Research publications in photocatalysis continues to increase over the years and the focus is on finding a suitable photocatalyst with enough efficiency for commercial solar hydrogen production from water and for pollutant degradation rather than on replacing any noble metal. Due to its visible light absorption capability, carbon nitride has replaced TiO2 as the most studied photocatalyst and continues to grow rapidly. Though the reactions and uses in photocatalysts are mostly related to hydrogen production and pollutant degradation, a small but considerable number of them are related to light driven organic reactions and organic photocatalysts.