Oxygen vacancy-rich defective tungsten oxide (WO3_x) modified by Prussian blue for efficient photocatalytic carbon dioxide conversion and tetracycline degradation

photogenerated charge carriers and photothermal effect has been verified. The PB-modified WO3-x composites can also achieve complete tetracycline (TC) degradation in 30 min, and this excellent photo-Fenton TC removal activity is attributed to the combined action of active species (center dot OH, 1O2, h+, center dot O2-). This work aims to offer fresh perspectives on developing bifunctional photocatalysts for CO2 conversion and environmental remediation. The coupling of carbon dioxide (CO2) with epoxides to produce cyclic carbonates is a desirable decarbonization approach, but its commercial applicability is still restricted by the costly catalysts required, as well as the need for high temperature and high pressure. Herein, oxygen vacancy-rich defective tungsten oxide (WO3_x) rich in Lewis acid sites was modified by Prussian blue (PB), and the obtained composite reaches up to 94 % styrene carbonate yield (171 mmol g_ 1h_ 1) at ambient temperature and pressure, exhibiting outstanding advantages in the photocatalytic CO2 cycloaddition reaction compared with currently reported photocatalysts. It is found that the introduction of PB with photothermal properties significantly enhances the capability of WO3_ x to absorb and activate CO2 and epoxide, along with its light utilization ability. PB acts as an electron reservoir to promote the separation and migration of photoinduced electrons and holes. The synergistic catalytic effect between