A cationic porous polymer as a robust and recyclable adsorbent for the removal of harmful dyes from aqueous contaminants,Environmental Science: Nano

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A cationic porous polymer as a robust and recyclable adsorbent for the removal of harmful dyes from aqueous contaminants
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-08-23 , DOI: 10.1039/d2en00521b
Bijan Krishna Chandra _{1,

2} , Adinath Majee ₂ , Asim Bhaumik ₁

Affiliation

Adsorptive removal of organic dyes is considered as one of the most advanced technologies for water purification. Herein, a new nitrogen rich cationic porous organic polymer (VBT-POP) has been synthesized through the aqueous phase radical polymerization of triallylamine and (p-vinylbenzyl)trimethylammonium chloride. VBT-POP has been thoroughly characterized and used for the selective and quantitative adsorptive removal of two anionic dyes rose bengal (RB) and xylenol orange (XO) under different conditions. The VBT-POP is chemically and thermally robust in nature with a positive zeta potential. VBT-POP follows pseudo-second order adsorption kinetics for these two dyes. It follows the Langmuir adsorption isotherm with exceptionally high dye uptake capacities of 1252 mg g⁻¹ for RB and 735 mg g⁻¹ for XO. Sorption properties are compared considering the effects of pH and temperature. Calculation of various thermodynamic parameters reveals endothermic spontaneous adsorption along with wide pH range applicability. A proposed electrostatic interaction model of the adsorption mechanism has also been explored. Alkaline NaCl solutions almost completely desorb the adsorbed dyes through ultrasound treatment (UT). VBT-POP exhibited very good recyclability and high stability for the removal of these dyes from contaminated aqueous solutions for several consecutive adsorption cycles.

中文翻译：

阳离子多孔聚合物作为一种坚固且可回收的吸附剂，用于从水污染物中去除有害染料

有机染料的吸附去除被认为是最先进的水净化技术之一。在此，通过三烯丙基胺和（对乙烯基苄基）三甲基氯化铵的水相自由基聚合，合成了一种新型富氮阳离子多孔有机聚合物（VBT-POP）。VBT-POP 已被彻底表征并用于在不同条件下选择性和定量吸附去除两种阴离子染料玫瑰红 (RB) 和二甲酚橙 (XO)。VBT-POP 本质上具有化学和热稳定性，具有正 zeta 电位。VBT-POP 遵循这两种染料的准二级吸附动力学。^{它遵循 Langmuir 吸附等温线，具有 1252 mg g -1}的极高染料吸收能力对于 RB 和 735 mg g ^-1对于 XO。考虑到 pH 和温度的影响，比较吸附特性。各种热力学参数的计算揭示了吸热自发吸附以及广泛的 pH 范围适用性。还探索了吸附机制的拟议静电相互作用模型。碱性 NaCl 溶液通过超声处理 (UT) 几乎完全解吸吸附的染料。VBT-POP 表现出非常好的可回收性和高稳定性，可以从受污染的水溶液中去除这些染料，并进行几个连续的吸附循环。

更新日期：2022-08-23

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