氧化锌的微观形貌调控及其光催化性能研究

Microscopic Morphology Control and Photocatalytic Performance of Zinc Oxide

为研究氧化锌的微观形貌对光催化性能的影响,研究了以硝酸锌为锌源,氢氧化钠为沉淀剂,采用直接沉淀法制备的不同微观形貌的氧化锌。通过X射线衍射仪(XRD)对氧化锌的物相结构进行分析,表明该方法可成功制备出氧化锌;采用扫描电镜(SEM)对制备出的氧化锌粉体微观形貌进行表征,结果表明随着氢氧化钠与硝酸锌摩尔比的增加,氧化锌粉体分别呈现出球状、花状和棒状构型。随后开展了氧化锌光催化降解柠檬黄效果实验,降解实验表明,氢氧化钠与硝酸锌的摩尔比为4时,制备的氧化锌粉体具有最好的光催化性能,当pH为6,氧化锌质量浓度为0.15 g/L时,在50 min内柠檬黄降解效率可达到99.47%。

In order to study the effect of micromorphology of zinc oxide on photocatalytic performance,zinc oxide with different micromorphology was prepared by direct precipitation method using zinc nitrate as zinc source and sodium hydroxide as precipitator.The phase structure of zinc oxide was analyzed by X-ray diffractometer(XRD),indicating that this method can successfully prepare zinc oxide.The micromorphology of prepared zinc oxide powder was characterized by scanning electron microscopy(SEM).The results showed that with the increase of the molar ratio of sodium hydroxide to zinc nitrate,the zinc oxide powder showed spherical,flower-like and rod-like configurations,respectively.The degradation experiment showed that when the molar ratio of sodium hydroxide and zinc nitrate was 4,the prepared zinc oxide powder had the best photocatalytic performance.When the pH was 6 and the mass concentration of zinc oxide was 0.15 g/L,the degradation efficiency of lemon yellow could reach 99.47%within 50 min.