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Feng Zhang Wen Bin Zhang Zhun Shi Dong Wang Jian Jin Lei Jiang 《Advanced materials (Deerfield Beach, Fla.)》2013,25(30):4192-4198
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《Advanced Materials Interfaces》2017,4(21)
Functional surfaces with specific wettability are widely encountered in nature and have inspired the development of oil‐repellent materials for oil/water separation. Despite some impressive results reported, materials combining high separation efficiency together with economical and easily scalable approaches and ideally based on renewable resources have yet to be reported. In this Communication, spruce (Picea abies ) wood cross sections are proposed as oil/water separation systems. The natural wood anisotropic porous microstructure directs fluid transport, and the nature of the cell wall biopolymers results in superhydrophilicity and underwater superoleophobicity. Such wood membranes can separate water from oil with high efficiency (>99%) and high flux using only gravity and without the need for prior chemical modification of the wood scaffold. Wood also provides an intrinsic solution to scalability issues. 相似文献
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工业含油废水的大量产生和漏油事故的频发,促使高效处理含油废水成为全球性问题。通过浸渍法将聚多巴胺(Polydopamine,PDA)和埃洛石纳米管(Halloysite nanotubes,HNTs)原位沉积在不锈钢网上,制备了超亲水/水下超疏油滤网(PDA-HNTs/SSM)并用于油水分离。利用SEM、EDS、FTIR、XRD、XPS和接触角仪表征了改性不锈钢网的表面形貌、化学组成和润湿性。结果表明,通过调整PDA与HNTs的浸渍周期可控制材料的润湿性和表面微/纳复合结构,10个浸渍周期得到的PDA-HNTs/SSM的超亲水性/水下超疏油性能最优,水下二氯甲烷接触角大于157°,滑动角小于5°。分别采用二甲苯、环己烷、正己烷、石油醚和二氯甲烷进行油水分离测试,PDA-HNTs/SSM的分离效率均大于99%,经50次循环使用后其分离效率在95.5%以上,且在浓度为1 mol/L的HCl、NaOH和NaCl溶液中静置7天或经砂纸摩擦10 m后,仍保持稳定的水下超疏油性和良好的油水分离能力。 相似文献
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Xi Zheng Zhenyan Guo Dongliang Tian Xiaofang Zhang Lei Jiang 《Advanced Materials Interfaces》2016,3(18)
Smart surfaces with responsive wettability to external stimulus have attracted considerable attention especially in oil/water/solid interface, whereas there still remain challenges of response in situ, low voltage, and stable substrate. Here, a strategy is proposed to achieve the electric field induced water selectively permeation for oil/water separation based on the stainless steel mesh coated with root‐like polyaniline nanofibers fabricated by emulsion polymerization. Such micro/nanoscale hierarchical‐structured polyaniline mesh is superhydrophobic and underwater superoleophobic, while its superhydrophobicity can turn to hydrophilicity at 160 V and can further selectively filter water at 170 V. As a result, the electric field induced oil/water separation is realized as long as the electric capillary pressure (ECP) is larger than the hydrostatic pressure of the membrane to water, i.e., ECP induced wettability to water transition. The mesh shows low underwater oil‐adhesion force and the anti‐corrosion of polyaniline, indicating that the mesh could keep working under severe environment during the practical application. Thus, this work is promising in the application of controllable oil/water separation and will also be beneficial to the study of smart filtration, microreactors, and microfluidic devices. 相似文献
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石油化工和机械制造等领域普遍存在含油污水,直接排放不仅浪费水、油资源,污染生态环境,还影响人类与其他生物的生存与健康。传统的油水分离方法局限性强、经济性差、分离效率不高。以316不锈钢丝网为基底,研发了耐长期水泡与耐油污染的超亲水水下疏油网膜,通过优选水性丙烯酸与水性环氧清漆共混树脂作为粘结剂,对基底采用植酸预处理,采用一步喷涂法制备出了纯水性涂层涂覆的超亲水水下疏油网膜。对不同含油污水的分离效率均能够达到98%以上,水通量能够达到14000 L/(m2·h·bar) 以上,耐油压为4.65 kPa。循环分离正己烷污水50次后,网膜的分离效率仍然能够达到98%以上。耐水泡180天后仍保持超亲水性及6500 L/(m2·h·bar)以上的水通量。添加微量表面活性剂十二烷基硫酸钠后,经过50次污染-清洗循环后网膜的水通量衰减＜50%。这一研究为精细化含油污水处理领域超亲水分离网膜的研发与制备提供了一定借鉴与技术参考。 相似文献
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Zhongjun Cheng Chong Li Hua Lai Ying Du Hongwei Liu Min Liu Kening Sun Liguo Jin Naiqing Zhang Lei Jiang 《Advanced Materials Interfaces》2016,3(17)
