Graphene Oxide Surface Modification of Reverse Osmosis (RO) Membrane via Langmuir-Blodgett Technique: Balancing Performance and Antifouling Properties.

IF 3.3 4区 工程技术 Q2 CHEMISTRY, PHYSICAL
Dmitrii I Petukhov, James Weston, Rishat G Valeev, Daniel J Johnson
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Abstract

The reverse osmosis water treatment process is prone to fouling issues, prompting the exploration of various membrane modification techniques to address this challenge. The primary objective of this study was to develop a precise method for modifying the surface of reverse osmosis membranes to enhance their antifouling properties. The Langmuir-Blodgett technique was employed to transfer aminated graphene oxide films assembled at the air-liquid interface, under specific surface pressure conditions, to the polyamide surface with pre-activated carboxylic groups. The microstructure and distribution of graphene oxide along the modified membrane were characterized using SEM, AFM, and Raman mapping techniques. Modification carried out at the optimal surface pressure value improved the membrane hydrophilicity and reduced the surface roughness, thereby enhancing the antifouling properties against colloidal fouling. The flux recovery ratio after modification increased from 65% to 87%, maintaining high permeability. The modified membranes exhibited superior performance compared to the unmodified membranes during long-term fouling tests. This membrane modification technique can be easily scaled using the roll-to-roll approach and requires minimal consumption of the modifier used.

通过 Langmuir-Blodgett 技术对反渗透膜(RO)进行氧化石墨烯表面改性:平衡性能与防污特性。
反渗透水处理过程容易产生污垢问题,这促使人们探索各种膜改性技术来应对这一挑战。本研究的主要目的是开发一种精确的方法来改性反渗透膜的表面,以增强其防污性能。研究人员采用 Langmuir-Blodgett 技术,在特定的表面压力条件下,将组装在气液界面上的胺化氧化石墨烯薄膜转移到带有预活化羧基的聚酰胺表面。利用扫描电镜、原子力显微镜和拉曼图谱技术对改性膜的微观结构和氧化石墨烯的分布进行了表征。在最佳表面压力值下进行的改性提高了膜的亲水性,降低了表面粗糙度,从而增强了抗胶体污垢的性能。改性后的通量回收率从 65% 提高到 87%,同时保持了高渗透性。与未改性膜相比,改性膜在长期污垢测试中表现出更优越的性能。这种膜改性技术可以通过卷对卷的方法轻松实现规模化,而且所需的改性剂消耗量极少。
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
Membranes
Membranes Chemical Engineering-Filtration and Separation
CiteScore
6.10
自引率
16.70%
发文量
1071
审稿时长
11 weeks
期刊介绍: Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.
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