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Fabrication of oila??water separation copper filter by spatial light modulated femtosecond laser
摘要： Surface with oil-water separation performance has attracted more and more attention in the application of oil-containing wastewater purification. Much related work has been done by many researchers. However, there are still many difficulties in rapid manufacturing of filter membranes with special wettability. In this paper, an efficient, flexible method to fabricate microporous arrays by using femtosecond (fs) laser combined with spatial light modulator (SLM) is proposed. The laser treated copper sheet surface shows hydrophobic and superoleophilic properties due to the microstructure. Meanwhile, the array of micro-through-holes on the surface can allow oil to penetrate through holes and prevent water from penetrating. The manufacturing process is not only extremely efficient, 10×10 focus array are used in the ablation, but also it is without chemical method and the filter presents a long-term stable hydrophobic and superoleophilic performance.
关键词： Superoleophilic,Oil-water separation,Hydrophobic,Spatial light modulator,Femtosecond laser
更新于2025-09-23 15:21:01
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Heterostructured PPy/ZnO layer assembled PAN nanofibrous membrane with robust visible-light-induced self-cleaning for high efficient water purification with fast separation flux
摘要： Developing superhydrophilic/underwater superoleophobic surface to restrict oil pollution from oil/water separation process has been an effective method. However, inevitable adsorption and aggregation of organic contaminants onto membrane surface from complex oily sewage usually caused irreversibly decrease of flux, injurie of anti-oilfouling and shorten lifespan for separation membrane. Thus, a neoteric antifouling and renewable membrane is high desired. Herein, based on stabilized PAN nanofibers and followed assembled heterostructured PPy/ZnO layer with hierarchical structures onto the nanofibers surface, we reported a robust visible-light-induced self-repairable oil/water separation membrane. The SPAN-PPy/ZnO membrane displays superhydrophilicity (≈0°) and underwater superoleophobicity (>150°) for different oils, robust mechanical strength (≈408 MPa of Young’s modulus) and underwater high oil intrusion pressure (>120 kPa). Importantly, the as-prepared membrane not exhibits ultrafast permeation flux and high separation efficiency for oil/dyes/water emulsion, but also displays robust recovery ability (96%) after organic-polluted after 20 min light irradiation. We anticipate this composite membrane with outstanding separation capablity and robust flux recovery capable can provide a novel method for treation the large volume of wastewater purification.
关键词： heterostructured PPy/ZnO,visible-light-induced self-cleaning,superhydrophilic,underwater superoleophobic,oil/water separation
更新于2025-09-19 17:13:59
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High-performance oil-water separation polytetrafluoroethylene membranes prepared by picosecond laser direct ablation and drilling
摘要： The membranes with special surface wettability have attracted considerable attention, especially in the practical applications of oil-water separation. Here, we presented a simple and rapid method of picosecond (ps) laser direct ablation and then drilling to fabricate high-performance oil-water separation polytetrafluoroethylene (PTFE) membrane. It was found that the as-prepared rough PTFE membranes had ca. 0° contact angle (CA) of oil in air and above 150° CAs of water in air or oil, respectively, exhibiting superoleophilicity and under-oil superhydrophobicity. The micropore size of the membranes was less than ca. 180 μm, the corresponding separation efficiencies were over 99.0% for different oil-water mixtures due to the special and rough surface microstructures. Importantly, the separation efficiencies and fluxes of the as-prepared membranes showed no obvious change with suffering heavy erosion or 40 separation cycles, indicating that the membranes had excellent stability and applicability. Additionally, the effect of the special and rough surface on oil-water separation performance was investigated. This work provides a new pathway for the rapid fabrication of high-performance separation membranes.
关键词： Picosecond laser ablation,Superoleophilicity,Polytetrafluoroethylene,Superhydrophobicity,Oil-water separation
更新于2025-09-12 10:27:22
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Biomimetic Hierarchical TiO <sub/>2</sub> @CuO Nanowire Arrays-Coated Copper Meshes with Superwetting and Self-Cleaning Properties for Efficient Oil/Water Separation
摘要： Creating a practical and energy-efficient method with high efficiency to separate oil–water mixtures and emulsions is essential for sustainable aquatic ecosystem and waste oil recycling. Herein, we reported a completely inorganic hierarchical TiO2@CuO nanowire array-coated copper mesh membrane fabricated using chemical oxidation and hydrothermal recrystallization. The biomimetic hierarchical nano-/micro-structure can form a lotus-leaf-like interface with fine surface roughness and hydration ability, thus endows the membrane superhydrophilic and underwater superoleophobic nature. Thus, the as-synthesized TiO2@CuO nanowire array-coated copper mesh membrane demonstrated promising water flux of 87.6 kL·h-1·m-2 and ultrahigh separation efficiency with oil residue of only 12.4 mg·L-1 in the permeate. Moreover, the uniformly immobilized TiO2 nanoparticles exhibit UV-irradiated photocatalytic ability, which can be effectively regenerate the contaminated membrane after exposure to UV irradiations for 60 min. Therefore, this high efficiency, reusable, and easy-scalable membrane fabrication strategy may possess practical potential for next-generation oil/water separation application.
关键词： Biomimetic morphology,self-cleaning,nano-/micro- hierarchical structure,oil/water separation
更新于2025-09-04 15:30:14