Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 33, Pages 14591-14594Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp9051837
Keywords
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Funding
- U.S. Environmental Protection Agency [R829625, GR832225]
- National Science Foundation [0521439, 0616644]
- Pennsylvania Infrastructure Technology Alliance (PITA)
- EPA [909038, R829625, 1099896, GR832225] Funding Source: Federal RePORTER
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0521439] Funding Source: National Science Foundation
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Increasing evidence suggests that nanoscale zerovalent iron (nZVI) is effective for the removal of arsenic front contaminated water, but the immobilization mechanism is unclear, In particular, the existence of As(0) oil the nanoparticle surface has been proposed but not substantiated in prior Studies. By using high-resolution X-ray photoelectron spectroscopy (HR-XPS), we report clear evidence of As(0) species oil nZVI surfaces after reactions with As(III) of As(V) species in solutions. These results prove that reduction to elemental arsenic by nZVI is an important mechanism for arsenic immobilization. Furthermore. reactions of nZVI with As(III) generated As(0), As(III), and As(V) oil the nanoparticle surfaces, indicating both reduction and oxidation of As(III) take place with nZVI treatment. The dual redox functions exhibited by nZVI are enabled by its, core-shell Structure containing a metallic core with a highly reducing characteristic and a thin amorphous iron (oxy)hydroxide layer promoting As(III) coordination and oxidation. Results demonstrated here shed light Oil the underlying mechanisms of arsenic reactions with nZVI and Suggest nZVI as a potential multifaceted agent for arsenic remediation.
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