Remediation of arsenic-contaminated paddy soil by iron-modified biochar

Chuan WU, MengQian CUI, ShengGuo XUE, Wai Chin LI, Liu HUANG, XingXing JIANG, ZiYan QIAN

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15 Citations (Scopus)

Abstract

Arsenic contamination in paddy soils has aroused global concern due to its threats to food security and human health. Biochar modified with different iron materials was prepared for arsenic (As) immobilization in contaminated soils. Soil incubation experiments were carried to investigate the effects of biochar modified with Fe-oxyhydroxy sulfate (Biochar-FeOS), FeCl3 (Biochar-FeCl3), and zero-valent iron (Biochar-Fe) on the pH, NaHCO3-extractable As concentrations, and the As fractions in soils. The scanning electron microscope and X-ray diffraction analysis demonstrated that iron was successfully loaded onto the surface or embedded into the pores of the biochar. Addition of Biochar-FeOS, Biochar-FeCl3, and Biochar-Fe had no significant effects on the soil pH but significantly decreased the contents of NaHCO3-extractable As in soils by 13.95–30.35%, 10.97–28.39%, and 17.98–35.18%, respectively. Biochar-FeOS, Biochar-FeCl3, and Biochar-Fe treatments decreased the concentrations of non-specifically sorbed and specifically sorbed As fractions in soils, and increased the amorphous and poorly crystalline, hydrated Fe, Al oxide-bound, and residual As fractions. Compared with the other iron-modified biochars, Biochar-FeOS showed the most effective immobilization and has the potential for the remediation of As-contaminated paddy soils. Copyright © 2018 Springer-Verlag GmbH Germany, part of Springer Nature.

Original languageEnglish
Pages (from-to)20792-20801
JournalEnvironmental Science and Pollution Research
Volume25
Issue number21
Early online dateMay 2018
DOIs
Publication statusPublished - Jul 2018

Citation

Wu, C., Cui, M., Xue, S., Li, W., Huang, L., Jiang, X., & Qian, Z. (2018). Remediation of arsenic-contaminated paddy soil by iron-modified biochar. Environmental Science and Pollution Research, 25(21), 20792–20801. doi: 10.1007/s11356-018-2268-8

Keywords

  • Arsenic
  • Paddy soil
  • Iron-modified biochar
  • As fractions
  • Soil remediation

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