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Critical Functions of Soil Components for In Situ Persulfate Oxidation of Sulfamethoxazole: Inherent Fe(II) Minerals-Coordinated Nonradical Pathway.
Liang, Jun; Duan, Xiaoguang; Xu, Xiaoyun; Zhang, Zehong; Zhang, Jingyi; Zhao, Ling; Qiu, Hao; Cao, Xinde.
Afiliação
  • Liang J; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Duan X; School of Chemical Engineering, The University of Adelaide, Adelaide, SA5005, Australia.
  • Xu X; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Zhang Z; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Zhang J; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Zhao L; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Qiu H; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Cao X; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Environ Sci Technol ; 58(1): 915-924, 2024 Jan 09.
Article em En | MEDLINE | ID: mdl-38088029
Naturally occurring iron (Fe) minerals have been proved to activate persulfate (PS) to generate reactive species, but the role of soil-inherent Fe minerals in activating PS as well as the underlying mechanisms remains poorly understood. Here, we investigated sulfamethoxazole (SMX) degradation by PS in two Fe-rich soils and one Fe-poor soil. Unlike with the radical-dominant oxidation processes in Fe-poor soil, PS was effectively activated through nonradical pathways (i.e., surface electron-transfer) in Fe-rich soils, accounting for 68.4%-85.5% of SMX degradation. The nonradical mechanism was evidenced by multiple methods, including electrochemical, in situ Raman, and competition kinetics tests. Inherent Fe-based minerals, especially those containing Fe(II) were the crucial activators of PS in Fe-rich soils. Compared to Fe(III) minerals, Fe(II) minerals (e.g., ilmenite) were more liable to form Fe(II) mineral-PS* complexes to initiate the nonradical pathways, oxidizing adjacent SMX via electron transfer. Furthermore, mineral structural Fe(II) was the dominant component to coordinate such a direct oxidation process. After PS oxidation, low-crystalline Fe minerals in soils were transformed into high-crystalline Fe phases. Collectively, our study shows that soil-inherent Fe minerals can effectively activate PS in Fe-rich soils, so the addition of exogenous iron might not be required for PS-based in situ chemical oxidation. Outcomes also provide new insights into the activation mechanisms when persulfate is used for the remediation of contaminated soils.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Solo / Sulfametoxazol Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Solo / Sulfametoxazol Idioma: En Ano de publicação: 2024 Tipo de documento: Article