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| Preparation of different magnetic biochar and its adsorption performance on microplastics in water |
| Received:July 08, 2024 |
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| KeyWord:microplastics;biochar;adsorbent;adsorption mechanisms |
| Author Name | Affiliation | E-mail | | QIN Hua | Hanzhong Environmental Monitoring Center Station, Hanzhong 723001, China | | | WU Juanjuan | School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China | wuj_fairy@163.com | | LI Qiaoyun | School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong 723001, China | | | LI Pengfei | School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong 723001, China | | | QI Wenbo | School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong 723001, China | | | SONG Fengmin | School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong 723001, China | |
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| 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- 45.94 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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