1 A review on the synthesis of the TiO2-based photocatalyst for the environmental purification https://jourcc.com/index.php/jourcc/article/view/jcc314 10.52547/jcc.3.1.4 20.1001.1.26765837.2021.3.6.4.7 1 TiO2 as a photocatalyst has been widely investigated and applied in many fields such as fuel cells, sterilization, and environmental decontamination. Some efforts, such as operation parameters, synthesis techniques, and improvements by doping have been made to improve its performance. To have a photocatalyst with high photocatalytic activity for environmental purification, the most important step is to know about the synthesis methods and the parameters and conditions that lead to preparing a highly photocatalytic active photocatalyst. This article paves the way in selecting the best synthesizing technique. In this article, the most common synthesis techniques of TiO2-based photocatalysts, including sol-gel, hydro-thermal, solvothermal, chemical vapor deposition, and physical vapor deposition have been reviewed. The most important results that have been achieved in the field of synthesis were collected. 25 42 Naghmeh Aboualigaledari University of North Carolina at Greensboro United States naghmeh.abuali@gmail.com Mohammad Rahmani Amirkabir University of Technology Iran info@jourcc.com TiO2-based photocatalyst liquid-phase processing Physical production techniques Environmental application Article4.pdf [1] A. Jafari Rad, Synthesis of copper oxide nanoparticles on activated carbon for pollutant re-moval in Tartrazine structure, Journal of Composites and Compounds 2(3) (2020). ##[2] A. Abuchenari, K. Hardani, S. Abazari, F. Naghdi, M. Ahmady Keleshteri, A. Jamavari, A. 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