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Effect of various oxidants in a photocatalysis/filtration system for the treatment of contaminants

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Abstract

This study was conducted to investigate the effect of a photocatalysis/oxidant system for the treatment of humic acid and hazardous heavy metals in aqueous solutions. Hydrogen peroxide, ozone, and potassium peroxodisulfate were tested as oxidants. The effect of oxidant concentration was conducted with a pH of 7, a UV intensity of 64 W, and a TiO2 dosage of 0.3 g L−1. The oxidant addition in the UV/TiO2 system enhanced the degradation efficiency of humic acid and hazardous heavy metals compared to no addition of an oxidant. The addition of oxidants over the amounts of H2O2 50 mg L−1, O3 20 g m−3, and K2S2O8 50 mg L−1 inhibits the system efficiency. The negative effect of higher oxidant concentrations likely results from OH radical quenching caused by the excess oxidant. Therefore, the optimal dosages of oxidants such as a hydrogen peroxide, ozone, and potassium peroxodisulfate were found to be 50 mg L−1, 20 g m−3, and 50 mg L−1, respectively. The degradation efficiency of UV/TiO2/oxidant systems for the removal of humic acid and hazardous heavy metals was much greater in the UV/TiO2/H2O2 system using H2O2 as an oxidant.

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Acknowledgment

This research was supported by the Regional Technology Innovation Program (grant no. RTI05-01-02) of the Ministry of Commerce, Industry and Energy (MOCIE).

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Authors and Affiliations

  1. Department of Civil Engineering, Kangnung National University, Gangneung Daehangno 120, Gangneung, Gangwon-do, 210-702, Korea

    Jong-Tae Jung & Jong-Oh Kim

  2. KIST Gangneung Institute, Gangneung Techno Valley, 290 Daejeon-dong, Gangneung, Gangwon-do, 210-340, Korea

    Jae-Young Choi

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  1. Jong-Tae Jung
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  2. Jong-Oh Kim
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  3. Jae-Young Choi
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Correspondence to Jong-Oh Kim.

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Jung, JT., Kim, JO. & Choi, JY. Effect of various oxidants in a photocatalysis/filtration system for the treatment of contaminants. Res Chem Intermed 35, 243–248 (2009). https://doi.org/10.1007/s11164-009-0034-8

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  • DOI: https://doi.org/10.1007/s11164-009-0034-8

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