摘要
由塑料碎片衍生而来的纳米塑料已在环境中广泛存在,对生态系统和人类健康构成严重威胁。为此通过化学共沉淀法合成一种新型吸附剂MAtp(磁改性凹凸棒土),用于去除水中纳米塑料。结果表明:MAtp对PS-NPs(聚苯乙烯纳米塑料)的最大吸附量可达75.43 mg/g。比表面积及孔隙度分析和VSM(磁性)分析显示,该吸附剂具有183.13 m^(2)/g的比表面积和优良的超顺磁性,满足磁分离要求。SEM(扫描电镜)分析、XRD(X射线衍射)、FT-IR(傅里叶红外光谱)、XPS(X射线能谱)表征显示,MAtp与PS-NPs之间存在明显静电吸引,Fe—O官能团对PS-NPs的捕获起着关键作用。PS-NPs在MAtp上的吸附过程符合拟一级动力学方程和Sips等温吸附模型。主要吸附机制包括静电吸引与表面络合。吸附-解吸实验表明MAtp吸附剂具有良好循环利用性能,为高效去除废水中纳米塑料提供了一种前景广阔的新方法。
Nanoplastics originating from plastic debris are prevalent in the environment,posing significant threats to ecosystems and human health.To address this issue,MAtp(magnetic attapulgite)was synthesized through a chemical co-precipitation method.The results indicate that MAtp achieves a maximum adsorption capacity of 75.43 mg/g for PS-NPs(polystyrene nanoplastics).BET and VSM analyses reveal that the adsorbent possesses a substantial specific surface area of 183.13 m^(2)/g and exhibits excellent superparamagnetism,fulfilling the criteria for magnetic separation.Characterization techniques including SEM,FT-IR,XRD and XPS demonstrates a significant electrostatic attraction between MAtp and PS-NPs,with Fe—O functional groups playing a crucial role in the entrapment of PS-NPs.The adsorption process of PS-NPs onto MAtp aligns with the proposed first-order kinetic equation and the Sips isothermal adsorption model.The primary mechanisms of adsorption include electrostatic attraction and surface complexation.Adsorption-desorption experiments confirm that the MAtp adsorbent possesses commendable adsorption capacity and recyclability.This study presents a promising and innovative approach for the efficient removal of nanoplastics from wastewater.
作者
韩枫
王烨
马俐琪
杨柳
刘思雨
安舒玉
刘蕾
HAN Feng;WANG Ye;MA Liqi;YANG Liu;LIU Siyu;AN Shuyu;LIU Lei(School of Water and Environment,Chang′an University,Xi′an 710054,Shaanxi Province,China;Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education,Chang′an University,Xi′an 710054,Shaanxi Province,China;Key Laboratory of Eco-Hydrology and Water Security in Arid Region of Ministry of Water Resources,Chang′an University,Xi′an 710054,Shaanxi Province,China)
出处
《化学工程》
北大核心
2025年第2期20-25,43,共7页
Chemical Engineering(China)
基金
陕西省科技计划项目重点研发计划项目(2020SF-422)。
关键词
磁性
凹凸棒土
聚苯乙烯
纳米塑料
吸附
magnetism
attapulgite
polystyrene
nanoplastics
adsorption
