Oxidation of aquatic pollutants by ferrous–oxalate complexes under dark aerobic conditions
SCIE
SCOPUS
- Title
- Oxidation of aquatic pollutants by ferrous–oxalate complexes under dark aerobic conditions
- Authors
- Jaesang Lee; Jungwon Kim; Choi, W
- Date Issued
- 2014-06-15
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- This study evaluates the ability of Fe-II-oxalate complexes for the generation of (OH)-O-center dot through oxygen reduction and the oxidative degradation of aquatic pollutants under dark aerobic conditions (i.e., with oxygen but without light). The degradation of 4-chlorophenol (4-CP) was rapid in the mixture of Fe2+ and oxalate prepared using ultrapure water, but was absent without either Fe2+ or oxalate. The formation of Fe-II-oxalate complexes enables two-electron reduction of oxygen to generate H2O2 and subsequent production of (OH)-O-center dot. The significant inhibition of 4-CP degradation in the presence of H2O2 and (OH)-O-center dot scavenger confirms such mechanisms. The degradation experiments with varying [Fe2+], [oxalate], and initial pH demonstrated that the degradation rate depends on [Fe-II(Ox)(2)(2-)], but the degree of degradation is primarily determined by [Fe-II(Ox)(2)(2-)] + [Fe-II(Ox)(0)]. Efficient degradation of diverse aquatic pollutants, especially phenolic pollutants, was observed in the Fe-II-oxalate complexes system, wherein the oxidation efficacy was primarily correlated with the reaction rate constant between pollutant and (OH)-O-center dot. The effect of various organic ligands (oxalate, citrate, EDTA, malonate, and acetate) on the degradation kinetics of 4-CP was investigated. The highest efficiency of oxalate for the oxidative degradation is attributed to its high capability to enhance the reducing power and low reactivity with (OH)-O-center dot. (C) 2014 Elsevier B.V. All rights reserved.
- Keywords
- Ferrous-oxalate complexes; Dark aerobic reaction; OH radicals; Oxidation; Water treatment; HYDROXYL RADICAL REACTIONS; DISSOLVED ORGANIC-MATTER; AQUEOUS-SOLUTION; RATE CONSTANTS; ABIOTIC REDUCTION; OXALIC-ACID; FE(III)-CITRATE COMPLEX; FE(II) OXIDATION; FENTONS REAGENT; BROWN-ROT
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14483
- DOI
- 10.1016/J.JHAZMAT.2014.03.056
- ISSN
- 0304-3894
- Article Type
- Article
- Citation
- JOURNAL OF HAZARDOUS MATERIALS, vol. 274, page. 79 - 86, 2014-06-15
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