Abstract:
Water pollution by organic contaminants is one of the most severe issues confronting the world today as a result of the rapid increase
of industrialization, urbanization, human population growth, and advances in agricultural technologies. Several attempts have been made to
address global water pollution issues by utilizing conventional wastewater treatment technologies. However, conventional wastewater treatment
methods have several limitations such as low efficiency, high operation costs, generation of secondary waste, require additional chemicals as
oxidants and extra energy. Therefore, Heterogeneous photocatalysis has gained a lot of attention in the degradation of persistent organic pol lutants because it combines high efficiency, environmental friendliness, cheap cost, and safety. Subsequently, the designing of novel nanocom posite photocatalysts with strong visible light-harvesting ability, efficient charge separation and transportation, and superb stability is imminently
desired for wastewater treatment. Recently, the notion of combining g-C3N4 with TiO2 to design high photocatalytic performance heterojunction
photoactive nanocomposites for organic pollutant degradation has received a lot of attention. Meanwhile, the construction of g-C3N4/TiO2-based
heterojunction nanocomposites may enhance the ability of harvesting visible light, boost charge separation and transfer efficiency, and robust
photocatalytic activity. Firstly, this review concisely explained the main sources of water pollution, as well as potential treatment approaches
and the fundamental mechanism of heterogeneous photocatalysis. Subsequently, the details of properties, synthesis techniques, photoactivity
modification strategies, and photocatalytic applications of g-C3N4, TiO2, and g-C3N4/TiO2 heterojunction photocatalysts are presented. Following
that, the recent advances aimed at improving the photocatalytic performance of various types of visible-light-driven g-C3N4/TiO2 heterojunction
photocatalysts for organic pollutant degradation in wastewater are presented in detail. Finally, some concluding remarks and perspectives on
the challenges and opportunities for constructing different types of g-C3N4/TiO2-based heterostructured photocatalysts are presented
