Efficient removal of organic arsenic (roxarsone, ROX) from wastewater is highly demanded on the purpose of human health and environmental protection. This work aims to prepare Fe-N co-doped biochar (Fe-N-BC) via one-pot hydrothermal method using waste peanut shell, FeCl₃·6H₂O and urea, followed by pyrolysis. The effect of Fe-N co-doping on biochar's physicochemical properties, and adsorption performance for ROX were systematically investigated. At the pyrolysis temperature of 650 °C, Fe-N-BC-650 shows a significantly increased specific surface area of 358.53 m²/g with well-developed micro-mesoporous structure. Its adsorption capacity for ROX reaches as high as 197.32 mg/g at 25 °C, with > 90 % regeneration efficiency after multiple adsorption–desorption cycles. Correlation and spectral analysis revealed that the pore filling, π-π interactions, as well as hydrogen bonding play the dominant role in ROX adsorption. These results suggest that the Fe-N co-doped biochar shows great potential in the ROX removal from wastewater with high efficiency.

出于人类健康和环境保护的目的，对废水中有机砷（洛克沙胂，ROX）的高效去除提出了很高的要求。_{【摘要】：目的以废花生壳、FeCl 3} ·6H ₂ O和尿素为原料,采用一锅水热法制备Fe-N共掺生物炭(Fe-N-BC),并进行热解。系统研究了Fe-N共掺杂对生物炭理化性质和ROX吸附性能的影响。在650 ℃热解温度下，Fe-N-BC-650的比表面积显着增加，达到358.53 m ² /g，并具有发达的微介孔结构。25℃时其对ROX的吸附容量高达197.32mg/g，多次吸附-解吸循环后再生效率>90%。相关和光谱分析表明，孔隙填充、π-π相互作用以及氢键在ROX吸附中起主导作用。这些结果表明，Fe-N共掺杂生物炭在高效去除废水中的ROX方面显示出巨大的潜力。