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Remediation of polychlorinated biphenyl-contaminated soil by soil washing and subsequent TiO2 photocatalytic degradation

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

Purpose

An efficient method was developed for treating polychlorinated biphenyl (PCB)-contaminated soil by soil washing and subsequent TiO2 photocatalytic degradation, and the photocatalytic degradation mechanism of PCBs was explored.

Materials and methods

Hydroxypropyl-β-cyclodextrin (HPΒCD) and polyoxyethylene lauryl ether (Brij35) were used to extract PCBs from contaminated soil at first, and then the degradation of PCBs in the soil extracts was performed by TiO2 photocatalysis under UV irradiation.

Results and discussion

Washing conditions including washing time, the concentration of HPΒCD/Brij35, and the ratio of soil mass to solution volume for extracting 2,4,4′-trichlorobiphenyl (PCB28) from a PCB28-spiked soil were investigated at first. The results indicated that both HPΒCD and Brij35 exhibited good performance. The intermediates of photocatalytic degradation of PCB28 were from its dechlorination and hydroxylation in the HPCD and aqueous solutions, respectively. A field PCB-contaminated soil from e-waste recycling sites was treated by this method. The results showed that the extracting percentage was significantly affected by the chlorination degree of PCBs, and HPΒCD slowed down the photocatalytic degradation efficiency of overall PCBs.

Conclusions

Soil washing and subsequent TiO2 photocatalytic degradation was successfully applied for treating PCB-contaminated soil, and HPΒCD strongly altered the pathways of the photocatalytic degradation of PCBs.

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Acknowledgments

This work was financially 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). We also thank Ms. Hong Cheng from the Institute of Soil Science, Chinese Academy of Sciences for his assistance in identifying the intermediates of PCB28 using GC–MS.

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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, Yujun Wang, Long Cang, Guodong Fang & Jianxin Fan

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

    Xiangdong Zhu, Guodong Fang & Jianxin Fan

Authors
  1. Xiangdong Zhu
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  2. Dongmei Zhou
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  3. Yujun Wang
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  4. Long Cang
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  5. Guodong Fang
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  6. Jianxin Fan
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Corresponding author

Correspondence to Dongmei Zhou.

Additional information

Responsible editor: Huijun Zhao

Electronic supplementary material

The charges of atoms and bond lengths of the PCB28 (Table S1) are included.

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Zhu, X., Zhou, D., Wang, Y. et al. Remediation of polychlorinated biphenyl-contaminated soil by soil washing and subsequent TiO2 photocatalytic degradation. J Soils Sediments 12, 1371–1379 (2012). https://doi.org/10.1007/s11368-012-0556-3

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  • DOI: https://doi.org/10.1007/s11368-012-0556-3

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