One-step synthesis of Cu/N co-doped TiO 2 nanocomposites with enhanced photocatalytic activities under visible-light irradiation

[摘要] In this research, a one-step hydrothermal method is used to prepare Cu-doped, N-doped and Cu/N co-doped titanium dioxide (TiO 2 ) composites, and the doping effects on the structures, absorption and photocatalytic performance are investigated. All the products are in anatase structure. The substitution of Cu atoms in TiO 2 and distribution of N in the crystal lattice have been identified by X-ray diffraction, which lead to the decrease of grain size. Hollow micro-nanospheres of Cu-TiO 2 samples, which make them have strong dark adsorption properties, can be observed. Cu/N co-doped samples exhibit the maximum light absorption in the visible light region, and a red-shift which is responsible for narrow band gap energy owing to the presence of N-atoms and Cu-atoms in the TiO 2 lattice. The synergistic effect of Cu and N results in the enhanced photocatalytic activity for degradation of methyl orange under visible light irradiation.

[学科分类] 计算机科学（综合）

[关键词] Structure of solid clusters;nanoparticles;nanotubes and nanostructured materials;Microstructure;Adsorption and desorption kinetics;evaporation and condensation;Low-dimensional structures: growth;structure and nonelectronic properties;Crystal growth from solution;Photolysis and photodissociation by IR;UV and visible radiation;Heterogeneous catalysis at surfaces and other surface reactions;Sorption and accommodation coefficients (surface chemistry);Nanofabrication using crystal growth techniques;Optical properties of composite materials (thin films;low-dimensional and nanoscale structures);Photocatalysis;Structure of nanocomposites