Abstract

In this study, two new basic polymeric resins were prepared, characterized, and investigated for their usability as adsorbent for acidic dyes removal from aqueous solution. Basic resins (R1-Mod and R2-Mod) were prepared by modifying crosslinked polymers of MA-DVB (R1) and GMA-DVB (R2) with tetraethylenepentaamine (TEPA). Characterization studies showed that the R1-Mod resin prepared from R1 had a low surface area and its particle size was at the micron level but the R2-Mod resin prepared from R2 had a high surface area, and also its particle size was at the nano-level. In the adsorption studies, R1-Mod worked in a narrow pH and concentration range for just RR45, while R2-Mod worked in a wide pH and concentration range for both RR45 and dye mixture due to superior textural properties. It was observed that adsorption behavior of R1-Mod was in agreement with Freundlich isotherm model, but R2-Mod resin was in agreement with the Langmuir isotherm model. Kinetic results were consistent with the pseudo-second-order and intra-particle diffusion models for both resins. It was found that the adsorption process for both resins was exothermic, spontaneous and favorable at lower temperature. Also, it was observed that the resins did not lose their high removal affinity at five reusability for 400 ppm RR45.

Graphic abstract

中文翻译：

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使用纳米碱性树脂有效去除具有纳米花形成的偶氮染料

摘要

在这项研究中，制备了两种新型的碱性聚合物树脂，对其进行了表征，并研究了它们作为吸附剂从水溶液中去除酸性染料的适用性。通过用四亚乙基五胺（TEPA）改性MA-DVB（R1）和GMA-DVB（R2）的交联聚合物来制备基础树脂（R1-Mod和R2-Mod）。表征研究表明，由R1制备的R1-Mod树脂具有较低的表面积，其粒径为微米级，而由R2制备的R2-Mod树脂具有较高的表面积，且其粒径为纳米级。 -等级。在吸附研究中，R1-Mod仅在RR45的pH和浓度范围内起作用，而R2-Mod由于具有优异的质地特性，在RR45和染料混合物的pH和浓度范围内起作用。观察到R1-Mod的吸附行为与Freundlich等温线模型一致，但是R2-Mod树脂与Langmuir等温线模型一致。动力学结果与两种树脂的拟二级和颗粒内扩散模型一致。发现两种树脂的吸附过程是放热的，自发的并且在较低温度下是有利的。另外，观察到对于400ppm RR45，该树脂在五种可重复使用性时没有丧失其高去除亲和力。

图形摘要