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| Preferential adsorption mechanism of montmorillonite and hematite on aging biochar-derived dissolved organic matter |
| Received:August 04, 2024 |
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| KeyWord:biochar;mineral;adsorption;dissolved organic matter;aging |
| Author Name | Affiliation | E-mail | | NING Yongxing | College of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | | | ZHOU Jiahao | College of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | | | LIU Kai | Sugarcane Research Institute, Yunnan Academy of Agricultural Sciences, Honghe 661699, China | | | LIU Gaoyuan | Sugarcane Research Institute, Yunnan Academy of Agricultural Sciences, Honghe 661699, China | | | DUAN Xizhao | College of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | | | GUO Jiawen | Sugarcane Research Institute, Yunnan Academy of Agricultural Sciences, Honghe 661699, China | | | LI Fangfang | College of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | fangkust@163.com |
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| Abstract: |
| In order to study the preferential adsorption mechanism of minerals on biochar derived dissolved organic matter（BDOM/ABDOM）before and after aging, Aging biochar was prepared from corn straw biochar by 30 % hydrogen peroxide treatment., The program adsorption experiments were carried out using quartz sand（control group）, montmorillonite and hematite with BDOM/ABDOM. The results showed that due to the decrease of electrostatic repulsion between ABDOM and minerals, the aging of biochar increased the adsorption of BDOM by quartz sand, while the montmorillonite/hematite addition group was the opposite. The three minerals have the highest adsorption efficiency for BDOM for the first time. The order of formation efficiency of mineral-associated organic matter（MAOM）is montmorillonite> hematite>quartz sand. The formation efficiency of MAOM depended mainly on the properties of the minerals themselves. Montmorillonite has a higher adsorption of BDOM mainly because of the larger specific surface area. Providing more adsorption sites and more significant cation bridging. Hematite has preferential sorption for tyrosine/tryptophan proteins and fulvic acid components in BDOM through ligand exchange. For ABDOM, montmorillonite and hematite preferentially adsorb fulvic acid and humic acid components. |
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