School of Environmental & Safety Engineering, Liaoning Petrochemical University, Fushun 113001, China.
School of Environmental & Safety Engineering, Liaoning Petrochemical University, Fushun 113001, China.
Bioresour Technol. 2022 Aug;357:127316. doi: 10.1016/j.biortech.2022.127316. Epub 2022 May 18.
This study successfully prepared a novel sulfur-doped nano zero-valent iron @biochar (BM-SnZVI@BC) by modifying corn stover biochar with Fe and S using a mechanical ball milling method for effective phosphorus (P) adsorption in the waterbody. Batch experiments revealed that BM-SnZVI@BC (BC/S/Fe = 3:1:1) reached a Q 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.
本研究成功地通过机械球磨法在玉米秸秆生物炭上修饰 Fe 和 S 制备了一种新型的硫掺杂纳米零价铁@生物炭（BM-SnZVI@BC），用于水体中有效磷（P）的吸附。批量实验表明，BM-SnZVI@BC（BC/S/Fe=3:1:1）的 Q 值达到 25.00 mg P/g，符合 PFO 和 Langmuir 模型。本研究表明，静电吸引、表面化学沉淀、氢键和配体效应都有助于磷的去除。由于 FeS 层减轻了 nZVI 氧化诱导的表面钝化，硫化显著延长了 BM-SnZVI@BC 的使用寿命，即使在空气中老化 60 天后，仍能去除 84.4%的磷。复合材料的再生实验表明，重新球磨破坏了表面氧化铁层，从而改善了回收材料的性能。这是设计除磷剂以实现抗老化和工程应用中吸附剂商业化的重要步骤。
