This experiment investigates the adsorption characteristic of heavy metals by humic substances of Forest soil in a packed bed column. Forest humic substances contain various components such as carboxyl group, phenol group which provide active sites fo...
This experiment investigates the adsorption characteristic of heavy metals by humic substances of Forest soil in a packed bed column. Forest humic substances contain various components such as carboxyl group, phenol group which provide active sites for heavy metal binding. Humic substances of high cation exchange capacity have been utilized for removing metal ions.
The analysis of chemical structure of humic substances was investigaed by FT-IR and CP/MAS Carbon-13 NMR Spectrometer at last year. Adsorption experiments of heavy metal cation by humic substances was conducted to the optimum adsorption condition. The adsorption isotherms for Cu, Zn, Cd, Cr conformed to Langmuir's equation. In the packed bed column, the adsorption ratios of Cu, Zn, Cd, Cr on the humic substances were more than 90%. There were no significant differences between the adsorption ratio and the species of humic substances. With increasing retention time, the removal efficiency of heavy metal ions were not changed greatly. The adsorption ratio of the heavy metal ions were considerably greater for the packed bed reactor than for the stirred reactor. The stirred and column methods give similar result for the adsorption characteristics of heavy metal ion in humic substances.