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Functional polymer coating on glass-fiber fabric for de-emulsification and coalescence of water-in-oil emulsion. REACT FUNCT POLYM 2023. [DOI: 10.1016/j.reactfunctpolym.2022.105487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Li X, Yang Z, Peng Y, Zhang F, Lin M, Zhang J, Lv Q, Dong Z. Wood-Inspired Compressible Superhydrophilic Sponge for Efficient Removal of Micron-Sized Water Droplets from Viscous Oils. ACS APPLIED MATERIALS & INTERFACES 2022; 14:11789-11802. [PMID: 35195410 DOI: 10.1021/acsami.2c00785] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Efficient micron-sized droplet separation materials have become a new demand for environmental protection and economic development. However, existing separation methods are difficult to be effectively used for micron-sized water droplets surrounded by viscous oil, and common materials have difficulty maintaining hydrophilicity underoil. Here, inspired by the microstructure of tree xylem, we report a cellulose-polyurethane sponge (CP-Sponge) with wood-like pores and underoil superhydrophilicity using directional freeze-casting. The CP-Sponge has an excellent selective water absorption capacity underoil and compression resilience. This preparation strategy can flexibly control the sponge's dimensional morphology. The designed cylindrical CP-Sponge can be easily installed in the silicone tube of a peristaltic pump. During pump operation, with a simple absorption, compression, and recovery process, the CP-Sponge continuously and effectively removes micron-sized water from crude oil and lubricating oil, reducing residual water in the oil to less than 2 ppm. The absorption-saturated sponge can be dried to continue recycling. Eco-friendly, recyclable, and sustainable artificial porous sponges provide new ideas and inspiration for the practical application of deep dehydration of viscous oils.
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Affiliation(s)
- Xiaochen Li
- Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, People's Republic of China
| | - Zihao Yang
- Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, People's Republic of China
| | - Ying Peng
- Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, People's Republic of China
| | - Fengfan Zhang
- Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, People's Republic of China
| | - Meiqin Lin
- Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, People's Republic of China
| | - Juan Zhang
- Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, People's Republic of China
| | - Qichao Lv
- Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, People's Republic of China
| | - Zhaoxia Dong
- Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, People's Republic of China
- School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China
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Cheng C, Wei Z, Gu J, Wu Z, Zhao Y. Rational design of Janus nanofibrous membranes with novel under-oil superhydrophilic/superhydrophobic asymmetric wettability for water-in-diesel emulsion separation. J Colloid Interface Sci 2022; 606:1563-1571. [PMID: 34500159 DOI: 10.1016/j.jcis.2021.08.164] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 08/21/2021] [Accepted: 08/24/2021] [Indexed: 12/13/2022]
Abstract
Endowing nanofibrous membranes with special wettability has always been the dominant strategy to improve the separation performance for water-in-oil emulsions. In this work, a rational design of deacetylated cellulose acetate/polyvinylidene fluoride (dCA/PVDF) Janus nanofibrous membrane, with asymmetric wettability in either air, water or diesel environment, was developed via sequential electrospinning PVDF and CA membranes followed by alkali treatment. In the process of water-in-diesel emulsion separation, the under-diesel superhydrophilic dCA layer is able to capture the emulsified water and strengthens the demulsification ability of the Janus membrane, while the under-diesel superhydrophobic PVDF layer acts as a water barrier and further improves the separation ability. The Janus membrane therefore exhibited prominent separation performance not only for the water/diesel mixture (separation efficiency 99.98%) but also for the surfactant-stabilized water-in-diesel emulsion with l vol% water (separation efficiency 97.74%). Moreover, the Janus membrane maintained high separation efficiency over 96% after repeated use for 50 times or soaking in corrosive solutions for 24 h. The Janus dCA/PVDF nanofibrous membrane possesses competitive efficiency, reusability and acid/alkali resistance, making it a promising candidate as the separation membrane for the surfactant-stabilized water-in-diesel emulsion.
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Affiliation(s)
- Chen Cheng
- College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China
| | - Zhenzhen Wei
- College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China.
| | - Jiayi Gu
- College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China
| | - Zhu Wu
- College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China
| | - Yan Zhao
- College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China.
