Environmental Science-Nano
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2019
·Vol. 6
·期 12
·3699-3711
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IF 7.704
Wenjing Ma,Mengjie Zhang,Yuansheng Li,Mengmeng Kang,Chaobo Huang,Guodong Fu
One of the most pervasive environmental issues is water contaminated with various oils. Developing an efficient and novel functional membrane for oil/water separation is urgently needed. Herein, a flexible, durable and magnetic pH-responsive F3O4/MA–TiO2/PI electrospun nanofibrous membrane (ENM) was fabricated via an electrospinning and green dip-coating route. Combining the rough hierarchical structure and pH-responsive wettability, the as-prepared hybrid membrane can controllably separate a range of not only heavy oil/water but also light oil/water mixtures by only adjusting the pH of the aqueous medium. Both separations exhibit a large flux and outstanding efficiency for the tested oil/water mixtures even after 20 reuse cycles due to the hierarchical structure and flexibility of the membrane. In addition, the flexibility and magnetism of the membrane make it easily removed with a magnet after the separation of the oil/water mixtures. More importantly, the as-prepared membrane not only has excellent stability towards high temperature, corrosive organic solvent/salt solution immersion, and UV irradiation but also shows great resistance to mechanical abrasion and ultrasonic treatment, and the preparation method is facile, environmentally friendly, and cost-effective. Thus, such a membrane may offer exciting opportunities in the application of oily wastewater treatment and on-demand oil/water separation.
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PROGRESS IN ORGANIC COATINGS
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2019
·
IF 3.42
Dandan Zhao,Mingwang Pan,Jinfeng Yuan,Hui Liu,Shaofeng Song,Lei Zhu
s Although recent progress has been made in the development of superamphiphobic fabrics, durability has been an obstacle to their wide application in practice. In this work, a robust water-borne superamphiphobic coating was successfully prepared using poly(vinylidene fluoride) (PVDF) latex particles (225 nm) modified with a cationic fluorocarbon surfactant (Zonyl 321) and an fluoroalkylsilane (FAS). It is demonstrated that the superamphiphobic coating could strongly adhere to various substrates (fabric, sponge, wood, and filter paper) to efficiently repel water and hexadecane under harsh environments such as strong ultraviolet (UV) irradiation, abrasion, plasma cleaning, boiling water, and strong acid/base corrosion. Furthermore, this coating could exhibit good thermal healing capability upon thermal annealing. Through a thorough study of the self-assembly structure of the composite PVDF/Zonyl 321/FAS particles, the robust superamphiphobic property was considered to relate to the following reasons. First, PVDF latex particles provided nanoscale roughness and good UV/chemical resistance. Second, cationic Zonyl 321 self-assembled onto negatively charged PVDF latex particles to form a shell structure with inner fluoroalkyl groups protected by the outer positive charges, which could provide strong adhesion to various fabrics. Third, FAS self-assembled into the fluoroalkyl shell and subsequent self-condensed to render a lightly crosslinked structure. After forming a dense coating onto a substrate, further crosslinking via self-condensation of FAS provided robustness for the coating. Subsequent thermal annealing at 130 °C drove the fluoroalkyl side chains to accumulate at the top surface for superamphiphobicity. This understanding of the composite PVDF/Zonyl 321/FAS system will help us design even better superamphiphobic coatings in the future.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Ting Ying,Jiafei Su,Yijing Jiang,Qinfei Ke,He Xu
In this work, a pre-wetting induced superhydrophilic/superlipophilic micro-patterned membrane with surface-loaded BiVO 4 nanoparticles (Bi/PDA@PT) was successfully prepared by electrospinning and polydopamine (PDA) surface modification technology for highly efficient emulsified oily wastewater separation. The results showed that the as-prepared membranes exhibited micro hole-patterned structures and the BiVO 4 nanoparticles were uniformly deposited on the surfaces of fibers to construct hierarchical porous structures by using PDA as an adhesive polymeric bridge. During the separation process of emulsified oily wastewater, the hierarchical porous structures in membranes significantly improved the separation flux, which was nearly 2–3 times than that of the non-patterned membranes. Based on the existence of PDA, the membranes exhibited prewetting-induced superoleophobicity under water and superhydrophobicity under oil, which made it possible for them to separate both water-in-oil and oil-in-water emulsified oily wastewater selectively and efficiently. Moreover, the BiVO 4 nanoparticles loaded on the membranes could degrade the oily contaminants adsorbed on the membranes (nearly 100%) under visible light. All these attractive features demonstrate that the Bi/PDA@PT membranes show a great potential for sustainable and efficient emulsified oily wastewater separation.
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高影响因子
RSC Advances
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2019
·Vol. 9
·期 45
·26165-26171
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IF 3.049
Shengyang Pan,Min Chen,Limin Wu
Although superomniphobic surfaces have attracted extensive interest owing to many important applications, successful fabrication of such surfaces still remains a critical challenge. Herein, we present a flexible transparent superomniphobic polydimethylsiloxane (PDMS) surface with a micropillar array using Si nanowires as the mould. The as-obtained PDMS not only exhibits excellent liquid-repellent performance with a static contact angle of over 150° and sliding angle of less than 6° against a wide range of liquids, but also maintains the super-repellency even under acid/base corrosion, mechanical damage, and unidirectional stretching.
