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PHOTOCATALYTIC DEGRADATION OF THE POLLUTANTS IN ACRYLIC FIBER WASTEWATER OVER TiO_2 NANOPARTICLES COATED ON CARBON NANOTUBES

XU Zhi-bing~(1, 2), ZHOU Jian-jun~2, WEI Xian-wen~1(1. Anhui Key Laboratory of Functional Molecular Solids, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China; 2. Department of Resorces and Environment , Anqing Normal College, Anqing 246011, China)  
The photocatalysts of TiO_2 nanoparticles attached on carbon nanotubes were prepared by the sol-gel method, which were characterized by XRD and TEM. The photocatalytic degradation of the pollutants in acrylic fibre wastewater was investigated with the photocatalysts TiO_2/carbon nanotubes composites, the results indicated that the photocatalysts posess high photocatalytic activity. When 100 mg TiO_2/carbon nanotubes composites were added into 250 mL of the acrylic fibre wastewater, the mixtures were irradiated by 300 W Hg lamp for 1 h, the efficiency of the reduction of COD_(cr) was 22%. The efficiency of the reduction of CODCr would turn to 90%, if the acrylic fibre wastewater was pretreated by Fenton reagent, then mixed with 150 mg TiO_2 / carbon nanotubes and photocatalyzed for 3 h. All the experimental results showed that the combination of Fenton reagent pretreatment and photocatalytic oxidation over TiO_2 / carbon nanotubes have an ideal effect, and it is valuable for practical applications.
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