Fujian Key Laboratory of Pollution Control & Resource Reuse

Fuzhou, China

Fujian Key Laboratory of Pollution Control & Resource Reuse

Fuzhou, China
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Xu Y.,Fujian Normal University | Xu Y.,Fujian Key Laboratory of Pollution Control & Resource Reuse | Li Z.,Fujian Normal University | Li Z.,Fujian Key Laboratory of Pollution Control & Resource Reuse | And 12 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2017

The color-tunable fluorescent LaOCl:Eu3+, Ce4+ nanofibers were successfully fabricated via an electrospinning combined with calcination route, in which PVA was employed as a template. XRD, TG–DTG results show that the heat-treatment of the nanofibers at 750 °C is enough to obtain highly crystallized LaOCl:Eu3+, Ce4+ samples. Scanning electron microscopy analysis indicates that LaOCl:Eu3+, Ce4+ nanofibers are composed of wafer nanograins with mean diameter of ~30 nm. Photoluminescence analysis shows that the luminescence intensity has changed with the varying Ce4+ doping content in LaOCl:Eu3+ nanofibers. Additionally, CIE chromaticity coordinates of LaOCl:5% Eu3+, x% Ce4+ nanofibers change from orange light region of (0.4997, 0.4828) and (0.5232, 0.4627) at x = 5.0 and 2.5 to red light region of (0.5661, 0.4251) at x = 1.7, then to orange light region of (0.5590, 0.4318) at x = 1.0, respectively. Hence the fluorescence color of LaOCl:Eu3+, Ce4+ nanofibers can be tuned by simply adjusting the Eu/Ce ratio, which is a promising candidate for application in LEDs. © 2017 Springer Science+Business Media New York


Luo Y.,Fujian Normal University | Luo Y.,Fujian Key Laboratory of Pollution Control & Resource Reuse | Xu Y.,Fujian Normal University | Xu Y.,Fujian Key Laboratory of Pollution Control & Resource Reuse | And 8 more authors.
Journal of Materials Science | Year: 2016

The fast recombination of photo-generated conduction band electrons (ecb −) and valance band holes (hvb +) of TiO2 results in an unsatisfactory photocatalytic performance for organic degradation. To increase the efficiency of charge separation, TiO2 was modified by Cu–Ce co-doping considering the better redox properties of copper–ceria oxide with respect to the single oxide, i.e., an easier electron capturing ability. An optimal Cu–Ce co-doped TiO2 with the initial molar ratio of Cu/Ce at 3:1 was prepared by a hydrothermal method with the aim to greatly promote the charge separation, and characterized by XRD, BET, DRS, PL, HR-TEM, and XPS techniques. Upon ultraviolet light irradiation, it exhibits significantly enhanced photocatalytic activity, about 5.8 times that of Ti–HF. The presence of Cu2+ and Ce3+/Ce4+ benefits electrons captured by molecular oxygen, while an increased hydroxyl groups upon Cu–Ce co-doping consume more holes, resulting in prolonged lifetime of photo-generated carriers. Moreover, it is proved that electron transfers preferably from conduction band (CB) of TiO2 to CB of CuO and then to nearby CeO2. © 2016 Springer Science+Business Media New York


Zhou W.-M.,Fujian Normal University | Zhou W.-M.,Fujian Key Laboratory of Pollution Control & Resource Reuse | Chen Q.-H.,Fujian Normal University | Chen Q.-H.,Fujian Key Laboratory of Pollution Control & Resource Reuse | And 7 more authors.
Wuji Cailiao Xuebao/Journal of Inorganic Materials | Year: 2014

Double-layer of titanium dioxide and Pr-doped calcium hydroxide were coated on the surface of mica by liquid phase deposition, and followed by calcination to form the Pr-doped calcium titanates fluorescent layer. The resultant CaTiO3:Pr3+/TiO2-mica fluorescent pearlescent pigments were characterized by photoluminescence excitation (PLE) and emission (PL), automatic colorimeter (AC), X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM), respectively. The fluorescent pearlescent pigments obtained at the calcium oxide cladding ratios of 5.3%, the praseodymium/calcium nitrate molar concentration of 0.2%, and the calcinations temperature of 900℃, show good pearl property with homogeneous, dense and smooth surface, and relatively high fluorescence intensity. The excitation spectrum of these fluorescent pearlescent pigments consists of three bands at 264, 304 and 380 nm. The maximum emission wavelength is found to be a red light of 613 nm, corresponding to the transition for 1D2→3H4. ©, 2014, Science Press. All right reserved.


Lin X.,Fujian Normal University | Qian Q.,Fujian Normal University | Qian Q.,Fujian Key Laboratory of Pollution Control & Resource Reuse | Xiao L.,Fujian Normal University | And 5 more authors.
Journal of Vinyl and Additive Technology | Year: 2016

Blends of recycled poly(ethylene terephthalate) (R-PET) and (styrene-ethylene-ethylene-propylene-styrene) block copolymer (SEEPS) compatibilized with (maleic anhydride)-grafted-styrene-ethylene-butylene-styrene (SEBS-g-MAH) were prepared by melt blending. The compatibilizing effects of SEBS-g-MAH were investigated systematically by study of the morphology, linear viscoelastic behavior, and thermal and mechanical properties of the blends. The results show that there is good agreement between the results obtained by rheological measurement and morphological analysis. The rheological test shows that the melt elasticity and melt strength of the blends increase with the addition of SEBS-g-MAH. The Cole-Cole plots and van Gurp-Palmen plots confirm the compatibilizing effect of SEBS-g-MAH. However, the Palierne model fails to predict the linear viscoelastic properties of the blends. The morphology observation shows that all blends exhibit a droplet-matrix morphology. In addition, the SEEPS particle size in the (R-PET)/SEEPS blends is significantly decreased and dispersed uniformly by the addition of SEBS-g-MAH. Differential scanning calorimeter analysis shows that the crystallization behavior of R-PET is restricted by the incorporation of SEEPS, whereas the addition of SEBS-g-MAH improves the crystallization behavior of R-PET compared with that of uncompatibilized (R-PET)/SEEPS blends. The Charpy impact strength of the blends shows the highest value at SEBS-g-MAH content of 10%, which is about 210% higher than that of pure R-PET. J. VINYL ADDIT. TECHNOL., 22:342–349, 2016. © 2014 Society of Plastics Engineers. © 2014 Society of Plastics Engineers

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