Recently, superwetting films for separating oil/water emulsions have gained much interest due to their remarkable advantages such as high efficiency and high flux. Until now, although a lot of superhydrophobic/superoleophilic and superhydrophilic/underwater superoleophobic films have been prepared for separation of water‐in‐oil and oil‐in‐water emulsions, respectively, smart films that can separate both the types of emulsions are still rare, especially a general rule in designing such a smart bidirectional separating film is still a challenge. Herein, a new design strategy is advanced and a novel smart nanostructured copper mesh film is reported, on which both the water‐in‐oil and oil‐in‐water emulsions can be separated with high efficiency and high flux. The special separating ability can be ascribed to the combined effect of nanoscale pores on the film and the tunable wettabilities, which can switch reversibly between the superhydrophobic/superoleophilic and superhydrophilic/underwater superoleophobic states. This paper reports a smart recycled separating film for oil/water emulsions and displays particular bidirectional separating performances. The reported design concept is so simple that can easily be extended to many other smart materials and can open up some new perspectives for the fabrication of novel oil/water separating materials. 相似文献
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Despite extensive progress in the development of robust artificial membranes addressing the oil pollution issue, the current solutions are susceptible to limited functionalities, such as inability to separate small emulsions and poor resistance to notorious biological contaminants and fouling as a result of the complexity in their operating environments. Here a facile one‐step approach is reported to engineer a novel composite membrane that spans a wide range of functional properties. By tailoring the surface structure, chemical composition, and harnessing the synergistic cooperation of nonadhesion ability of polyethylene glycol (PEG) and silver nanoparticles embedded in the PEG matrixes (PEG‐Ag NPs membrane), the designed membrane allows for high separation efficiency (>99.9%) in a wide range of operating conditions, as well as enhanced antimicrobial and antimarine fouling activities. It is anticipated that the facile fabrication and multifunctional performances will bring this membrane a step closer to practical applications including the clean‐up of oil spills, waste water treatment, fuel purification, and the separation of commercially relevant emulsions. 相似文献
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《Advanced Materials Interfaces》2017,4(7)
The development of antifouling surfaces to prevent bioattachment is an urgent demand for marine coating and biomedical applications. In this paper, two types of anionic and zwitterionic gel fibers are synthesized based on anodic aluminum oxide (AAO) substrate and their antifouling properties against oil and algal attachment are systematically investigated. To begin with, gel surfaces exhibit underwater superoleophoic property and extremely low oil adhesion. The effect of electrolyte on underwater wetting behavior is studied. It is shown that the adhesion of oil droplets on gel fibers significantly increase upon immersing in electrolyte solutions and ionic surfactants, which could be attributed to electrostatic screening effect of salt solution and ion‐pairing interaction. Notably, in regard to Dunaliella tertiolecta and Navicula sp., almost 90% and 95% decrease of fouling algae density are achieved for P(AA/SPMA) and P(AA/SBMA) gel fibers, respectively, comparing with AAO substrate for control. The excellent antifouling property and high structural stability of gel fibers make them effective antifouling surfaces. 相似文献
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《Advanced Materials Interfaces》2017,4(10)
Recently, large quantities of oily wastewater discharged from our daily life and industries have caused serious environmental problems. In addition, frequent oil spill accidents occurred all over the world have also lead to a waste of precious resources. Oil/water separation has become a worldwide challenge for us to overcome. Nowadays, superwetting materials have attracted considerable attention. Among them, porous materials with special wettability are more popular since this kind of materials is easy to fabricate, cost saving and time saving. Moreover, by combining the design of special wettability with the proper pore size, the porous materials could achieve the separation of sundry oil/water mixtures including immiscible oil/water mixtures and stabilized emulsions. In this review, we summarized two types of superwetting porous materials for immiscible oil/water mixtures separation and emulsion separation: water blocking porous materials with superhydrophobic/superoleophilic wettability and oil blocking porous materials with superhydrophilic/underwater superoleophobic wettability. In each type, we introduce the mechanism, fabricating process, effects of oily wastewater treatment and the representative works in detail. Moreover, the smart controllable superwetting porous materials and the wastewater treatment of other pollutants are also introduced briefly. 相似文献
