Underwater superoleophobic and underoil superhydrophobic PDA/Na2SiO3/N-TiO2coated mesh for selective oil/water separation and photocatalytic degradation of methylene blue

IF 3 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Environmental Science and Technology Pub Date : 2024-10-22 DOI:10.1007/s13762-024-06134-1

D. Q. Y. Alfarraji, A. A. Amooey, F. Elmi

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引用次数: 0

Abstract

In this study, a modified stainless steel (SS) mesh was used to selectively separate both light and heavy oils from oil/water mixtures. The first layer consisted of polydopamine (PDA). The rigid building blocks of Na₂SiO₃ and N-TiO₂ were formed on the SS/PDA surface, resulting in the SS/PDA/Na₂SiO₃/N-TiO₂ mesh. Modified meshes were characterized using FESEM/EDX, ATR-FTIR spectroscopy, underwater oil contact angle, and underoil water contact angle methods. The results revealed that the underoil superhydrophobic and underwater superoleophobic coated mesh could selectively remove both heavy and light oils from water for up to twenty repeated cycles, with high separation efficiencies of 94% and 98%, respectively. The modified mesh demonstrated high photocatalytic degradation of methylene blue within 240 min under UV-A illumination. This specially designed membrane offers the benefit of selectively separate heavy and light oils from oil/water mixtures without the need for external stimuli. Furthermore, it exhibits photo-responsive characteristics and can effectively degrade pollutants when exposed to UV-A light. Therefore, the coated mesh can show significant promise for industrial applications.

Graphical abstract

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水下超疏油和水下超疏水PDA/Na2SiO3/ n - tio2涂层网用于选择性油/水分离和光催化降解亚甲基蓝

在这项研究中，使用改良的不锈钢（SS）网选择性地从油/水混合物中分离轻油和重油。第一层由聚多巴胺（PDA）组成。在SS/PDA表面形成了Na2SiO3和N-TiO2的刚性构件，形成SS/PDA/Na2SiO3/N-TiO2网状结构。利用FESEM/EDX、ATR-FTIR光谱、水下油接触角和水下水接触角等方法对改进后的网格进行了表征。结果表明，水下超疏水和水下超疏油涂层网可以选择性地去除水中的重油和轻油，分离效率分别为94%和98%，可重复达20次。在UV-A照射下，改性后的网状物在240 min内具有良好的亚甲基蓝光催化降解效果。这种特殊设计的膜具有选择性地从油/水混合物中分离重油和轻油的优点，而无需外部刺激。此外，它具有光响应特性，当暴露在UV-A光下时可以有效地降解污染物。因此，涂层网可以在工业应用中显示出显著的前景。图形抽象

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来源期刊

International Journal of Environmental Science and Technology 环境科学-环境科学

CiteScore

5.60

自引率

6.50%

发文量

806

审稿时长

10.8 months

期刊介绍： International Journal of Environmental Science and Technology (IJEST) is an international scholarly refereed research journal which aims to promote the theory and practice of environmental science and technology, innovation, engineering and management. A broad outline of the journal''s scope includes: peer reviewed original research articles, case and technical reports, reviews and analyses papers, short communications and notes to the editor, in interdisciplinary information on the practice and status of research in environmental science and technology, both natural and man made. The main aspects of research areas include, but are not exclusive to; environmental chemistry and biology, environments pollution control and abatement technology, transport and fate of pollutants in the environment, concentrations and dispersion of wastes in air, water, and soil, point and non-point sources pollution, heavy metals and organic compounds in the environment, atmospheric pollutants and trace gases, solid and hazardous waste management; soil biodegradation and bioremediation of contaminated sites; environmental impact assessment, industrial ecology, ecological and human risk assessment; improved energy management and auditing efficiency and environmental standards and criteria.