纤维素
吸附
Zeta电位
化学工程
微塑料
离子液体
碳纳米管
化学
材料科学
有机化学
纳米颗粒
环境化学
催化作用
工程类
标识
DOI:10.1016/j.cej.2023.143910
摘要
As global plastic production continues to increase, the issue of microplastic pollution cannot be ignored. In this paper, we explore the potential of cellulose benzoate based adsorbents for removing small-sized microplastics from water. By esterifying cellulose in an ionic liquid, AmimCl, we successfully synthesized cellulose benzoate based adsorbents, which were verified using FTIR, XRD, and solid-state NMR technology. When tested for their ability to remove polystyrene (PS) microplastics from water, cellulose benzoate exhibited a significant improvement in removal efficiency compared to the original cellulose, with the percentage increasing from 9.0% to 68.3%. This improvement can be attributed to their aromatic ring structure that allows for π-π interaction, as well as a higher zeta potential, leading to stronger electrical attraction. When cellulose benzoate was further modified with carbon nanotubes (CNTs) or magnetic carbon nanotubes (MCNTs), its PS removal efficiency further increased to above 97%, owing to the increased zeta potential and the reduction in particle size, which enhances its dispersion in water. Kinetic and isotherm modeling revealed that MCNT-modified cellulose benzoate exhibited superior adsorption rate and capacity, indicating its better performance as an adsorbent. These findings offer a promising approach for microplastic removal and present a new application for lignocellulosic biomass.
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