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Tian‐Di Pan Zong‐Jie Li Da‐Hua Shou Wan Shou Jin‐Tu Fan Xuqing Liu Yong Liu 《Advanced Materials Interfaces》2019,6(21)
Water pollution, such as marine oil spill and organic chemicals pollution, is a worldwide challenge. To advance this emerging field, Janus membranes with asymmetric wettability, for oil–water separation, similitude of diode in electrocircuit, are fabricated by leveraging the buoyancy of poly(vinylidene fluoride) nanofiber on water/air interface. ZnO nanowires are in situ grown on the surface of nanofibers immersed in the solution, mimicking a nanoscale Setaria viridis structure. Such Janus membrane shows a good hydrophilicity/underwater oleophobicity on ZnO nanowires modified side and exhibits opposite hydrophobicity on the other side. Due to the side‐specific morphologies, this membrane can work either as “water‐removing” type or “oil‐removing” type filter as a diode in fluid. The membrane shows excellent permeability with the water and oil flux up to 1210 and 7653 L m−2 h−1, respectively, only driven by gravity. The durability of functional membrane is excellent and separation efficiency is higher than 97.24% after ten cycling tests. Furthermore, the hydrophilic side demonstrates an excellent photocatalytic performance over the degradation of rhodamine B dye, as self‐cleaning properties. This Janus membrane is to be an excellent candidate for wastewater remediation, both oil/water separation and organic pollutant decomposition. 相似文献
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Ultralight sponges with the ability to release protons on demand, namely, superhydrophobic melamine formaldehyde sponges (SHpho‐MFSs), which are characterized as being safe‐to‐handle, convenient‐to‐use, easy‐to‐store, easy‐to‐carry, and easy‐to‐collect, are switched from superhydrophilic MFSs (SHphi‐MFSs) by a one‐step ultrasound treatment at a low pH. The wettability of the SHphi‐MFS is completely switched from the outside to the inside of the MFS. After wettability switching is achieved, the SHpho‐MFS that is prewetted with water and oil is able to selectively separate both water and oil, respectively. A compressed SHpho‐MFS also exhibits excellent separation performance of a water‐in‐oil emulsion. Furthermore, since the SHpho‐MFS can linearly release protons in an aqueous solution, during the oil/water separation (water‐removing), an aqueous solution of a strong base is neutralized or changed into a certain solution with a tailored pH by a simple filtration step using an appropriately sized SHpho‐MFS. The SHpho‐MFS can maintain a slow reaction rate and reduce the sudden release of heat during neutralization. Controlled release of the SHpho‐MFS capable of the ordered production of protons on demand is also achieved because the release “on and off” behavior of protons is repeatedly observed for every cycle. 相似文献
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Jian Li Long Yan Xiaohua Tang Hua Feng Dongcheng Hu Fei Zha 《Advanced Materials Interfaces》2016,3(9)
Removal of oil from water has become an increasingly important field due to the frequent oil spill accidents as well as industrial oily wastewater. In this study, a bag is made from superhydrophobic fabric and stuffed with pristine polyurethane (PU) sponge just utilizing the synergetic effect of the superhydrophobic and superoleophilic selective absorption of oil from water of the fabric and the excellent large volume‐based oil storage capacity of the PU sponge. The superhydrophobic filling bag can quickly absorb and collect a large amount of oil from a polluted water surface with the separation efficiency always above 98.2% for a series of oil/water mixtures. In addition, the filled orignial sponges exhibit large volume‐based absorption capacity up to 20–36 times its own weight, keeping nearly the same absorption capacity with the previous reported hydrophobic modified sponges. Furthermore, the superhydrophobic bag filled with PU sponges can continuously and efficiently absorb oils from water surfaces with high‐speed, removing about 40 L of kerosene in 150 min under a continuous vacuum regime. Moreover, the as‐prepared superhydrophobic filling bag also shows high selectivity and excellent oil storage stability; and no oil escapes from the bag even under harsh conditions, including strong acidic, alkaline, salt aqueous solutions, hot water, and mechanical abrasion. 相似文献