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Characterization of insolubilized humic acid and its sorption behaviors

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Environmental Geology

Abstract

Insolubilized humic acid (IHA) was prepared in the laboratory by heating approach. Through the comparison between the endothermic peaks, optimal heating temperature was determined to be 330°C. The modified IHA then was characterized by TG-DTA, SEM, FTIR, element analysis, and nitrogen adsorption–desorption isotherms. The removal efficiency of p-nitrophenol from the aqueous solution by adsorption onto solid IHA surfaces was shown to be a function of pH, reaction temperature, and p-nitrophenol concentration. Adsorption equilibrium data satisfactorily fitted the Langmuir adsorption isotherm. Under a certain concentration range, the removal rate of p-nitrophenol at pH 3.5 could reach 24, 29, and 35 mg/g at a temperature of 25, 35, and 45±0.1°C. The results suggest that IHA could play a role as a potential efficient absorbent to remove organic contaminants, e.g., utilized to purify water contaminated by organic compounds.

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Acknowledgments

The authors would like to express the sincere gratitude to the Natural Science Foundation of Gansu Province in People’s Republic China for offering research fund with Project No. 3ZS041-A25–027. We also thank the Educational Bureau of Gansu Province for Project No. 0501-07.

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Correspondence to Hui Chen.

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Chen, H., Berndtsson, R., Ma, M. et al. Characterization of insolubilized humic acid and its sorption behaviors. Environ Geol 57, 1847–1853 (2009). https://doi.org/10.1007/s00254-008-1472-0

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  • DOI: https://doi.org/10.1007/s00254-008-1472-0

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