Enhancing durability and oil-water separation efficiency with plasma-treated graphene oxide coated mesh

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2024-10-30 DOI:10.1016/j.surfcoat.2024.131495

Jashaswinee Swain, Bhumireddy Himajaa Reddy, Nandini Bhandaru

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Abstract

In recent years, there has been a surge in interest surrounding the fabrication and utilization of superhydrophobic and superhydrophilic surfaces, driven by their exceptional functionalities and properties. Graphene Oxide (GO) has inherent hydrophilicity and underwater superoleophobicity, which has made this material a particularly capable candidate for oil-water separation. Addressing the persistent challenge of efficient oil-water separation in industrial contexts, this study presents the fabrication of a GO-coated stainless steel mesh via a facile dip coating method augmented by an intermediate two-step O₂ plasma treatment. The coated meshes were tested with various oil and water mixtures, including neutral, acidic, saline, and hot water, to find separation efficiency and recyclability. Notably, the meshes can achieve excellent separation efficiency of approximately 98.9 % and a superior flux of 11,464 L m⁻² h⁻¹ driven by gravity. This is a significant improvement over GO-coated meshes without O₂ plasma treatment. Moreover, the plasma-treated meshes exhibit robust long-term durability and chemical stability, maintaining high underwater oil contact angles ≥119° even after extended immersion in diverse pH mediums and salt solutions for 150 days. This work showcases the practical viability of plasma-treated GO-coated meshes for oil-water separation applications and establishes a framework for systematically evaluating their long-term performance in harsh immersion conditions.

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利用经等离子处理的氧化石墨烯涂层滤网提高耐久性和油水分离效率

近年来，在超疏水和超亲水表面的特殊功能和特性的推动下，人们对制造和利用这些表面的兴趣激增。氧化石墨烯（GO）具有固有的亲水性和水下超疏水性，这使得这种材料特别适合用于油水分离。为了应对工业环境中高效油水分离的长期挑战，本研究通过一种简便的浸涂方法，并辅以中间的两步 O2 等离子处理，制备了一种涂有 GO 的不锈钢网。研究人员用各种油水混合物（包括中性水、酸性水、盐水和热水）对涂有 GO 涂层的不锈钢网进行了测试，以了解其分离效率和可回收性。值得注意的是，在重力的驱动下，网格的分离效率高达约 98.9%，通量高达 11,464 L m-2 h-1。与没有经过 O2 等离子处理的 GO 涂层网格相比，这是一个重大改进。此外，经过等离子体处理的网格还具有很强的长期耐久性和化学稳定性，即使在不同 pH 值的介质和盐溶液中长时间浸泡 150 天，仍能保持较高的水下油接触角 ≥119°。这项工作展示了等离子体处理过的 GO 涂层网格在油水分离应用中的实际可行性，并为系统评估其在恶劣浸泡条件下的长期性能建立了一个框架。

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

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.