Zheng L.,Fujian Normal University |
Zheng L.,Fujian Key Laboratory of Polymer Materials |
Yan G.,Ningde Normal University |
Yan G.,Fujian Provincial Key Laboratory of Photocatalysis |
And 5 more authors.
International Journal of Hydrogen Energy | Year: 2014
Exploration of new system which selectively removes nitrogen-containing organic compounds in petroleum by photocatalytic catalysts is of great value on enriching the foundation of photocatalytic science as well as developing photocatalytic technologies in their practical applications in gasoline fuel. In this paper, tetrabutyl titanate was used as titanium source and bismuth nitrate was utilized as the source of bismuth, and Bi20TiO32 was synthesized using ultrasonic assisted impregnation method. The samples were characterized by X-ray diffraction (XRD), N2 adsorption-desorption (BET), and X-ray photoelectron spectroscopy (XPS). To evaluate its photocatalytic denitrogenation performance, simulated gasoline feed containing a certain concentration of pyridine was used as a reference. The analysis results showed that the synthesized Bi20TiO32 was a type of tetragonal crystal system of Bi-Ti oxide in metastable phase with nanosheet at a size of about 15 nm and band gap of 2.9 eV. This system can absorb the light ranging from UV to 500 nm wavelength. Under the irradiation of visible light above 420 nm wavelength for 150 min, the conversion of pyridine by photocatalytic degradation in 50 mL simulated feed (pyridine containing 100 μg/g) using 0.05 mg the photocatalyst was up to 86.0%. The visible light removal efficiency of pyridine was directly proportional with the illumination time, and there was no noticeable oxidation degradation of the solvent. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Zheng L.,Fujian Normal University |
Lin M.,Fujian Normal University |
Huang Y.,Fujian Normal University |
Yan G.,Fujian Normal University |
And 4 more authors.
China Petroleum Processing and Petrochemical Technology | Year: 2013
The strontium modified waste FCC catalyst was prepared by magnetic stirring method and characterized by Xray diffractometry (XRD), UV-Vis diffuse reflectance spectrometry (DRS), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Meanwhile, its photocatalytic denitrogenation performance was evaluated in terms of its ability to degrade the N-containing simulation oil under visible light. A mixture of strontium nitrate solution (with a concentration of 0.5 mollL) and waste FCC catalyst was calcined at 400 0 for 5 h prior to taking part in the photocatalytic denitrogenation reaction. The test results showed that the photocatalytic degradation rate of pyridine contained in simulation oil in the presence of the strontium modified FCC catalyst could reach 92.0% under visible light irradiation for 2.5 h. waste FCC catalyst; photocatalysis; denitrogenation.
Zheng L.P.,Fujian Normal University |
Yan G.Y.,Ningde Normal University |
Yan G.Y.,Fujian Provincial Key Laboratory of Photocatalysis |
Huang Y.Y.,Fujian Normal University |
And 4 more authors.
Materials Research Innovations | Year: 2014
Bi20TiO32 was synthesised successfully by sol-gel and ultrasonic assisted surface impregnation methods using tetrabutyl titanate as titanium source and bismuth nitrate as bismuth source. The samples were characterised by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-vis diffuse reflectance spectrocopy (DRS) and so on. In order to evaluate its photocatalytic denitrogenation performance, simulate oil containing a certain concentration of pyridine was used as the target. The results showed that the synthesized Bi20TiO32 was a kind of tetragonal crystal system of Bi-Ti oxide in metastable phase, with nanosheet size of about 16 nm and band gap of 2·9 eV, which can absorb the light ranging from the UV to 500 nm wavelength. The activity of photocatalytic degradation of 0·05 mg photocatalyst on 50 mL simulated oil (pyridine containing 100 ug g-1) was up to 86·0% under the irradiation of visible light above 420 nm wavelength for 150 min. © W. S. Maney & Son Ltd. 2014.
Zheng L.-P.,Fujian Normal University |
Zheng L.-P.,Fujian Key Laboratory of Polymer Materials |
Yan G.-Y.,Ningde Normal University |
Yan G.-Y.,Fujian Provincial Key Laboratory of Photocatalysis |
And 3 more authors.
Jiegou Huaxue | Year: 2015
V-doped TiO2 nanoparticles (NPs) as dye adsorbents are synthesized by the co-precipitation method and characterized by X-ray powder diffraction, transmission electron microscope, N2 adsorption at 77 K, and X-ray photoelectron spectroscopy. The adsorption of methylene blue (MB) on the V-doped TiO2 NPs is studied in detail by varying the calcination temperature and V doping amount of the adsorbent, adsorbate concentration, adsorbent dosage, agitation rate, reaction temperature, and pH. The comparison of dye adsorption on V-doped TiO2 and parent TiO2 demonstrates that the adsorptive activity of TiO2 can be improved by V doping. The enhanced adsorptive performance can be attributed to the tremendous changes in texture, structure, and surface morphology of adsorbent. The adsorption kinetic analysis shows that the adsorption follows the pseudo-second order kinetics. The apparent activation energy for adsorption is calculated by Arrhenius formula to be 37.6 kJ·mol-1, indicating that the adsorption is controlled by both of the diffusion and interfacial adsorption steps. The adsorption data are analyzed using Langmuir and Freundlich isotherms and the results indicate that the Langmuir model provides better correlation of the experimental data. The results conclusively show that the adsorption of MB is a spontaneous behavior and endothermic reaction with the ΔH value of 17.60 kJ·mol-1. © 2015 Chinese J. Struct. Chem.