磺胺吡啶在光助-二茂铁/H_2O_2非均相体系中的降解

抗生素在地表水中广泛检出,且可诱导细菌菌群抗药性,因而发展新型抗生素的去除技术势在必行。本研究基于二茂铁(Fc)良好的可逆化学特性、难溶于水、环境友好特性发展了一种光助-二茂铁/H_2O_2(Fc+H_2O_2+UV)氧化技术。以水环境中经常检出的磺胺吡啶为模型化合物,研究了磺胺吡啶在该氧化体系中的降解行为。研究结果发现,相对于常见的Fenton体系,磺胺吡啶在Fc+H_2O_2+UV体系中呈现出优异的降解效率。自由基淬灭实验发现·OH是主导磺胺吡啶降解的最主要活性物种。自由基探针实验证实Fc+H_2O_2+UV体系中存在电子转移过程,H_2O_2接受电子后产生·OH进而促进磺胺吡啶降解。

Degradation of sulfapyridine in ferrocene-catalyzed heterogeneous photo-Fenton system

Antibiotics are well-acknowledged micropollutants in surface water,and they can trigger an increase of resistant bacterial flora. Therefore,the removal of antibiotics is urgently needed. Based on the good reversible chemical properties of ferrocene(Fc),insoluble in water and environmental friendly properties,a kind of light assisted ferrocene/H_2O_2(Fc+H_2O_2+UV)oxidation technology has been developed in this study. Sulfapyridine(SP)was selected as target compound due to its widely detected in water. The effects of photodegradation behavior of SP in this system were investigated. Results show that compared with the common Fenton system,sulfadipyridine exhibits excellent degradation efficiency in Fc+H_2O_2+UV system. Radical scavenger experiment confirmed that the photogenerated ·OH was largely responsible for the photolytic enhancement of SP. Additionally,free radical probe experiments confirm the electron transfer process in Fc+H_2O_2+UV system,H_2O_2 underwent electron disproportionation to produce ·OH,which promoted the degradation of SP.