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Huang H, Shi J, Pan B, Liu H, Wang D, Gao Y, Min F, Li Y, Zhou W, Chu Z. Intelligent device composed of two membranes with opposite wettability for identification and purification of both water and oil phases from oil-in-water and water-in-oil emulsions. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
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2
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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: 13] [Impact Index Per Article: 6.5] [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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Sun C, Chen K, Wiafe Biney B, Wang K, Liu H, Guo A, Xia W. Switchable wettability of grain-stacked filter layers from polyurethane plastic waste for oil/water separation. J Colloid Interface Sci 2021; 610:970-981. [PMID: 34887059 DOI: 10.1016/j.jcis.2021.11.158] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 11/23/2021] [Accepted: 11/24/2021] [Indexed: 02/07/2023]
Abstract
HYPOTHESIS Polyurethane plastic waste (PUPW), a port-abundant solid waste, is difficult to degrade naturally and poses a severe threat to the environment. Hence, the effective recycling of PUPW remains a challenge. EXPERIMENTS Herein, a strategy of converting PUPW into stacked oil/water filtration layer grain through a layer-by-layer (LBL) assembly process is investigated. Notably, such PU-based, grain-stacked, and switchable wettability of the oil/water filter layer is first reported. FINDINGS The grain-stacked filter layers are flexible for separating immiscible oil/water mixtures, water-in-oil emulsions (WOE), and oil-in-water emulsions (OWE) under gravity over 10 cycle-usages. They can withstand strong acid/alkali solutions (pH = 1-14) and salt solutions over 12 h. Besides, 100-times scale-up experiments have indicated that the obtained filter layers exhibit an upper to 98.2 % separation efficiency for 10 L real industrial oil/water emulsion in the 24 h continuous operation. The demulsification mechanism for emulsions is that the electrostatic interaction along with adsorption between emulsion droplets and grains leads to the uneven distribution of surfactants on the interface film of the emulsion droplets, increasing the probability of tiny droplets colliding and coalescing into large droplets to achieve oil/water separation. This work proposes an effective and economical method of abundant plastic waste for industrial-scale oil-water separation rather than just on the laboratory-scale.
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Affiliation(s)
- Chengyu Sun
- State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), 66 Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, China
| | - Kun Chen
- State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), 66 Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, China.
| | - Bernard Wiafe Biney
- State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), 66 Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, China
| | - Kunyin Wang
- State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), 66 Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, China
| | - He Liu
- State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), 66 Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, China
| | - Aijun Guo
- State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), 66 Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, China
| | - Wei Xia
- State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), 66 Changjiang West Road, Huangdao District, Qingdao, Shandong 266580, China
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Yan Y, Zeng X, Yang K, Zhou P, Xu S, Pi P, Li H, Fang J, Wang S, Wen X. Janus sand filter with excellent demulsification ability in separation of surfactant-stabilized oil/water emulsions: An experimental and molecular dynamics simulation study. JOURNAL OF HAZARDOUS MATERIALS 2021; 418:126346. [PMID: 34329000 DOI: 10.1016/j.jhazmat.2021.126346] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 05/15/2021] [Accepted: 06/04/2021] [Indexed: 06/13/2023]
Abstract
Developing efficient separation materials for surfactant-stabilized oil/water emulsions is of great importance while significantly challenging. In this work, a sand filter with Janus channels was prepared by simply mixing superhydrophilic and superhydrophobic quartz sand in a mass ratio of 1:1. Due to the imbalanced force of droplets in those Janus channels, better separation performance under gravity was achieved for both surfactant-stabilized oil-in-water and water-in-oil emulsions than the superhydrophilic or superhydrophobic sand filter alone. It also received high flux (1080.13 L m-2 h-1 for dichloroethane-in-water emulsion and 1378.07 L m-2 h-1 for water-in-dichloroethane emulsion) and high separation efficiency (99.80% for dichloroethane-in-water emulsion and 99.98% for water-in-dichloroethane emulsion). Molecular dynamics based computational work and experimental studies revealed that the Janus channels of mixed sand layer exhibited greater interaction energy with emulsion droplets for more efficient adsorption, resulting in better demulsification capability and separation performance. The as-prepared Janus sand filters retained excellent separation performance after 50 cycles of the stability test. Together with the needs on only cheap and easily accessible raw materials and its environmentally friendly preparation method, this Janus sand filtration process exhibits its great potential for the separation of surfactant-stabilized oil/water emulsions.
