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聚丙烯酰胺凝胶法制备纳米ZnO颗粒及其光催化性能

DOI: 10.3969/j.issn.1001-8395.2015.02.022, PP. 264-269

Keywords: ZnO,聚丙烯酰胺凝胶法,光催化,纳米颗粒

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Abstract:

采用改进的聚丙烯酰胺凝胶法制备了高结晶度的纳米ZnO颗粒,用XRD、SEM、XPS、PL和UV-vis等对ZnO颗粒的结构、形貌、光学性质等进行了表征.结果表明样品为六角纤锌矿结构的ZnO;ZnO颗粒呈球形,尺寸在10~50nm之间;颗粒分布均匀,没有明显的团聚现象.UV-vis测试发现ZnO纳米颗粒在200~320nm波长范围存在强烈的吸收;PL测试发现在450~480nm波长范围内有很强的光致发光.在高压汞灯照射下,亚甲基蓝、甲基橙和罗丹明B分别在120、160和180min后降解率达到100%.ZnO纳米颗粒对亚甲基蓝、甲基橙和罗丹明B的降解符合一级动力学模型,亚甲基蓝、甲基橙和罗丹明B降解速率常数分别为0.0470、0.0210和0.0206min-1,最后讨论了不同有机染料结构对光催化降解速率的影响.

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