Nature-Mimic Fabricated Polydopamine/MIL-53(Fe): Efficient Visible-light Responsive Photocatalysts for the Selective Oxidation of Alcohols
Polydopamine/MIL-53(Fe) (PDA/MIL-53(Fe)) nanocomposite photocatalysts were synthesized with PDA (PDA = polydopamine) and MIL-53(Fe) by a nature-mimic method. The structures, morphologies, optical properties and thermal stabilities of all the synthesized materials were characterized by a series of methods. In particular, the separation efficiency of photogenerated charge was significantly increased after the incorporation of PDA and MIL-53(Fe), which resulted in an elevated photocatalytic activity of PDA/MIL-53(Fe) compared with the control groups. PDA/MIL-53(Fe) nanocomposite could accelerate converting the primary or secondary alcohols to corresponding aldehydes or ketones under visible-light irradiation and room temperature by direct hole-involving oxidation with high specificity. The catalysts showed excellent recyclability and stability and could be cycled at least three times without significant catalytic activity decrease.