期刊
BIORESOURCE TECHNOLOGY
卷 357, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127316
关键词
Ball-milled biochar; Phosphorus; Adsorbent; Sulfidation; Aging
资金
- Scientific Research Funding Project of the Educational Department of Liaoning Provincial [LJKZ0382, LJKZ0416]
This study successfully prepared a novel sulfur-doped nano zero-valent iron @biochar for effective phosphorus adsorption in the waterbody. The material showed good adsorption performance and the presence of iron sulfide layer extended the material's lifetime.
This study successfully prepared a novel sulfur-doped nano zero-valent iron @biochar (BM-SnZVI@BC) by modifying corn stover biochar with Fe-0 and S-0 using a mechanical ball milling method for effective phosphorus (P) adsorption in the waterbody. Batch experiments revealed that BM-SnZVI@BC (BC/S-0/Fe-0 = 3:1:1) reached a Q(max) of 25.00 mg P/g and followed PFO and Langmuir models. This work had shown that electrostatic attraction, surface chemical precipitation, hydrogen bonding, and ligand effects all contributed to P removal. Since the FeS layer mitigated the oxidation-induced surface passivation of nZVI, sulfidation significantly extended the lifetime of BM-SnZVI@BC, removing 84.4% of P even after 60 d aging in air. The regeneration experiments of composites showed that re-ball milling destroyed the surface iron oxide layer to improve the properties of the recovered material. This is an essential step in the design of P-removal agents to implement anti-aging and commercialization of adsorbents for engineering applications.
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