The fixed-bed column adsorption-desorption of As(V) by the porous composite of iron oxides and carbon with eucalyptus wood hierarchical microstructure (PC-Fe/C) was experimentally studied. The increase in the influent As(V) concentration and the inflow rate resulted in an earlier exhaustion of the column. The breakthrough curves indicated that a larger adsorbent mass, a smaller adsorbent grain size and a lower influent pH prolonged the column life span. The operating temperature had negligible effect. All breakthrough curves could be well fitted with the Thomas and Yoon–Nelson models. Under the condition of the influent flow rate of 5.136 mL/min, the influent As(V) concentration of 20 mg/L, the influent pH of 3, the adsorbent mass of 2 g, the adsorbent grain size of <100 mesh, and the operating temperature of 35 °C, the equilibrium adsorption capacity reached 10.49 mg/g, which was greater than those of natural/synthetic iron oxides adsorbents and iron-oxide-coated adsorbents.

中文翻译：

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磁铁矿/赤铁矿/碳的多孔复合材料与桉木微结构对砷(V)的固定床柱吸附

实验研究了具有桉木分级显微结构的铁氧化物和碳的多孔复合材料(PC-Fe/C)在固定床柱上对As(V)的吸附-解吸。进水 As(V) 浓度和流入速率的增加导致色谱柱提前耗尽。穿透曲线表明，较大的吸附剂质量、较小的吸附剂粒度和较低的进水 pH 值延长了色谱柱寿命。工作温度的影响可以忽略不计。所有突破曲线都可以很好地拟合 Thomas 和 Yoon-Nelson 模型。在进水流速5.136 mL/min、进水As(V)浓度20 mg/L、进水pH 3、吸附剂质量2 g、吸附剂粒度<100目、工作温度35°C，