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首页> 外文期刊>RSC Advances >Removal characteristics of two anionic dyes by a polyethylenimine/poly(N,N-dimethylaminoethyl methacrylate) gel
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Removal characteristics of two anionic dyes by a polyethylenimine/poly(N,N-dimethylaminoethyl methacrylate) gel

机译：聚乙烯亚胺/聚（N，N-二甲基氨基乙基甲基丙烯酸甲酯）凝胶对两种阴离子染料的去除特性

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摘要

The highly efficient gel obtained via the copolymerization of polyethylenimine (PEI) and poly( N , N -dimethylaminoethyl methacrylate) (PDMAEMA) was successfully applied for the removal of two anionic dyes (amaranth and sunset yellow) from their aqueous solutions. Moreover, the results of the adsorption experiments for sunset yellow and amaranth on the PEI/PDMAEMA gel demonstrate that the adsorption equilibrium both could be achieved within 1 h, and the maximum adsorption capacities were 757 mg g ~(?1) and 744 mg g ~(?1) under unoptimized conditions, respectively. Moreover, the PEI/PDMAEMA composite gel was found to be pH-sensitive and the addition of salts together with ionic strength were also explored for understanding the adsorption performance. In addition, it can be found from the studies of adsorption mechanism that it is mainly electrostatic adsorption; moreover, the separation process conforms to the Langmuir adsorption isotherm model and the pseudo second-order kinetic model, which is a spontaneous endothermic process. When the PEI/PDMAEMA gel was used in continuous flow column, it could handle large volumes of dye solution with very low concentrations due to its strong enrichment capacity. Finally, the desorption experiments show that the PEI/PDMAEMA gel is easier to regenerate and has a longer lifetime. Therefore, the high adsorption capacity and easy operation of adsorption for amaranth and sunset yellow on the PEI/PDMAEMA gel make it a potential application prospect for the practical removal of other kinds of similar pollutants.
机译：通过聚乙烯亚胺（PEI）和聚（N，N-二甲基氨基乙基甲基丙烯酸甲酯）（PDMAEMA）共聚获得的高效凝胶已成功用于从其水溶液中去除两种阴离子染料（ama色和日落黄）。而且，PEI / PDMAEMA凝胶对日落黄和a菜红的吸附实验结果表明，在1 h内均可达到吸附平衡，最大吸附容量为757 mg g〜（？1）和744 mg g。 〜（？1）分别在未优化的条件下。此外，发现PEI / PDMAEMA复合凝胶对pH敏感，并且还探索了盐的添加以及离子强度，以了解其吸附性能。另外，从吸附机理的研究可以发现，主要是静电吸附。此外，分离过程符合Langmuir吸附等温线模型和伪二级动力学模型，这是自发的吸热过程。当将PEI / PDMAEMA凝胶用于连续流色谱柱时，由于其强大的富集能力，它可以处理非常低浓度的大量染料溶液。最后，解吸实验表明，PEI / PDMAEMA凝胶更易于再生，使用寿命更长。因此，PEI / PDMAEMA凝胶对the菜红和日落黄的高吸附能力和易于吸附的吸附能力，为实际去除其他种类相似污染物提供了潜在的应用前景。

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