Effect factors of benzene adsorption and degradation by nano-TiOimmobilized on diatomite

Abstract

Difference between adsorption of benzene by diatomite and nano-TiOimmobilized on diatomite was investigated. And effects of temperature, light intensity, relative humidity, and initial benzene concentration on adsorption and degradation of benzene by nano-TiOimmobilized on diatomite were also studied. The experimental results showed that when initial benzene concentration was 2.2×10-3 mg L-1, it could be degraded to below safe concentration (1.1×10-4 mg L-1) after 50 h when temperature was 20°C, but it just needed 30 h at 35°C. When light intensity was 6750 Lx, it needed 30 h for benzene to be degraded to below safe concentration, but benzene could barely be degraded without light. When relative humidity was 50%, benzene could be degraded to 1.0×10-4 mg L-1 after 30 h, while its concentration could be reduced to 7.0×10-5 mg L-1 at the relative humidity of 80%. © 2012 Lijun Cheng et al.