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  1. Free, publicly-accessible full text available June 1, 2024
  2. Abstract

    In this study, Mg2+‐doped mesoporous TiO2photocatalysts derived from Mg2+adsorption (MA) process on MIL‐125, a metal‐organic framework material, were prepared and employed for photocatalytic reduction of CO2to produce CO. The Mg2+doping concentration was controlled by varying the Mg2+concentration in the Mg2+adsorption process. It was demonstrated that the Mg2+doping promoted the generation of surface Ti3+and significantly increased transient photocurrent density. Over a 4 h UV/Vis irradiation period, the best performing photocatalyst, 1MA, delivered a CO production rate ∼20 times higher than that of P25, a commercially available TiO2nanopowder. It is believed that the Mg2+adsorption process introduced more favorable properties to the TiO2photocatalysts, such as higher surface area and porosity for more reactive sites, and concentrated surface Ti3+centers for improved charge transfer.

     
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