以钛酸四丁酯为Ti源, 尿素为N源, 直接低温水热合成N掺杂TiO2粉末, 并以泡沫镍为载体负载N掺杂TiO2粉末. 采用XRD、SEM、TEM、UV-Vis和XPS对N掺杂TiO2粉末进行表征, 并研究了其可见光催化降解甲醛气体的性能. 结果表明N原子成功地掺杂到TiO2晶格中, 使其晶格常数a和c变大. N原子替代了晶格中部分O原子和Ti原子, N的化学价态表现为Ti-N-Ti和O-N-O形式, N掺杂TiO2可描述成Ti1-yO2-xNx+y-TiO2-xNx形式, 其吸收边界红移到600nm处. SEM结果表明N掺杂TiO2可以均匀弥散地分布于泡沫镍的载体上, 且具有高的可见光催化降解甲醛气体的能力.
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 Ti1-yO2-xNx+y-TiO2-xNx with its absorbing boundary wavelength red shifting to 600nm. N-doped nanosized TiO2 powders can be uniformly dispersed on nickel foam substrates, showing a high photocatalytic decomposition activity to formaldehyde under visible light.
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