Fe-Cu-MCM-41催化臭氧氧化体系对水中双氯芬酸矿化效果的研究

Research on Mineralization of Diclofenac in Aqueous Solution by Fe-Cu-MCM-41/O3 System

通过水热法合成铁、铜掺杂MCM-41(Fe-Cu-MCM-41)介孔分子筛,并将其应用于催化臭氧氧化水中双氯芬酸(DCF),以TOC浓度削减率表征矿化效果。研究了在催化臭氧氧化体系中,不同金属掺杂量、温度、初始pH值对DCF矿化效果的影响,并对比了不同催化剂(MCM-41、Fe-MCM-41、Cu-MCM-41、Fe-Cu-MCM-41)对DCF的矿化效果。结果显示,Fe-Cu-MCM-41有良好的催化活性,对DCF的矿化率为79.2%,比单独臭氧氧化高出36.9%。以亚硫酸氢根为抑制剂考察臭氧氧化与催化臭氧氧化DCF的过程,表明DCF的矿化过程遵循羟基自由基氧化机理。本研究对拓宽催化臭氧氧化技术在去除水中消炎药物污染方面的应用具有重要意义。

Fe-Cu-MCM-41 was successfully synthesized by a hydrothermal method and applied as a catalyst in ozonation for Diclofenac(DCF)in aqueous solution.Mineralization effect was characterized by TOC removal rate.The influence of different factors were investigated in catalysis ozonation system,such as different metal doped content,temperature,and initial pH.And mineralization effect was compared by different catalysts,such as MCM-41,Fe-MCM-41,Cu-MCM-41,and Fe-Cu-MCM-41.The result showed that,Fe-Cu-MCM-41 had good catalytic activity for DCF mineralization.TOC removal rate in Fe-Cu-MCM-41/O3 was 79.2%,which was 36.9%higher than that of ozonation alone.The presence of hydrogen sulfite obviously inhibit the DCF mineralization in ozonation and catalytic ozonation processes,indicating that mineralization of DCF in both processes followed the mechanism of oxidization by HO·free radical.This study is of great significance for broadening the application of catalytic ozonation technology in anti-inflammatory drugs removal in aqueous solution.