Structural characterization and photocatalytic activity of NiO/AgNbO3
Structural characterization and photocatalytic activity of NiO/AgNbO3
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DOI：
10.1016/j.jallcom.2010.02.148
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发表时间：
2010-04
影响因子：
6.2
通讯作者：
Huoming Shu;Jimin Xie;Hui Xu;Hua-ming Li;Zheng Gu;Guangsong Sun;Yuanguo Xu
中科院分区：
文献类型：
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作者：
Huoming Shu;Jimin Xie;Hui Xu;Hua-ming Li;Zheng Gu;Guangsong Sun;Yuanguo Xu
采用湿法浸渍法制备了NiO/AgNbO 3复合材料。采用XRD、XPS、SEM-EDS和DRS等技术对催化剂的物理化学性能进行了表征。以亚甲基蓝染料为氧化物，考察了样品的光催化性能。XRD分析结果表明，在不同煅烧温度和不同NiO负载量下，钙钛矿型AgNbO 3均具有良好的晶相。XRD、XPS和SEM-EDS数据表明，NiO颗粒存在于纯AgNbO 3表面。DRS分析表明，NiO在AgNbO 3表面的形成促进了AgNbO 3在可见光区的光吸收，从而提高了AgNbO 3的光催化活性。结果表明，在紫外光和可见光照射下，NiO/AgNbO 3催化剂对亚甲基蓝（MB）的降解效率均高于纯AgNbO 3催化剂。当Ni含量为3wt%、焙烧温度为300°C、紫外光照射时间为3 h时，样品的光催化降解效率最高。
NiO/AgNbO3composites are prepared by wetness impregnation method. The physical and chemical properties of catalysts are characterized by XRD, XPS, SEM-EDS and DRS techniques. The photocatalytic performance of the samples is evaluated by photocatalytic oxidation of methylene blue dye under UV light irradiation. The results of XRD indicate that perovskite-type AgNbO3has a good crystal phase at different calcination temperatures and different NiO contents loaded. The XRD, XPS and SEM-EDS data indicate that NiO particles are presented on the surface of the pure AgNbO3. The DRS analysis shows that the NiO formed on AgNbO3surface promotes the optical absorption in the visible region and makes it possible to enhance the photocatalytic activity. The result reveals that the degradation efficiency of methylene blue (MB) over NiO/AgNbO3is higher than that of pure AgNbO3under UV light and visible light irradiation, respectively. The highest photocatalytic degradation efficiency is observed when the sample calcined at 300°C with 3wt% Ni content under UV light irradiation with 3h.