Adsorption Isotherm and Kinetics of Humic Acid in Albic Soil
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    Abstract:

    Albic soil is one of the main farmland soils in the eastern part of Jilin Province and Heilongjiang Province. Studying the adsorption of humic acid by albic soil can provide a theoretical basis for exploring the carbon sequestration potential of albic soil. Batch balance method was applied to analyze the adsorption kinetics and isothermal adsorption characteristics of albic soil with different organic carbon content and its components (including de-organic soil, silt, clay) to humic acid. The results showed that with the prolongation of adsorption time, the amounts of humic acid adsorbed by albic soil and its components increased gradually; the whole adsorption kinetics process could be divided into fast reaction (0~30 min) and slow reaction (30~480 min) stage. At the reaction stage, the fitting effect of the pseudo second-order kinetic equation was better than that of Elovich, double constant and pseudo first-order kinetic equation. The amount of humic acid adsorbed by albic soil and its components increased with the increasing of the initial concentration of humic acid, and the fitting effect of the Langmuir equation was usually better than that of the Freundlich equation and the Temkin equation. With the increasing of organic carbon content of albic soil, the maximum adsorption amounts for humic acid were 26.9, 24.1 and 15.6 mg/g, respectively. For the different components of the albic soil, the maximum adsorption amount followed the order of clay > de-organic soil > powder, and the adsorption amount of clay was 2.15 to 3.88 times that of the original soil, 1.61 to 2.21 times that of the deorganic soil, 7.90 to 8.65 times that of the powder soil. The above results showed that the albic soil with low organic carbon content had stronger adsorption capacity to humic acid, and the albic soil with high clay content had greater adsorption potential to humic acid.

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History
  • Received:September 23,2018
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  • Online: April 17,2019
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