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首页> 外文期刊>ACS Omega >Preparation and Characterization of Cationic Water-Soluble Pillar[5]arene-Modified Zeolite for Adsorption of Methyl Orange
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Preparation and Characterization of Cationic Water-Soluble Pillar[5]arene-Modified Zeolite for Adsorption of Methyl Orange

机译：阳离子水溶性柱[5]芳烃改性沸石吸附甲基橙的制备与表征

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A novel quaternary cationic pillar[5]arene-modified zeolite (WPA5/zeolite) was prepared via charge interaction between the cationic WPA5 and natural zeolite and characterized by scanning electron microscopy (SEM), Fourier transform infrared absorption spectroscopy, X-ray diffraction, solid-state nuclear magnetic resonance, and thermogravimetric (TG) analysis. The effects of zeolite particle size, WPA5 concentration, adsorption time, initial concentration, and pH on the removal of methyl orange (MO) were studied. The SEM and XRD results revealed a strong interaction between WPA5 and natural zeolite, and the modified composites showed novel microscopic morphology and structural properties. TG analysis indicated excellent thermal stability of the composite. MO was removed via electrostatic adsorption, and the removal efficiency was 84% at an initial concentration of 100 mg/L. Increase in the initial dye concentration enhanced the adsorption capacity of WPA5/zeolite and decreased the removal of MO. Based on the adsorption kinetics, the pseudo-second-order model (R2 = 0.998) described the kinetic behavior of MO on WPA5/zeolite. In addition, UV and fluorescence spectra revealed that MO and WPA5 are complexed by a 1:1 complex ratio, and the binding constant between them was 12?595 L·mol–1. NMR and molecular docking also verified their interaction. Therefore, the potential application of the prepared composite includes removal of organic anionic dyes.
机译：通过阳离子WPA5与天然沸石之间的电荷相互作用，制备了一种新型的季阳离子柱[5]芳烃改性沸石（WPA5 /沸石），并通过扫描电子显微镜（SEM），傅里叶变换红外吸收光谱，X射线衍射，固态核磁共振和热重分析（TG）。研究了沸石粒度，WPA5浓度，吸附时间，初始浓度和pH对去除甲基橙（MO）的影响。 SEM和XRD结果表明WPA5与天然沸石之间有很强的相互作用，并且改性的复合材料表现出新颖的微观形态和结构性质。 TG分析表明该复合材料具有优异的热稳定性。通过静电吸附去除MO，并且在100 mg / L的初始浓度下去除效率为84％。初始染料浓度的增加增强了WPA5 /沸石的吸附能力，并降低了MO的去除。基于吸附动力学，拟二级模型（R2 = 0.998）描述了MO在WPA5 /沸石上的动力学行为。另外，紫外和荧光光谱表明，MO和WPA5以1：1的配合比复合，它们之间的结合常数为12？595 L·mol-1。 NMR和分子对接也验证了它们的相互作用。因此，制备的复合材料的潜在应用包括去除有机阴离子染料。

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