Efficient inhibition of photogenerated electron-hole recombination through persulfate activation and dual-pathway degradation of micropollutants over iron molybdate
Efficient inhibition of photogenerated electron-hole recombination through persulfate activation and dual-pathway degradation of micropollutants over iron molybdate
复制标题
通过过硫酸盐活化和钼酸铁双途径降解微污染物，有效抑制光生电子空穴复合
DOI：
10.1016/j.apcatb.2019.117904
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发表时间：
2019-11-15
影响因子：
22.1
通讯作者：
Hu, Chun
中科院分区：
文献类型：
--
作者：
Wang, Liang;Huang, Xuan;Hu, Chun
长期以来，光生电子-空穴复合一直是光催化反应的瓶颈问题。在此，我们提出了一个有效的解决策略，通过捕获电子和空穴的环境因素。在本研究中，成功合成了纳米级钼酸铁(Fe-2(MoO4)(3))，并对其进行了表征，并将其用于非均相光联过硫酸盐（PS）活化（HPPA）工艺中去除微污染物。在该体系中，类芬顿氧化和光催化氧化的反应速率分别高出98倍和光催化氧化的59倍，这是由于HPPA过程具有较强的协同作用。在HPPA反应过程中，PS可以快速捕获光生电子生成硫酸盐自由基（SO4中心点-），在水中进一步转化为羟基自由基（(OH)- o中心点）。在PS的诱导下，富电子污染物能够主动捕获空穴并被氧化降解。这种协同过程不仅抑制了电子-空穴复合，而且通过自由基攻击和空穴氧化实现了污染物的快速双途径降解。
Photogenerated electron-hole recombination has been a bottleneck problem for photocatalytic reactions for a long time. Herein, we propose an efficient solution strategy through capturing electrons and holes with environmental factors. In this study, nanoscale iron molybdate (Fe-2(MoO4)(3)) was successfully synthesized, characterized and used in a heterogeneous photo-combined persulfate (PS) activation (HPPA) process for micropollutant removal. The reaction rate in this system was (similar to)98 and (similar to)59 times higher for Fenton-like and photocatalytic oxidation alone, respectively, which was attributed to strong synergistic effects of HPPA process. During the HPPA reaction, PS could quickly capture the photogenerated electrons to produce sulfate radicals (SO4 center dot-), which was further converted to hydroxyl radicals ((OH)-O-center dot) in water. Induced by PS, the electron-rich pollutants could actively capture the holes and be oxidized and degraded. This synergistic process not only inhibited the electron-hole recombination but also enabled rapid dual-pathway degradation of pollutants through free radical attack and hole oxidation.