Synthesis and characterization of imidazolium based ionic liquid modified montmorillonite for the adsorption of Orange II dye: Effect of chain length

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Structure Pub Date : 2022-02-05 DOI:10.1016/j.molstruc.2021.131628

Mesut Yılmazoğlu , Büşra Turan , Pelin Demircivi , Jülide Hızal

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引用次数: 12

Abstract

In this study, two different imidazole-based ionic liquids (ILs) with different alkyl chain lengths were synthesized and modification of montmorillonite (MMT) clay was performed by using these ILs [N-methylimidazolium tetrafluoroborate (MIM) and N-butylimidazolium tetrafluoroborate (BIM)]. The adsorption efficiency of the IL modified MMT clays for removal of Orange II (O-II) anionic dye from aqueous solutions was studied systematically. MMT and IL modified MMT samples (MIM-MMT and BIM-MMT) were characterized by FTIR, SEM, TGA, DTG and XRD analysis. In addition, surface area, particle size and zeta potential measurements were carried out for prediction of adsorption ability. The specific surface areas of IL modified adsorbents were rather high (88.2 and 80.9 m² g⁻¹ for MIM-MMT and BIM-MMT respectively) comparing pristine MMT (53.6 m² g⁻¹). Batch studies were materialized to analyze the effect of different parameter on O-II adsorption, such as pH, contact time, solid/liquid ratio and temperature. Maximum adsorption capacities were obtained at pH 2 and the kinetic data revealed that O-II adsorption was greatest defined by pseudo-second order kinetic model. The adsorption capacities were found as 1.26 mg g⁻¹ (75%), 2.29 mg g⁻¹ (90%) and 1.70 mg g⁻¹ (84%) at pH 2 for MMT, MIM-MMT and BIM-MMT, respectively. Also, isotherm data were well described Freundlich isotherm model. The thermodynamic data showed that the O-II adsorption occurred endothermic and spontaneously nature. As a result of the adsorption processes, it was observed that MIM-MMT sample with short alkyl chain length can be an alternative as an effective, innovative and cheap adsorbent for removal of harmful O-II dye pollutants.

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咪唑基离子液体改性蒙脱土吸附橙Ⅱ染料的合成与表征：链长的影响

本研究合成了两种不同烷基链长度的咪唑基离子液体(ILs)，并利用这两种离子液体[n -甲基咪唑四氟硼酸盐(MIM)和n -丁基咪唑四氟硼酸盐(BIM)]对蒙脱土(MMT)粘土进行了改性。系统研究了IL改性MMT粘土对水溶液中橙二(O-II)阴离子染料的吸附效果。采用红外光谱(FTIR)、扫描电镜(SEM)、热重分析(TGA)、热重分析(DTG)和x射线衍射(XRD)对MMT和IL修饰的MMT样品(MIM-MMT和BIM-MMT)进行了表征。此外，还通过表面积、粒径和zeta电位的测定来预测吸附能力。与原始的MMT (53.6 m2 g−1)相比，IL改性吸附剂的比表面积(MIM-MMT和BIM-MMT分别为88.2和80.9 m2 g−1)相当高。通过批量研究，分析了pH、接触时间、料液比和温度等不同参数对O-II吸附的影响。在pH为2时吸附量最大，动力学数据表明，准二级动力学模型定义的O-II吸附量最大。在pH 2条件下，MMT、MIM-MMT和BIM-MMT的吸附量分别为1.26 mg g−1(75%)、2.29 mg g−1(90%)和1.70 mg g−1(84%)。Freundlich等温线模型也很好地描述了等温线数据。热力学数据表明，O-II的吸附是吸热自发的。结果表明，具有短烷基链长度的MIM-MMT样品可作为一种有效、创新和廉价的吸附剂用于去除有害的O-II染料污染物。

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.