Nanoplastics Removal from Water using Metal–Organic Framework: Investigation of Adsorption Mechanisms, Kinetics, and Effective Environmental Parameters
Nanoplastics Removal from Water using Metal–Organic Framework: Investigation of Adsorption Mechanisms, Kinetics, and Effective Environmental Parameters
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DOI：
10.1021/acsaenm.2c00174
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Sweta Modak;Medha Kasula;M. Esfahani
中科院分区：
文献类型：
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作者：
Sweta Modak;Medha Kasula;M. Esfahani
纳米塑料由于其具有挑战性的去除过程和运输共存污染物的能力而成为环境关注的焦点。纳米塑料具有可迁移性、小尺寸（<1 μm）和蓄积性，对陆生、水生生物和人类具有毒性，可引起炎症和氧化应激。在这项研究中，我们研究了使用铬基金属有机骨架（Cr-MOF/MIL-101）从水中去除聚苯乙烯纳米塑料（PSNPs）。以硝酸铬和对苯二甲酸为原料，通过水热法合成了Cr-MOF，并通过不同的分析方法对其进行了表征。在初始浓度为5和70 ppm时，去除率达到96%，吸附动力学符合准一级模型。室温下吸附等温线最符合Freundlich吸附模型，吸附量最大可达800 mg/g。PSNPs与Cr-MOF之间的静电相互作用是吸附的主要机制。Cr-MOF对PSNPs的循环去除表现出可接受的再生能力。
Nanoplastics are becoming a concern for the environment and are gaining significant attention due to their challenging removal process and ability to transport coexisting pollutants. Because of their mobility, small size (<1 μm), and accumulation tendency, nanoplastics are toxic for terrestrial and aquatic living organisms and humans, causing inflammation and oxidative stress. In this study, we investigated the removal of polystyrene nanoplastics (PSNPs) from water using a chromium-based metal–organic framework (Cr-MOF/MIL-101). Cr-MOF was synthesized via a hydrothermal method using chromium nitrate and terephthalic acid and characterized via different analytical approaches. A 96% removal efficiency was achieved with initial concentrations of 5 and 70 ppm and adsorption kinetics followed the pseudo-first-order model. The adsorption isotherm at room temperature was best fitted with the Freundlich adsorption model, and the maximum adsorption capacity of 800 mg/g was achieved. The electrostatic interaction between PSNPs and Cr-MOF was the most dominating mechanism responsible for adsorption. The Cr-MOF showed acceptable regeneration capacity for cyclic removal of PSNPs.