Deep purification of As(V) in drinking water by silica gel loaded with FeOOH and MnO₂

Abstract

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.

Keywords

As(V) removal / adsorption / drinking water / composite material

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