Stabilisation of nanoscale zero-valent iron with biochar for enhanced transport and in-situ remediation of hexavalent chromium in soil

Huijie SU, Zhanqiang FANG, Po Keung Eric TSANG, Jianzhang FANG, Dongye ZHAO

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Abstract

In this study, a biochar-supported nanoscale zero-valent iron (nZVI@BC) material was used for in situ remediation of hexavalent chromium-contaminated soil. Sedimentation tests and column experiments were used to compare the stability and mobility of nZVI@BC and bare-nZVI. The immobilisation efficiency of chromium, toxic effect of chromium and the content of iron were assessed through leaching tests and pot experiments. Sedimentation tests and transport experiments indicated that nZVI@BC with nZVI to BC mass ratio of 1:1 exhibited better stability and mobility than that of bare-nZVI. The immobilisation efficiency of Cr(VI) and Crtotal was 100% and 92.9%, respectively, when the soil was treated with 8 g/kg of nZVI@BC for 15 days. Moreover, such remediation effectively reduced the leachability of Fe caused by bare-nZVI. In addition, pot experiments showed that such remediation reduced the phytotoxicity of Cr and the leachable Fe and was favourable for plant growth. Copyright © 2016 Elsevier Ltd.
Original languageEnglish
Pages (from-to)94-100
JournalEnvironmental Pollution
Volume214
Early online dateApr 2016
DOIs
Publication statusPublished - Jul 2016

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Citation

Su, H., Fang, Z., Tsang, P. E., Fang, J., & Zhao, D. (2016). Stabilisation of nanoscale zero-valent iron with biochar for enhanced transport and in-situ remediation of hexavalent chromium in soil. Environmental Pollution, 214, 94-100.

Keywords

  • Cr(VI)-contaminated soil
  • nZVI@BC
  • Stability
  • Mobility
  • Phytotoxicity