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CELLULOSE
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2018
·Vol. 25
·期 6
·3533-3544
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IF 3.809
Yang Jin,Xia Yunfei,Xu Peng,Chen Beibei
Abstract To overcome the poor mechanical properties of biomass aerogels in oil/water separations, three different freeze-casting methods were used including direct freezing, unidirectional freezing, and bidirectional freezing with sodium alginate (SA) aerogels reinforced with cellulose nanofibrils (CN). After chemical crosslinking and silane modification, compression testing revealed that the SA/CN aerogels with parallel lamellar microstructures prepared by bidirectional freezing exhibited super-elasticity with the minimal energy dissipation of ~ 0.04 in each cycle, a maximum compressive stress of 80.4 kPa, and minimal plastic deformation at ~ 4.15%. Additionally, the water and oil contact angle of the surface of the lamellar SA/CN aerogel was 148.7° and 0°, respectively. By combining the super-elasticity and hydrophobicity/superoleophilicity, the lamella SA/CN aerogels could be reused for the separation of oil/water mixture with oil absorption capacities up to 34 times its weight. Furthermore, the lamellar SA/CN aerogel could continuously separate oil/water mixtures with the assistance of a pump. Therefore, the present study offers a simple and environmentally friendly method for fabrication of super-elastic and hydrophobic/superoleophilic biomass aerogels that are applied to continuous removal of oil from water. Graphical Abstract
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ACS Sustainable Chemistry & Engineering
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2018
·
IF 6.14
Nan Li,Wei Chen,Guangxue Chen,Xiaofang Wan,Junfei Tian
The use of natural materials to solve environmental problems is intended to decrease the burden on the global environment. In this paper, we describe a natural, repeatable, and low-cost method for terminating methane bubbles under water before they release into the atmosphere. A cellulose aerogel with porous structure and large surface area was fabricated via combining a dry pulp disintegration process with freeze-drying. The aerogel became superhydrophobic after it was modified with methyltrimethoxysilane (MTMS); therefore, it was able to effectively collect and store transport methane bubbles under water. The hydrophobic cellulose aerogel (HCA) exhibited exceptional performance for collecting methane bubbles under both static and dynamic absorption-release conditions. We hope this work will inspire alternative methods for the exploitation and elimination of environmental methane with the potential to alleviate global warming.
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ACS Sustainable Chemistry & Engineering
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2018
·
IF 6.14
Ri-Long Yang,Ying-Jie Zhu,Fei-Fei Chen,Dong-Dong Qin,Zhi-Chao Xiong
The frequent occurrence of oil spilling and industrial oily wastewater have serious negative effects on the marine ecosystem and human health. For this reason, high performance, effective, and continuous oil adsorption materials are highly desirable. Herein, a new kind of recyclable, magnetic, fire-retardant, and superhydrophobic large-sized paper based on environmental friendly inorganic ultralong hydroxyapatite nanowires is reported. The ultralong hydroxyapatite nanowires not only act as building blocks for binding magnetic nanoparticles and coating a polydimethylsiloxane layer to form the free-standing composite paper but also endow the paper with high thermal stability, excellent fire resistance, porous structure, and high permeation flux. Moreover, the scaled-up production of ultralong hydroxyapatite nanowires and a large-sized composite paper has been demonstrated. The as-prepared composite paper exhibits a high separation selectivity (>99.0%), high permeation flux (2924.3 L m–2 h–1), and good recycling ability (at least 10 times). More importantly, a mini-boat made from the composite paper acting as an oil-collecting device is fabricated for continuous oil collection. The mini-boat can be magnetically driven to the oil-polluted region, and the selective collection, convenient transportation, and recovery of oil from water are achieved. The oil-collecting device shows a high separation efficiency (>99.2%) and good reusability (at least 10 times). The present work may inspire the development and application of high-performance paper-based oil-collecting devices for continuous oil/water separation and oily contaminant collection in the field of oily wastewater treatment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Shudi Zhi,Gang Wang,Zhixiang Zeng,Lijing Zhu,Zhixiong Liu,Dawei Zhang,Kaile Xu,Qunji Xue
The superamphiphobic surfaces with extreme repellency to liquids are very attractive in many fields, but their fabrication processes are always low effective and expensive. So it is still a challenge to create the superamphiphobic surfaces by simple, time saving and universal method. In this work, the mossy zinc (Zn) filaments, a promising re-entrant structure, was rapidly constructed on various metal surfaces by electrochemical deposition approach. After modification by 1H,1H,2H,2H- perfluorodecyltrichlorosilane (PFDTCS), the Zn@PFDTCS coating exhibited superamphiphobicity in air. The correlation between the morphology of Zn filaments and electrochemical deposition parameters has been studied. The superamphiphobic surface with contact angle higher than 154°, sliding angle lower than 5° and adhesive force lower than 0.043 mN to water and hexadecane was obtained, when the current density was 1.78 A ·dm −2 , the mass fraction of zinc was 0.71 wt% and the deposition time was 40 min. Furthermore, the Zn@PFDTCS 2D-meshes were used to collect oil droplets under water and cut water droplet in oil due to their superoleophilicity under water and superhydrophobicity under oil. We anticipated that the simple and rapid method guides the design of perfect artificial superamphiphobic surfaces in practical application.
