“…Introducing an impurity element into the host structure, called doping, is a common strategy to change and regulate the physicochemical characteristics of a photocatalyst. The dopants can be introduced into the lattice to replace a number of cations or anions in substitutional sites and/or occupy interstitial sites. , The photocatalyst characteristics that are alterable through doping include (1) photon absorption capability, (2) oxidation and reduction power of charge carriers, (3) concentration and spatial distribution of defects, (4) crystallinity, (5) particle size, and (6) surface structure. ,,,,− Doping appears to be applicable to overcome both bulk and surface issues. Recent reviews discussing doped photocatalysts are available in the literature. − …”