Growth of g-C3N4 on mesoporous TiO2 spheres with high photocatalytic activity under visible light irradiation

Xiaofang Chen, Jing Wei, Rujing Hou, Yan Liang, Zongli Xie, Yonggang Zhu, Xiwang Zhang, Huanting Wang

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Growth of graphitic carbon nitride on mesoporous TiO2 spheres with well-controlled structures was achieved by melt-infiltrating dicyandiamide (DICY). The molten DICY diffused into the porous structure of TiO2 , and g-C3 N4 was produced inside the mesopores formed by packing of TiO2 nanoparticles at higher temperature, resulting in a better fused g-C3 N4 -TiO2 heterostructure. The formation of a strong interfacial connection between TiO2 and g-C3 N4 by this preparation method greatly improved the separation efficiency of photo-generated electrons and holes. TiO2 /g-C3 N4 composites exhibited much higher photo- catalytic activity than TiO2 and g-C3 N4 towards the degradation of Rhodamine B under both UV light and UV–vis light irradiation. The heterostructured combination provided a synergistic photocatalytic activity through an efficient electron transfer process. Based on the experimental results, a possible mechanism for the improved photocatalytic performance was proposed. The factors affecting the photocatalytic activ- ity were also discussed based on the result of structure analysis, optical and photoelectric characteristics, and photocatalytic reactions.
Original languageEnglish
Pages (from-to)342 - 350
Number of pages9
JournalApplied Catalysis B: Environmental
Publication statusPublished - 2016

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