For deep purification of As(V) from drinking water by adsorption, two adsorbents S-FeOOH and S-MnO₂ were successfully synthesized by loading FeOOH and MnO₂ nanoparticles onto silica gel in situ. Characterization of the adsorbents implied that S-FeOOH and S-MnO₂ with large particle size (diameter of 150–250 µm) still had high specific surface areas (357.0 and 334.6 m²/g) due to their specific amorphous and porous structure. In batch experiments, the influences of pH, contact time, adsorbent dosage, and temperature on the adsorption were investigated. Comparing with other adsorbents reported, the synthesized adsorbents in this study, especially S-FeOOH, showed good performance for As(V) removal in a wide pH (2–12) and temperature (25–65 °C) range. The residual As(V) concentration after S-FeOOH treatment was around 0.01 mg/L, which met the drinking water standard. The adsorption process followed the pseudo-second-order kinetic model, and the adsorption equilibrium was reached within 5 min. The equilibrium adsorption data of S-FeOOH can be well fitted by the Langmuir isotherm, while that of S-MnO₂ followed Freundlich model, which indicated their different adsorption mechanisms. The results show that S-FeOOH is superior to S-MnO₂ in eliminating As(V), and S-FeOOH could be used as a promising adsorbent for the deep purification of As(V) in drinking water.

为了通过吸附从饮用水中深度净化 As(V)，通过将 FeOOH 和 MnO ₂纳米颗粒原位加载到硅胶上，成功合成了两种吸附剂 S-FeOOH 和 S-MnO ₂。吸附剂的表征表明，大粒径（150-250 µm）的S-FeOOH 和 S-MnO ₂仍然具有高比表面积（357.0 和 334.6 m ²/g) 由于其特定的无定形和多孔结构。在批量实验中，研究了pH值、接触时间、吸附剂用量和温度对吸附的影响。与报道的其他吸附剂相比，本研究中合成的吸附剂，尤其是 S-FeOOH，在较宽的 pH（2-12）和温度（25-65°C）范围内表现出良好的 As(V)去除性能。S-FeOOH处理后残留的As(V)浓度在0.01mg/L左右，符合饮用水标准。吸附过程遵循拟二级动力学模型，5 min内达到吸附平衡。S-FeOOH 的平衡吸附数据可以很好地由 Langmuir 等温线拟合，而 S-MnO ₂的平衡吸附数据可以很好地拟合遵循 Freundlich 模型，表明它们不同的吸附机制。结果表明，S-FeOOH在去除A​​s(V)方面优于S-MnO ₂，S-FeOOH可作为一种很有前景的吸附剂用于饮用水中As(V)的深度净化。