College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, PR China.
Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.
J Hazard Mater. 2018 Jul 5;353:393-400. doi: 10.1016/j.jhazmat.2018.04.029. Epub 2018 Apr 18.
Heterogeneous Fenton-like system has been proved to be an promising alternative to Fenton system due to its easy separation. However, it's a challenge to design heterogeneous Fenton-like catalysts with high activity and great durability. Here, ternary solid solution FeZnS were prepared via hydrothermal synthesis as heterogeneous Fenton-like catalysts. The FeZnS sample exhibited state of the art activity for yielding OH by HO decomposition, and the ultrafast degradation of phenol was achieved in 4 min at initial acidic condition under room temperature. The phenol degradation rate constant of FeZnS was 99 and 70 times of ZnS and FeS, respectively. Further, we show that the unique structural configuration of iron atoms, the formation of FeS-pyrite with (200) plane, are responsible for the excellent activity. The intermediate products were identified by LC-MS and a possible pathway was accordingly proposed to elucidate the mechanism of phenol degradation by OH. Overall, this work provides an idea for the rational design of the relevant heterogeneous Fenton-like catalysts.
非均相类芬顿体系因其易于分离而被证明是替代芬顿体系的一种很有前途的方法。然而，设计具有高活性和高耐久性的非均相类芬顿催化剂仍然是一个挑战。本文通过水热合成制备了三元固溶体 FeZnS 作为非均相类芬顿催化剂。FeZnS 样品在 HO 分解生成 OH 方面表现出了卓越的活性，在初始酸性条件下，室温下仅需 4 分钟即可实现苯酚的超快降解。FeZnS 的苯酚降解速率常数分别是 ZnS 和 FeS 的 99 倍和 70 倍。此外，我们表明，铁原子的独特结构构型和（200）面的 FeS-黄铁矿的形成是其具有优异活性的原因。通过 LC-MS 鉴定了中间产物，并提出了一种可能的途径来阐明 OH 降解苯酚的机制。总的来说，这项工作为相关非均相类芬顿催化剂的合理设计提供了思路。
