Efficient degradation of methyl orange via multilayer films of titanium dioxide and silicotungstic acid  

作　　者：NIU Ping HAO JingCheng 

机构地区：[1]Key Laboratory for Colloid and Interface Chemistry,Ministry of Education,Shandong University,Jinan 250100,China [2]Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong Province,Dezhou University,Dezhou 253023,China

出　　处：《Science China Chemistry》2012年第11期2366-2372,共7页中国科学（化学英文版）

基　　金：financially supported by the National Natural Science Foundation of China (21033005);the National Basic Research Program of China (973 Program, 2009CB930103);Natural Science Foundation of Shandong Province (2009ZRB01876)

摘　　要：We report layer-by-layer （LbL） assembly of TiO2 and H4SiW12O40 （SiW12） multilayer film on silicon wafers and glass slides for photocatalytic degradation of methyl orange （MO）. The photocatalytic efficiency of the obtained multilayer film increases along with the decrease of pH and salt concentration of the incubation solution. The results show that MO can be almost re- moved in pH 2.0 solution without salt addition in the first 60 min incubation when MO concentration is lower than 15 mg/L. Different salts show an apparent inhibitory effect on photocatalytic degradation of MO with the order of ZnC12〉KCI〉 NaC1〉LiCI. The TiO2/SiW12 multilayer film maintains photocatalytic activity even after five degradation cycles. The reaction of MO photodegradation accords with an apparent first-order dynamics.We report layer-by-layer (LbL) assembly of TiO2 and H4 SiW12 O40 (SiW 12 ) multilayer film on silicon wafers and glass slides for photocatalytic degradation of methyl orange (MO). The photocatalytic efficiency of the obtained multilayer film increases along with the decrease of pH and salt concentration of the incubation solution. The results show that MO can be almost removed in pH2.0 solution without salt addition in the first 60 min incubation when MO concentration is lower than 15 mg/L. Different salts show an apparent inhibitory effect on photocatalytic degradation of MO with the order of ZnCl2 >KCl> NaCl>LiCl. The TiO2 /SiW12 multilayer film maintains photocatalytic activity even after five degradation cycles. The reaction of MO photodegradation accords with an apparent first-order dynamics.

关 键 词：TIO2 silicotungstic acid LbL assembly photocatalytic degradation methyl orange 

分 类 号：TQ134.11[化学工程—无机化工] O484.43[理学—固体物理]