摘要
以硝酸锌、氢氧化钠为原料,通过微乳法制备得到ZnO纳米棒,然后采用光化学法在ZnO纳米棒表面负载Ag2O纳米颗粒,成功制备了复合光催化剂ZnO/Ag2O。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)、透射电镜(TEM)与紫外可见漫反射(UV-Vis)等手段对样品物相、形貌、元素组成及光学性质进行了表征。并分别在紫外光和可见光条件下,以亚甲基蓝(MB)为模拟污染物评价了催化剂的催化活性。结果表明,与Ag2O耦合后,ZnO的光催化活性得到了明显的提高。ZnO/Ag2O复合光催化剂对亚甲基蓝的紫外光和可见光光催化降解速率分别为ZnO的7.4倍和8.5倍。文章还初步探讨了Ag2O引入对ZnO光催化活性的影响机理。
ZnO nanorods were prepared by microemulsion method with zinc nitrate and sodium hydroxide as the raw materials.And then the ZnO/Ag2O composites were successfully synthesized via a simple photochemical route.The samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and energy dispersive X-ray spectroscopy(EDS)and UV-Vis spectrophotometer(UV-Vis).Photocatalytic activity toward degradation of a methylene blue(MB)aqueous solution under ultraviolet(UV)light and visible light was investigated.The results showed that the as-prepared ZnO/Ag2O nanocomposites significantly enhanced photocatalytic activity compared with pure ZnO and Ag2O.In particular,the rates of degradation using the as-prepared ZnO/Ag2O nanocomposites were 7.4 and 8.5 times faster than that using bare ZnO nanoparticle under UV and visible light irradiation,respectively.Finally,a possible photocatalytic mechanism was proposed.
作者
薛金娟
宗玉清
黄承娟
王明新
XUE Jinjuan;ZONG Yuqing;HUANG Chengjuan;WANG Mingxin(School of Environmental & Safety Engineering,Changzhou University,Changzhou 213164,China)
出处
《常州大学学报(自然科学版)》
CAS
2019年第5期49-55,共7页
Journal of Changzhou University:Natural Science Edition
基金
国家自然科学基金资助项目(21808019,41641032,41772240)
江苏省自然科学基金青年基金资助项目(BK20180958)