Synthesis and characterization of clay composites with Zeolitic imidazolate framework for application as an herbicide adsorbent

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2025-07-03 DOI:10.1016/j.clay.2025.107926

Tainara C. Assis , Bluma G. Soares , Luiz C. Bertolino

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引用次数: 0

Abstract

Glyphosate is one of the most widely used herbicides globally; however, its extensive application is linked to environmental contamination and the onset of various human diseases. Therefore, developing effective strategies to remove glyphosate (GLY) from aqueous effluents in crucial. Zeolitic imidazole frameworks (ZIFs), a subclass of metal-organic framework (MOF) formed with imidazole ligands, closely resemble natural zeolites in structure. Their unique textural properties make them suitable candidates as adsorbents. In this study, a Cu (II)-based ZIF was synthesized in the presence of clay minerals, specifically palygorskite (PAL) and Na⁺ montmorillonite (CloNa), and its adsorption efficiency for GLY was evaluated. The CloNa/Cu-MOF hybrid demonstrated the highest GLY adsorption efficiency among the materials tested, reaching a value of 63 mg g⁻¹ at pH 4, 25 °C, and an initial GLY concentration of 500 mg L⁻¹. This high efficiency was attributed to the improved textural properties, thermal stability, and stability in aqueous media of CloNa/Cu-MOF hybrid. GLY adsorption followed the pseudo-second-order kinetic model, and the isotherm study revealed a favorable adsorption profile, with the best fit to the Langmuir model. Q_max values ranged from 20.04 to 277.77 mg g⁻¹ for the different studied temperatures. The thermodynamic analysis confirmed that the adsorption process is endothermic and occurs spontaneously.

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咪唑酸分子筛骨架粘土复合材料的合成与表征

草甘膦是全球使用最广泛的除草剂之一；然而，它的广泛应用与环境污染和各种人类疾病的发生有关。因此，制定有效的策略来去除水中的草甘膦（GLY）至关重要。沸石型咪唑骨架（ZIFs）是由咪唑配体形成的金属有机骨架（MOF）的一个亚类，其结构与天然沸石非常相似。它们独特的结构特性使它们成为吸附剂的合适人选。本研究在粘土矿物（PAL）和Na+蒙脱土（CloNa）存在的情况下合成了Cu （II）基ZIF，并对其吸附GLY的效率进行了评价。CloNa/Cu-MOF复合材料对GLY的吸附效率最高，在pH为4、25℃条件下，GLY的初始浓度为500 mg L−1，吸附效率为63 mg g−1。这种高效率是由于CloNa/Cu-MOF杂化材料的结构性能、热稳定性和在水介质中的稳定性得到了改善。GLY吸附符合拟二级动力学模型，等温线研究显示吸附曲线较好，最符合Langmuir模型。在不同温度下，Qmax值为20.04 ~ 277.77 mg g−1。热力学分析证实吸附过程是吸热自发发生的。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...