Solvothermal-assisted Sol–Gel method Synthesized Amorphous Mesoporous Titania for Efficient Adsorption of Sb(III) in Aqueous Solution

Yang, Yepeng; Jiang, Liang; Tang, Qinyuan; Li, Mi; Xu, Peiwen; Chen, Daomei; He, Jiao; Chen, Yongjuan; Wang, Jiaqiang

Solvothermal-assisted Sol–Gel method Synthesized Amorphous Mesoporous Titania for Efficient Adsorption of Sb(III) in Aqueous Solution

2022

Amorphous mesoporous titania (AM-TiO₂) was prepared through the solvothermal-assisted sol–gel method. AM-TiO₂ exhibited a large specific surface area (675 m²/g) and a high adsorption capacity (252.7 ± 5.6 mg/g) for the removal of Sb(III) from aqueous solution, which was beyond the majority of previously reported Sb(III) adsorbent. The isotherms and kinetics studies indicated that the adsorption followed the Langmuir isotherm model and pseudo-second-order kinetics equation. Choosing N, N-dimethylformamide (DMF) as the solvent, as-synthesized AM-TiO₂ exhibited a remarkably enhanced adsorption capacity of Sb(III) compared with other solvents including acetone (209.6 mg/g), methyl alcohol (195.5 mg/g), ethyl alcohol (180.5 mg/g), and water (106.7 mg/g). Furthermore, the background ionic such as CO₃²⁻, Cl⁻, SO₄²⁻, and NO₃⁻ had a negligible impact on the adsorption properties of AM-TiO₂. The synergy among negative surface charge, large specific surface area, and abundant hydroxyl groups facilitates the adsorption of Sb(III). AM-TiO₂ was further utilized to the removal of Sb(III) in real polluted textile wastewater; meanwhile, Mn and chemical oxygen demand (COD) in the textile wastewater were simultaneously reduced as well.

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