Element doping and construction of heterojunction composites were the most common ways to enhance g-C3N4, which were very attractive in achieving high photocatalytic activity. In this study, 2D nanosheet structure BCN was obtained by doping B atom with graphite carbon nitride. Then, Ti MOF was loaded on BCN to obtain a Z-scheme heterojunction composite TBCN through the calcination. Under simulated sunlight, the photocatalytic hydrogen production rate of TBCN heterostructure was 1242 μmol h-1/g, which was 2.2 times than that of BCN and 9.34 times that of bulk graphitic carbon nitrogen-containing (GCN), respectively. The experimental results showed that the construction of Z-scheme heterojunction composite (TBCN) could effectively adjust the material band gap position, expanded the light absorption range, enhanced electron transfer and inhibited the electron-hole recombination, which were crucial for efficient photocatalysis. This study not only provided a strategy for constructing heterojunction composites in the field of g-C3N4 photocatalytic hydrogen evolution, but also deeply analyzed the electron migration direction and the reasons for enhancing carrier separation in the Z-type heterojunction scheme, which provided potential help for subsequent researchers.

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