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JOURNAL OF MEMBRANE SCIENCE
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2018
·
IF 6.578
Linli Tan,Na Han,Yongqiang Qian,Haoran Zhang,Hongkun Gao,Longfei Zhang,Xingxiang Zhang
A novel superhydrophilic and underwater superoleophobic poly (acrylonitrile-co-methyl acrylate) (P(AN-MA)) microfiltration membrane (MF) was processed. In order to create micro/nanostructured roughness surface and improve the hydrophilicity of the membranes, the thermally induced phase separation (TIPS) method combined with surface hydrolysis reaction method were adopted. The obtained membrane is noted for symmetrical and hierarchical micro/nano-structure with excellent superhydrophilicity and underwater superoleophobicity. It can efficiently separate surfactant-free and surfactant-stabilized oil-in-water emulsions with ultrahigh water fluxes, which is up to 4341 L/m 2 h under a low operating pressure (0.02 MPa). The oil content in the filtrate is below 5 ppm after one time separation, showing significant applicability for energy-saving filtration. In addition, the hydrolyzed PAN-based membrane has superior antifouling property and unconspicuous oil adhesion property, which is noted for excellent reusability. This work provides a simple and green technology to fabricate superhydrophilic PAN-based MF membrane for highly efficient separation of oil-in-water emulsions.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 4
·3648-3660
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IF 2.993
Liao Xiaofeng,Li Hongqiang,Su Xiaojing,Zhan Haomiao,Lai Xuejun,Zeng Xingrong
With the deteriorating environmental pollution by oil spill accidents and industrial sewage emissions, stimuli-responsive superwettable materials have been of considerable interest for its intriguing application in oil–water separation. Herein, we report a facile room temperature method to fabricate mussel-inspired cotton fabric with pH-responsive superwettability, by combining in situ generation of silver particles to construct roughness with self-assembly of long alkyl thiols terminated with methyl and carboxyl groups to endow hydrophobicity and responsiveness. The fabricated pH-responsive cotton fabric showed superhydrophobicity with water contact angle (WCA) up to 153° under acidic and neutral conditions while superhydrophilicity with WCA at 0° under alkaline condition. Importantly, the cotton fabric was successfully applied in bidirectional oil–water separation, exhibiting high separation efficiency and excellent reversibility. Furthermore, the pH-responsive cotton fabric also demonstrated superior self-cleaning property and antibacterial activity to E. coli and S. aureus . Our method to construct pH-responsive cotton fabric is simple, and no special techniques, chemicals or control of atmosphere is required. Our findings conceivably stand out as a new tool to fabricate functional superwettable materials and surfaces with responsiveness to external stimuli for various oil-pollution treatments and other potential applications.
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Small
·
2019
·Vol. 15
·期 31
·1901888
·
IF 10.856
Bin Shang,Min Chen,Limin Wu
Tunable underwater oil adhesion is a critical issue in interfacial science and industrial applications. Although much progress has been made to date, development of novel smart coating materials that can selectively change the wetting property at different areas is considerably scarce. Here, a simple strategy is proposed to fabricate photothermal responsive coatings, which can change the oil adhesion behavior from low-adhesive rolling state to high-adhesive pinning state for a variety of oily liquids in a remote, local, and reversible manner. Owing to this unique controllability, the adhesion and no-adhesion of oil droplets on the coated surfaces can be easily manipulated by remote and local near-infrared radiation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Maiping Yang,Weiqu Liu,Chi Jiang,Chunhua Liu,Sha He,Yankun Xie,Zhengfang Wang
A facile and mild dip-coating method of fabricating superhydrophobic coating for cotton textiles was proposed. Cotton fabric was treated with TiO2 sol prepared under mild conditions and subsequently dip-coated by fluoropolymer (PHM). The PHM was synthesized by copolymerization of hexafluorobutyl methacrylate (HFBMA) and 3-methacryloxypropyltrimethoxysilane (MPS) to replace long-chain fluoroalkylsilanes, which are costly and potentially harmful. The coated textile displayed wonderful superhydrophobicity with a water contact angle of 153.5°. Additionally, the stability of the coated textile was tested by placement in acidic and alkali solutions, ultrasonic processing, and washing, during which it exhibited desirable durability. Furthermore, the surface showed an excellent biomimetic self-cleaning effect of removing both liquid pollutant and solid powder stains. Importantly, the prepared textile exhibited efficient oil–water separation for its superhydrophobicity and superoleophilicity. These advantages make it an ideal material for large-scale industrial applications under various conditions.
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危险品化学品经营许可证（带存储）