【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。更多还原

【Abstract】 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.）更多还原