▎ 摘　　要

Graphene oxide with three-dimensional structure (3D-GO) was prepared using SiO2 spheres as sample followed by etching off of the SiO2 by NaOH solution. Brookite Ti3+-TiO2 with Ti3+ doping was synthesized by a thermal reduction method, and the composite photocatalyst Ti3+-TiO2@3D-GO was synthesized by supporting the as prepared Ti3+-TiO2 into 3D-GO through a hydrothermal process. The structure of the as prepared catalysts was characterized, and photocatalytic reduction performance of the catalysts from N-2/H2O to NH3 was investigated. The results show that the pitch-based 3D-GO has honeycomb structure with uniform pore size and exhibits excellent GO-like photoelectric properties. Using it as a carrier for Ti3+-TiO2 not only creates structural defects favorable to the photocatalytic reaction inside the composite catalyst but also retards the agglomeration of Ti3+-TiO2 nanorods. Meanwhile, the existence of 3D-GO makes the adsorption activation of Ti3+-TiO2@3D-GO to N-2 and the response intensity to visible light much higher than that of pure Ti3+-TiO2. The yield of NH4+ reached 26.426 mmol L-1 g(-1)center dot cat. after 4 h of photocatalytic reaction while the 75%-Ti3+-TiO2@3D-GO was used as a photocatalyst, which was 32.5 times higher than that of pure Ti3+-TiO2 under the same experimental conditions.