Chromate removal as influenced by the structural changes of soil components upon carbonization at different temperatures. Academic Article uri icon

abstract

  • Surface fire could induce heat transferring into the soil, creating a carbonized environment, which may alter the chemical compositions of soil organic matters (SOM). In the study, a surface soil was carbonized at up to 600 C with limited air to simulate soils experiencing a surface fire, and Cr(VI) removal on the carbonized soils was investigated. NMR and FTIR analyses demonstrated a remarkable change of SOM structures at 300-400 C. TGA-MS spectra indicated that (e.g. C(2)H(4), CH(3)OH and C(3)H(8)) were the major components in the evolved gases from the pyrolyzed soil. A maximum amount of Cr(VI) removal (ca. 4 mg g(-1) soil) occurred for the 200 C-carbonized soils, attributed mainly to a significant increase of Cr(VI) reduction by 0.1 M KCl extractable organic carbon (EOC) with abundant carboxylic groups. Nonetheless, the formation of aromatic C upon carbonization of the soil at >400 C may be responsible for Cr(VI) reduction.

published proceedings

  • Environ Pollut

author list (cited authors)

  • Chen, K. Y., Liu, J. C., Chiang, P. N., Wang, S. L., Kuan, W. H., Tzou, Y. M., ... Wang, M. K.

citation count

  • 13

complete list of authors

  • Chen, KY||Liu, JC||Chiang, PN||Wang, SL||Kuan, WH||Tzou, YM||Deng, Y||Tseng, KJ||Chen, CC||Wang, MK

publication date

  • March 2012