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TiO2 photocatalytic degradation of 4-chlorobiphenyl as affected by solvents and surfactants

  • SOILS, SEC 2 • GLOBAL CHANGE, ENVIRON RISK ASSESS, SUSTAINABLE LAND USE • RESEARCH ARTICLE
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Abstract

Purpose

TiO2 photocatalytic degradation of 4-chlorobiphenyl (PCB3) in aqueous solution under UV irradiation was investigated as affected by different environmental factors, including initial PCB3 concentration, TiO2 content, UV intensity, H2O2 concentration, cosolvents, and surfactants.

Materials and methods

The solution of PCB3 with TiO2 was irradiated by medium mercury lamp. The concentration of PCB3 and intermediates was analyzed by GC-μECD and GC–MS. The values of point charge and bond length were also calculated with ChemOffice 2004 (Mopac unit).

Results and discussion

Photocatalysis was very effective for PCB3 removal, and the degradation kinetics were fitted with a pseudo-first order reaction model. PCB3 was efficiently degraded in the presence of acetone and acetonitrile, but was completely inhibited with other examined cosolvents. HPCD and Tween80 also inhibited the degradation rate of PCB3, while Brij35 slightly decreased the degradation rate of PCB3 at first, and then increased. The reaction mechanism occurred principally by hydroxyl radicals involving the participation of holes and superoxide anion oxidation. A possible photocatalytic degradation pathway of PCB3 was proposed based on the identified reaction intermediates as well as computer simulation.

Conclusions

The photocatalytic approach could be successfully applied to degrade PCB3, and cosolvents and surfactants significantly influenced its degradation kinetics.

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Acknowledgements

This work was supported by the Public Welfare Project of Ministry of Environmental Protection of Peoples’ Republic of China (No. 201009009) and the National Basic Research and Development Program (No. 2007CB936604).

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Authors and Affiliations

  1. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, People’s Republic of China

    Xiangdong Zhu, Dongmei Zhou, Long Cang & Yujun Wang

  2. Graduate School of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

    Xiangdong Zhu

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  1. Xiangdong Zhu
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  2. Dongmei Zhou
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  3. Long Cang
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  4. Yujun Wang
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Correspondence to Dongmei Zhou.

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Responsible editor: Huijun Zhao

Electronic supplementary material

Kinetic parameters for photocatalytic degradation of PCB3 with initial concentrations of PCB3 and Brij35/Tween80 (Table S1), the degradation intermediates identified from GC–EI–MS (Tables S2 and S3), charges of atoms and bond lengths of the PCB3 based on the AM1 level (Table S4), and the structure of 4-chlorobiphenyl (Fig. S1) as well as the GC–MS–EI spectrum of degradation products of PCB3 (Fig. S2) are included

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Zhu, X., Zhou, D., Cang, L. et al. TiO2 photocatalytic degradation of 4-chlorobiphenyl as affected by solvents and surfactants. J Soils Sediments 12, 376–385 (2012). https://doi.org/10.1007/s11368-011-0464-y

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  • DOI: https://doi.org/10.1007/s11368-011-0464-y

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