Department of Orthopaedics, Guizhou Provincial People's Hospital, Guiyang 550002, Guizhou, China.
School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China.
Chemosphere. 2022 Nov;307(Pt 4):136198. doi: 10.1016/j.chemosphere.2022.136198. Epub 2022 Aug 26.
Seeking effective methods to degrade organic pollutants has always been a hot research field. In this work, MoS/FeO catalyst was synthesized by hydrothermal method with MoS as carrier to construct an advanced oxidation system of electrochemical enhanced MoS/FeO-activated peroxymonosulfate (E/MoS/FeO/PMS). The materials were characterized by X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. The degradation efficiency of sulfamerazine (SM1) by E/MoS/FeO/PMS system was investigated and reaction mechanism was explored. The results showed that the removal rates of SM1 within 30 min were 31%, 20% and 89% with FeO, MoS and MoS/FeO as catalysts, respectively. The characterization results revealed that Fe(III) on the surface of FeO was reduced to Fe(II) and Mo(IV) was oxidized to Mo(VI) in the presence of MoS. The synergistic effect between FeO and MoS enhanced the PMS decomposition and improved the SM1 removal efficiency. Free radical quenching experiments showed that SO⋅, ·OH, O· and O were all involved in the degradation of SM1, and the effect of O was more significant than other active substances. Low concentrations of Cl and humic acid (HA) had no significant inhibitory effect on the degradation of SM1, while HCO had a significant inhibitory effect on the E/MoS/FeO/PMS system. In addition, catalyst cycling experiments showed that MoS/FeO maintained good stability before and after the catalytic reaction process.
寻求有效降解有机污染物的方法一直是一个热门的研究领域。在这项工作中，采用水热法合成了 MoS 负载的 MoS/FeO 催化剂，构建了电化学增强 MoS/FeO-过一硫酸盐（E/MoS/FeO-PMS）高级氧化体系。采用 X 射线衍射、透射电子显微镜和 X 射线光电子能谱对材料进行了表征。考察了 E/MoS/FeO/PMS 体系降解磺胺甲恶唑（SM1）的效率，并探讨了反应机理。结果表明，在 30 min 内，以 FeO、MoS 和 MoS/FeO 为催化剂时，SM1 的去除率分别为 31%、20%和 89%。表征结果表明，在 MoS 的存在下，FeO 表面的 Fe(III)被还原为 Fe(II)，Mo(IV)被氧化为 Mo(VI)。FeO 和 MoS 之间的协同作用增强了 PMS 的分解，提高了 SM1 的去除效率。自由基猝灭实验表明，SO⋅、·OH、O·和 O 都参与了 SM1 的降解，其中 O 的作用比其他活性物质更为显著。低浓度的 Cl 和腐殖酸（HA）对 SM1 的降解没有明显的抑制作用，而 HCO 对 E/MoS/FeO/PMS 体系有明显的抑制作用。此外，催化剂循环实验表明，MoS/FeO 在催化反应前后保持良好的稳定性。
