Abstract

The degradation of ortho-chlorophenol using Fenton's reagent was studied by chemiluminescence (CL). Without a special CL reagent, a weak CL emission from the mixture of ferrous ion and hydrogen peroxide was observed at room temperature. The CL intensity was increased by the addition of ortho-chlorophenol into the mixed solution. When the temperature was raised to 65 degrees C, the CL intensity was enhanced strongly. The CL mechanisms for the system H2O2-Fe2+ with and without ortho-chlorophenol were studied by examining the CL spectrum, gas chromatography-mass spectrometry and electron spin resonance spectrum. The effects of various free radical scavengers, surfactants and fluorescence compounds on the CL intensity were also investigated. A self-catalytic oxidation mechanism was proposed. The results showed that singlet oxygen was the main emitter for the system H2O2-Fe2+. The strong CL from the system H2O2-Fe(2+)-ortho-chlorophenol was due to singlet oxygen and electronically excited quinone. The benzenediol-like intermediate product formed during the phenol oxidation process greatly promoted the Fenton's reaction and led to higher CL intensity. Chemiluninescence is a novel approach for the investigation of the oxidation of some organic pollutants by Fenton's reagent.

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Authors

Lin Z, Chen H, Zhou Y, Ogawa N, Lin JM

Institution

Beijing Key Laboratory of Microanalytical Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China. Linz08@mail.tsinghua.edu.cn

Source

Journal of environmental sciences (China) 24:3 2012 pg 550-7

MeSH

Catalysis
Chlorophenols
Electron Spin Resonance Spectroscopy
Environmental Pollutants
Hydrogen Peroxide
Iron
Luminescence
Molecular Structure
Spin Trapping

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22655372