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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Efficient removal of methyl orange by a flower-like TiO2/MIL-101(Cr) composite nanomaterial
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Efficient removal of methyl orange by a flower-like TiO2/MIL-101(Cr) composite nanomaterial

机译：通过花状TiO2 / MIL-101（Cr）复合纳米材料有效地除去甲基橙

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Nano-scale MOF composite materials prepared by combining inorganic semiconductors with controllable pore structures and functional active sites for the effective removal of organic dyes will exhibit more excellent adsorption activity. In this paper, MIL-101(Cr) was used as a carrier and two-step hydrothermal methods were successfully used to prepare flower-like TiO2/MIL-101(Cr) composite nano-adsorbents with different sizes. The results of XRD, SEM, XPS and other characterization methods showed that when the molar ratio of Ti:Cr was 0.2:1, the composite nano-adsorbent exhibited better adsorption performance and removal efficiency for methyl orange (MO) in aqueous solution. By assembling TiO2 on MIL-101(Cr), Ti replaced part of Cr, and the positively-charged TiO2/MIL-101(Cr) nanocomposite and negatively-charged MO in aqueous solution formed a strong interaction force. In addition, the pi-pi packing interactions of the benzene ring of MIL-101(Cr) and the electrostatic force between TiO2 and MIL-101(Cr) also enhanced the performance and adsorption efficiency of the adsorbent to a certain extent. The BET results showed that the large specific surface area and average pore diameter of the TiO2/MIL-101(Cr) nanocomposites effectively improved the adsorption performance of the composites. The results showed that the MO removal efficiency of 20% TiO2/MIL-101(Cr) can reach 93.03% at 80 min. But when 20% TiO2/MIL-101(Cr) was used to adsorb 70 mg.L-1 MO, the experimental maximum adsorption capacity was 242.02 mg.g(-1).
机译：纳米尺度MOF复合材料进行混合制备具有可控孔隙结构和用于有效去除有机染料的官能活性点的无机半导体会表现出更优异的吸附活性。在本文中，MIL-101（Cr）为用作载体和两步水热法成功地用于制备花状的TiO 2 / MIL-101（Cr）的复合纳米吸附剂具有不同的尺寸。 XRD，SEM，XPS和其它表征方法的结果表明，在Ti的摩尔比：CR为0.2：1，复合纳米吸附剂显示出对在水溶液甲基橙（MO）更好的吸附性能和去除效率。通过MIL-101（Cr）的组装的TiO2，钛替换部分的Cr，和带正电的TiO 2 / MIL-101（Cr）的纳米复合物和带负电荷的MO在水溶液中形成了较强的相互作用力。另外，π-π包装MIL-101（Cr）构成的苯环的相互作用和TiO2和MIL-101（Cr）的之间的静电力也增强了吸附剂的性能和吸附效率在一定程度上。的BET结果表明，大的比表面积和在TiO 2 / MIL-101（Cr）的平均细孔径纳米复合材料有效地改善了复合材料的吸附性能。结果表明的MO去除率20％的TiO 2 / MIL-101（Cr）的可在80分钟达到93.03％。但是，当20％的TiO 2 / MIL-101（CR）被用来吸附70 mg.L-1 MO，实验最大吸附容量为242.02 mg.g（-1）。

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