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

打开文本图片集

中图分类号：TQ424；X703 文献标志码：A 文章编号：1672-2043（2025）05-1387-12 doi：10.11654/jaes.2024-0577

Abstract：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- 45.94m2⋅g-1 ）， and the magnetic proprieties formed（saturation magnetization ）. 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 8974.40mg⋅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+ ， Al 3+ ， Cl- ， NO3- ， 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.

Keywords：microplastics; biochar; adsorbent; adsorption mechanisms

塑料制品的广泛使用给社会生产及发展带来了巨大的效益。（剩余24087字）