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 language | English |
|---|---|
| Pages (from-to) | 94-100 |
| Journal | Environmental Pollution |
| Volume | 214 |
| Early online date | Apr 2016 |
| DOIs | |
| Publication status | Published - Jul 2016 |
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