A review of 3D superhydrophilic porous materials for oil/water separation

Li, Shaofang; Huang, Likun; Wang, Dongdong; Zhou, Simin; Sun, Xiyu; Zhao, Rui; Wang, Guangzhi; Yao, Tianqing; Zhao, Kexin; Chen, Ran

doi:10.1016/j.seppur.2023.124847

Cited by 13 publications

(2 citation statements)

References 172 publications

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“…where θ is the CA on an ideal smooth surface, γ SA and γ SL are the interfacial energy/tension of the solid-air and solid-liquid, respectively, and γ LA denotes the interface energy/tension between liquid and air [46,64] (Figure 1a). The SA is the angle between the inclined plane and the horizontal plane when the surface is gradually tilted to the point where the droplet is just able to slide [65] (Figure 1b).…”

Section: Wettability Theory and Design Strategy Of Laser-fabricated O...mentioning

confidence: 99%

Laser Manufacturing of Superwetting Oil–Water Separation Materials: A Review

Xiong,

Zhu,

Jiang

et al. 2024

Separations

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The frequent occurrence of oil spills and the massive discharge of oily wastewater pose a significant threat to sustainable and healthy human development. Therefore, it is of importance to effectively separate oil–water mixtures. Inspired by nature, many superwetting surfaces/materials for oil–water separation have been developed in recent years. However, these surfaces/materials are subject to certain limitations and are unable to fully meet practical needs. With the advancement of laser technology, a novel solution has been provided for fabricating superwetting oil–water separation materials. Based on the design theory and separation mechanism, this paper summarizes the research progress of the laser-fabricated superwetting surfaces/materials for oil–water separation in recent years. First, the basic wetting theory, design strategy, and oil–water separation mechanism of the laser-fabricated materials are introduced in detail. Subsequently, the laser-fabricated oil–water separation materials, including superoleophilic/superhydrophobic materials, superhydrophilic/superoleophobic materials, and materials with reversible or superamphiphilic wettability, are systematically summarized and analyzed. Finally, the challenges and future research directions of laser-fabricated superwetting oil–water separation materials are discussed.

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Section: Wettability Theory and Design Strategy Of Laser-fabricated O...mentioning

confidence: 99%

Laser Manufacturing of Superwetting Oil–Water Separation Materials: A Review

Xiong,

Zhu,

Jiang

et al. 2024

Separations

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show abstract

“…Although the traditional separation methods include the electrochemical method, precipitation method, biological method, centrifugal method, sol-gel method, and adsorption method, etc., they generally have disadvantages such as low separation efficiency, easy-to-produce secondary pollution, and high energy consumption. With the rapid development of interface science, separation membrane materials modified with special wettability were considered as candidates for separating [7].…”

Section: Introductionmentioning

confidence: 99%

Nanostructure-Based Oil–Water Separation: Mechanism and Status

Wang,

Feng,

Wang

et al. 2023

Separations

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Flexible and effective methods for oil–water separation are crucial for reducing pollutant emissions and safeguarding water and fuel resources. In recent years, there has been growing interest in fundamental research and engineering applications related to water and fuel purification, especially oil–water separation. To date, filter materials with special wetting characteristics have been widely used in oil–water separation. Nanostructured materials are one of the most attractive candidates for next-generation oil–water separation. This review systematically summarizes the mechanisms and current status of oil–water separation using nanostructured materials. Basically, this can be achieved by using nanostructured materials with specific wettability and nanostructures. Here, we provide a detailed discussion of two general approaches and their filtration mechanisms: (1) the selective filtration technique, based on specific surface wettability, which allows only oil or water to penetrate while blocking impurities; (2) the absorption technique, employing porous sponges, fibers, or aerogels, which selectively absorbs impure oil or water droplets. Furthermore, the main failure modes are discussed in this review. The purposes of this article are: (1) to summarize the methods of oil–water separation by nanotechnology; (2) to raise the level of environmental protection consciousness of water pollution by using nanotechnology; (3) to tease out the features of different approaches and provide a pivotal theoretical basis to optimize the performance of filtering materials. Several approaches for oil and water separation are compared. Furthermore, the principle and application scope of each method are introduced.

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Preparation and characterization of quaternary bacterial cellulose composites for antimicrobial oil‐absorbing materials

Men,

Yang,

Yang

et al. 2023

J of Applied Polymer Sci

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The treatment of various types of oily wastewater is paramount for environmental protection. Bacterial cellulose (BC) stands out as a highly promising material for oil/water separation, owing to its exceptional mechanical properties and three‐dimensional porous structures. However, excessive hydroxyl groups on BC make it highly hydrophilic, reducing oil absorption and promoting bacterial growth, affecting its stability. To address these challenges, we developed a straightforward in situ polymerization method for the preparation of BC‐DMC composites. The innovation lies in the concurrent enhancement of BC's hydrophobicity and antimicrobial properties only through the addition of 2‐(Methacryloyloxy)ethyltrimethylammonium chloride (DMC), considerably simplifying the synthesis of materials possessing oil‐absorbing and antimicrobial properties. Morphological and structural characterization results confirmed the successful combination of DMC onto BC while maintaining its porous structure. After process parameter optimization, the BC‐DMC composites exhibited a remarkable increase in contact angle (117.7° compared with pure BC's 19.5°). It also demonstrated excellent oil absorption performance, with maximum capacities exceeding 30 g/g for different oils, maintaining values above 20 g/g even after eight cycles. In addition, the BC‐DMC composites exhibited strong antibacterial activity, with rates of 82.4% against Escherichia coli and 97.5% against Staphylococcus aureus. The antibacterial mechanism of the BC‐DMC composites was also discussed. Our novel BC‐DMC composites provides excellent oil absorption and antibacterial properties, making it highly applicable in the field of oily wastewater treatment and serving as a valuable reference for other researchers.

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A review of 3D superhydrophilic porous materials for oil/water separation

Cited by 13 publications

References 172 publications

Laser Manufacturing of Superwetting Oil–Water Separation Materials: A Review

Laser Manufacturing of Superwetting Oil–Water Separation Materials: A Review

Nanostructure-Based Oil–Water Separation: Mechanism and Status

Preparation and characterization of quaternary bacterial cellulose composites for antimicrobial oil‐absorbing materials

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