pH-Responsive Pullulan Based Adsorbent Functionalized by Poly(N-vinylimidazole): Synthesis, Characterization and Dye Removal Application

IF 0.5 4区化学 Q4 CHEMISTRY, ANALYTICAL

Journal of Water Chemistry and Technology Pub Date : 2024-09-26 DOI:10.3103/S1063455X24050084

Marjan Hezarkhani, Selma Ustürk, Cahit Özbilenler, Elvan Yilmaz

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Abstract

In this study, a pullulan hydrogel is grafted by poly(N-vinylimidazole) (PNVI) in a heterogeneous acidic medium under a nitrogen atmosphere for Methyl Orange (MO) and Acid Green 25 (AG25) dye removal application. The effect of monomer concentration as a significant parameter for grafting yield is investigated thoroughly, and it is demonstrated that 189% grafting yield of PNVI grafted onto epichlorohydrin crosslinked pullulan (pullulan-ECH-graft-PNVI) can be obtained under proper conditions. Equilibrium water absorption capacity values reveal the pH-responsivity of pullulan-ECH-graft-PNVI hydrogels (6000%) as compared to the epichlorohydrin crosslinked pullulan (pullulan-ECH) hydrogel (1000%) counterpart. Further characterization of the samples was performed by Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and X-ray diffraction (XRD). Adsorption of MO and AG25 on pullulan-ECH-graft-PNVI samples was studied at various pH, dye concentration, and time. The optimal adsorption pH value was measured at pH 3.0 with an adsorption capacity of 36.6 mg MO/g adsorbent and 5.72 mg AG25/g adsorbent. Isotherms and kinetic studies describe the adsorption profiles of the samples. The adsorption trends of the samples best fit the Freundlich model, which supports heterolayer dye adsorption and surface heterogeneity. Adsorption kinetic results indicate a pseudo-second-order kinetic model, which shows chemisorption.

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由聚（N-乙烯基咪唑）功能化的具有 pH 响应性的普鲁兰基吸附剂：合成、表征和染料去除应用

本研究在氮气环境下的异相酸性介质中，用聚（N-乙烯基咪唑）（PNVI）接枝了一种拉普兰水凝胶，用于去除甲基橙（MO）和酸性绿 25（AG25）染料。研究深入探讨了单体浓度这一重要参数对接枝率的影响，结果表明，在适当条件下，PNVI 接枝到环氧氯丙烷交联的 pullulan（pullulan-ECH-graft-PNVI）上可获得 189% 的接枝率。平衡吸水能力值显示，与环氧氯丙烷交联的普鲁兰（pullulan-ECH）水凝胶（1000%）相比，普鲁兰-ECH-接枝-PNVI 水凝胶的 pH 值反应灵敏（6000%）。样品的进一步表征是通过傅立叶变换红外光谱（FTIR）、热重分析（TGA）和 X 射线衍射（XRD）进行的。在不同的 pH 值、染料浓度和时间条件下，研究了 MO 和 AG25 在 pullulan-ECH 接枝-PNVI 样品上的吸附情况。最佳吸附 pH 值为 3.0，吸附容量为 36.6 毫克 MO/克吸附剂和 5.72 毫克 AG25/克吸附剂。等温线和动力学研究描述了样品的吸附曲线。样品的吸附趋势最符合 Freundlich 模型，该模型支持异层染料吸附和表面异质性。吸附动力学结果表明了化学吸附的假二阶动力学模型。

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来源期刊

Journal of Water Chemistry and Technology CHEMISTRY, APPLIED-CHEMISTRY, ANALYTICAL

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0.00%

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审稿时长

>12 weeks

期刊介绍： Journal of Water Chemistry and Technology focuses on water and wastewater treatment, water pollution monitoring, water purification, and similar topics. The journal publishes original scientific theoretical and experimental articles in the following sections: new developments in the science of water; theoretical principles of water treatment and technology; physical chemistry of water treatment processes; analytical water chemistry; analysis of natural and waste waters; water treatment technology and demineralization of water; biological methods of water treatment; and also solicited critical reviews summarizing the latest findings. The journal welcomes manuscripts from all countries in the English or Ukrainian language. All manuscripts are peer-reviewed.