Photocatalysis has been considered as one of the most favourable methodology for solving the energy crises and the environmental pollution. Henceforth, photocatalysis applications have a lot remarkable attention in various fields. The current review article employs a systematic review process based on the PRISMA mechanism to investigate several types of photocatalysts for varied applications. The research papers were taken during the years 2017 and 2021. The progress in the modification and development of photocatalysts is discussed in this article. In addition, possible methods for enhancing photocatalytic activity and separating photocatalysts from reaction medium are reviewed in order to offer a future direction in an effective photocatalyst design for a variety of applications