Abstract

In the present study, a synergistic effect between cationic methylene blue (MB) and anionic acid red 1 (AR1) on their concurrent adsorptive removal from aqueous binary solution onto durian rind (DR) was systematically investigated in batch mode across different parameters. The concurrent adsorption was pseudo-second-order kinetics and followed the Langmuir isotherm model, similar to their respective single component. The kinetics and intraparticle diffusion analyses demonstrated that the adsorption rate of MB was a 15-fold faster than AR1, and mass transports were governed by a combination of intraparticle and film diffusion. The synergistic effect was evidenced by an enhanced adsorption efficiency of AR1 from 27 to 42%, while that of MB was almost unchanged (97–98%). By changing the molar ratios of MB and AR1, it was found that the maximum adsorption capacity of MB and AR1 was 249 and 200 mg g⁻¹, respectively, in the binary system higher compared with those in their respective single system (108 and 16 mg g⁻¹). Overall data indicated that the synergistic effect was due to electrostatic interactions between cationic and anionic synthetic dyes, supported by negatively charged DR surface, leading to the formation of their stacking layers on the adsorbent surface.

Novelty statement: A synergistic effect in concurrent adsorptive removal of synthetic dyes from multicomponent wastewater remains a critical research challenge. We believed that electrostatic interaction between ionic dyes could be explored to enhance their removal efficiency. This report is the first time that such a synergistic effect between cationic methylene blue (MB) and anionic acid red 1 (AR1) on their concurrent adsorption from aqueous binary system is systematically investigated. The kinetics, isotherm, thermodynamics, and mechanism of the concurrent adsorption of MB and AR1 attributed to the synergistic effect are elucidated in detail.

摘要

在本研究中，阳离子亚甲蓝 (MB) 和阴离子酸红 1 (AR1) 之间的协同效应对它们从二元水溶液中同时吸附去除到榴莲皮 (DR) 上的协同作用在不同参数下以分批模式进行了系统研究。同时吸附是准二级动力学并遵循朗缪尔等温线模型，类似于它们各自的单一组分。动力学和颗粒内扩散分析表明，MB 的吸附速率比 AR1 快 15 倍，并且传质受颗粒内和薄膜扩散的组合控制。AR1 的吸附效率从 27% 提高到 42%，证明了协同效应，而 MB 的吸附效率几乎没有变化（97-98%）。通过改变 MB 和 AR1 的摩尔比，^-1分别在二元系统中高于它们各自的单一系统中的那些（108 和 16 mg g ^-1）。总体数据表明，协同效应是由于阳离子和阴离子合成染料之间的静电相互作用，由带负电荷的 DR 表面支持，导致它们在吸附剂表面上的堆积层的形成。

新颖性声明：从多组分废水中同时吸附去除合成染料的协同效应仍然是一项关键的研究挑战。我们相信可以探索离子染料之间的静电相互作用来提高它们的去除效率。本报告首次系统地研究了阳离子亚甲蓝 (MB) 和阴离子酸红 1 (AR1) 对它们从水性二元系统中同时吸附的协同作用。详细阐明了归因于协同效应的MB和AR1同时吸附的动力学、等温线、热力学和机理。