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以Na2WO4.2H2O和Zn(NO3)2.6H2O为原料,采用微波水热法在不同pH值下200℃反应60 min制备出ZnWO4粉体。分析了pH值对合成样品的物相、形貌和比表面积的影响,并对不同pH值下合成粉体的光催化性能进行了研究。结果表明:pH值为5.0～7.5时适宜合成ZnWO4粉体,pH为5.0、6.0和7.5时分别合成了星状、颗粒状及纤维状ZnWO4粉体;制备出的ZnWO4粉体比表面积分别为15.79、28.12m2/g和54.27 m2/g;随着ZnWO4粉体比表面积的增加,ZnWO4粉体光催化性能随之提高,其中pH=7.5时合成的纤维状的ZnWO4粉体比表面积最大,在紫外光下,2h的光催化降解罗丹明B降解率达到了98.5%。
Using Na2WO4.2H2O and Zn (NO3) 2.6H2O as raw materials, ZnWO4 powders were prepared by microwave hydrothermal reaction at 200 ℃ for 60 min under different pH values. The effects of pH value on the phase, morphology and specific surface area of the synthesized samples were analyzed. The photocatalytic properties of the synthesized powders at different pH values were also studied. The results showed that ZnWO4 powders were synthesized at pH 5.0-7.5, and star-shaped, granular and fibrous ZnWO4 powders were synthesized at pH 5.0, 6.0 and 7.5, respectively. The specific surface areas of prepared ZnWO4 powders were 15.79 , 28.12m2 / g and 54.27 m2 / g, respectively. With the increase of specific surface area of ZnWO4 powders, the photocatalytic activity of ZnWO4 powders increased. The specific surface area of ZnWO4 powders synthesized at pH = 7.5 was the highest, Under light, the degradation rate of Rhodamine B reached 98.5% after 2 hours.