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- Title
Oxalate Enhanced Organic Pollutant Removal with a UV/Fe0 System: Performance, Mechanisms, and Role of Oxalate.
- Authors
Pan, Yuwei; Bu, Zhuoyu; Li, Xiang; Han, Jiangang
- Abstract
This study presented the efficient removal of tartrazine, a typical biorefractory dye, in a heterogeneous photochemical Fenton-like system adopting Fe0 and oxalate (Ox) (UV/Fe0/Ox). Only 47.4% tartrazine could be removed within 60 min with a UV/Fe0 system. The addition of Ox could significantly enhance the removal of tartrazine to 72.4% within only 20 min with the UV/Fe0/Ox system. The effects of various factors, such as the Fe0 dose (0–0.8 g/L), Ox dose (0–2 mM), initial pH (2–6), and initial tartrazine concentration (2–30 mg/L), on the removal of tartrazine were examined. Scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and Mossbauer spectroscopy were conducted to explore the mechanism by which oxalate enhances the performance of the UV/Fe0 system. Ox could inhibit the formation of iron (hydro)xides on the Fe0 surface, thus guaranteeing the reactivity of Fe0 during the reaction. Compared with Fe2O3, FeS, and Fe3O4, Fe0 was a good heterogeneous iron catalyst for the photolysis of tartrazine with the Ox system. Compared with H3PO4, nitrilotriacetic acid, and ethylenediaminetetraacetic acid, Ox was also a good photolysis chelating agent. The UV/Fe0/Ox system could also maintain fast tartrazine removal after five consecutive runs without the addition of Fe0, indicating the good stability of Fe0.
- Subjects
TARTRAZINE; POLLUTANTS; ETHYLENEDIAMINETETRAACETIC acid; MOSSBAUER spectroscopy; IRON catalysts; NITRILOTRIACETIC acid; CHELATING agents
- Publication
Water, Air & Soil Pollution, 2021, Vol 232, Issue 3, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-021-05063-w