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首页> 外文期刊>Crystal growth & design >Facile hydrothermal synthesis of hierarchical boehmite: Sulfate-mediated transformation from nanoflakes to hollow microspheres
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Facile hydrothermal synthesis of hierarchical boehmite: Sulfate-mediated transformation from nanoflakes to hollow microspheres

机译：分级勃姆石的简便水热合成：硫酸盐介导的从纳米薄片到空心微球的转变

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An interesting morphological evolution from single nanoflakes to nanoflake assemblies, flower-like structures, and hollow microspheres is reported for the first time for boehmite prepared from Al(NO_3)_3· 9H_2O with addition of urea and different amounts of KAl(SO _4)_2·12H_2O under hydrothermal conditions. The microstructure, morphology, and textural properties of the boehmite materials were characterized by X-ray powder diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption. It was found that the resulting hierarchical boehmite materials composed of nanoflakes were transformed from featureless material to irregular particles and solid microspheres. To better understand this transformation, different sulfate additives-AlNH _4(SO_4)_2·12H_2O, Al _2(SO_4)_3·18H_2O, Na _2SO_4, (NH_4)_2SO_4, and MgSO_4·7H_2O-were used to synthesize boehmite and magnesia-incorporated boehmite hollow microspheres. This study shows that the sulfate-mediated transformation strategy can be extended for the preparation of other hierarchical metal oxides with controlled morphological and textural properties for catalysis, adsorption, and separation applications.
机译：首次报道了由Al（NO_3）_3·9H_2O加尿素和不同量的KAl（SO _4）_2制备的勃姆石从单纳米薄片到纳米薄片组件，花状结构和中空微球的有趣形态演变。 ·12H_2O在水热条件下。通过X射线粉末衍射，傅立叶变换红外光谱，扫描电子显微镜，透射电子显微镜和氮吸附来表征勃姆石材料的微观结构，形态和结构特性。结果发现，由纳米薄片组成的分层勃姆石材料从无特征的材料转变为不规则的颗粒和固体微球。为了更好地理解这种转变，使用了不同的硫酸盐添加剂-AlNH _4（SO_4）_2·12H_2O，Al _2（SO_4）_3·18H_2O，Na _2SO_4，（NH_4）_2SO_4和MgSO_4·7H_2O-合成勃姆石和镁砂勃姆石空心微球。这项研究表明，硫酸盐介导的转化策略可以扩展到制备其他具有控制的形态和质地特性的金属氧化物，用于催化，吸附和分离应用。

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