Green and sustainable pH-responsive adsorptive membrane using aminated-MXene mangrove filled polylactic acid ultrafiltration membrane for enhanced water permeability and microplastic removal

IF 8.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2024-11-03 DOI:10.1016/j.desal.2024.118268

Fatema Khamis, Hanaa M. Hegab, Shadi W. Hasan

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Abstract

A green and sustainable pH-responsive adsorptive membrane using aminated-MXene mangrove filled (MXAM) polylactic acid ultrafiltration membrane was developed. The material synthesis involved employing the common in-situ HF acid-based etching method with Li⁺ intercalant, while membrane fabrication utilized the non-solvent induced phase inversion (NIPS) technique. The study tested pH-responsive adsorption and filtration using a 20 ppm synthetic polystyrene (PS) microplastic (MPs) suspension at pH 4, 7, and 10. Incorporating 1.5 wt% MXAM enhanced water permeability to 1855.6 LMHbar and achieved rejection rates of 79 %, 91.5 %, and 99.9 % for pH 4, 7, and 10, respectively. These improvements can be attributed to enhanced porosity, pore size, hydrophilicity, and surface charges. The kinetics of the adsorptive 1.5PLAMXAM membrane for PS MPs at 5 ppm and pH 7 showed psuedo-second-order kinetics (R² = 0.967) matching experimental adsorption (q_e,exp = 12.4 mg.g⁻¹), indicating chemical adsorption. The equilibrium data of 1.5PLAMXAM membrane fitting the Langmuir isotherm, showed an increase in q_e,exp from 5.69 to 12.79 mg.g⁻¹ at pH 4 and 10, respectively, attributed to a higher density of pH-responsive groups. The fitted Langmuir isotherm suggested a maximum monolayer coverage of q_m = 23.5 mg.g⁻¹.

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利用胺化-MXene 红树林填充聚乳酸超滤膜提高透水性和微塑料去除率的绿色可持续 pH 响应吸附膜

利用氨基化-MXene 红树林填充（MXAM）聚乳酸超滤膜开发了一种绿色、可持续的 pH 响应吸附膜。材料合成采用了常见的原位高频酸基蚀刻法，并添加了 Li+ 插层剂，而膜制造则采用了非溶剂诱导相反转（NIPS）技术。研究使用 20 ppm 合成聚苯乙烯（PS）微塑料（MPs）悬浮液在 pH 值为 4、7 和 10 的条件下测试了 pH 值响应吸附和过滤。加入 1.5 wt% 的 MXAM 可将透水性提高到 1855.6 LMHbar，pH 值为 4、7 和 10 时的排斥率分别为 79%、91.5% 和 99.9%。这些改进可归因于孔隙率、孔径、亲水性和表面电荷的增强。在 5 ppm 和 pH 值为 7 时，1.5PLAMXAM 膜对 PS MPs 的吸附动力学（R2 = 0.967）与实验吸附（qe,exp = 12.4 mg.g-1）相吻合，显示出化学吸附作用。拟合 Langmuir 等温线的 1.5PLAMXAM 膜的平衡数据显示，在 pH 值为 4 和 10 时，qe,exp 分别从 5.69 增加到 12.79 mg.g-1，这归因于 pH 反应基团的密度较高。拟合的朗缪尔等温线表明最大单层覆盖率为 qm = 23.5 mg.g-1。

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.