Multifunctional pH-responsive carbon-based hydrogel adsorbent for ultrahigh capture of anionic and cationic dyes in wastewater

吸附 孔雀绿 化学 阳离子聚合 废水 亚甲蓝 化学工程 柠檬黄 工业废水处理 朗缪尔吸附模型 色谱法 核化学 有机化学 催化作用 废物管理 光催化 工程类
作者
Xin Li,Keran Li
出处
期刊:Journal of Hazardous Materials [Elsevier BV]
卷期号:449: 131045-131045 被引量:7
标识
DOI:10.1016/j.jhazmat.2023.131045
摘要

An environmental friendly hydrogel adsorbent (DEC@GEL) was successfully manufactured by a facile free-radical polymerization method. Multiple characterizations demonstrated that the adsorbent was rich in functional groups and porous structures. The batch and multisystem adsorption experiments were applied to systematically investigate the adsorption properties of methylene blue (MB), malachite green (MG), indigo sodium dimethyl sulfonate (IC) and tartrazine (TR) in wastewater. The experimental results proved that the kinetic and isotherms of four dyes were more consistent with the pseudo-second-order and Langmuir model, respectively. Notably, the maximum adsorption capacities of MB, MG, TR and IC at 318 K were 2186.85, 2302.53, 1766.13 and 2301.75 mg/g, respectively, which were higher than many adsorbents that had been reported. Recycle experiment demonstrated the high reusability of the DEC@GEL. The selectivity and adsorption column experiments proved that DEC@GEL was not only widely applicable to various dyes, but also provided a positive start for the industrial application. Moreover, the simulated adsorption experiments further demonstrate that DEC@GEL had the prospect of application in real industrial conditions. Finally, four adsorption mechanisms had been proposed. Various adsorption experiments had shown that DEC@GEL was not only efficient in processing dyes, but also had great potential for practical industrial applications.
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