以Na2WO4·2H2O和Zn(NO3)2·6H2O为原料,采用水热法制备出ZnWO4纳米晶催化剂.以曙红B为目标降解物,研究了ZnWO4催化剂的光催化性能,探讨了水热温度、水热时间和水热溶液pH值对ZnWO4催化剂的结晶形态及光催化活性的影响规律,结果表明:在酸性条件下制备的ZnWO4为片状结构,链状分布,而在碱性条件下为棒状结构.在180 ℃,24 h的制备条件下,ZnWO4催化剂显示出最高的光催化活性.水热溶液pH=5和pH=8时制得的催化剂在2 h内对5 mg/L的曙红B溶液的脱色率分别达到86%和95%.制备过程中溶液的pH值,催化剂的晶态和比表面积是影响催化剂活性的重要因素.
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