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首页> 外文期刊>Chemistry: A European journal >Crystal-facet engineering of ferric giniite by using ionic-liquid precursors and their enhanced photocatalytic performances under visible-light irradiation
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Crystal-facet engineering of ferric giniite by using ionic-liquid precursors and their enhanced photocatalytic performances under visible-light irradiation

机译：离子液体前驱体制备三水铁矿的晶面工程及其在可见光下的增强光催化性能

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In the work presented here, well-dispersed ferric giniite microcrystals with controlled sizes and shapes are solvothermally synthesized from ionic-liquid precursors by using 1-n-butyl-3-methylimidazolium dihydrogenphosphate ([Bmim][H_2PO_4]) as phosphate source. The success of this synthesis relies on the concentration and composition of the ionic-liquid precursors. By adjusting the molar ratios of Fe(NO _3)_3×9H_2O to [Bmim][H_2PO _4] as well as the composition of ionic-liquid precursors, we obtained uniform microstructures such as bipyramids exposing {111} facets, plates exposing {001} facets, hollow spheres, tetragonal hexadecahedron exposing {441} and {111} facets, and truncated bipyamids with carved {001} facets. The crystalline structure of the ferric giniite microcrystals is disclosed by various characterization techniques. It was revealed that [Bmim][H 2PO4] played an important role in stabilizing the {111} facets of ferric giniite crystals, leading to the different morphologies in the presence of ionic-liquid precursors with different compositions. Furthermore, since these ferric giniite crystals were characterized by different facets, they could serve as model Fenton-like catalysts to uncover the correlation between the surface and the catalytic performance for the photodegradation of organic dyes under visible-light irradiation. Our measurements indicate that the photocatalytic activity of as-prepared Fenton-like catalysts is highly dependent on the exposed facets, and the surface area has essentially no obvious effect on the photocatalytic degradation of organic dyes in the present study. It is highly expected that these findings are useful in understanding the photocatalytic activity of Fenton-like catalysts with different morphologies, and suggest a promising new strategy for crystal-facet engineering of photocatalysts for wastewater treatment based on heterogeneous Fenton-like process.
机译：在本文介绍的工作中，通过使用1-正丁基-3-甲基咪唑鎓磷酸二氢盐（[Bmim] [H_2PO_4]）作为磷酸盐源，从离子液体前体溶剂热合成尺寸和形状受控的分散良好的三水铁水菱铁矿微晶。该合成的成功取决于离子液体前体的浓度和组成。通过调节Fe（NO _3）_3×9H_2​​O与[Bmim] [H_2PO _4]的摩尔比以及离子液体前体的组成，我们获得了均匀的微观结构，如暴露{111}面的双锥体，暴露{001的板） }刻面，空心球体，暴露{441}和{111}刻面的四边形十六面体，以及带有雕刻的{001}刻面的截短的双附子。通过各种表征技术公开了三水铁镍矿微晶的晶体结构。结果表明，[Bmim] [H 2PO4]在稳定菱铁矿晶体的{111}面中起着重要作用，导致在离子液体前体存在不同组成的情况下形成不同的形貌。此外，由于这些三菱铁矿晶体具有不同的刻面特征，因此它们可以用作芬顿样催化剂，以揭示表面和可见光照射下有机染料的光降解催化性能之间的关系。我们的测量结果表明，制备的Fenton状催化剂的光催化活性高度依赖于暴露的小平面，在本研究中，表面积对有机染料的光催化降解基本上没有明显影响。高度期望这些发现有助于理解具有不同形态的类Fenton催化剂的光催化活性，并为基于异质类Fenton工艺的废水处理光催化剂的晶面工程化提出了一种有前途的新策略。

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