The photo-Fenton reaction — an effective photochemical wastewater treatment process

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Abstract

A novel photochemical degradation method for organic contaminants, the photo-Fenton reaction, has been investigated. Irradiation of an aqueous solution of 4-chlorophenol (4-CP) with light of greater than 320 nm in the presence of H2O2 and Fe2+ accelerates the degradation rate of 4-CP and total organic carbon (TOC) significantly compared with the Fe2+H2O2 reaction in the dark. The effects of the initial 4-CP and H2O2 concentrations and the intensity of light irradiation on the degradation rates of TOC and H2O2 and the ratio of Fe2+ to Fe3+ are described. Results are compared with the dark Fenton reaction.

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    Citation Excerpt :

    In a typical AOP, reactive oxygen species such as hydroxyl radicals are generated with the assistance of catalysts and/or energies, which attack the hazardous organic compounds and decompose them into harmless ones [2]. Photo-Fenton reaction is one of the most widely investigated and applied AOPs, in which the hydroxyl radicals are generated from the hydrogen peroxide in the presence of iron (II/III) as the catalyst [3–5]. Compared with other photocatalytic reactions, the photo-Fenton reaction can proceed with low-cost catalysts under visible light.

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