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| Adsorption performance of malic acid-modified biochar on atrazine in water bodies |
| Received:January 25, 2025 |
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| KeyWord:malic acid modification;atrazine;biochar;adsorption properties |
| Author Name | Affiliation | E-mail | | MA Di | College of Plant Protection, Northeast Agricultural University, Harbin 150030, China | | | GAO Xiren | College of Plant Protection, Northeast Agricultural University, Harbin 150030, China | | | MENG Zhen | College of Plant Protection, Northeast Agricultural University, Harbin 150030, China | | | WANG Shen | College of Plant Protection, Northeast Agricultural University, Harbin 150030, China | | | YU Fei | Agricultural and Animal Husbandry Bureau of Aohan Banner, Chifeng City, Inner Mongolia Autonomous Region, Chifeng 024300, China | | | LI Chunjie | Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China | | | TENG Chunhong | College of Plant Protection, Northeast Agricultural University, Harbin 150030, China | tchgrace@163.com |
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| Abstract: |
| In order to investigate the structural characteristics and adsorption properties of malic acid-modified biochar, and to deeply understand its adsorption mechanism, and to provide a feasible method for the adsorption of residual atrazine in the aqueous environment, four types of tea stems were prepared at 400, 500, 600 ℃ and 700 ℃（TBC-400, TBC-500, TBC-600 and TBC-700）, and TBC-700 with the best adsorption performance was screened out, and the modified biochars MTBC-1, MTBC-2 and MTBC-3 were obtained by malic acid gradient modification. Scanning electron microscopy（SEM）, specific surface area analysis（SSA）and Fourier transform infrared （FTIR）spectroscopy were used to characterise the structure of the original and malic acid-modified biochars, and batch adsorption experiments were carried out to investigate the adsorption characteristics of the modified biochars on atrazine in the water body. The results showed that the specific surface area of the modified biochar increased significantly（MTBC-1 increased by 1.17-fold compared with TBC- 700）, the ash content decreased by 57.97%-72.75%, the proportion of micropores increased, and the number of polar groups on the surface increased, and the adsorption process conformed to the isothermal model of Langmuir, which was an exothermic reaction. The maximum adsorption of atrazine by MTBC-1 reached 24.95 mg·g-1, which was 95.84% higher than that of unmodified biochar, After five regeneration cycles, it retains 95.54% of its initial adsorption efficiency. The modification of malic acid reduced the aromaticity of the biochar surface and increased the polarity compared with the original biochar. The increase in specific surface area, the complete development of pore structure increased and the number of polar functional groups on the surface of the biochar, which enabled it to adsorb more atrazine. The adsorption mechanisms include hydrogen bonding, π-π electron donor-acceptor interaction and electrostatic attraction. |
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