Preparation of CaO loaded mesoporous Al2O3: Efficient adsorbent for fluoride removal from water

• Simple preparation route to synthesize CaO nanoparticles loaded mesoporous Al2O3.
• Higher fluoride removal capacity of CaO loaded Al2O3 than that of pure Al2O3.
• Faster fluoride adsorption kinetics of CaO loaded Al2O3 from water.

In this paper, we report a simple chemical method for the preparation of CaO loaded mesoporous Al2O3 based adsorbents, which can be used for fluoride removal from water. The synthesized adsorbents were characterized by using powder X-ray diffractometer, N2 adsorption–desorption surface area and pore size analyzer and high resolution transmission electron microscope. CaO loaded mesoporous aluminas exhibited poor crystalline mesoporous structure having γ-Al2O3 phase. The fluoride removal capacities of the synthesized adsorbents were evaluated using batch adsorption studies. Kinetic data revealed that, the fluoride sorption on 20 wt.% CaO loaded mesoporous Al2O3 was rapid, and ∼90% fluoride removal was achieved within 15 min. CaO loaded mesoporous Al2O3 showed higher fluoride adsorption capacity (137 mg/g) and faster kinetics than mesoporous Al2O3.

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