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An extra-chelator-free fenton process assisted by electrocatalytic-induced in-situ pollutant carboxylation for target refractory organic efficient treatment in chemical-industrial wastewater.
- Source :
-
Environmental Research . Sep2023, Vol. 232, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- For traditional Fenton processes, the quenching behavior of radical contenders (e.g., most aliphatic hydrocarbons) on hydroxyl radicals (·OH) usually hinders the removal of target refractory pollutants (aromatic/heterocyclic hydrocarbons) in chemical industrial wastewater, leading to excess energy consumption. Herein, we proposed an electrocatalytic-assisted chelation-Fenton (EACF) process, with no extra-chelator addition, to significantly enhance target refractory pollutant (pyrazole as a representative) removal under high ·OH contender (glyoxal) levels. Experiments and theoretical calculations proved that superoxide radical ( · O 2 −) and anodic direct electron transfer (DET) effectively converted the strong ·OH-quenching substance (glyoxal) to a weak radical competitor (oxalate) during the electrocatalytic oxidation process, promoting Fe2+ chelation and therefore increasing radical utilization for pyrazole degradation (reached maximum of ∼43-fold value upon traditional Fenton), which appeared more obviously in neutral/alkaline Fenton conditions. For actual pharmaceutical tailwater treatment, the EACF achieved 2-folds higher oriented-oxidation capability and ∼78% lower operation cost per pyrazole removal than the traditional Fenton process, demonstrating promising potential for future practical applications. [Display omitted] • The ·OH utilization for target pollutant removal was greatly enhanced by EACF. • Extra-chelator-free Fenton was realized by in-situ pollutant-to-chelator conversion. • Mechanism of EO assisted Fenton was proposed based on DFT calculations. • High oriented oxidation ability and low energy input were found in EACF system. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00139351
- Volume :
- 232
- Database :
- Academic Search Index
- Journal :
- Environmental Research
- Publication Type :
- Academic Journal
- Accession number :
- 164854097
- Full Text :
- https://doi.org/10.1016/j.envres.2023.116243