| 秦华,吴娟娟,李巧云,李鹏飞,齐文博,宋凤敏.新型磁性生物炭制备及其对水中聚苯乙烯微塑料吸附性能与机制[J].农业环境科学学报,2025,44(5):1387-1398. |
| 新型磁性生物炭制备及其对水中聚苯乙烯微塑料吸附性能与机制 |
| Preparation of different magnetic biochar and its adsorption performance on microplastics in water |
| 投稿时间：2024-07-08 |
| DOI：10.11654/jaes.2024-0577 |
| 中文关键词: 微塑料 生物炭 吸附 吸附机制 |
| 英文关键词: microplastics biochar adsorbent adsorption mechanisms |
| 基金项目:国家环境保护重金属污染监测重点实验室开放基金课题项目（SKLMHM202305）；陕西理工大学秦巴生物资源与生态环境重点实验室“市校共建”科研专项（SXJ-2016） |
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| 中文摘要: |
| 为探讨生物炭对水体中微塑料的去除效果，降低其带来的潜在环境风险，本研究对废弃生物质玉米秸秆（CB）进行单金属（Fe）和双金属（Fe/Ni）改性，制备两种磁性生物炭（MCB和MCB-Ni）来吸附水体中典型聚苯乙烯微塑料（PS-MPs），并进行材料表征分析、吸附性能研究和吸附机理探讨。表征结果显示金属改性后的生物炭比表面积增大27%~139%（24.41~45.94 m2·g-1），有磁化特性生成（饱和磁化强度5.88~8.29 emu·g-1）；试验证实MCB和MCB-Ni对PS-MPs均有吸附能力，其中MCB-Ni的吸附性能更好，对MPs的最大吸附量为8 974.40 mg·g-1，是MCB最大吸附量的3.43倍；酸性条件更有利于MCB和MCB-Ni对MPs的吸附；水中Na+及其他离子（K+、Ca2+、Mg2+、Al3+、Cl--、NO3-和SO24-）的存在对MCB和MCB-Ni吸附PS-MPs的抑制作用影响小；吸附-解吸试验结果表明，吸附PS-MPs后的磁性生物炭可以通过热处理（500℃）回收，5次使用后仍具有强的吸附能力（80%以上）；吸附机理分析结果揭示MCB和MCB-Ni吸附MPs在高温下可以自发进行，主要吸附机制包括孔隙填充、静电吸引、表面络合以及π-π相互作用。 |
| 英文摘要: |
| To investigate the effectiveness of biochar in removing microplastics from aquatic environments and to reduce the potential environmental risks they pose. In this study, two types of magnetic biochar（MCB and MCB-Ni）were prepared by modifying corn straw biomass waste（CB）with single metal（Fe）and bimetallic（Fe / Ni）. Meanwhile, characterization analysis, adsorption performance, and mechanism exploration were conducted. The characteristic results indicated that the specific surface area increased by 27%-139%（24.41- 45.94 m2·g-1）, and the magnetic proprieties formed（saturation magnetization 5.88-8.29 emu·g-1）. The results showed that the adsorption capabilities of both MCB and MCB-Ni on PS-MPs, with MCB-Ni exhibiting a better adsorption performance, reaching a maximum adsorption of 8 974.40 mg·g-1 MPs, and 3.43 times higher than MCB's. Acidic conditions favored MPs removal by both materials, while salinity ions including Na+ and other cationic interferences（K+, Ca2+, Mg2+, Al3+, Cl--, NO -3, and SO42-）, had limited impact. Adsorptiondesorption experiments indicated successful magnetic biochar recovery through heat treatment（500 ℃）, retaining over 80% adsorption capacity after 5 uses. The mechanism exploration revealed that MCB and MCB-Ni spontaneously adsorb MPs at higher temperatures, the main adsorption mechanisms including pore filling, electrostatic attraction, surface complexation, and π-π interactions. |
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