自然光下羟基氧化铁处理水溶液中甲基橙的研究  

Degradation of Methyl Orange in Water System under Visible Light By Photocatalysis of Iron Oxyhydroxides

作　　者：吴吉权[1] 孙振亚[1] 蒋蓉[2] 于红[1] 余建洋[1] 

机构地区：[1]武汉理工大学资源与环境工程学院,武汉430070 [2]武汉理工大学材料研究与测试中心,武汉430070

出　　处：《矿物岩石地球化学通报》2006年第4期299-303,共5页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(40372028);武汉理工大学基金资助项目

摘　　要：自然界广泛存在羟基氧化铁,研究其在地质中的光催化作用对环境的污染防治有着重要意义。在自然光照下,用针铁矿和四方纤铁矿处理甲基橙溶液,不同反应时间取样经高速离心后,用紫外/可见分光光度计和傅立叶变换显微红外光谱仪(FTIR)进行分析。结果表明,FeOOH/Visible light体系能使甲基橙溶液脱色率达83%,四方纤铁矿比针铁矿有更好的光催化降解效果;FeOOH/Visible light体系能将甲基橙分子中的偶氮键打开,从而使溶液脱色,FeOOH/Visible lihgt/H2O2则能进一步降解甲基橙,使其分子中的苯环部分打开。Iron oxyhydroxides are widely existed in natural environment. To study their photocatalysis in geological environment is important for preventing environmental pollution. Two nanometer sized oxyhydroxides of α-FeOOH and β-FeOOH are selected to degrade methyl orange in water system under visible light in this study. Samples, collected from the solution at different reaction times, were centrifugalized first and then analyzed by UV-vis spectrometry and FTIR spectrometry respectively. The results show that decoloration rate of methyl orange in solution can be up to 83 % in FeOOH/Visible light system, the photocatalysis of β-FeOOH on methyl orange is more effective than that of α-FeOOH. The FeOOH/Visible light system can break the azo bond and decolor the methyl orange in solution. The phenyl in methyl orange molecule can be partially degraded in the FeOOH/Visible light/H2O2 system.

关 键 词：氧氢氧化铁 光催化氧化 红外光谱 

分 类 号：X703[环境科学与工程—环境工程]