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Synergetic effects of lanthanum, nitrogen and phosphorus tri-doping on visiblelight photoactivity of TiO_2 fabricated by microwave-hydrothermal process
姜洪泉 刘彦铎 李井申 王海燕
中国稀土学报:英文版, 2016, Vol.34 (6), p.604-613
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題名:
Synergetic effects of lanthanum, nitrogen and phosphorus tri-doping on visiblelight photoactivity of TiO_2 fabricated by microwave-hydrothermal process
著者:
姜洪泉 刘彦铎 李井申 王海燕
主題:
earths
;
effect
;
microwave-hydrothermal
;
photoactivity
;
rare
;
synergetic
;
TiO_2
;
tri-doping
;
visible-light
所屬期刊:
中国稀土学报:英文版, 2016, Vol.34 (6), p.604-613
描述:
Effects of La, N, and P doping on the structural, electronic and optical properties of TiO_2 synthesized from TiCl_4 hydrolysis via a microwave-hydrothermal process were investigated by X-ray diffraction, transmission electron microscopy, N_2 adsorption-desorption isotherm, X-ray photoelectron spectroscopy, electron paramagnetic resonance, UV-vis absorbance spectroscopy, photoelectrochemical measurements, and photoluminescence spectroscopy. The results showed that the presence of La in the tri-doped TiO_2 played a predominant role in inhibiting the recombination of the photogenerated electrons and holes. The existence of the substitutional N, interstitial N, and oxygen vacancies in TiO_2 lattices led to the band gap narrowing. It was P-doping rather than La or N doping that played a key role in inhibiting both anatase-to-rutile phase transformation and crystal growth, in stabilizing the mesoporous textural properties, and in increasing the content of surface bridging hydroxyl. Moreover, the tri-doping significantly enhanced the surface Ti^(4+)-O^(2-)-Ti^(4+)-O^(-·) species. All above-mentioned factors cooperated to result in the enhanced photoactivity of the tri-doped TiO_2. As a result, it exhibited the highest photoactivity towards the degradation of 4-chlorophenol(4-CP) under visible-light irradiation among all samples, which was much superior to commercial P25 TiO_2.
語言:
英文
識別號:
ISSN: 1002-0721
EISSN: 2509-4963
資源來源:
Elsevier ScienceDirect Journals Complete
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