Phosphorus-containing biomass represents one kind of sustainable and environmental-benign precursor for transition metal phosphide synthesis. Herein, we adopt abundant agricultural biomass of rice bran as both P and C precursor to fabricate iron phosphide/biocarbon composite. Through a ball-milling pretreatment coupled with a molten salt-assisted pyrolysis process, Fe₂P/biocarbon composite (Fe₂P/BC) with high specific surface area is obtained. The as-synthesized composite could be applied as environmental material for model antibiotic pollutant (levofloxacin, LEV) removal from aqueous solution through adsorption and peroxymonosulfate (PMS) activation. Under the typical reaction conditions of 0.25 g L⁻¹ Fe₂P/BC, 0.1 g L⁻¹ PMS, pH 7 and room temperature, 96.60% of LEV (initial concentration 10 mg L⁻¹) could be removed within 60 min. Through quenching experiments and electron paramagnetic resonance (EPR) tests, active species including SO₄⁻•, •OH and ¹O₂ are found responsible for LEV degradation. Various reaction intermediates are detected by gas chromatography-mass spectrometry (GC–MS) and liquid chromatography-mass spectrometry (LC-MS), which enable us to propose the rational degradation pathways of LEV. Although the mineralization efficiency only reaches 39.02%, LEV degradation solution does show remarkably weakened antibacterial activity against Escherichia coli ATCC 8739 and Staphylococcus aureus ATCC 6538 compared with original LEV, indicating the possible low ecotoxicity of the developed Fe₂P/BC-PMS system for environmental remediation.

含磷生物质是一种可持续的、环境友好的过渡金属磷化物合成前体。在此，我们采用丰富的米糠农业生物质作为 P 和 C 前体来制造磷化铁/生物碳复合材料。通过球磨预处理结合熔盐辅助热解工艺，获得了具有高比表面积的Fe ₂ P/生物碳复合材料（Fe ₂ P/BC）。合成的复合材料可用作环境材料，用于通过吸附和过硫酸盐 (PMS) 活化从水溶液中去除模型抗生素污染物（左氧氟沙星，LEV）。在0.25 g L ^-1 Fe ₂ P/BC的典型反应条件下，0.1 g L ^-1PMS、pH 7 和室温下，96.60% 的 LEV（初始浓度 10 mg L ^-1）可在 60 分钟内去除。通过猝灭实验和电子顺磁共振 (EPR) 测试，发现包括 SO ₄ ^- •、•OH 和¹ O ₂在内的活性物质是 LEV 降解的原因。通过气相色谱-质谱 (GC-MS) 和液相色谱-质谱 (LC-MS) 检测各种反应中间体，这使我们能够提出 LEV 的合理降解途径。虽然矿化效率只有39.02%，但LEV降解液对大肠杆菌ATCC 8739和金黄色葡萄球菌的抗菌活性明显减弱ATCC 6538 与原始 LEV 相比，表明开发的 Fe ₂ P/BC-PMS 系统用于环境修复可能具有低生态毒性。