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首页> 外文会议>Annual International Conference on Materials Science and Engineering >Preparation,Characterization and Visible Light Photocatalytic Activities of Samarium-Doped Mixed Crystalline Phase TiO2 Nanoparticles
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Preparation,Characterization and Visible Light Photocatalytic Activities of Samarium-Doped Mixed Crystalline Phase TiO2 Nanoparticles

机译：钐掺杂混合结晶相TiO2纳米粒子的制备，表征和可见光光催化活性

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Mixed crystalline phase TiO2 nanoparticles with different content of Sm ion were prepared by a facile sol-gel method.The samples were characterized by XRD,XPS,UV-Vis-DRS,and PL.The influence of Sm-doping on structure and visible light photocatalytic activity of mixed phase TiO2 was evaluated by photocatalytic degradation of MB under the irradiation of fluorescent lamp.The results indicate that samarium appears two kinds of Sm~(3+) and Sm~(2+) valence state on the surface of TiO2.Sm doping can restrain the phase transition from anatase to rutile,and prevent the grain growth.Appropriate amount of Sm doping and the proportions of rutile and anatase mixed phase can effectively inhibit the recombination of photo-generated electron and hole pairs,expand the wavelength range of absorption spectrum.Moreover,the photocatalytic activity of Sm-TiO2 in MB degradation is evidently enhanced.The MB degradation rate of Sm-TiO2 samples with ra(Sm):n(Ti)=0.006 is the best under the irradiation of fluorescent light when the sintered temperature T=500°C,it is 97% within 6 h,which is significantly higher than 56.4% of pure TiO2 under the same experimental conditions.
机译：通过容易溶胶 - 凝胶法制备具有不同含量的SM离子含量的混合结晶相TiO2纳米颗粒。通过XRD，XPS，UV-Vis-DRS和PL来表征样品。SM掺杂对结构和可见光的影响通过在荧光灯照射下的MB光催化降解来评估混合相TiO2的光催化活性。结果表明，钐在TiO 2表面上出现两种SM〜（3+）和SM〜（2+）价态。 SM掺杂可以抑制从锐钛酶到金红石的相转变，并防止晶粒生长。不恰当的SM掺杂量和金红石和锐钛矿混合相的比例可以有效地抑制光产生的电子和空穴对的重组，膨胀波长范围吸收光谱。显然增强了Mb降解中SM-TiO2的光催化活性。SM-TiO2样品与Ra（SM）的MB降解速率：N（Ti）= 0.006是荧光照射的最佳状态当烧结温度T = 500℃时，光源在6小时内为97％，在相同的实验条件下显着高于纯TiO2的56.4％。

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