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首页> 外文期刊>New Journal of Chemistry >Multifunctional glycerol/citric acid crosslinked polymer hydrophilic gel with absorptive and reducing properties
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Multifunctional glycerol/citric acid crosslinked polymer hydrophilic gel with absorptive and reducing properties

机译：多官能甘油/柠檬酸交联聚合物亲水性凝胶，具有吸收和还原性能

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摘要

This work describes a hydrophilic polymeric gel with satisfactory water absorption (1.4 gH2O g-1gel at pH = 10) and reducing capacity prepared from the reaction of glycerol oleate esters with citric acid. Elemental analysis and FTIR spectroscopy suggest that the oleate portion of the starting material is not present in the final composition of the isolated gel. Nevertheless, it plays a vital role in the reaction while assisting the formation of the crosslinked polymer composed by glycerol and citric acid in a 1 : 1 molar ratio. This gel allows for the simultaneous adsorption/reduction of dark-blue indigo carmine dye in aqueous medium endorsing its dual role in this process. The reducing capacity of the gel was also confirmed through the reactivity towards permanganate (MnO4-) ions, leading to the formation of MnO2, whose crystalline phase was confirmed by PXRD. Citrate present in the structure of the gel matrix is key to justify its reducing behavior. This property opens new avenues to produce gels bearing noble metal nanoparticles, and we demonstrate this approach via adsorption/reduction of Ag+ ions in aqueous solution that yields a gel containing Ag nanoparticles with potential biomedical applications. This hybrid material was fully characterized by UV-Vis, SEM, and PXRD analyses indicating the formation of highly dispersed Ag0 nanoparticles with an average diameter of 20 nm.
机译：这项工作描述了一种亲水性聚合物凝胶，它具有令人满意的吸水性（1.4 gH2Og-1凝胶，pH=10），并通过油酸甘油酯与柠檬酸的反应制备出还原能力。元素分析和FTIR光谱表明，起始材料的油酸部分不存在于分离凝胶的最终成分中。然而，它在反应中起着至关重要的作用，同时有助于形成由甘油和柠檬酸按1:1摩尔比组成的交联聚合物。该凝胶允许在水介质中同时吸附/还原深蓝色靛蓝胭脂红染料，从而证实其在该过程中的双重作用。凝胶的还原能力也通过对高锰酸盐（MnO4-）离子的反应性得到证实，导致形成MnO2，其晶相经PXRD确认。凝胶基质结构中的柠檬酸盐是证明其还原行为的关键。这种特性为制备含有贵金属纳米颗粒的凝胶开辟了新途径，我们通过在水溶液中吸附/还原Ag+离子来证明这种方法，从而产生含有银纳米颗粒的凝胶，具有潜在的生物医学应用。通过UV-Vis、SEM和PXRD分析对这种杂化材料进行了充分的表征，表明形成了平均直径为20nm的高度分散的Ag0纳米颗粒。

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