Co-reporter:Hui Sun, Bohua Dong, Liang Song, Jianwei Du, Rongjie Gao, Ge Su, Lixin Cao
Journal of Photochemistry and Photobiology A: Chemistry 2017 Volume 334() pp:20-25
Publication Date(Web):1 February 2017
DOI:10.1016/j.jphotochem.2016.10.033
•Ferric tartrate modified titania nanotubes were synthesized.•The photocatalytic activity of catalyst is enhanced through photo-Fenton reactions.•The optimal degradation rate of methyl orange is over 99% with 3 h light irradiation.Photo-Fenton reactions are introduced into the decomposition process of methyl orange (MO) through modification of TiO2 nanotubes (TNT) by ferric tartrate. With respect to pure TNT, an enhanced photocatalytic activity of ferric tartrate/TNT is obtained. When the ferric tartrate content is about 5.0%, the degradation rate to MO solution is over 80% after 180 min UV–vis light irradiation. With excessive ferric tartrate introduced into the catalysts, this high photocatalytic performance is depressed. In addition, the photocatalytic activity of the nanocomposites can be optimized by varying the crystallized temperature of TNT precursor. In our experimental conditions, the optimal photocatalytic activity is achieved for the sample pre-crystalized at 773 K (with 5.0 at.% ferric tartrate). Its degradation efficiency to MO reaches 99% within 180 min UV–vis light irradiation.
Co-reporter:Hui Sun, Bohua Dong, Ge Su, Rongjie Gao, Wei Liu, Liang Song, Lixin Cao
Applied Surface Science 2015 Volume 343() pp:181-187
Publication Date(Web):15 July 2015
DOI:10.1016/j.apsusc.2015.02.148
Highlights
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WO3/titania nanotubes are synthesized at low temperature (383 K) by a novel approach.
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WO3/titania nanotubes present enhanced photocatalytic activity.
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The substitution of Ti4+ by W6+ does not occur in nanocomposites at 383 K.
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Diffuse reflectance spectra of WO3/TNTs exhibit a red shift due to WO3 connection.
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The optimal degradation rate of MO could reach 95% within 2 h irradiation.
Co-reporter:Xinying Qi, Ge Su, Guoshuai Bo, Lixin Cao, Wei Liu
Surface and Coatings Technology 2015 Volume 272() pp:79-85
Publication Date(Web):25 June 2015
DOI:10.1016/j.surfcoat.2015.04.020
•Ionic liquid was used as electrodeposition media for the preparation of NiO films.•NiO and NiO/TiO2 films show good cycle life, stability and fast response time.•NiO/TiO2 film performs good electrochromic function and photocatalytic activity.•NiO/TO2 film at different states demonstrates different photocatalytic activities.NiO and NiO/TiO2 films were prepared on fluorine doped tin oxide (FTO) coated glass substrates by electrochemial deposition and sol–gel method. Choline chloride–urea ionic liquid was used as electrodeposition media. The composition, morphology and microstructure of the films were characterized by a scanning electron microscope (SEM) and X-ray diffractometer (XRD). Cyclic voltammetry (CV), cycle life, response time and transmittance of the films were measured and compared with each other. Photocatalytic activity of the NiO/TiO2 film was examined and explained through the degradation of methyl orange. Results show that, after 8000 cycles, both NiO and NiO/TiO2 films still maintain their good electrochromic property and stability. The NiO/TiO2 film not only performs excellent electrochromic function but also displays a certain photocatalytic activity. And interestingly, the NiO/TiO2 film at bleached and colored states demonstrates different photocatalytic activities, which are higher than that at as-prepared state.
Co-reporter:Lili Zhao, Ge Su, Wei Liu, Lixin Cao, Jing Wang, Zheng Dong, Meiqin Song
Applied Surface Science 2011 Volume 257(Issue 9) pp:3974-3979
Publication Date(Web):15 February 2011
DOI:10.1016/j.apsusc.2010.11.160
Abstract
Cu-doped nickel oxide (NiO) thin films were prepared by electrochemial deposition (cathodic deposition) technique onto the fluorine doped tin oxide (F: SnO2; FTO) coated glass substrates from organic solutions. Effects of Cu content on the morphology, structure, optical and electrochromic properties of NiO films were investigated by means of scanning electron microscope (SEM), X-ray diffraction (XRD), ultraviolet–visible spectrophotometer (UV–vis) and cyclic voltammetry (CV), respectively. SEM images indicated the formation of nanorods after Cu was added. The films were formed with amorphous or short-range ordered NiO grains and a trace of face-centered cubic NixCu1−xO confirmed by XRD. The transmittances of both bleached state and colored state were significantly lowered when Cu was added. The NiO films doped with Cu (the molar ratio was 1/8) exhibited the optimum electrochromic behavior with a variation of transmittance (ΔT) up to ∼80% at the wavelength range of 350–600 nm. Cu doping reduces the response time for both the coloring and bleaching states, and the reversibility of the redox reaction was increased as well.
Co-reporter:Ge Su;TianZhong Liu;Wei Liu;LiXin Cao
Science China Technological Sciences 2010 Volume 53( Issue 6) pp:1562-1566
Publication Date(Web):2010 June
DOI:10.1007/s11431-010-3101-x
InP vertical porous arrays were produced using electrochemical etching at room temperature. The as-etched InP samples were annealed in an ultra high vacuum camber. Cross-sectional analysis of the porous layer was conducted using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). Annealing in vacuum was found to meliorate the structural quality of the porous layer. EDX results showed the composition change of the porous InP. By controlling the annealing process parameters, the content ratio of phosphorus (P) to indium (In) is tuneable. Raman property of the samples was also investigated at room temperature. Compared with the sample without annealing treatment, Raman spectrum from the annealed sample showed red-shifted LO and TO peaks together with sharpened LO peak and shortened TO peak.
Co-reporter:Ge Su, Zhenzhen Lin, Xinying Qi, Guoben Zhu, Wei Liu, Lixin Cao
Journal of Environmental Chemical Engineering (June 2015) Volume 3(Issue 2) pp:1408-1415
Publication Date(Web):1 June 2015
DOI:10.1016/j.jece.2014.12.003
•Synthesized SiO2@Cu core–shell particles show good photocatalytic activity.•Decolorization efficiency up to 97% for methyl violet was reached.•XPS spectrum and element mapping confirm the shell composition (Cu/CuO).•Apparent rate constant kMV is 9.75 times as high as kMB.•Forming process and photocatalytic mechanism of SiO2@Cu particles were proposed.Cu is usually used as a metal catalyst in chemical industry and sewage treatment. This work revealed its potential application as a photocatalyst. Heterogeneous deposition–precipitation was adopted to prepare SiO2@Cu catalyst. Products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). It was found that the main component of the shell is Cu. Only a little Cu was oxidized into CuO. The formation process of the SiO2@Cu core–shell structure was expounded. Photocatalytic activity of the catalyst was examined and explained through the decolorization of three organic dyes. The decolorization rate of methyl violet reached up to 97% after UV irradiation for 3 h. While, for methylene blue, it is relatively low. The reason for the selective decolorization was analyzed according to our proposed photocatalytic mechanism. The important action of Cu during the photocatalytic process is confirmed.Download high-res image (151KB)Download full-size image
