FERROELECTRICS
·
2017
·
IF 0.551
Peisong Tang,Longlong Yu,Jiayuan Min,Jiani Yang,Haifeng Chen
Using Fe(NO3)3·9H2O, Yb(NO3)3·5H2O, citric acid and ethylene glycol as main raw materials, the gel of YbFeO3 was prepared by sol-gel method. The gel was kept at 100 °C for 36 h to make xerogel. Then, the xerogel was calcined in muffle furnace at 800°C to make YbFeO3 samples. The structure and morphology of samples were characterized by thermogravimetry and differential scanning calorimetry (TG-DSC), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and UV-visible diffuse reflectance spectroscopy (DRS). The results showed that the perovskite structure YbFeO3 was obtained through sol-gel method. The resulting products have a particle size of 80 nm and an optical band gap of 2.0 eV. Consequently, the YbFeO3 nanoparticles showed high photocatalytic activities for decomposition of methyl orange under visible-light irradiation.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Yepeng Xiao,Jincheng Liu,Yintao Lin,Wenjie Lin,Yanxiong Fang
The catalytic properties of graphene oxide (GO) - Ag nanocrystals are investigated to understand the effects of the size and morphology in the selective oxidation of cyclohexane. The GO-Ag nanoparticle composites (GO-Ag NPs) with smaller size show higher catalytic activity than those with bigger Ag nanoparticles, while GO-Ag nanorod composites (GO-Ag NRs) perform better catalytic property than GO-Ag NPs. The highest cyclohexane conversion of 37.0% with the selectivity of 94.0% to cyclohexanol and cylohexanone (KA oil) is obtained by using the photocatalysts of GO-Ag NRs under solar light irradiation at room temperature. The higher catalytic activity of GO-Ag NRs is caused by the stronger Surface Plasmon Resonance (SPR) effect of Ag NRs, and its facilitated generation of ·OH radicals. Both GO-Ag NPs and GO-Ag NRs possess great durability without evident decline of conversion efficiency and selectivity after five repeated consecutive runs. The research and finding in this work may pave a way for the development of high-performance catalysts and green chemical production processes.
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高影响因子
CRYSTENGCOMM
·
2016
·Vol. 19
·期 4
·727-733
·
IF 3.849
Huan Yu,Junli Wang,Tingting Wang,Hongsong Yu,Juan Yang,Guiwu Liu,Guanjun Qiao,Qing Yang,Xiaonong Cheng
A facile colloidal chemistry method is reported for synthesis of uniform Bi2S3 nanorods in a mixed solution of oleylamine with other organic amines including n-dodecylamine (C12), n-octylamine (C8), and n-hexylamine (C6). The nanorod length can be tuned through the carbon-chain length of these amines and importantly multigrams of Bi2S3 nanorods can be readily synthesized in a single scaled-up batch. Current–voltage (I–V) measurements showed that the Bi2S3 nanorods, obtained from both the small and large-scale batches or ones with different chain-length amines, exhibit fast light response characteristics (at the sub-second scale) with an obviously enhanced photocurrent (or photoconductivity) under broad-spectrum white light or monochromatic visible light of different wavelengths. The as-obtained nanorods, as determined by time-dependent current (I–t) curves, also exhibit excellent photoresponsive stability and reproducibility with the on–off switch of light. The photoconductivity enhancement in the Bi2S3 nanorods is assigned to the efficient electron–hole pair separation due to a hole-trapping mechanism. These results indicate the promising potential of Bi2S3 nanorods for optoelectronic device applications including photodetection (sensing), optical switch, photocatalysis, and photovoltaics within the visible spectrum range.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Rui Huo,Xue-Ling Yang,You-Qin Liu,Yue-Hua Xu
Visible-light-driven bismuth vanadate (BiVO 4 ) photocatalysts were prepared by the co-precipitation method. The BiVO 4 samples were characterized using X-ray diffraction, UV–visible diffuse reflectance, electrochemical impedance spectroscopy (EIS), photocurrent, and as well as electron microscopy (SEM, TEM). The photocatalytic activity of the as-prepared BiVO 4 samples was tested through the photocatalytic oxidation of glyphosate under visible light irradiation. The dark yellow amorphous BiVO 4 powder was prepared by the HAc method after drying at 70 °C, but the bright yellow monoclinic BiVO 4 was obtained after keeping at room temperature in the air for several days. The dependence of the room temperature crystallization on moisture can explain the low crystallization temperature found in this work. The BiVO 4 sample calcined at 400 °C by the HAc method showed the highest photocatalytic activity for glyphosate degradation under visible light irradiation because of its high charge separation efficiency proven by EIS and photocurrent.
