【作者】 李云垒； 武攀峰； 冯彩婷； 薛岗林；

【Author】 Yunlei Li;Panfeng Wu;Caiting Feng;Ganglin Xue;Department of Chemistry, Northwest University;

【机构】 西北大学化学与材料科学学院；

【摘要】 由于多酸具有类似于半导体的性质,应用于光催化在环境治理和清洁能源等方向得到越来越多的关注。多酸易溶于水,多被用作均相催化剂,存在着难以回收再利用的问题。本文将过渡金属取代的磷钼杂多酸阴离子[PMo₁₁M（H₂O）O₃₉]^5-（M=Co and Zn）与不同比例阳离子Ag⁺与Cs⁺结合制备成固态难溶盐Ag_5-xCs_x[PMo₁₁M（H₂O）O₃₉]作为非均相催化剂,探究了不同抗衡阳离子对光催化性能的影响。研究发现,随着Ag⁺比例的增加,其光催化活性随之增加。在抗衡阳离子全部为Ag⁺时,光催化活性最高。还制备了[PMo₁₁VO₄₀]^4-与Ag⁺结合生成固态难溶盐Ag₄[PMo₁₁VO₄₀]。探究了不同过渡金属对光催化性能的影响。其中Ag₅[PMo₁₁Zn（H₂O）O₃₉]表现出了最高的催化活性,模拟太阳光下3 h可将MO降解完全。研究发现回收后的催化剂有着更高的光催化活性。其原因是在光催化过程中Ag⁺被光照后原位生成了银纳米粒子,银纳米粒子的表面等离子体效应致使复合材料在可见光区的吸收明显增强,对模拟太阳光降解甲基橙表现出了比较高的活性。更多还原

【Abstract】 Since the polyoxometalates （POMs） has the similar properties to semiconductors,POMs has been used as a type of highly efficient photocatalysts in the field of environmental governance and clean energy.However,most of POMs are soluble in aqueous solution,which results in difficult separation of catalyst.Herein,the anions of transition metal mono-substituted phosphomolybdates[PMo₁₁M（H₂O）O₃₉]^5-（M=Co and Zn）combined with different proportion of Ag⁺and Cs⁺were prepared.The effects of different cations on photocatalytic properties were investigated.The results show that the photocatalytic activity gradually increased with the increasing proportion of Ag⁺.The insoluble salts of Ag₄[PMo₁₁VO₄₀]were also prepared.The effect of different transition metals on photocatalytic properties was investigated.Ag₅[PMo₁₁Zn（H₂O）O₃₉]exhibited the highest catalytic activity,and MO could be completely degraded after 3 h under simulated solar light irradiation.The recovered catalyst has higher photocatalytic activity than Ag₅[PMo₁₁Zn （H₂O） O₃₉].The reason is that in the process of photocatalysis,silver nanoparticles are generated in situ under irradiation.The plasmon of Ag nanoparticles can cause a significant absorption of visible light for catalysts,therefore these catalysts show higher catalytic activities for photodegradation of methyl orange under simulated solar light irradiation.更多还原