TANG Jiaxi, LI Jingyang, HE Miaomiao, LI Rrejie, LIU Ya, YING Bo, LI Yang. Adsorption performance of corn cob biochar for acetochlor and atrazine in riparian soil[J]. Chinese Journal of Environmental Engineering, 2018, 12(12): 3440-3447. doi: 10.12030/j.cjee.201805065
Citation:
TANG Jiaxi, LI Jingyang, HE Miaomiao, LI Rrejie, LIU Ya, YING Bo, LI Yang. Adsorption performance of corn cob biochar for acetochlor and atrazine in riparian soil[J]. Chinese Journal of Environmental Engineering, 2018, 12(12): 3440-3447. doi: 10.12030/j.cjee.201805065
Abstract:
In order to alleviate the pesticides pollution in riparian soil, and further prevent and control agricultural non-point source pollution, this study mainly focused on the adsorption behavior and mechanism of acetochlor and atrazine in riparian soil on a type of biochar derived from corn cob. Results show that the adsorption capacity of the riparian soil was remarkably enhanced by biochar addition. The adsorption thermodynamic process fitted well into both Freundlich and Langmuir models. In comparison with the control riparian soil, the maximum adsorption capacity of acetochlor on the biochar-amended soil increased from 13.28 to 769.23 μg·g-1 at 1.0% weight biochar addition, and 0.3% weight biochar addition could cause the maximum adsorption capacity of atrazine to increase from 70.92 to 333.33μg·g-1. The fitting results of the adsorption kinetics of acetochlor and atrazine onto biochar-amended soil by the pseudo-second order kinetic model was better than the pseudo-first order kinetic one. Both the adsorption capacity and rate are proportional to the addition amount of biochar in the soil. Corncob biochar can be used as a remediation agent for riparian soil so as to reduce the migration of acetochlor and atrazine.
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Abstract: In order to alleviate the pesticides pollution in riparian soil, and further prevent and control agricultural non-point source pollution, this study mainly focused on the adsorption behavior and mechanism of acetochlor and atrazine in riparian soil on a type of biochar derived from corn cob. Results show that the adsorption capacity of the riparian soil was remarkably enhanced by biochar addition. The adsorption thermodynamic process fitted well into both Freundlich and Langmuir models. In comparison with the control riparian soil, the maximum adsorption capacity of acetochlor on the biochar-amended soil increased from 13.28 to 769.23 μg·g-1 at 1.0% weight biochar addition, and 0.3% weight biochar addition could cause the maximum adsorption capacity of atrazine to increase from 70.92 to 333.33μg·g-1. The fitting results of the adsorption kinetics of acetochlor and atrazine onto biochar-amended soil by the pseudo-second order kinetic model was better than the pseudo-first order kinetic one. Both the adsorption capacity and rate are proportional to the addition amount of biochar in the soil. Corncob biochar can be used as a remediation agent for riparian soil so as to reduce the migration of acetochlor and atrazine.
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