In-situ growth of ZIF-8 on layered double hydroxide: Effect of Zn/Al molar ratios on their structural, morphological and adsorption properties
In-situ growth of ZIF-8 on layered double hydroxide: Effect of Zn/Al molar ratios on their structural, morphological and adsorption properties
复制标题
ZIF-8 在层状双氢氧化物上的原位生长：Zn/Al 摩尔比对其结构、形态和吸附性能的影响
DOI：
10.1016/j.jcis.2017.05.100
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发表时间：
2017
影响因子：
9.9
通讯作者：
Zhou Min
中科院分区：
文献类型：
--
作者：
Yang Yingli;Yan Xinlong;Hu Xiaoyan;Feng Rui;Zhou Min
在层状双氢氧化物（LDH）上原位生长沸石咪唑酯骨架（ZIF）以形成多孔复合材料是开发分离应用材料的一种有前景且具有挑战性的策略。在此，制备了不同Zn/Al摩尔比的Zn-Al LDH并用作ZIF-8在其表面生长的基质。通过 X 射线衍射 (XRD)、X 射线光电子能谱 (XPS)、N2 物理吸附、热重分析 (TG)、扫描电子显微镜 (SEM) 和元素分析对所得复合材料进行表征，然后测试水溶液中 AsV 的去除情况。结果表明，不同Zn/Al摩尔比的LDH表面均能形成ZIF-8。在低Zn/Al摩尔比下，ZIF/LDH复合材料的形貌、表面积以及复合材料中ZIF-8的含量受Zn/Al摩尔比的影响很小。随着Zn/Al摩尔比的增加，ZIF-8/LDH表现出较低的表面积，这是由于LDH基质中产生的杂质导致ZIF-8的含量减少。所有ZIF-8/LDH样品均表现出较高的AsV吸附能力，显着高于纯LDH或ZIF-8。
In-situ growth of Zeolite imidazolate frameworks (ZIFs) on layered double hydroxides (LDHs) to form porous composites is a promising and challenging strategy to develop materials for separation application. Herein, the Zn-Al LDH with different Zn/Al molar ratios was prepared and used as matrix for the growth of ZIF-8 on its surface. The resulting composites were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N2physisorption, thermogravimetric (TG), scanning electron microscope (SEM) and elemental analysis followed by testing for AsVremoval from aqueous solution. Results showed that ZIF-8 could form on the surface of LDH with different Zn/Al molar ratios. At low Zn/Al molar ratios, the morphology and surface area of the ZIF/LDH composites and the content of ZIF-8 in the composites were little affected by the Zn/Al molar ratio. With increasing Zn/Al molar ratio, ZIF-8/LDH exhibited a lower surface area, which resulted from reduced content of ZIF-8 caused by impurities generated in the LDH matrix. All ZIF-8/LDH samples showed high AsVadsorption capacity, which was significantly higher than that of pure LDH or ZIF-8.