Strengthening cationic repulsion on graphene oxide membrane to boost water desalination

IF 5.5 3区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2024-10-16 DOI:10.1016/j.jtice.2024.105799

Ziyi Huang , Xiaojia Zhang , Fan Yang , Rajkumar Devasenathipathy , Xinglan Peng , Limin Wang , Dujuan Huang , Youjun Fan , Wei Chen , Du-Hong Chen

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Abstract

Background

As a hydrophilic two-dimensional material with oxygen-containing groups on its basal planes, graphene oxide (GO) has been used for the fabrication of GO-based membranes to purify/desalinate water. However, promoting salt rejection of GO-based membranes is challenging while maintaining high water permeability.

Methods

First, the mercaptoethylamine-modified Ag NWs (Ag-MA) were prepared by mixing Ag NWs and MA to form Ag—S bonds. Then, Ag-MA was deposited on the GO membrane under externally assisted filtration to achieve the GO/Ag-MA membrane, which ensures the well-stacking of GO sheets and the even coating of GO membrane. Therefore, the delicately fabricated membrane possesses great electropositive cations and high swelling-tolerance in water solution.

Significant findings

We found that a high electrostatic repulsive interaction between the amino group and metal cations in GO/Ag-MA membrane aided the promotion of rejection rates, which was up to 75 % for both K⁺ and Mg²⁺, surpassing that of the previously reported values. This work highlights a new approach for enhancing the electrostatic repulsion with metal cations near the surface/interface of GO-based membranes and their application in the development of water desalination and purification.

Abstract Image

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加强氧化石墨烯膜上的阳离子斥力，促进海水淡化

背景氧化石墨烯（GO）是一种亲水性二维材料，其基底面上含有含氧基团，已被用于制造基于 GO 的膜来净化/脱盐水。首先，通过混合 Ag NWs 和 MA 以形成 Ag-S 键，制备了巯基乙胺修饰的 Ag NWs（Ag-MA）。然后，在外部辅助过滤的条件下，将 Ag-MA 沉积在 GO 膜上，得到 GO/Ag-MA 膜，从而保证了 GO 片的良好堆积和 GO 膜的均匀包覆。重要发现我们发现，GO/Ag-MA 膜中的氨基与金属阳离子之间的高静电排斥作用有助于提高排斥率，对 K+ 和 Mg2+ 的排斥率均高达 75%，超过了之前报道的数值。这项工作强调了一种新方法，可增强 GO 基膜表面/界面附近金属阳离子的静电斥力，并将其应用于海水淡化和净化的开发。

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.