This critical review reports on recent advances over the past decade in heterogeneous photocatalytic conversion to organic value-added products that have the potential to provide a range of industrially important chemicals as a green route. The main focus was on the oxidation and reduction of organic compounds in the presence of photocatalysts. The conversion of biomass was also considered. Today titanium dioxide is the most abundant photocatalytic material due to its photoactivity under ultraviolet illumination, its stability under reaction conditions and its large surface area. Despite the obvious achievements in the field of photocatalysis, the major limitation of TiO2 is the large band gap for its various crystalline phases, which allows only the ultraviolet region to be used to initiate photocatalytic processes. In view of the efficient use of solar energy, the development of new photocatalysts that are sensitive to visible light is an important direction in the theory and practice of heterogeneous photocatalysis. In this critical review, special attention was paid to the use of organometallic frameworks in photocatalytic reactions, as they have proven to be an interesting class of materials for applications in organic photoreactions due to their flexible adjustability in composition, structure and functional properties, facilitated adsorption towards chemicals, and efficient light absorption.

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