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Surface structure regulation of sulfidated zero-valent iron by H2O2 for efficient pH self-regulation and proton cycle to boost heterogeneous Fenton-like reaction for pollutant control.
- Source :
-
Applied Catalysis B: Environmental . May2024, Vol. 345, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Sulfidated zero-valent iron (SZVI) has been widely used in controlling organic pollutants. However, the significant decrease in catalytic activity of SZVI-based Fenton-like systems under neutral and alkaline conditions remains a large problem. Herein, it was found that surface structure regulation of SZVI with H 2 O 2 (HT-SZVI) greatly enhanced its reactivity and efficiently activated H 2 O 2 to oxidize various organics in a wide pH range. The HT-SZVI/H 2 O 2 system exhibited a pH self-regulation capability that stabilized the eventual solution pH at ∼3.5 at the initial pH of 3.0–9.0. The excellent oxidation performance was primarily attributed to surface-bound •OH produced from H 2 O 2 activation by surface Fe(II) sites on HT-SZVI. Additionally, dissolved Fe(II) converted from surface Fe(II) induced proton generation to self-regulate pH. Newly formed high proton-conductive FeS and Fe 3 O 4 shells accelerated the transfer of accumulated protons in solution to iron core to produce Fe(II), enabling efficient proton consumption-regeneration cycle and enhancing •OH production. [Display omitted] • H 2 O 2 pre-corrosion of SZVI greatly modify its structure and surface properties. • Fe(II) (aq) induced the proton production and self-constructed acidic environment. • Fe(II) (s) contributed to H 2 O 2 activation to continuously produce surface-bound •OH. • Newly formed high proton-conductive FeS and Fe 3 O 4 shells boosted the proton cycle. • A durable pH self-regulation effect was maintained in the oxidation process. [ABSTRACT FROM AUTHOR]
- Subjects :
- *IRON
*SURFACE structure
*IRON oxides
*PROTONS
*POLLUTANTS
Subjects
Details
- Language :
- English
- ISSN :
- 09263373
- Volume :
- 345
- Database :
- Academic Search Index
- Journal :
- Applied Catalysis B: Environmental
- Publication Type :
- Academic Journal
- Accession number :
- 175026449
- Full Text :
- https://doi.org/10.1016/j.apcatb.2023.123667