摘要
采用沉淀法制备的铁氧化物催化剂，催化氧化含苯酚水溶液与H2O2的反应，考察了反应温度、H2O2浓度和溶液pH值对苯酚降解的影响，并用紫外光谱、高效液相色谱对反应过程进行了研究分析，结果表明，非晶铁氧化物催化剂在催化氧化降解苯酚时具有较高的催化活性，在溶液pH5．0±0．5，反应温度60～65℃条件下，有很好的降解效果；苯酚降解的中间产物有：对苯二酚、邻苯二酚、苯醌和低级脂肪酸；其降解机理是羟基自由基攻击苯环上OH的邻位或对位，并使苯环开环，生成低级脂肪酸，最终转化成二氧化碳和水，从而使苯酚得以降解；该降解反应符合准一级反应动力学．
It is reported that phenol in wastewater was degraded by H2O2 with iron oxide as catalyst prepared by deposition. The effects of temperature, pH and H2O2 concentration were investigated. The process of phenol degradation was studied with UV absorption spectrum and high performance liquid chromatogram（HPLC）. The results show that the amorphous iron oxide has a highly catalytic activity and the degradation ratio of COD （Chemical Oxygen Demand） reach maximum in the pH value range from 4.5 to 5.5 and temperature range from 60 ℃ to 65 ℃. The intermadiate products are pyrocatechin, hydroquinone, benzoquinone and low-grade fatty acid. The mechanism of catalyst oxidation is that the free radical · OH attack benzene cycle at the adjacent position and para position of OH on phenol. The benzene cycle is opened and low-grade fatty acid is produced. Then they transformed into CO2 and H2O. The reaction kinetic of phenol degradation was according with pseudo-first order reaction kinetic model.
出处
《武汉大学学报（理学版）》
CAS
CSCD
北大核心
2006年第4期431-434,共4页
Journal of Wuhan University:Natural Science Edition
基金
北京市自然科学基金资助项目(2042018)
北京交通大学"十五"科技专项基金资助项目(2005sm060)
