Photodegradation of hazardous organic pollutants using titanium oxides -based photocatalytic: A review

• Published in: Environmental research 2023-07, Vol.229, p.116000-116000, Article 116000
• Main Authors: Van Thuan, Doan, Ngo, Hoang Long, Thi, Huong Pham, Chu, Thi Thu Hien
• Format: Article
• Language: English
• Subjects: absorption; carbon dioxide; Catalysis; drugs; Environmental Pollutants; Hazardous organic pollutants; light; Modified TiO2; Organic dyes; Pharmaceuticals; photocatalysis; photocatalysts; Photolysis; photosynthesis; solar radiation; TiO2; Titanium; toxicity; wastewater; Wastewater treatment; Water
• ISSN: 0013-9351; 1096-0953
• DOI: 10.1016/j.envres.2023.116000

Titanium oxide-based photocatalysts (TOBPs) have been widely utilized as potential materials for numerous applications, such as wastewater treatment, water-splitting reactions, carbon dioxide (CO2) reduction and photosynthesis. However, the large bandgap of intrinsic TiO2 limits their absorption toward visible light, which is the central part of the solar spectrum, resulting in low photocatalytic activities under sunlight. To overcome this obstacle, several strategies, such as doping with either metal or non-metal elements or combining with other compounds, are efficient ways to reduce the bandgap of TiO2, leading to effectively extending their absorption toward the visible region and increasing their catalytic performance. In this review, we discussed the application of TOBPs for the photodegradation of hazardous organic pollutants in wastewater to produce quality reused water. The synthesis of TiO2 and the enhancement of photocatalytic activities of TOBPs by different techniques with detailed information were provided. Application of TOBPs for decomposing hazardous organic pollutants such as dyes, phenolic compounds and pharmaceuticals under optimum conditions have been listed. Also, the photodegradation mechanisms of hazardous organic compounds have been investigated. This work also brings ideas for future perspectives and research plan to inhibit the disadvantages and expand the application of TOBPs to remove toxic organic pollutants. •TiO2-based photocatalysts (TOBPs) for removing hazardous pollutants were reviewed.•TOBPs had high removal performance of organic dyes.•Pharmaceuticals can effectively be removed from wastewater by TOBPs.•TOBPs also had excellent degradation efficiency with other organic pollutants.