Chromate reduction on humic acid derived from a peat soil - Exploration of the activated sites on HAs for chromate removal

S. W. Huang, P. N. Chiang, J. C. Liu, J. T. Hung, W. H. Kuan, Y. M. Tzou, S. L. Wang, J. H. Huang, Chung-Chi Chen, M. K. Wang, R. H. Loeppert

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Humic substances are a major component of soil organic matter that influence the behavior and fate of heavy metals such as Cr(VI), a toxic and carcinogenic element. In the study, a repetitive extraction technique was used to fractionate humic acids (HAs) from a peat soil into three fractions (denoted as F1, F2, and F3), and the relative importance of O-containing aromatic and aliphatic domains in humic substances for scavenging Cr(VI) was addressed at pH 1. Spectroscopic analyses indicated that the concentrations of aromatic C and O-containing functional groups decreased with a progressive extraction as follows: F1>F2>F3. Cr(VI) removal by HA proceeded slowly, but it was enhanced when light was applied due to the production of efficient reductants, such as cal and H2O2, for Cr(VI). Higher aromatic- and O-containing F1 fraction exhibited a greater efficiency for Cr(VI) reduction (with a removal rate of ca. 2.89mmolg-1 HA under illumination for 3h). 13C NMR and FTIR spectra further demonstrated that the carboxyl groups were primarily responsible for Cr(VI) reduction. This study implied the mobility and fate of Cr(VI) would be greatly inhibited in the environments containing such organic groups.

Original languageEnglish
Pages (from-to)587-594
Number of pages8
JournalChemosphere
Volume87
Issue number6
DOIs
Publication statusPublished - 2012 May 1

Fingerprint

Chromates
Humic Substances
chromate
Peat
peat soil
humic acid
Soil
humic substance
Soils
functional group
nuclear magnetic resonance
soil organic matter
heavy metal
Scavenging
Biological materials
Functional groups
Heavy metals
Poisons
Reducing Agents
Lighting

Keywords

  • Aromatic groups
  • Cr(VI)
  • Humic acid
  • Oxygen-containing c
  • Reduction

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Huang, S. W., Chiang, P. N., Liu, J. C., Hung, J. T., Kuan, W. H., Tzou, Y. M., ... Loeppert, R. H. (2012). Chromate reduction on humic acid derived from a peat soil - Exploration of the activated sites on HAs for chromate removal. Chemosphere, 87(6), 587-594. https://doi.org/10.1016/j.chemosphere.2012.01.010

Chromate reduction on humic acid derived from a peat soil - Exploration of the activated sites on HAs for chromate removal. / Huang, S. W.; Chiang, P. N.; Liu, J. C.; Hung, J. T.; Kuan, W. H.; Tzou, Y. M.; Wang, S. L.; Huang, J. H.; Chen, Chung-Chi; Wang, M. K.; Loeppert, R. H.

In: Chemosphere, Vol. 87, No. 6, 01.05.2012, p. 587-594.

Research output: Contribution to journalArticle

Huang, SW, Chiang, PN, Liu, JC, Hung, JT, Kuan, WH, Tzou, YM, Wang, SL, Huang, JH, Chen, C-C, Wang, MK & Loeppert, RH 2012, 'Chromate reduction on humic acid derived from a peat soil - Exploration of the activated sites on HAs for chromate removal', Chemosphere, vol. 87, no. 6, pp. 587-594. https://doi.org/10.1016/j.chemosphere.2012.01.010
Huang, S. W. ; Chiang, P. N. ; Liu, J. C. ; Hung, J. T. ; Kuan, W. H. ; Tzou, Y. M. ; Wang, S. L. ; Huang, J. H. ; Chen, Chung-Chi ; Wang, M. K. ; Loeppert, R. H. / Chromate reduction on humic acid derived from a peat soil - Exploration of the activated sites on HAs for chromate removal. In: Chemosphere. 2012 ; Vol. 87, No. 6. pp. 587-594.
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