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Coalescence separation of oil water emulsion on amphiphobic fluorocarbon polymer and silica nanoparticles coated fiber-bed coalescer. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2020.07.034] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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He L, Lei W, Liu D. One-step facile fabrication of mechanical strong porous boron nitride nanosheets–polymer electrospun nanofibrous membranes for repeatable emulsified oil/water separation. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118446] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Sun Y, Guo Z. Programming Multiphase Media Superwetting States in the Oil-Water-Air System: Evolutions in Hydrophobic-Hydrophilic Surface Heterogeneous Chemistry. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2004875. [PMID: 33463790 DOI: 10.1002/adma.202004875] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 08/26/2020] [Indexed: 06/12/2023]
Abstract
Studies toward tailoring macroscopic extreme wetting behaviors on a certain well-defined surface in multiphase media are significant but still at an infant stage. Herein, superantiwetting evolutions in the oil-water-air system can be programmed from single to quadruple superrepellence by controlling the surface hydrophobic-hydrophilic heterogeneous chemistry. Ammonia vapor exposure makes the realization of challenging superhydrophilicity-superoleophobicity possible in air medium, causing the transition from quadruple to triple superantiwetting states in the oil-water-air system. Upon UV illumination, only single superrepellence-underwater superoleophobicity is maintained on titanium dioxide (TiO2, P25)-based coatings. A reversible transition between underoil superhydrophilicity and superhydrophobicity via an alternating UV irradiation and heating process leads to a switching between "water-absorbing" and "size-sieving" effects in water-in-oil emulsion separation. A comparative study for investigating two such effects in emulsion separation is further investigated. The current conceptual insights not only extend superwetting states to multiphase media, but can also deepen the understanding of the relationship between macroscopic extreme wetting behaviors and surface chemistry.
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Affiliation(s)
- Yihan Sun
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Zhiguang Guo
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan, 430062, P. R. China
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Song Q, Kang J, Tang M, Liang Y. Separation of Water in Diesel Using Filter Media Containing Kapok Fibers. MATERIALS (BASEL, SWITZERLAND) 2020; 13:ma13112667. [PMID: 32545347 PMCID: PMC7321646 DOI: 10.3390/ma13112667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 05/27/2020] [Accepted: 06/08/2020] [Indexed: 06/11/2023]
Abstract
Traditional water-repellent filter media for water separation in diesel fail to meet requirements due to the high content of surfactants in low sulfur diesel and ULSD (ultra low sulfur diesel). To improve the water separation performance of filter media, a novel dual-layer filter medium was prepared by hydrophilic fibers (glass microfibers) and hydrophobic fibers (kapok fibers and bi-component PET fibers). The results showed that the separation efficiency of a filter medium (sample #2) with the upstream layer containing 20 wt% kapok fibers was 89.5%, which was higher than that of filter samples with the upstream layer containing 0 wt%, 40 wt%, 60 wt% and 80 wt% kapok fibers. When the interfacial tension (IFT) of water in diesel was 21 mN/m, 17 mN/m and 13 mN/m, the separation efficiency of filter sample #2 was 99.5%, 89.5% and 30.5%, respectively, which was 23.9%, 57.4% and 17.8% higher than that of the commercial water-repellent filter samples composed of a polybutylene terephthalate (PBT) fiber layer and cellulose fiber layer.
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Affiliation(s)
- Qiang Song
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Rd., Guangzhou 510640, China; (Q.S.); (Y.L.)
| | - Jian Kang
- State Key Laboratory of NBC Protection for Civilian, 35 Huayuan Rd. N., Beijing 100191, China
| | - Min Tang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Rd., Guangzhou 510640, China; (Q.S.); (Y.L.)
| | - Yun Liang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Rd., Guangzhou 510640, China; (Q.S.); (Y.L.)
