Yulin Teachers College

Yulin, China

Yulin Teachers College

Yulin, China

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Lan Y.,Guangxi University | Lan Y.,CAS Institute of Semiconductors | Zhou L.,Guangxi University | Zhou L.,CAS Institute of Semiconductors | And 4 more authors.
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2011

The highly ordered and uniform TiO2 nanotube arrays were fabricated by anodic oxidation in aqueous solution. The effects of rare earth-doping and dye-sensitization on the photovoltaic properties of the TiO2 nanotube arrays were studied. These TiO2 samples were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), UV-Vis absorption spectroscope (UV-Vis), fluorescence spectroscope (FS), and the photovoltaic properties were investigated. The results showed that the modification of rare-earth doping improved the photovoltaic properties of TiO2 nanotube arrays. The highest power conversion efficiency and filling factor of Y3+/TiO2 nanotube arrays achieved 0.92% and 0.59 respectively, and the dye-sensitization enhanced the power conversion efficiency of Y3+/TiO2 nanotube arrays by 3.2 times.


Xie Z.-F.,Yulin Teachers College | Liu G.-C.,Guangxi University | Tong Z.-F.,Guangxi University | Tong Z.-F.,Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2012

The adsorption properties of 2,4-dihydroxybenzoic acid by 717 (gel-type, strong base), D201 (macroporous-type, strong base) and D301R (macroporous-type, weak base) resins were studied through static and dynamic experiments. The results show that the maximum adsorption ability of 717 and D201 resins occurs at pH=4~11, and D301R resin at pH=3~9. At pH=5, 293~313 K and initial concentration of 2,4-dihydroxybenzoic acid of 0.6488~6.488 mmol/L, the adsorption isotherms of 2,4-dihydroxybenzoic acid on D301R, 717 and D201 resins obey Freundlich model, and their maximum equilibrium adsorption capacity is 2.98, 2.66 and 2.54 mmol/g, respectively (the adsorption has not reached saturation yet). The adsorptions are physical and spontaneous, exothermal processes. Pseudo first-order and pseudo second-order models were applied to correlate the kinetic experimental data. The former was more accordant with the experimental data than the latter. The 2,4-dihydroxybenzoic acid adsorbed on the three resins could be eluted by 100 mL 5%(ω) NaCl+2%(ω) NaOH solution quickly with elution rate reaching 99%. The adsorption performance of 2,4-dihydroxybenzoic acid on D301R resin was better than on that on D201 and 717 resins under the same conditions.


Xie Z.-F.,Yulin Teachers College | Tong Z.-F.,Guangxi University | Tong Z.-F.,Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology | Chen Y.,Yulin Teachers College | And 2 more authors.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2014

The adsorption equilibrium of picric acid and 2,4-dinitrophenol onto D301R resin in aqueous solutions was studied by static method, as well as the effect of resin content, temperature and adsorbent mass concentration on the adsorption, and the characteristics of isotherm adsorption. The experimental results show that in a single solute system, the adsorption of picric acid or the 2,4-dinitrophenol decreases with the increase of the resin amount, and increases with temperature rise, which is an endothermic process. The adsorption of picric acid and 2,4-dinitrophenol by D301R resin in a single solute system obeys the Freundlich isotherm at equilibrium mass concentration of 1-350 mg/L. However in a binary solute system, the adsorption of picric acid shows a maximum with the increase of resin content, while the adsorption of 2,4-dinitrophenol is essentially the same as that of single solute. The isotherm adsorption of binary solute indicates that once the isotherm of 2,4-dinitrophenol passes a turning point, the afterward adsorption rises sharply. Unlike in the case of a single solute system, the adsorption of picric acid declines after reaching a maximum at the isotherms. The adsorptive characteristics of the picric acid and the 2,4-dinitrophenol in binary systems present a varying degree of competitive adsorption.


He X.,Guangxi University | Huang J.,Guangxi University | Zhou L.,Guangxi University | Pang Q.,Yulin Teachers College | Gong F.,Guangxi University
Central European Journal of Physics | Year: 2012

A series of new red phosphors, MZr 2(PO 4) 3:Eu 3+; Bi 3+ (M=Na; K), were synthesized using the solidstate reaction method, and their photoluminescence spectra were measured. The MZr 2(PO 4) 3:Eu 3+; Bi 3+ (M=Na; K) phosphors were efficiently excited by an ultraviolet (UV; 395 nm) source, and showed intense orange-red emission at 595 nm. Further investigation of the concentration-dependent emission spectra indicated that the MZr 2(PO 4) 3:Eu 3+; Bi 3+ (M=Na; K) phosphors exhibit the strongest luminescence intensity when y = 0. 01 in NaZr 2(0:95-y)(PO 4) 3:Eu 0. 10 3+, Bi 2y 3+ and y = 0. 09 in NaZr 2(0. 95-y)(PO 4) 3:Eu 0. 10 3+, Bi 2y 3+, whereas the relative PL intensity decreases with increasing Bi 3+ concentration due to concentration quenching. The addition of Bi 3+ widens the excitation band of NaZr 2(0. 95-y)(PO 4) 3:Eu 0. 10 3+, Bi 2y 3+ around 320 nm, which provides the useful idea of broadening the excitation band around 300-350 nm to fit the ultraviolet chip. © 2012 Versita Warsaw and Springer-Verlag Wien.


