Synthesis of Cu-Doped Mixed-Phase TiO2 with the Assistance of Ionic Liquid by Atmospheric-Pressure Cold Plasma |
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| Affiliation: | 1. College of Physical Science and Technology, Dalian University, Dalian 116622, China;2. College of Physical Science and Technology, Dalian University, Dalian 116622, China;Key Laboratory for Non-traditional & Functional Materials Preparation of Education Department of Liaoning Province, Dalian University, Dalian 116622, China |
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| Abstract: | An atmospheric-pressure dielectric barrier discharge (DBD) gas-liquid cold plasma was employed to synthesize Cu-doped TiO2 nanoparticles in an aqueous solution with the assistance of C2MIM]BF4 ionic liquid (IL) and using air as the working gas.The influences of the discharge voltage,IL and the amount of copper nitrite were investigated.X-ray diffraction,N2 adsorption-desorption measurements and UV-Vis spectroscopy were adopted to characterize the samples.The results showed that the specific surface area of TiO2 was promoted with Cu-doping (from 57.6 m2·g-1 to 106.2 m2·g-1 with 3％ Cu-doping),and the content of anatase was increased.Besides,the band gap energy of TiO2 with Cu-doping decreased according to the UV-Vis spectroscopy test.The 3％Cu-IL-TiO2 samples showed the highest efficiency in degrading methylene blue (MB) dye solutions under simulated sunlight with an apparent rate constant of 0.0223 min-1,which was 1.2 times higher than that of non-doped samples.According to the characterization results,the reasons for the high photocatalytic activity were discussed. |
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| Keywords: | dielectric barrier discharge (DBD) gas-liquid cold plasma atmospheric pressure mixed-phase TiO2 Cu-doped |
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