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《Environmental Chemistry》 2003-04
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STUDIES ON THE PHOTODEGRADATION OF DIRECT BLUE ON NANOSIZED TITANIA

HUANG Li hua ZHAO Feng CHEN Jian min (Department of Environmental Science and Engineering,Fudan University,Shanghai,200433) ZHU Meng qin (Key Laboratory for Preparation and Application of Ultra fine Materials of Ministry of Education, East China University of Science and Technology,Shanghai,200237)  
The ultra fine nanosized TiO 2 photocatalysts were prepared by the hydrolysis of Ti(OC 4H 9) 4 solution and calcined at different temperatures.The catalysts were characterized by XRD,TEM.Direct blue was photodegradated rapidly in the presence of self prepared TiO 2 particles calcined from 400-550℃. It has been proved that the principal ultimate products of the photodegradation of direct blue are CO 2,H 2O and other mineral compounds.We have also confirmed that the catalyst calcined at 475℃ which was in anatase phase showed the highest photoactivity.In order to study the influence of the initial pH value of solutions on the photoassisted reaction,four different solutions were tested(pH value was 4 50,5 24,6 45 and 7 52,respectively).The result showed that decreasing pH value is in favor of the reaction.In the meanwhile,the degradation efficiency of COD Cr of the solution is 88%.All these results indicated that this process has potential applications to the elimination of direct blue in the wastewater.
【Fund】: 国家教育部归国留学人员基金资助项目
【CateGory Index】: X791
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