Quaternary‐Ammonium‐Based Gels with Varied Alkyl Chains for the Efficient Removal of Toxic Acid Orange 7,ChemistrySelect

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Quaternary‐Ammonium‐Based Gels with Varied Alkyl Chains for the Efficient Removal of Toxic Acid Orange 7
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-07-01 , DOI: 10.1002/slct.202001527
Sayantani Bhattacharya ₁ , Raja Shunmugam ₁

Affiliation

We report the design and synthesis of thiol‐norbornene based ingenious gels with pendent quaternary ammonium substituents on the norbornene backbone that are conducive to remove toxic anionic azo dye acid orange 7 (AO7) from wastewater. Three different alkyl side chains on the dangling quaternary ammonium moiety were chosen prudently and their performance towards removal of azo dye was scrutinised. The characterisation of all the precursor monomers and the ensuing gels were accomplished by ¹H, ¹³C NMR and Mass spectrometry. The influence of extent of crosslinking on the solvent uptake ability was investigated and the swelling nature of the gels were correlated with the solubility parameter of different solvents. The surface morphology of the gels as visualised by FE‐SEM analysis, revealed macropores in the range 4–12 μm. The relationship between the composition of quaternary ammonium moiety on the gels and their viscoelastic properties was realised. The dye removal kinetics as observed from UV‐Vis spectra were best correlated with the pseudo‐second‐order model and the adsorption isotherm of dye removal process was best fitted with the Langmuir isotherm model with high correlation coefficient. The material was found to be fairly recyclable up to 10^th cycles with loss of only 8% efficiency. To the best of our knowledge, this is the first ever report on the removal of anionic dye based on thiol‐norbornene photo crosslinked network. We believe that this design and composition‐property relationship will enthuse the researchers to develop efficient chemical adsorbents based on environmentally benign systems.

中文翻译：

具有可变烷基链的季铵盐基凝胶，可有效去除毒橙7

我们报告了基于降冰片烯主链上带有侧链季铵取代基的巯基降冰片烯精巧凝胶的设计和合成，这些凝胶有利于从废水中去除有毒的阴离子偶氮染料酸性橙7（AO7）。谨慎地选择悬空的季铵部分上的三个不同的烷基侧链，并仔细研究它们在去除偶氮染料上的性能。所有前体单体和随后的凝胶的表征均通过¹ H，¹³13 C NMR和质谱。研究了交联程度对溶剂吸收能力的影响，并且凝胶的溶胀性质与不同溶剂的溶解度参数相关。通过FE‐SEM分析可以看到凝胶的表面形态，发现大孔范围为4–12μm。实现了季铵部分在凝胶上的组成与其粘弹性的关系。从UV-Vis光谱观察到的染料去除动力学与伪二级模型最相关，并且染料去除过程的吸附等温线最适合具有高相关系数的Langmuir等温线模型。该材料被认为是相当可回收多达10^个循环仅损失8％的效率。据我们所知，这是有史以来第一个有关基于硫醇-降冰片烯光交联网络去除阴离子染料的报告。我们相信，这种设计和成分-性质的关系将使研究人员能够开发基于环境良性系统的高效化学吸附剂。

更新日期：2020-07-01

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