Noble-metal-free dye-sensitized selective oxidation of methane to methanol with green light (550 nm)

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Developing low-energy input route for conversion of methane (CH4) to value-added methanol (CH3OH) at room temperature is important in environment and industry.Bonding in electron donor-acceptor hybrid can potentially promote charge transfer and photocatalytic efficiency of CH4 conversion.Herein,bonding in electron donor rhodamine B (RhB)-acceptor (TiO2) hybrid (RhB/TiO2)significantly promotes the selectivity of photocatalytic oxidation of CH4 to CH3OH and utilization of visible light (low-energy photons) at ambient condition.Even under green light irradiation (λ =550 nm),the noble-metal-free RhB/TiO2 hybrid synthesized presents enhanced oxidation of CH4 to CH3OH with a generation rate of 143 pmol.g-1·h-1 and selectivity of 94%.This work demonstrates the possibility and feasibility of noble-metal-free catalysts for activating CH4 under visible light at room temperature.
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