离子液体交联高吸水性聚合物水凝胶：溶胀和染料吸附动力学,Langmuir

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离子液体交联高吸水性聚合物水凝胶：溶胀和染料吸附动力学
Langmuir ( IF 3.7 ) Pub Date : 2023-07-03 , DOI: 10.1021/acs.langmuir.3c00808
Palash Banerjee ₁ , Priyanka Dinda ₁ , Mahuya Kar ₁ , Mariusz Uchman ₂ , Tarun K Mandal ₁

Affiliation

使用聚合物凝胶去除废水中的有毒化学物质是学术和工业研究的一个重要领域。这项工作提出了一种使用设计的离子液体交联剂制造化学交联阳离子水凝胶吸附剂的简单方法，并成功地将其用于去除有机染料。分别通过 4-乙烯基苄基氯 (4VBC) 的简单亲核取代反应合成了两种不同的离子液体交联剂 [VIm-4VBC][Cl] (ILA)/[DMAEMA-4VBC][Cl] (ILB) 1-乙烯基咪唑 (VIm) 和甲基丙烯酸 2-(二甲基氨基)乙酯 (DMAEMA)。N , N , N ', N '-四甲基乙二胺 (TEMED)。干燥的 CPAam 和 CPHEMA 干凝胶表现出大孔形态和高热稳定性。水凝胶样品表现出高溶胀行为，并且水分子扩散到水凝胶中遵循伪菲克动力学。水凝胶网络中的阳离子交联位点可以更好地与阴离子染料结合，并且这些染料吸收能力是使用不同模型阴离子染料通过紫外可见光谱测定的。这些水凝胶上的染料吸附遵循伪二级动力学模型。还利用颗粒内扩散和博伊德动力学模型分析了吸附机理。最大平衡吸附容量之间的关系（Langmuir 和 Freundlich 等温线模型可以更好地描述曙红 B (EB) 染料水凝胶的q _m ) 和平衡 EB 浓度，并且使用 Langmuir 等温线估计的 q m可以_{达到100 mg g}^–1以上。交联水凝胶可以很容易地再生，并且在多达三个连续的染料吸附-解吸循环中具有>80%的回收效率，这在废水处理中的应用具有广阔的前景。

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Ionic Liquid Cross-Linked High-Absorbent Polymer Hydrogels: Kinetics of Swelling and Dye Adsorption

The use of polymer gels for the removal of toxic chemicals from wastewater is an important area in terms of both academic and industrial research. This work presents a simple approach to the fabrication of chemically cross-linked cationic hydrogel adsorbents using designed ionic liquid-based cross-linkers and their successful use in the removal of organic dyes. Two different ionic liquid cross-linkers, [VIm-4VBC][Cl] (ILA)/[DMAEMA-4VBC][Cl] (ILB), are synthesized by the simple nucleophilic substitution reaction of 4-vinylbenzyl chloride (4VBC) separately with 1-vinylimidazole (VIm) and 2-(dimethylamino)ethyl methacrylate (DMAEMA). Cross-linked poly(acrylamide) (CPAam) and poly(2-hydroxyethyl methacrylate) (CPHEMA) hydrogels are then prepared from the corresponding monomers and as-synthesized cross-linkers (ILA and ILB) by free radical polymerization in the presence of a redox initiator combining ammonium persulfate (APS) and N,N,N′,N′-tetramethylethylenediamine (TEMED). The dried CPAam and CPHEMA xerogels exhibit macroporous morphology and high thermal stability. The hydrogel samples exhibit high swelling behavior, and the diffusion of water molecules into the hydrogels follows pseudo-Fickian kinetics. The cationic cross-linking sites in the hydrogel networks allow preferable binding with anionic dyes, and these dye uptake capacities are determined using different model anionic dyes via UV–vis spectroscopy. The dye adsorption onto these hydrogels follows a pseudo-second-order kinetic model. The adsorption mechanism is also analyzed by employing intraparticle diffusion and Boyd kinetic models. The relationship between the maximum equilibrium adsorption capacity (q_m) of the hydrogels for eosin B (EB) dye and the equilibrium EB concentration can be better described by Langmuir and Freundlich isotherm models, and the estimated q_m using the Langmuir isotherm can reach more than 100 mg g^–1. The cross-linked hydrogels can be easily regenerated and have a recycling efficiency of >80% for up to three consecutive dye adsorption–desorption cycles, which is promising for their use in wastewater treatment.

更新日期：2023-07-03

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