<p>The use of photocatalysis for wastewater treatment is an important area of research which is not yet fully exploited at an industrial level and has significant potential in the disposal of many industrial effluents particularly the effluents that are difficult to treat by conventional treatment processes. This reprint&nbsp;tries to know the latest advances in the field of wastewater treatment by photocatalysis. In this sense it is worth mentioning the treatments based on photolysis TiO2/solar light oxidants/ultraviolet irradiation oxidants/catalyst/ultraviolet irradiation etc. In addition the reprint&nbsp;describes catalyst manufacturing methods and reaction mechanisms.</p>