Glutathione, a kind of tripeptide with a thiol group, was introduced into the traditional Fenton system. It was found that target pollutant degradation is greatly improved when adding glutathione into the Fenton system, due to it accelerating the Fe(II)/Fe(III) cycle, thus generating more hydroxyl radicals. The variation of the concentrations of Fe(II) and H₂O₂ and the generation of HO· were monitored to verify the catalytic action of glutathione. Operating variables such as pH, molar ratios and different atmospheres were examined, and cyclic degradation experiments were performed to explore the stability of catalysts. Electrospray ionization mass spectrometry (ESI-MS) was used to determine the transformation of different forms of glutathione to explore the catalytic mechanism. More importantly, it was found that other thiol compounds can also promote the Fenton degradation through a cycle of thiol compounds and their oxidized forms. In conclusion, it is a cocatalyst based on the –HS/–S–S– cycle with hydroxyl radicals, which has not been reported previously.

中文翻译：

---

谷胱甘肽促进芬顿降解：一种基于–HS / –SS–S–循环并带有羟基的助催化剂

谷胱甘肽是一种带有硫醇基团的三肽，被引入传统的Fenton系统中。发现将谷胱甘肽添加到Fenton系统中后，目标污染物的降解得到了极大的改善，因为它可以加速Fe（II）/ Fe（III）循环，从而产生更多的羟基自由基。Fe（II）和H ₂ O ₂的浓度变化监测HO·的生成，以验证谷胱甘肽的催化作用。检查了诸如pH，摩尔比和不同气氛的操作变量，并进行了循环降解实验以探索催化剂的稳定性。电喷雾电离质谱法（ESI-MS）用于确定不同形式的谷胱甘肽的转化，以探索其催化机理。更重要的是，发现其他硫醇化合物也可以通过硫醇化合物及其氧化形式的循环促进芬顿降解。总之，它是基于–HS / –SS–S–循环的带有羟基自由基的助催化剂，以前尚未见报道。