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绿色超声化学辅助合成半导体Br_4O_5Br_5空心纳米壳
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摘要
采用一种超声化学反应结合煅烧处理技术,首次制备获得Br_4O_5Br_5空心纳米壳。产品采用了XRD、SEM、TEM、HRTEM、固体紫外和N2吸附脱附进行测试表征。XRD测试结果表明产品是纯单斜相Br_4O_5Br_5。SEM、TEM和HRTEM测试表明产品是空心纳米壳状,且具有富勒烯多层结构。纳米壳平均厚度为12nm左右,壳上存在介孔,孔径为2.3和6.1 nm。对空心Br_4O_5Br_5纳米壳的形成机理进行了探讨。固体紫外检测分析产品的光学带隙为2.65 eV。空心Br_4O_5Br_5纳米壳对罗丹明B具有高效的可见光催化降解活性。
Novel Bi_4O_5Br_2 hollow nanoshells have been successfully fabricated through a green ultrasound-assisted reaction combining a calcination process for the first time. The products have been characterized by XRD, SEM, TEM, HRTEM, UV-vis diffuse reflectance spectrum(DRS) and N_2 adsorption/desorption isotherms. The results reveal that the multilayered hollow nanoshells, owning inorganic fullerene-like structure, possess a pure monoclinic phase Bi_4O_5Br_2 with the average thickness of about 12 nm. The pore diameters of bimodal intercrystal mesopores are 2.3 and 6.1 nm and the band gap energies are estimated to be 2.65 eV, respectively. A possible growth mechanism for Bi_4O_5Br_2 hollow nanoshells is simply proposed. According to the photodegradation of Rhodamine B, the hollow Bi_4O_5Br_2 nanoshells exhibit highly efficient photocatalytic activity under visible light irradiation.
引文
[1]Zhu,L.Y.;Zheng,X.W.;Yin,X.;Tian X.B.Inorg.Chen.2002,41:4560.
    [2]Mao,X.M.;Xie,F.X.;Li,M.Mater.Lett.2016,166:296.
    [3]Liu,D.;Yao,W.Q.;Wang,J.;Liu,Y.F.;Zhang,M.;Zhu,Y.F.Appl.Catal.B 2015,172-173:100.

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