刚果红
吸附
化学
堆积
甲基蓝
废水
氢键
朗缪尔吸附模型
可重用性
化学稳定性
化学工程
金属有机骨架
无机化学
催化作用
分子
有机化学
环境工程
工程类
程序设计语言
软件
光催化
计算机科学
作者
Yan Wang,Wenpei Feng,Jinjun Li,Zhixiong You
标识
DOI:10.1016/j.ica.2022.121332
摘要
Metal-organic frameworks (MOFs) have shown attractive advantages in adsorbing dyes from wastewater. However, their complex synthesis processes and poor stability have limited their applications. Herein, we proposed a novel two-step route to prepare NH2-MIL-53(Fe) at room temperature and investigated its dye adsorption performance. The prepared NH2-MIL-53(Fe) displayed high water stability in the pH range of 3–11. Moreover, NH2-MIL-53(Fe) showed a significantly higher adsorption capacity and faster adsorption rate towards congo red (CR) than the other selected dyes, with more than 99 % of CR being removed by NH2-MIL-53(Fe) within 20 min. The maximum adsorption capacity of NH2-MIL-53(Fe) for CR was 1877 mg·g−1. Besides, the removal efficiency of CR could maintain higher than 80 % within the tested pH range (3 to 11), and removal efficiency was consistently higher than 95 % at different NaCl concentrations (0 to 0.4 M). The dynamic CR adsorption process matched the pseudo-second-order kinetic model and fitted well using the Langmuir model, suggesting that the adsorption of CR onto NH2-MIL-53(Fe) was a monomolecular-layer chemical adsorption process. More importantly, NH2-MIL-53(Fe) showed high removal efficiency and good reusability towards CR in both synthetic and model wastewater. Mechanistic studies suggested that the removal of CR was attributed to the synergistic effects of the π-π stacking interactions, hydrogen bonds and electrostatic interactions between CR and NH2-MIL-53(Fe). Overall, the present study provides a novel strategy for the facile synthesis of NH2-MIL-53(Fe), highlights the excellent adsorption performance and reusability towards CR and underlies the adsorption mechanisms involved.
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