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Photochemical fixation and reduction of sulfur dioxide to sulfide by tetraphenylporphyrin magnesium:Spectroscopic and kinetic studies

查看全文 作　　者：ZHANG [1]JianBin;LI [1]ChunPing;HUO [1]TianRui;LI [1]Qiang;ZHANG [1]Tong;WEI [2]XiongHui 高影响力作者 机构地区：[1]College of Chemical Engineering,Inner Mongolia University of Technology,Huhhot 010051,China;[2]Department of Applied Chemistry,College of Chemistry&Molecular Engineering,Peking University,Beijing 100871,China高影响力机构 出　　处：《Science China Chemistry》索引2012年第55卷第9期,共6页高影响力期刊 基　　金：supported by the Foundation of Inner Mongolia Autonomous Region’s Educational Commission(NJZZ11068);the School Scientific Research Fund (ZD201004,Inner Mongolia University of Technology,China);Yongfeng Boyuan Industry Co.,Ltd. (Jiangxi Province,China) 摘　　要：The photochemical reaction of sulfur dioxide(SO2) with tetraphenylporphyrin magnesium(MgTPP) has been investigated in dichloromethane(CH2Cl2) solution at room temperature with illumination by visible light.Conventional fluorescence,UV-vis,and MS spectral analyses showed that under these conditions,SO2 was initially photochemically fixed by MgTPP to form a 1:1 molecular adduct.On continued irradiation and maintaining the flow of SO2,MS and XRD results showed that MgTPP is remarkably effective in the photochemical reduction of SO2 to sulfide(S2).The kinetics of the photochemical reaction of MgTPP with SO2 was studied in a SO2-saturated solution.Under irradiation,the reaction follows pseudo first order kinetics for MgTPP,having a half-life decreasing from 106 to 57 min as the illumination intensity is increased from 350 to 600 Lm.This investigation of the photochemical fixation and reduction of SO2 by MgTPP is of key interest in elucidating fundamental photochemical reaction mechanisms associated with porphyrins in the presence of SO2 ;furthermore,the analysis of the photochemical reaction may offer new opportunities for the fixation and reduction of SO2 to less harmful species. 关 键 词：四苯基卟啉 一级动力学 二氧化硫 化学固定 硫化物 光谱学 光化学反应 镁
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