Exploring the potential of cellulose benzoate adsorbents modified with carbon nanotubes and magnetic carbon nanotubes for microplastic removal from water

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
作者
Shihong Liu,Jun Wang
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:469: 143910-143910 被引量:37
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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