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《Acta Scientiae Circumstantiae》 2014-04
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Anatase-TiO_2 photocatalyst for isothiazolone wastewater treatment

XIONG Zhixin;JIA Guozheng;YIN Zi;DING Lili;WAN Neng;REN Hongqiang;XU Ke;State Key Laboratory of Pollution Control and Resource Reuse,School of Environment,Nanjing University;Key Laboratory of MEMS of Ministry of Education,School of Electronics Science and Engineering,Southeast University;  
In this paper,anatase-TiO2 photocatalyst was synthesized to remove isothiazolone from wastewater effectively under natural light irradiation and its properties were analyzed by transmission electron microscopy( TEM),high-resolution TEM( HRTEM) and XRD. The optimal photocatalytic conditions for treating simulated isothiazolone wastewater were studied and the degradation metabolites of isothiazolone and the production of ·OH radicals in the solution by anatase TiO2 under natural light irradiation were evaluated. Results show that the synthesized anatase-TiO2,which possessed { 101} facet as the major exposed plane,exhibited high isothiazolone removal efficiency. When isothiazolone concentration was at 12 ~ 53 mg·L-1,97% ~100% of isothiazolone could be removed from wastewater after photoreaction with 677 mg·L-1of anatase-TiO 2 for 4 hours( from a 500 W Xe lamp); when the concentration of isothiazolone wastewater increased to 141 mg·L-1,77% ~80% of isothiazolone could be removed. The optimum reaction time was 4 h. The analysis of photoreaction metabolites indicated that MI was the major residual substance at the end of photocatatlytic reaction; CMI was degraded to chloride and MI. At the same time,another unknown intermediate was found after the degradation of isothiazolone.
【Fund】: 国家高技术研究发展(863)计划(No.2009AA063903);; 国家自然科学基金(No.61006011)~~
【CateGory Index】: X703
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