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高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 30
·15710-15714
·
IF 7.443
Ming Wu,Jun-Min Yan,Xue-Wei Zhang,Ming Zhao,Qing Jiang
Ag2O modified g-C3N4 (Ag2O/g-C3N4) was synthesized by a facial hydrothermal reaction. The as-prepared Ag2O/g-C3N4 shows efficient photocatalytic properties for hydrogen evolution from water splitting under visible light irradiation. The rate is about 274 times higher than that of pure g-C3N4, and is even better than that of Pt/g-C3N4. More importantly, Ag2O/g-C3N4 also demonstrates a relatively good recycling stability for photocatalytic hydrogen evolution.
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高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-7
·
IF 5.578
Li Xiaodong,Wang Zhi,Zhang Zemin,Chen Lulu,Cheng Jianli,Ni Wei,Wang Bin,Xie Erqing
The photoelectrochemical (PEC) water splitting is hampered by strong bonds of H 2 O molecules and low ionic conductivity of pure water. The photocatalysts dispersed in pure water can serve as a water activation agent, which provides an alternative pathway to overcome such limitations. Here we report that the light illuminated α−Fe 2 O 3 /Pt nanoparticles may produce a reservoir of reactive intermediates including H 2 O 2 , ·OH, OH − and H + capable of promoting the pure water reduction/oxidation half−reactions at cathode and highly photocatalytic−active TiO 2 /In 2 S 3 /AgInS 2 photoanode, respectively. Remarkable photocurrent enhancement has been obtained with α−Fe 2 O 3 /Pt as water activation agent. The use of α−Fe 2 O 3 /Pt to promote the reactivity of pure water represents a new paradigm for reproducible hydrogen fuel provision by PEC water splitting, allowing efficient splitting of pure water without adding of corrosive chemicals or sacrificial agent.
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 20
·6138-6144
·
IF 0
Hongye Zhang,Yanfei Zhao,Sha Chen,Bo Yu,Jilei Xu,Huanjun Xu,Leiduan Hao,Zhimin Liu
Ti3+ self-doped TiOx@anatase core–shell structures were prepared via hydrolysis of Ti2(SO4)3 around TiO particles, followed by post-calcination at temperatures from 723 to 823 K. The as-prepared TiOx@anatase was examined by means of transmission electronic microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. It was demonstrated that the samples displayed core–shell structures with the shell in the anatase form and the core in the anatase and rutile phases, and a large number of Ti3+ ions were present. Electron paramagnetic resonance analysis indicated that the Ti3+ ions were located throughout the whole sample, including the shell, the core and the interface between the core and the shell. The as-prepared TiOx@anatase core–shell catalysts can absorb visible light and showed good activity for catalyzing the degradation of Rhodamine B under visible light irradiation. In particular, the TiOx@anatase obtained at 773 K showed the best performance, due to the high concentration of well-dispersed Ti3+ ions in the sample.
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RSC Advances
·
2012
·Vol. 2
·期 32
·12378-12383
·
IF 0
Xuefeng Hu,Huanhuan Ji,Lei Wu
Pure and Pt nanoparticle-modified rutile TiO2 were synthesized via hydrolysis of TiCl4 in the absence or presence of Pt nanoparticles. HRTEM, XRD, and SEM were used to characterize the structure of the prepared catalysts. The resulting modified TiO2 catalysts show extended visible light absorbance. Photodegradation of 2,4,6-trichlorophenol (2,4,6-TCP) over these photocatalysts was investigated under visible light illumination. The Pt nanoparticles facilitate the separation of photogenerated electron–hole pairs at low Pt content, then enhances the photodegradation rate of 2,4,6-TCP. 0.18Pt–TiO2 achieved the best photocatalytic activity among the tested catalysts. It was found that singlet oxygen rather than ˙OH acts as the main oxidative species for the degradation of 2,4,6-TCP according to the experimental results. The degradation intermediates of 2,4,6-TCP were identified and the degradation pathway was proposed. Pt nanoparticles on TiO2 significantly enhance O2 adsorption and the formation of ˙O2−. The rutile surface is a favorable condition for stabilizing ˙O2−. These properties of the Pt nanoparticle-modified rutile TiO2 facilitate the formation of 1O2via the reaction of superoxide anions with holes.
