吸附
化学
朗缪尔吸附模型
单层
化学工程
氢键
动力学
污染物
无机化学
有机化学
分子
生物化学
物理
量子力学
工程类
作者
Jie Jia,Chenyang Wang,Yiju Li,Dequn Wu,Jianyong Yu,Tingting Gao,Faxue Li
标识
DOI:10.1016/j.seppur.2022.120970
摘要
Cyclodextrin (CD), as a naturally green starch derivative, is a promising candidate for water treatment through adsorption. Unfortunately, the soluble nature of CD in water limits its application greatly. In this work, a water-insoluble CD-based nanocube ([email protected]) with high adsorption performance toward dissolved pollutants is first developed through a facile two-step route. The prepared [email protected] has high water stability and well-defined cubic morphology with a porous structure. Additionally, the [email protected] nanocubes present prominent adsorption performance with the maximum adsorption capacities of 2173.21, 998.54, and 966.06 mg g−1 towards methylene blue (MB), bisphenol A (BPA), and Pb(Ⅱ), respectively, which is much higher than those of many other adsorbents. The adsorption equilibrium can be achieved within 10 and 30 s for MB and Pb(Ⅱ) adsorption, respectively, indicating the ultrafast adsorption rate. These adsorption processes are ascribed to the pseudo-second-order adsorption kinetics and Langmuir isotherm model, signifying the chemical and monolayer adsorption process. Moreover, the removal efficiency of the [email protected] nanocubes towards three different pollutants remains over 85% even after 10 recycles of regeneration. The superior adsorption performance of our [email protected] is attributed to the synergetic effect of host–guest interaction, electrostatic adsorption, hydrogen bond interaction, and chelation. More importantly, the applicability of [email protected] is successfully demonstrated under real industrial wastewater conditions. This work provides a promising strategy to prepare the water-insoluble CD-based adsorbent with a regular cubic structure, which can be potentially applied in the practical applications of industrial wastewater treatment.
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