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Chen C, Weng D, Mahmood A, Chen S, Wang J. Separation Mechanism and Construction of Surfaces with Special Wettability for Oil/Water Separation. ACS APPLIED MATERIALS & INTERFACES 2019; 11:11006-11027. [PMID: 30811172 DOI: 10.1021/acsami.9b01293] [Citation(s) in RCA: 208] [Impact Index Per Article: 41.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Oil leakage and the discharge of oil/water mixtures by domestic and industrial consumers have caused not only severe environmental pollution and a threat to all species in the ecosystem but also a huge waste of precious resources. Therefore, the separation of oil/water mixtures, especially stable emulsion, has become an urgent global issue. Recently, materials containing a special wettability feature for oil and water have drawn immense attention because of their potential applications for oil/water separation application. In this paper, we systematically summarize the fundamental theories, separation mechanism, design strategies, and recent developments in materials with special wettability for separating stratified and emulsified oil/water mixtures. The related wetting theories that unveil the physical underlying mechanism of the oil/water separation mechanism are proposed, and the practical design criteria for oil/water separation materials are provided. Guided by the fundamental design criteria, various porous materials with special wettability characteristics, including those which are superhydrophilic/underwater superoleophobic, superhydrophobic/superoleophilic, and superhydrophilic/in-air superoleophobic, are systemically analyzed. These superwetting materials are widely employed to separate oil/water mixtures: from stratified oil/water to emulsified ones. In addition, the materials that implement the demulsification of emulsified oil/water mixtures via the ingenious design of the multiscale surface morphology and construction of special wettability are also discussed. In each section, we introduce the design ideas, base materials, preparation methods, and representative works in detail. Finally, the conclusions and challenges for the oil/water separation research field are discussed in depth.
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Affiliation(s)
- Chaolang Chen
- Sate Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , P. R. China
| | - Ding Weng
- Sate Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , P. R. China
| | - Awais Mahmood
- Sate Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , P. R. China
| | - Shuai Chen
- Sate Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , P. R. China
| | - Jiadao Wang
- Sate Key Laboratory of Tribology , Tsinghua University , Beijing 100084 , P. R. China
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Zhang Q, Li L, Li Y, Cao L, Yang C. Surface Wetting-Driven Separation of Surfactant-Stabilized Water-Oil Emulsions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:5505-5516. [PMID: 29703077 DOI: 10.1021/acs.langmuir.7b04248] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Four fluorocarbon polymers including polytetrafluoroethylene and polyvinylidene fluoride were coated on a stainless steel felt to separate emulsified water droplets from ultralow sulfur diesel (ULSD) fuels. The original fuel treated with clay to remove additives was additized again with four known surfactants including pentaerythrityoleate, (octadecadienoic acid) dipolymer, (octadecadienoic acid) tripolymer, and monoolein individually. The different surfactants adsorbed on the fuel-water interface reduce the interfacial intension with different intensities. The separation efficiency at various surfactant concentrations was used to evaluate the coalescence effect exerted by these coatings. It was found the separation was both surfactant- and coating-dependent. A fluoro-polyurethane coating (FC1) stood out to counteract the adverse effect of all the surfactants. Solid free energy was then measured using acid-base and Kaelble-Uy adhesion theories for all the coatings, but its correlation with coalescence was not found at all. Coating aging in surfactant-additized fuel on the coating's water wettability was also examined to better understand how historical wetting affects separation. A tumbled model for fluorocarbons was identified that well-explained the continuous decline of the water contact angle on the FC1 coating in fuel. Subject to the challenge of the foreign environment, the fluoroalkyl chains of the polymer tilt to expose the carbonyl groups underneath, resulting in favored coalescence separation in the presence of surfactants.
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Affiliation(s)
- Qian Zhang
- CAS Key Laboratory of Green Process & Engineering, Institute of Process Engineering , Chinese Academy of Sciences , Beijing 100190 , PR China
- University of Chinese Academy of Sciences , Beijing 100049 , PR China
| | - Lei Li
- CAS Key Laboratory of Green Process & Engineering, Institute of Process Engineering , Chinese Academy of Sciences , Beijing 100190 , PR China
| | - Yanxiang Li
- CAS Key Laboratory of Green Process & Engineering, Institute of Process Engineering , Chinese Academy of Sciences , Beijing 100190 , PR China
| | - Lixia Cao
- CAS Key Laboratory of Green Process & Engineering, Institute of Process Engineering , Chinese Academy of Sciences , Beijing 100190 , PR China
| | - Chuanfang Yang
- CAS Key Laboratory of Green Process & Engineering, Institute of Process Engineering , Chinese Academy of Sciences , Beijing 100190 , PR China
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