泡沫镍负载 N 掺杂 TiO₂ 及其可见光催化降解甲醛的性能

N-doped nanosized TiO₂ powders were directly synthesized by a low temperature hydrothermal method with tetrabutyl titanate as Ti resource and urea as nitrogen resource, and then immobilized on nickel foam substrates. N-doped TiO₂ powders were characterized by XRD, SEM, TEM, UV-Vis and XPS. The photocatalytic decomposition property of N-doped nanosized TiO₂ to formaldehyde under visible light was investigated. The result shows that nitrogen is incorporated into the TiO₂ lattice, so the lattice constants of TiO₂ increase (a and c). Nitrogen partially substitutes for oxygen and titanium in the TiO₂ lattice. The chemical statuses of N can be assigned to Ti-N-Ti and O-N-O in the TiO₂ lattice. N-doped TiO₂ may be described as Ti_1-yO_2-xN_x+y- TiO_2-xN_x with its absorbing boundary wavelength red shifting to 600 nm. N-doped nanosized TiO₂ powders can be uniformly dispersed on nickel foam substrates, showing a high photocatalytic decomposition activity to formaldehyde under visible light.