或没有效果 。

Objective To study a new method for photocatalysis degradation of typical indoor air pollutants,so as to provide experimental basis for developing air purifier. Methods Complex nanosized titanium dioxide photocatalyst was prepared to degrade the harmful gases under UV irradiation. The purifying rates were measured. Results The photocatalyst containing 93% nanosized TiO 2 and 7% metal oxide had the best purifying effects. The average purifying rates were 97% for H 2S, 99% for SO 2, 100% for NO 2 and NH 3, 81.3% for CS 2, 8.8% for benzene, 18.8% for toluene, 41.6% for xylene. Conclusion The developed photocatalyst could effectively purify NO 2, SO 2, NH 3, H 2S, CS 2 but not CO, CO 2, benzene, toluene and xylene.Further study to improve the degradation of these compounds is necessary.