以硝酸锌、氢氧化钠、硝酸铈为原料,采用沉淀法制备了一系列Ce掺杂的Ce/ZnO分级结构微球。采用X射线衍射仪、场发射扫描电子显微镜、能量色散谱仪和紫外-可见漫反射光谱仪等对样品进行表征。以甲基橙的光催化降解为模拟反应,考察了Ce掺杂量对Ce/ZnO分级结构微球光催化性能的影响。结果表明:Ce/ZnO分级结构微球由ZnO微纳米片相互交错构建而成,Ce的掺杂提高了Ce/ZnO分级结构微球的光催化活性,其中Ce摩尔分数为1.5%的Ce/ZnO对甲基橙的光催化降解效果最好,紫外光照射60min甲基橙降解率为98.3%,循环使用4次,其催化活性未明显下降。
A series of hierarchical Ce-doped ZnO (named as Ce/ZnO) microspheres were prepared by a precipitation method using zinc nitrate,sodium hydroxide and cerium nitrate as raw materials.The X-ray diffraction (XRD),field-emission scanning electron microscopy (FESEM) equipped with energy dispersive spectrometer (EDS),and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis-DRS) were used to characterize the structure,morphology and absorption spectra of Ce/ZnO.The effect of the doping amount of Ce on the photocatalytic activity was investigated by the degradation of methylene orange (MO) aqueous solution.The results showed that the microspheres were constructed with some ZnO microplatelets staggered on each other.Ce doping improved the photocatalytic activity.The degradation of MO reached up to 98.3% after 60min of illumination over Ce/ZnO with Ce/ZnO molar ratio of 1.5%,which exhibited the optimal photocatalytic performance and showed no significant decrease of photocatalytic activity after repeatedly used for 4 times.
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基金资助
国家自然科学基金地区基金项目(21261003)
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