| 马迪,高熙韧,孟真,王燊,于飞,李春杰,滕春红.苹果酸改性生物炭对水体中莠去津的吸附性能[J].农业环境科学学报,2025,44(11):2981-2993. |
| 苹果酸改性生物炭对水体中莠去津的吸附性能 |
| Adsorption performance of malic acid-modified biochar on atrazine in water bodies |
| 投稿时间：2025-01-25 |
| DOI：10.11654/jaes.2025-0091 |
| 中文关键词: 苹果酸改性 莠去津 生物炭 吸附特性 |
| 英文关键词: malic acid modification atrazine biochar adsorption properties |
| 基金项目:中国科学院战略性先导科技专项（XDA28070305） |
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| 中文摘要: |
| 为探究苹果酸改性生物炭的结构特征和吸附性能，深入理解其吸附机制，为吸附水体环境中残留的莠去津提供可行的方法，本研究以铁观音茶叶梗为原料，在400、500、600℃和700℃下分别制备出TBC-400、TBC-500、TBC-600和TBC-700 4种茶叶梗生物炭，并筛选出吸附性能最佳的TBC-700，同时通过苹果酸梯度改性获得改性生物炭MTBC-1、MTBC-2和MTBC-3。采用扫描电镜、比表面积分析、傅里叶红外光谱等手段对原始及苹果酸改性生物炭进行结构表征分析，结合批量吸附实验探究其对水体中莠去津的吸附特性。结果表明：改性后生物炭的比表面积显著提升（MTBC-1比TBC-700提高了1.17倍），灰分降低57.97%~72.75%，微孔比例增加，表面极性官能团增多。吸附过程符合Langmuir等温模型，为放热反应。且动力学模型符合伪一级动力学模型和伪二级动力学模型，MTBC-1对莠去津的最大吸附量达24.95 mg·g-1，较未改性生物炭提高95.84%，且经5次再生后仍保持初始吸附率的95.54%。苹果酸改性降低了生物炭表面的芳香性，与原始生物炭相比极性增大。比表面积增大、孔结构发育更加完全、生物炭表面的极性官能团增多，使改性生物炭能够吸附更多的莠去津。吸附机制主要包括氢键作用、π-π电子供体-受体作用及静电吸引等多种机制。 |
| 英文摘要: |
| 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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