▎ 摘　　要

In the present work, 4,4-bipyridine covalently-linked graphene monolith was prepared in a hydrothermal process. Meanwhile, the photocatalytic behavior of the as-prepared graphene monolith was explored in light driven H-2 evolution from water. The results indicate that the graphene monolith obtained consists of single or few-layered grapheme nanosheets covalently-linked with 4,4-bipyridine and possesses a 3D framework. Moreover, the graphene monolith is a promising photocatalyst for the photocatalytic H-2 evolution which is suitable for a continuous flow system. The rate of H-2 evolution is up to 1.07 mmol g(-1) h(-1) under optimal conditions.