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RSC Advances
·
2014
·Vol. 5
·期 7
·5269-5276
·
IF 3.708
Qingjian Xing,Najun Li,Yang Jiao,Dongyun Chen,Jiaying Xu,Qingfeng Xu,Jianmei Lu
Herein, a core–shell nanocomposite was fabricated by self-assembly of the photo-responsive copolymer with silica-coated upconversion nanoparticles for near-infrared light-controlled drug release and cancer therapy. Firstly, lanthanide upconversion nanoparticles (UCNPs) co-doped with Yb3+ and Tm3+ were encapsulated with mesoporous silica as the core (MUCNPs). Then a folate conjugated light-responsive copolymer (PSMN-FA) was synthesized and coated on MUCNP as the shell via self-assembly. Anti-cancer drugs could be loaded into the mesopores of the silica layer before polymer coating. Upon near-infrared (NIR) light irradiation at 980 nm, the caged UCNPs emitted luminescence in the UV region, which could change the structure of the amphiphilic copolymer and separate it from the MUCNPs, immediately followed by the release of the pre-loaded drugs to the targeted cancer cells. Our model experiments in vitro verified that the nanocarrier MUCNPs@C18@PSMN-FAcan provide active tumor targeting to folate receptor over-expressed (FR+) tumor cells. Both in vitro and in vivo studies were carried out to evaluate the NIR-controlled drug release strategy and the promising application in anticancer therapy based on the polymer-UCNPs nanocomposites.
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高影响因子
Advanced Science
·
2015
·Vol. 2
·期 12
·1500116
·
IF 0
Lin Mei,Haitao Zhao,Bingan Lu
Recently, a growing amount of effort has been devoted to solving the widespread problem of pollution. Photocatalysts have attracted increasing attention for their widespread environmental applications. Here, a classic and simple electrospun technique is used to directly fabricate a porous a tungsten oxide nanoframework with graphene film as a photocatalyst for degradation of pollutants. The as-synthesized film simultaneously possesses substantial adsorptivity of aromatic molecules, extensive light absorption range, significant light trapping, and efficient charge carrier separation properties, which remarkably enhance photocatalytic activity. In the photodegradation of Rhodamine B, a significant photocatalytic enhancement in the reaction rate is observed, which has superior photocatalytic activity compared to other bare WO 3 and TiO 2 nanomaterials under visible-light irradiation.
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PubMed
RSC Advances
·
2014
·Vol. 4
·期 88
·47615-47624
·
IF 3.708
Ping Li,Chunbo Liu,Guoling Wu,Yang Heng,Shuang Lin,Ao Ren,Kehan Lv,Lisong Xiao,Weidong Shi
In this paper, Fe-doped SrTiO3 (FSTO) photocatalysts were successfully prepared via a facile solvothermal method, and their photocatalytic activities for degrading tetracycline (TC) under visible light irradiation were examined. It was found that doping Fe3+ into the lattice of SrTiO3 resulted in the formation of new absorption bands in the visible light region, and the energy band gap decreased from 3.2 eV to 2.6 eV with Fe3+ doping amounts of 0 to 5 wt%. The photocatalytic experimental results indicated that the as-prepared FSTO photocatalysts generate an extremely high enhancement in the TC degradation ratio compared to the pure SrTiO3 under visible light irradiation. In particular, the FSTO sample doped with 3% Fe exhibited the highest TC degradation ratio (71.6%) in 80 min, which is mainly attributed to the narrowed gap generated by the appropriate level of Fe3+ doping. This work suggests that this doping method should be applicable for exploiting other efficient visible light-driven photocatalysts with wide band gap semiconductors.
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高影响因子
CHEMICAL COMMUNICATIONS
·
2014
·Vol. 50
·期 21
·2755-2757
·
IF 6.718
Zhao Zhao,Huaqiao Tan,Haifeng Zhao,Yang Lv,Li-Jing Zhou,Yujiang Song,Zaicheng Sun
Stable reduced TiO2 rutile nanorods with well-defined facets were prepared by a solvothermal route in the presence of Zn powder. The oxygen vacancy in the TiO2 nanorods, which can be tuned by the amount of Zn, results in a narrow band gap and visible-light photocatalytic activity.
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PubMed
高影响因子
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