Xie Z.-F.,Yulin Teachers College | Chen Y.,Yulin Teachers College | Yan Q.,Yulin Teachers College | Tong Z.-F.,Guangxi University | Yang K.-Q.,Yulin Teachers College
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2011

The coadsorption behavior and selectivity of salicylic acid and sulfosalicylic acid from aqueous solution on D201 resin were studied by using static and dynamic methods. The experimental results of the simultaneously competitive adsorption, preloading competitive adsorption and isotherm adsorption processes indicate that salicylic acid has very little influence on D201 resin adsorption of the sulfosalicylic acid, but the latter significantly depresses the adsorption of the salicylic acid. The predominant mechanism attributes to the competition of salicylic acid and sulfosalicylic acid for adsorption sites. In the binary solution of salicylic acid and sulfosalicylic acid (mass concentration ratio of 1:1), the initial mass concentration can significantly affect the adsorption selectivity of D201 resin. At an initial mass concentration less than 500 mg/L, D201 resin shows almost no adsorption to either salicylic acid or sulfosalicylic acid. However, at initial mass concentrations of 1000-2000 mg/L, D201 resin can essentially absorb the sulfosalicylic acid with high selectivity, which can easily separate sulfosalicylic acid from the binary solution. The dynamic adsorption and desorption of 1.000 g D201 resin for the binary solution of salicylic acid and sulfosalicylic acid with the initial mass concentrations of 2000 mg/L show a clear substitution crest in the effluent curve of salicylic acid in the exit adsorption water of 250 mL. The acids adsorbed in the resin can be quickly eluted by 5% NaCl+2% NaOH solution (mass fraction) at room temperature. The separation coefficient of sulfosalicylic acid vs salicylic acid is 300, and the recovery yield of sulfosalicylic acid is 96%. This investigation demonstrates that D201 resin can be successfully applied to separate salicylic acid and sulfosalicylic acid in aqueous solution.


Lan Y.-W.,Guangxi University | Lan Y.-W.,CAS Institute of Semiconductors | Zhou L.-Y.,Guangxi University | Zhou L.-Y.,CAS Institute of Semiconductors | And 5 more authors.
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2011

The highly ordered and uniform TiO2 nanotube arrays were fabricated by anodic oxidation of titanium foil in ethylene glycol solution containing NH4F. The diameter, density, length and wall thickness of the prepared nanotube arrays can be controlled effectively by varying the anodization parameters. The microstructures and morphologies of the fabricated TiO2 nanotube were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD), and its photocatalytic properties were investigated via the degradation of methyl orange. The results show that the highly ordered and uniform TiO2 nanotube arrays could be grown under the conditions optimized by authors. Using the prepared TiO2 nanotube arrays as photocatalyst and after 40 min illumination of the high voltage mercury lamp (500 W), the degradation ratio of methyl orange in its aqueous solution with concentratin of 20 mg·L-1 can reach 99.4% when the solution pH value is 2.0. And it was found that the photocatalysis of TiO2 nanotube can be improved by adding H2O2 into the solution.


Xie Z.-F.,Yulin Teachers College | Tong Z.-F.,Guangxi University | Chen Y.,Yulin Teachers College | Yan Q.,Yulin Teachers College | And 2 more authors.
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2011

The anion exchange resin 717 was used to selectively adsorb and separate the salicylic acid and phenol from their binary aqueous solution. The adsorption behavior of 717 resin for each adsorbate was studied via both dynamic and static methods. The effects of pH value, adsorbate concentration and adsorption time on the adsorption process were investigated, and the isotherm adsorption and adsorption kinetics were also studied. The experimental results show that the pH value of the solution plays the most important role in the adsorption and separation process. At pH of 4.5, the existence of phenol in the solution essentially does not affect the salicylic acid adsorption of the 717 resin, while when the pH is 11, the phenol can be adsorbed by 717 resin to substitute the adsorbed salicylic acid on it, which substantially decreases the salicylic acid adsorption capacity of the resin. In the pH range of 4 ~8, the 717 resin has very high selective adsorption ability and adsorption capacity for the salicylic acid, and its adsorption capacity for salicylic acid is more than an order of magnitude larger than that for the phenol. With such high adsorption selectivity, the 717 resin is favorable to be used for the separation salicylic acid from the binary aqueous solution of salicylic acid and phenol. The static adsorptions show that the adsorptions of salicylic acid and phenol by 717 resin are in accordance with Freundlich isotherm model, and the adsorption kinetics data fit well with the Lagergren pseudo-first order rate equation. Dynamic adsorption of the mixed binary aqueous solution of salicylic acid and phenol by 717 resin shows that, in a column with resin of 1.5 g, the first 475 mL of the exit water after adsorption contains essentially only the phenol because almost all the salicylic acid are adsorbed by the resin. It was found that the salicylic acid adsorbed on the resin can be easily eluted by the 5%NaCl+2%NaOH solution at room temperature.


Luo B.,Yulin Teachers College | Luo B.,East China Normal University | Hang C.,East China Normal University | Li H.-J.,Zhejiang Normal University | And 2 more authors.
Chinese Physics B | Year: 2010

We study the ultraslow optical solitons in a resonant three-level atomic system via electromagnetically induced transparency under a density-matrix (DM) approach. The results of linear and nonlinear optical properties are compared with those obtained by using an amplitude variable (AV) approach. It is found that the results for both approaches are the same in the linear regime if the corresponding relations between the population-coherence decay rates in the DM approach and the energy-level decay rates in the AV approach are appropriately imposed. However, in the nonlinear regime there is a small difference for the self-phase modulation coefficient of the nonlinear Schrödinger equation that governs the time evolution of probe pulse envelope. All analytical predicts are checked by numerical simulations. © 2010 Chinese Physical Society and IOP Publishing Ltd.

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