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首页> 外文期刊>ACS applied materials & interfaces >Host-Mediated Synthesis of Cobalt Aluminate/7-Alumina Nanoflakes: A Dispersible Composite Pigment with High Catalytic Activities
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Host-Mediated Synthesis of Cobalt Aluminate/7-Alumina Nanoflakes: A Dispersible Composite Pigment with High Catalytic Activities

机译：主机介导的铝酸钴/ 7-氧化铝纳米薄片的合成：具有高催化活性的分散性复合颜料

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摘要

Cobalt aluminate/γ-alumina (CoAl2O4/γ-Al2O3) nanocomposite pigment with mesoporous structure has been synthesized. The method simply involves adsorption of Co~(2+) ion on the surface of a commercially available boehmite (AlOOH) powder followed by the reaction of Co~(2+) and AlOOH at relatively low temperature (500 °C) to obtain CoAl2O4/γ-Al2O3 composite nanopowders. The formation of γ-Al2O3 from boehmite induces the in situ generation of isostructural CoAl2O4 (both crystallize as cubic spinel) at such a low temperature. The obtained intense blue powder of optimal composition (53.6 wt % CoAl2O4 in γ-Al2O3) can bedispersed in glycerol and characterized by UV-visible, X-ray diffraction, Raman spectroscopy, TEM, and nitrogen sorption analyses. Raman studies confirm the formation of CoAl2O4 phase in γ-Al2O3. TEM studies reveal the formation of flake shaped (S-10 nm in width and 10-25 nm in length) nanopowders, and these flakes are assembled to form mesoporous structure. The specific surface area, total pore volume and average pore diameter of this powder are estimated to be～118 m~2 g~(-1) 0.1375 cm~3 g~(-1), and 4.65 nm, respectively. This composite nanopowder has been used as an active catalyst for the decomposition of H2O2 at room temperature and the decomposition follows the first order kinetics with rate constant value close to 2.3 x 10~(-2) min~(-1) . This pigment nanopowder can be reused for several cycles without noticeable degradation of its original catalytic activity.
机译：合成了具有介孔结构的铝酸钴/γ-氧化铝（CoAl2O4 /γ-Al2O3）纳米复合颜料。该方法仅涉及在市售勃姆石（AlOOH）粉末表面吸附Co〜（2+）离子，然后在相对较低的温度（500°C）下使Co〜（2+）和AlOOH反应以获得CoAl2O4。 /γ-Al2O3复合纳米粉。在如此低的温度下，由勃姆石形成的γ-Al2O3诱导了同构CoAl2O4（均结晶为立方尖晶石）的原位生成。可以将获得的最佳成分的深蓝色粉末（γ-Al2O3中的53.6 wt％CoAl2O4）分散在甘油中，并通过UV-可见，X射线衍射，拉曼光谱，TEM和氮吸附分析进行表征。拉曼研究证实了γ-Al2O3中CoAl2O4相的形成。 TEM研究揭示了片状（宽度为S-10 nm，长度为10-25 nm）纳米粉的形成，这些粉被组装形成中孔结构。该粉末的比表面积，总孔体积和平均孔径估计分别为〜118m〜2g〜（-1），0.1375cm〜3g〜（-1）和4.65nm。该复合纳米粉已被用作室温下分解H2O2的活性催化剂，其分解遵循一级动力学，速率常数接近2.3 x 10〜（-2）min〜（-1）。该颜料纳米粉可以重复使用数个周期，而其原始催化活性不会明显下降。

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