Z-scheme quantum dots/g-C3N4-based hybrid photocatalysts for efficient water purification: Band alignment, interface design, and integrated treatment platforms

초록

Development of sustainable photocatalytic materials to purify wastewater has been an important strategy to face challenges of water scarcity and pollution. Quantum dots (QDs)-modified graphitic carbon nitride (g-C3N4) has attracted enormous attention among the numerous semiconductor-based systems due to its band structure, high visible light activity and ability to construct Z-scheme heterojunctions with superior charge separation. This review summarizes recent advancements in the field of QDs/g-C3N4 Z-scheme photocatalysts with a particular emphasis on the degradation of pollutants and treatment of wastewater. The basics of Z-scheme charge transfer mechanisms are critically discussed, followed by an overview of synthesis strategies. The review serves as a forward-looking bridge between the understanding and application-driven development of QD/g-C3N4 Z-scheme photocatalysts for sustainable water purification. This review suggests that QDs/g-C3N4 based heterostructured hybrids show the potential as Z-scheme photocatalysts for wastewater treatment, thereby contributing to the objectives of the United Nations Sustainable Development Goals (SDGs) 6 and 13.

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