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Dai G.,Hubei University of Arts and Science | Dai G.,Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices | Lu P.,Hubei University of Arts and Science | Liang Y.,Hubei University of Arts and Science | Lei Y.,Hubei University of Arts and Science
Journal of the Chinese Chemical Society | Year: 2013

Co3O4/graphene oxide (GO) nanocomposites were successfully prepared by a depositing-decomposition method. The as-prepared samples were characterized by scanning electron microscopy (SEM) and Raman spectroscopy. Cyclic voltammetry (CV) was used to evaluate the electrochemical response of a glass carbon electrode (GCE) modified with Co3O 4/GO nanocomposite towards glucose. Compared with the Co 3O4/GCE, the Co3O4/GO/GCE exihibits higher electrocatalytic activity due to the synergistic effects of electrocatalytic ability of Co3O4 and large surface of GO. The Co3O4/GO/GCE was applied for glucose detection in alkaline solution. The linear current response range of glucose on Co 3O4/GO/GCE covered the range from 9 × 10-5 to 6.03 ×10-3 M, with a detection limit of 5.2 × 10-7 M (S/N = 3). © 2013 The Chemical Society Located in Taipei & Wiley-VCH Verlag GmbH & Co. KGaA,Weinheim. Source


Dai G.,Hubei University of Arts and Science | Dai G.,Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices | Liu S.,Hubei University of Arts and Science | Liu S.,Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices | Liang Y.,Hubei University of Arts and Science
Journal of Alloys and Compounds | Year: 2014

Carbon doped bismuth oxide (Bi2O3) with a porous structure is obtained by a simply calcination of bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) in glycol solution. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and UV-Vis absorption spectroscopy. The photocatalytic activity was evaluated by the photocatalytic degradation of methyl orange (MO) in an aqueous solution under visible-light radiation (λ > 420 nm). The results show that carbon was incorporated into the lattice of Bi2O3. The absorption intensity of C-doped Bi2O3 increases in the region of 450-530 nm and the absorption edge has an obvious shift to long wavelength. The C-doped Bi2O3 exhibited much higher photocatalytic activity than the pure one due to the synergetic effects of the porous structure and the improved absorption in the visible-light region. © 2014 Elsevier B.V. All rights reserved. Source


Dai G.,Hubei University of Arts and Science | Dai G.,Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices | Li S.,Hubei University of Arts and Science | Liu S.,Hubei University of Arts and Science | And 3 more authors.
Journal of the Chinese Chemical Society | Year: 2015

The surface modification of Ag/Ag2CO3 with Fe(III) ions has been achieved through simply photoreduction-impregnation method. The obtained products were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and UV-vis absorption spectroscopy. Under visible-light irradiation (γ>420 nm), the Fe(III)/Ag/Ag2CO3 sample displays a higher photocatalytic activity and stability than pure Ag2CO3 and Ag/Ag2CO3 samples for the degradation of methyl orange (MO). The improved photocatalytic activity and stability of this ternary system could be ascribed to the synergetic effect between Ag nanoparticles and Fe(III) nanocluster. The metallic Ag nanoparticles cause an obviously enhanced visible-light absorption to produce more photogenerated charges, while the Fe(III) works as an active site for the following oxygen reduction to reduce the recombination rate of photogenerated electrons and holes. The visible-light photocatalytic activity and stability of Ag2CO3 is improved by the loading of Ag and Fe(III) due to the synergistic effect of Ag nanoparticles and Fe(III) clusters. Copyright © 2015 The Chemical Society Located in Taipei & Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany. Source


Liu S.,Hubei University of Arts and Science | Liu S.,Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices | Tu Y.,Hubei University of Arts and Science | Dai G.,Hubei University of Arts and Science | Dai G.,Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices
Ceramics International | Year: 2014

Flower-like Bi2O2CO3 was synthesized in an aqueous solution containing bismuth nitrate, citric acid and urea. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, N2 adsorption-desorption and UV-visible diffuse reflectance spectroscopy. The photocatalytic activity was evaluated by the photocatalytic degradation of methyl orange in an aqueous solution under Xe lamp irradiation. The effects of citrate ion on the morphology and photocatalytic activity were investigated. The results show that citrate ions facilitate the formation of hierarchical flower-like Bi2O2CO3 microsphere. The amount of citric acid is an important parameter to control the morphology and size of Bi2O2CO3 microsphere. The flower-like Bi2O2CO3 exhibited an enhanced photocatalytic activity than Bi2O2CO3 blocks. The highest photocatalytic performance can be achieved for the Bi 2O2CO3 microspheres synthesized in the solution with the C6H8O7/Bi(NO3)3 M ratio of 2:1 due to the synergic effects of several factors, including its better crystallinity, larger surface area, stronger UV-visible absorption and unique hierarchical microsphere structure. © 2013 Elsevier Ltd and Techna Group S.r.l. Source


Dai G.,Hubei University of Arts and Science | Dai G.,Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices | Liu S.,Hubei University of Arts and Science | Liu S.,Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices | And 2 more authors.
RSC Advances | Year: 2014

Nano-sized Ag2CO3 and reduced graphene oxide (RGO) composites were fabricated by a facile chemical precipitation approach in N,N-dimethylformamide (DMF) solvent. The as-prepared Ag2CO 3/RGO nanocomposites were characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy (DRS). The photocatalytic activity of the samples was evaluated by photocatalytic degradation of methyl orange (MO) under visible light irradiation. The results showed that the nano-sized Ag2CO3 particles are deposited on the surfaces of RGO. The Ag2CO3/RGO nanocomposites exhibited much higher photocatalytic activity than the pure nano-sized Ag 2CO3 due to the improved separation efficiency of photogenerated carriers, and Ag2CO3/2 wt% RGO displayed the highest photocatalytic degradation efficiency. Furthermore, the photocatalytic and structural stability of Ag2CO3 is greatly enhanced due to the good electron transfer of RGO. This journal is © the Partner Organisations 2014. Source

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