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《Journal of Synthetic Crystals》 2009-01
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Preparation and Characterization of ZnWO_4 Nanocrystals

WANG Jin-ying,HUANG Miao-liang,ZHONG Qi-quan,LIN Jian-ming,WU Ji-huai (The Key Laboratory for Functional Materials of Fujian Higher Education,Institute of Material Physical Chemistry,Huaqiao University,Quanzhou 362021,China)  
ZnWO4 nanocatalysts were prepared by a hydrothermal method using Na2WO4·2H2O and Zn(NO3)2·6H2O as raw materials.The photocatalytic activities were evaluated by using Eosine B as photodegradation target.The effects of hydrothermal temperature,time and solution pH on the crystallinity,morphology and photocatalytic activities of ZnWO4 catalyst were investigated.The result shows that ZnWO4 nanoparticles self-assembled into plate-built chains through oriented aggregations in pH=5,while ZnWO4 nanorods formed via the thermodynamically control process in pH=8.At 180 ℃ for 24 h,pH=5 and pH=8,the catalyst reaches the high photocatalytic activity with Eosine B removal efficiency of 86%,95% within 2 h,respectively.The solution pH,crystalline morphology and specific surface area are the factors affecting the photocatalytic activity.
【Fund】: 国家自然科学基金(No.50082003 50372022);; 国务院侨务办公室科研基金(No.07QZR06);; 福建省自然科学基金(E0640003)
【CateGory Index】: O643.36
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