Efficient photocatalytic CO2 cycloaddition over W18O49/NH2-UiO-66 composite catalyst
Zr-based metal-organic framework(MOF)NH2-UiO-66 was first synthesized by a solvothermal method using 2-amino terephthalic acid(H2ATA)as the ligand.The efficient W18O49/NH2-UiO-66 photocatalysts with a typi-cal type Ⅱ heterojunction were then constructed by in-situ growth of the oxygen vacancy-rich defective tungsten oxide(W18O49)on NH2-UiO-66,using tungsten chloride as the precursor.The composition and structure of the cata-lysts were characterized by a series of measurements,including powder X-ray diffraction,scanning electron micros-copy,X-ray photoelectron spectroscopy,and UV-Vis diffuse reflectance spectroscopy.At room temperature and atmospheric pressure,the photoactivity of all the catalysts was examined under simulated sunlight with styrene oxide as the model substrate.W18O49/NH2-UiO-66 exhibited the highest yield of styrene carbonate(58 mmol·g-1· h1).The introduction of NH2-UiO-66 expanded the specific surface area,CO2 adsorption capacity,light harvesting ability,and photogenerated charge carriers transfer of W18O49.
CO2 cycloadditionphotocatalysisW18O49metal-organic framework
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