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Cui W.,Hebei United University | Cui W.,Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials | Lin S.,Hebei United University | Ma S.,Hebei United University | And 2 more authors.
Advanced Materials Research | Year: 2013

The composite Ag2S/K2Ti4O9 photocatalyst was synthesized via a precipitation method. The structure of the photocatalyst was determined by powder X-ray diffraction, scanning electron microscope. The photocatalytic properties for organic matter degradation of the photocatalyst were examined under visible light irradiation. The results showed that, the sample which synthesized at 25°C via a precipitation route, using nitric acid silver and thiourea as the raw materials in the absence of any surfactants or templates has the highest crystallinity and investigated its catalytic behavior. RhB as degradation object, different dosing quantity of the degradation rate were examined, the best dosing quantity (1000 MgL-1) degradation rate was 18.93%. And with K2Ti4O9 for ontology, the degradation of different load rate were examined, the best load (25%) of the degradation rate is 20.57%. The results revealed the Ag2S potential applications in photocatalytic degradation for organic pollutants. © (2013) Trans Tech Publications, Switzerland. Source


Hu J.-S.,Hebei United University | Wang H.,Hebei United University | Liu L.,Hebei United University | Cui W.-Q.,Hebei United University | And 2 more authors.
Journal of Molecular Catalysis | Year: 2013

A highly efficient and stable visible light driven Ag@AgBr plasmonic photocatalyst was successfully fabricated through a hydrothermal and subsequently photo-reduction method. The as-prepared samples were characterized using XRD, SEM, EDX, DRS and XPS methods. The photocatalytic activities of the samples were evaluated by the degradation of Rhodamine B (RhB) under visible light irradiation. Recycling runs and scavengers were examined. The results show that the as-prepared Ag@AgBr plasmonic photocatalysts showed a strong absorption in visible light region, which attributes to the plasmon resonance of Ag NPs anchored on the surface of AgBr particles. The obtained Ag@AgBr photocatalyst showed excellent and stable photocatalytic performance for the degradation of RhB and more than 95% of RhB could be degradated in 90 min under visible light irradiation. Besides, after five recycled experiments the photocatalytic activity almost kept unchanged. The photodegradation was greatly suppressed by benzoquinone while slightly decreased by isopropanol and NaHCO3. The mechanism for the degradation of RhB by Ag@AgBr under visible light irradiation was discussed. Source


Liang Y.,Hebei United University | Wang H.,Hebei United University | Liu L.,Hebei United University | Cui W.,Hebei United University | Cui W.,Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2015

A facile synthesis for Ag@AgCl plasmonic photocatalysts with high photocatalytic efficiency of organic pollutants under visible light was done by the precipitation-visible light irradiation method. The sample was characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectra (DRS), and X-ray photoelectron spectroscopy (XPS). Photocatalytic degradation of methyl orange (MO) was carried out to evaluate the photocatalytic activity of Ag@AgCl under visible light irradiation. It is found that the Ag@AgCl photocatalyst shows a strong absorption in the visible region, which is attributed to the plasmon resonance of silver NPs deposited on AgCl particles. The photocatalytic reaction parameters, such as photoreduction time, dosage of catalyst and pH value were studied and optimized, and the highest activity for the degradation of methyl orange is up to 83% in 120 min under visible light irradiation. The excellent visible light photocatalytic activity can be attributed to the surface plasmon resonance effect of Ag NPs anchored on AgCl particles. The mechanism of separation of the photogenerated electrons and holes at the Ag@AgCl photocatalyst were discussed. Copyright © 2015, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved. Source


Wei H.-Y.,Hebei United University | Wei H.-Y.,CAS Shanghai Institute of Ceramics | Wei H.-Y.,Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials | Wang H.-Y.,Hebei United University | And 8 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2013

MgAl2O4 powder was synthesized via non-hydrolytic and hydrolytic sol-gel method, respectively. The phase transformation, the particle morphology and sintering properties of MgAl2O4 powders were studied by DTA-TG, XRD and FE-SEM analysis. The results showed that there existed the MgAl2O4 spinel phase with a little of periclase phase, when the hydrolytic xerogels were calcined at 900°C for 0.5 h. There only was the single-phase MgAl2O4 spinel, after the non-hydrolytic xerogels were calcined at 900°C for 0.5 h. The average powder size of MgAl2O4 spinel powders synthesized by hydrolytic and non-hydrolytic sol-gel method was 90 nm and 50 nm, respectively. When the synthesized MgAl2O4 spinel powders were sintered at 1600°C for 3 h, most crystal grain were octahedra shape and their averge size was 1-2 μm and 0.5-1 μm, respectively. For the sintered sample prepared by hydrolytic sol-gel methrod, the MgAl2O4 spinel crystal growth was better and displayed more visible growth step. Source


Wei Y.-N.,University of Science and Technology of China | Wei Y.-N.,CAS Shanghai Institute of Ceramics | Wei Y.-N.,Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials | Bu J.-L.,University of Science and Technology of China | And 9 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2015

Using the titanium tetrachloride solvated with anhydrous ethanol solution as titanium source, the polyvinylpyrrolidone (PVP) as the film-forming agent and carbon thermal reducing fertilizer, the TiN thin films were synthesized in nitrogen by carbon thermal reduction nitridation process at temperature of 1300 ℃ and soaking time for 5 h. The effect of PVP molecular weight and its dosage on microstructure of titanium nitride thin films was studied by XRD and SEM.The results show that the tendency of (111) preferred orientation decreases as PVP molecular weight increasing. When the PVP molecular weight is 1300000, TiN crystal grain size was larger, grain boundary decreases. The crack decreases in the TiN thin films when the PVP dosage according to Ti/C increases form 1:10 to 1:12, but the porosity increases when the PVP dosage increases to 1:14. The growth process model of TiN thin films is that the granular crystal nucleus of TiN gradually grows into bar structure, then grows into sheet triangle or hexagon, and the triangular file or hexagonal platform appears finally. ©, 2015, Chinese Ceramic Society. All right reserved. Source

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