TY - JOUR
T1 - 可见光响应氮掺杂 TiO2 光催化剂的水热法制备与性能
AU - Wang, Yichao
AU - Liu, Zhongqing
AU - Yan, Qingzhi
AU - Li, Zhenhua
AU - Ge, Changchun
PY - 2008
Y1 - 2008
N2 - By using technical grade TiOSO4 as the precursor and urea as the precipitating agent, N-doped TiO2 nanopowders were prepared by hydrothermal homogeneous precipitation and heat treatment. The properties of the prepared powders were characterized by XRD, XPS, BET, UV-Vis absorbance spectra, FTIR, and BET methods. By using an electronic energy-saving lamp as the light source, taking methylene blue as the model pollutant, their photo catalytic activities under visible-light irradiation were also investigated. The result showed that the products after 900ðC heat treatment were all anatase. When the temperature came to 1000ðC, almost all of them were converted into rutile. Taking urea as the nitrogen source, XPS analyses of particles prepared by hydrothermal powders after heat treatment indicated that the N1s peak was close to 399 eV. Furthermore, N replacing a small amount of lattice oxygen to form TiO2-xNy(y≥x) was further demonstrated by FTIR. UV-Vis absorbance spectra showed that adding the nitrogen source during heat treatment was necessary to the red-shifted in the absorption band-edge and the binding ratio of photo-generated electrons. The particle size calculated by XRD accorded with the result analyzed by TEM. All results show that nitrogen-doped TiO2 after heat treatment had a higher photo catalytic activity in visible light.
AB - By using technical grade TiOSO4 as the precursor and urea as the precipitating agent, N-doped TiO2 nanopowders were prepared by hydrothermal homogeneous precipitation and heat treatment. The properties of the prepared powders were characterized by XRD, XPS, BET, UV-Vis absorbance spectra, FTIR, and BET methods. By using an electronic energy-saving lamp as the light source, taking methylene blue as the model pollutant, their photo catalytic activities under visible-light irradiation were also investigated. The result showed that the products after 900ðC heat treatment were all anatase. When the temperature came to 1000ðC, almost all of them were converted into rutile. Taking urea as the nitrogen source, XPS analyses of particles prepared by hydrothermal powders after heat treatment indicated that the N1s peak was close to 399 eV. Furthermore, N replacing a small amount of lattice oxygen to form TiO2-xNy(y≥x) was further demonstrated by FTIR. UV-Vis absorbance spectra showed that adding the nitrogen source during heat treatment was necessary to the red-shifted in the absorption band-edge and the binding ratio of photo-generated electrons. The particle size calculated by XRD accorded with the result analyzed by TEM. All results show that nitrogen-doped TiO2 after heat treatment had a higher photo catalytic activity in visible light.
UR - https://hdl.handle.net/1959.7/uws:72188
U2 - 10.13374/j.issn1001-053x.2008.05.007
DO - 10.13374/j.issn1001-053x.2008.05.007
M3 - Article
SN - 1001-053X
VL - 30
SP - 540
EP - 543
JO - Journal of University of Science and Technology Beijing
JF - Journal of University of Science and Technology Beijing
IS - 5
ER -