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首页> 外文期刊>RSC Advances >Single step hydrothermal synthesis of beyerite, CaBi2O2(CO3)(2) for the fabrication of UV-visible light photocatalyst BiOI/CaBi2O2(CO3)(2)
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Single step hydrothermal synthesis of beyerite, CaBi2O2(CO3)(2) for the fabrication of UV-visible light photocatalyst BiOI/CaBi2O2(CO3)(2)

机译：单步水热合成Beyerite，Cabi2O2（Co3）（2）用于制备UV可见光光催化剂BioI / Cabi2O2（CO3）（2）

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摘要

The mineral beyerite (CaBi2O2(CO3)(2)), a member of the "sillen" family possessing a layer sequence, (Bi2O2)(2+)-CO32--Ca2+-CO32--(Bi2O2)(2+) has successfully been synthesized under hydrothermal conditions in a single step for the first time. Uniform rectangular plates of beyerite crystallites with a surface area of 33 m(2) g(-1) were obtained by heating a solution containing bismuth nitrate and calcium carbonate in ethylene glycol along with the addition of a saturated solution of sodium carbonate at 140 degrees C. The sample was characterized by powder X-ray diffraction combined with Rietveld refinement, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, Fourier transform infrared spectra and diffuse reflectance measurements. The band gap estimated for beyerite was found to be 3.97 eV and was utilized subsequently to form heterostructure with BiOI (band gap of 1.76 eV), another member belonging to the sillen family. The formation of the composite BiOI/CaBi2O2(CO3)(2) has been confirmed by a variety of techniques and its photocatalytic properties as a UV-visible photocatalyst has been demonstrated for the degradation of aqueous solutions of rhodamine B and phenol. Photocatalytic experiments in presence of scavengers suggested the possible mechanism occurring through holes and peroxide radicals rather than the hydroxyl radicals.
机译：矿物质百叶液（Cabi2O2（Ca3）（2）），具有层序列的“Sillen”系列的成员，（Bi2O2）（2 +） - CO 32 - Ca2 + -CO32 - （Bi2O2）（2+）具有首次在一步中成功地在水热条件下合成。通过在乙二醇中加热含有硝酸铋和碳酸钙的溶液，在140度下加入含有饱和碳酸钠的碳酸钙的溶液，获得均匀的叶片微晶的叶片微晶的均匀矩形板。 C.样品的特征在于粉末X射线衍射，与RietVeld改进，扫描电子显微镜，透射电子显微镜，热重分析，傅里叶变换红外光谱和漫反射率测量组合。发现Beyerite估计的带隙是3.97eV，随后使用与Bioi（1.76eV的带隙）形成异质结构，这是属于Sillen家族的另一个成员。通过各种技术证实了复合生物/ CABI2O2（CO 3）（2）的形成，并且其光催化性能作为UV可见光催化剂已经证明了Rhodamine B和苯酚的水溶液的降解。在清除剂存在下的光催化实验表明了通过孔和过氧化物的可能机制而不是羟基自由基。

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  • 来源
    《RSC Advances》 |2016年第44期|共11页
  • 作者

    Malik Vidhu; Pokhriyal Meenakshi; Uma S.;

  • 作者单位

    Univ Delhi Dept Chem Mat Chem Grp Delhi 110007 India;

    Univ Delhi Dept Chem Mat Chem Grp Delhi 110007 India;

    Univ Delhi Dept Chem Mat Chem Grp Delhi 110007 India;

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  • 正文语种 eng
  • 中图分类 化学;
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