Characterization of insolubilized humic acid and its sorption behaviors |
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| Authors: | Hui Chen Ronny Berndtsson Mingguang Ma Kun Zhu |
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| Affiliation: | (1) Chemistry and Chemical Engineering College, Northwest Normal University, Lanzhou, Gansu, 730070, People’s Republic of China;(2) Department of Water Resources Engineering, Lund University, S-22100 Lund, Sweden;(3) School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, 730070, People’s Republic of China |
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| 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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| Keywords: | Soil contamination Insolubilized humic acid Modification Adsorption p-Nitrophenol Isothermal curve |
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