Scalable, high flux of electrospun nanofibers membrane for rapid adsorption-reduction synergistic removal of Cr(VI) ions in wastewater

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2024-12-04 DOI:10.1016/j.seppur.2024.130747

Dengbing Wang , Dingsheng Wu , Anfang Wei , Jun Gao , Chengling Pan , Ze Mao , Quan Feng

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引用次数: 0

Abstract

Trade-off between flux and reject rate is a long-standing shortcoming of membrane separation for heavy metal ions from wastewater. Herein, we design and develop a scalable, high flux of polyethyleneimine/amidoxime modified polyacrylonitrile (PEI/AOPAN) composite nanofibers membrane via using needle less electro-spun and chemical modification strategies. Subsequently, the prepared nanofibers membrane was used as a membrane separation material to rapidly and efficiently remove Cr(VI) ions from wastewater through the synergistic effect of adsorption-reduction. The result indicated that the scalable membrane was manufactured by needle free electrospinning and amine oxime modification process has the characteristics of uniform fiber diameter (315 nm), excellent hydrophilicity, good acid and alkali resistance stability, and excellent mechanical properties. During the dynamic separation process, the membrane can rapidly and efficiently remove Cr(VI) ions in wastewater (100 mg L⁻¹), which has a flux of up to 1146 L·m⁻¹·h⁻¹ and a retention rate of 99.53 % under pressure conditions of 0.08 MPa. The process of Cr(VI) ions removal by this membrane follows a pseudo first-order adsorption kinetics model and Langmuir adsorption isotherm model. This work confirms the feasibility of porous membrane adsorption with high capacity, and provides the possibility of adsorptive membranes for heavy metal ions from wastewater.

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高通量电纺丝纳米纤维膜快速吸附-还原协同去除废水中的Cr（VI）离子

长期以来，膜分离对废水中重金属离子的处理一直存在通量与截留率之间的矛盾。在此，我们设计并开发了一种可扩展的、高通量的聚乙烯亚胺/偕胺肟改性聚丙烯腈（PEI/AOPAN）复合纳米纤维膜，采用无针电纺丝和化学改性策略。随后，将制备的纳米纤维膜作为膜分离材料，通过吸附-还原的协同作用，快速高效地去除废水中的Cr（VI）离子。结果表明，采用无针静电纺丝和胺肟改性工艺制备的可伸缩膜具有纤维直径均匀（315 nm）、亲水性好、耐酸碱稳定性好、力学性能优异等特点。在动态分离过程中，膜能快速高效地去除废水中的Cr（VI）离子（100 mg L−1），在0.08 MPa的压力条件下，其通量可达1146 L·m−1·h−1，截留率为99.53 %。该膜去除Cr（VI）离子的过程符合准一级吸附动力学模型和Langmuir吸附等温线模型。本研究证实了高容量多孔膜吸附的可行性，为制备吸附膜处理废水中重金属离子提供了可能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.