| 含Ce水滑石基复合氧化物对混合染料的光催化性能 |
| Photocatalytic Properties on Mixed-Dye by Ce-Contained Hydrotalcite-Derived Composite Oxides |
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| 摘要: 将具有光催化活性的CeO2和锌锡水滑石进行复合,经焙烧得到光催化性能较高的CeO2/ZnO/SnO2复合氧化物。通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和紫外-可见漫反射图谱(UV-VisDRS)技术对样品的晶体结构、表面形貌和光学性能进行表征,并利用密度泛函理论(DFT)计算样品的态密度,分析其电子能态结构。以甲基橙(MO)和亚甲基蓝(MB)的混合溶液(CMO:CMB=1:1)模拟染料废水,研究CeO2含量和焙烧温度对复合氧化物光催化降解混合染料的影响。结果表明:随着CeO2含量和焙烧温度的增加,复合氧化物的结晶度及对MO和MB的光催化活性得到增强;同时,复合氧化物对混合染料中MO的降解率优于MB。其中CeO2含量为20%,焙烧温度为700℃时的复合氧化物表现出最佳的光催化性能,对混合染料中MO和MB的降解率分别达到96.7%和95.0%。结合实验结果和理论计算,推测了混合染料中MO和MB的降解路径。 |
| 关键词: 水滑石 复合氧化物 光催化 混合染料 降解 密度泛函理论 |
| 基金项目: 国家自然科学基金(No.21503188)资助项目 |
| Abstract: ZnSn layered double hydroxides (ZnSn-LDHs) modified with CeO2 were successfully synthesized. And then, the materials were further calcined to make composite oxides (CeO2/ZnO/SnO2) with high photocatalytic properties. The crystal structure, morphology and optical performanc of samples were characterized by XRD, SEM, TEMand UV-Vis DRS, the density of states of samples were analyzed by Density Functional Theory (DFT). The effect of content of CeO2 and calcined temperature on photocatalytic properties of materials were investigated using mixed-dye of MOand MB (CMO:CMB=1:1) as the wastewater. The results showed that crystallinity became better with increasing of content of CeO2 and calcined temperature, which benefited for the improvement of photocatalytic performance; and the removal rate of MOis higher than that of MBin the mixed-dye. The photocatalyst containing20% CeO2, calcined at 700 ℃, displayed the best decomposition efficiency of mixed-dye. In this condition, about 96.7% and 95.0% of MOand MBwere degraded, respectively. In addition, based on the experimental results and theoretical calculations, the decomposition pathways for MOand MBwere also studied. |
| Keywords: layered double hydroxides composite oxides photocatalysis mixed-dye degradation density functional theory |
| 投稿时间：2015-10-23 修订日期：2016-02-07 |
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| 夏盛杰,邵蒙蒙,薛继龙,倪哲明.含Ce水滑石基复合氧化物对混合染料的光催化性能[J].无机化学学报,2016,32(6):983-993. |
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