▎ 摘　　要

Novel nanocomposite, in which nickel-titanium (Ni-Ti)-layered double hydroxide (LDH) nanoplates were deposited on the surface of graphene nanosheets (GNSs), was synthesised by a simple in situ crystallisation technique. Owing to the introduction of GNS and the formation of layered heterostructure, the visible (vis)-light absorption was enhanced, while the recombination probability of photogenerated electron-hole pairs was decreased. As a result, the obtained Ni-Ti LDH/GNS composite showed an enhanced vis-light photocatalytic performance for the degradation of methylene blue. The corresponding photocatalytic mechanism was discussed according to the active species capture experimental results, which indicated that the active species of (OH)-O-center dot was the most crucial one while O-2(center dot-) and h(+) were the less crucial ones. This work may provide an insight for designing graphene-based layered photocatalysts with a high performance.