Your browser doesn't support javascript.
loading
Key Role of Sulfur in Sulfidated Zerovalent Iron During Persulfate Activation for the Dynamic Equilibrium of Oxidative Radicals including SO4•- and •OH.
Gao, Xuyun; Wang, Xiang; Zhuang, Zihan; Tian, Xike; Nie, Yulun.
Afiliación
  • Gao X; Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China.
  • Wang X; Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China.
  • Zhuang Z; Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China.
  • Tian X; Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, PR China.
  • Nie Y; Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, PR China. Electronic address: ylnie@cug.edu.cn.
Environ Res ; : 119957, 2024 Sep 20.
Article en En | MEDLINE | ID: mdl-39307229
ABSTRACT
Surface sulfidation has been widely investigated to effectively enhance the utilization and selectivity of iron electrons for enhanced pollutant reduction. However, there is relatively less knowledge on whether sulfidation facilitates the catalytic oxidation process and the mechanism of enhancement. Therefore, in this study, the role of surface sulfidation in modulating the oxidant decomposition pathway and reactive oxygen species generation was investigated with the sulfidated zerovalent iron (S-ZVI) activated persulfate (PS) system. The results revealed that sulfur on the surface of S-ZVI not only facilitates PS activation to generate more SO4•-, but also acts as an essential in the dynamic equilibrium between SO4•- and •OH. Specifically, the S-ZVI surface sulfide first forms sulfur monomers during catalysis, which promotes electron transfer to accelerate Fe3+ to Fe2+ cycling, prompting the generation of more SO4•- also generates SO32-. Then, SO32- is further reacted with •OH to generate the [O--O-SO3-] intermediate of SO4•-, which leads to a dynamic equilibrium of SO4•- and •OH, mitigating the further conversion of SO4•- to •OH. These findings unveiled the dynamic variation of sulfur on the surface of S-ZVI during PS activation, elevating new insights for the sulfate radical-based efficient degradation.
Palabras clave
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Environ Res Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Environ Res Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos