Efficient degradation of dye pollutants using dioxygen mediated by iron(Ⅱ) 2,2′-bipyridine loaded layered clay catalyst under visible irradiation  

作　　者：CHENG Mingming1,SUN Zhenying1,2,MA Wanhong1,CHEN Chuncheng1,ZHAO Jincai1 & WANG Zhengping2 1. Laboratory of Photochemistry,Center for Molecular Science,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100080,China 2. Department of Chemical Engineering,Harbin Engineering University,Harbin 150001,China 

出　　处：《Science China Chemistry》2006年第5期407-410,共4页中国科学（化学英文版）

基　　金：This work was supported financially by the Ministry of Science and Technology of China (Grant No. 2003CG415006); the National Natural Science Foundation of China (Grant Nos. 20537010, 50436040 & 20520120221).

摘　　要：The organic-inorganic layered solid catalyst Fe(bpy)_3^(2+)-laponite was ableto photode-grade Rhodamine B (RhB) by activation of dioxygen under visible irradiation (λ 】 420nm), while the homogeneous aqueous solution Fe(bpy)_3^(2+) showed no photoactivity. The catalystcould be repeatedly used and retained its reactivity. The hybrid catalyst could be separated fromthe suspension by centrifugation or sedimentation. The TOC removal yield of RhB was measured.Reactive oxygen species (ROS) formed during degradation was detected by EPR. A possible mechanismwas proposed on the basis of the experimental results.The organic-inorganic layered solid catalyst Fe(bpy)32 +-laponite was able to photode-grade Rhodamine B (RhB) by activation of dioxygen under visible irradiation (λ> 420 nm), while the homogeneous aqueous solution Fe(bpy)32 + showed no photoactivity. The catalyst could be repeat-edly used and retained its reactivity. The hybrid catalyst could be separated from the suspension by centrifugation or sedimentation. The TOC removal yield of RhB was measured. Reactive oxygen species (ROS) formed during degradation was detected by EPR. A possible mechanism was pro-posed on the basis of the experimental results.

关 键 词：laponite  RHODAMINE B  molecular oxygen  VISIBLE light. 

分 类 号：O621.2[理学—有机化学]