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Affiliation(s)
- Yuanyang Yan
- School of Chemical and Chemical Engineering, Guangdong Engineering Technology Research Center of Advanced Insulating Coating, South China University of Technology, Guangzhou 510640, PR China
| | - Xinjuan Zeng
- Guangdong Key Laboratory for Hydrogen Energy Technologies, School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, PR China
| | - Kangquan Yang
- School of Chemical and Chemical Engineering, Guangdong Engineering Technology Research Center of Advanced Insulating Coating, South China University of Technology, Guangzhou 510640, PR China
| | - Peizhang Zhou
- School of Chemical and Chemical Engineering, Guangdong Engineering Technology Research Center of Advanced Insulating Coating, South China University of Technology, Guangzhou 510640, PR China
| | - Shouping Xu
- School of Chemical and Chemical Engineering, Guangdong Engineering Technology Research Center of Advanced Insulating Coating, South China University of Technology, Guangzhou 510640, PR China
| | - Pihui Pi
- School of Chemical and Chemical Engineering, Guangdong Engineering Technology Research Center of Advanced Insulating Coating, South China University of Technology, Guangzhou 510640, PR China
| | - Hao Li
- School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300401, PR China
| | - Jing Fang
- School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300401, PR China
| | - Shengnian Wang
- Chemical Engineering, Center of Biomedical Engineering and Rehabilitation Science, Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71272, USA
| | - Xiufang Wen
- School of Chemical and Chemical Engineering, Guangdong Engineering Technology Research Center of Advanced Insulating Coating, South China University of Technology, Guangzhou 510640, PR China.
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Zhang R, Guo Z. Facile preparation of a superamphiphilic nitrocellulose membrane enabling on-demand and energy-efficient separation of oil/water mixtures and emulsions by prewetting. Biomater Sci 2021; 9:5559-5568. [PMID: 34236061 DOI: 10.1039/d1bm00521a] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A membrane with superamphiphilicity presents many advantages in various oil/water separation applications due to its switchable wettability by prewetting. However, it is still a great challenge to switch between two types of superwettability on a single cellulose surface by switching between different liquid media. Herein, in order to obtain in-air superamphiphilic and under-liquid dual superlyophobic membranes, dopamine-modified nitrocellulose membranes (with a pore size of 0.22 μm) were prepared via a facile immersion modification approach. Under 0.08 MPa, the as-prepared NC membrane switches wettability by prewetting to achieve on-demand oil/water separation, and the separation efficiency is more than 99.9%. Futhermore, the membrane prepared in this work can also be applied to high-efficiency on-demand separation of surfactant-stabilized emulsions with a separation efficiency greater than 99.0%. Hence, the PDA-modified NC membrane is a promising controllable oil/water separation material in terms of repeatable cycles, separation efficiency, flux, prominent long-term durability and anti-oil fouling.
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Affiliation(s)
- Rong Zhang
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science & Engineering and Hubei Key Laboratory of Polymer Materials, Hubei University, Wuhan 430062, People's Republic of China. and State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Zhiguang Guo
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science & Engineering and Hubei Key Laboratory of Polymer Materials, Hubei University, Wuhan 430062, People's Republic of China. and State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
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Yang X, Liu S, Zhao Z, He Z, Lin T, Zhao Y, Li G, Qu J, Huang L, Peng X, Liu D. A facile, clean construction of biphilic surface on filter paper via atmospheric air plasma for highly efficient separation of water-in-oil emulsions. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117672] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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He L, Long M, Miao X, Zhou Q, Dong M, Liu X, Deng W. A simple and environmental strategy to separate and purify dye-contaminated emulsion using waste porous honeycomb cinder. J DISPER SCI TECHNOL 2020. [DOI: 10.1080/01932691.2020.1847660] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Linyi He
- College of Materials Science and Engineering, South China University of Technology, Guangzhou, P. R. China
| | - Mengying Long
- College of Materials Science and Engineering, South China University of Technology, Guangzhou, P. R. China
| | - Xinrui Miao
- College of Materials Science and Engineering, South China University of Technology, Guangzhou, P. R. China
| | - Qiannan Zhou
- College of Materials Science and Engineering, South China University of Technology, Guangzhou, P. R. China
| | - Meiqiu Dong
- College of Materials Science and Engineering, South China University of Technology, Guangzhou, P. R. China
| | - Xiaogang Liu
- College of Materials Science and Engineering, South China University of Technology, Guangzhou, P. R. China
| | - Wenli Deng
- College of Materials Science and Engineering, South China University of Technology, Guangzhou, P. R. China
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Kryzevicius Z, Mickuviene K, Bucas M, Vilkiene M, Zukauskaite A. Vertical distribution of polycyclic aromatic hydrocarbons in the brackish sea water column: ex situ experiment. PeerJ 2020; 8:e10087. [PMID: 33194380 PMCID: PMC7597627 DOI: 10.7717/peerj.10087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 09/11/2020] [Indexed: 11/20/2022] Open
Abstract
Background Oil spills can cause severe damage within a marine ecosystem. Following a spill, the soluble fraction of polycyclic aromatic hydrocarbons is rapidly released into the water column. These remain dissolved in seawater over an extended period of time, even should the insoluble fraction be removed. The vertical distribution of the aromatic hydrocarbon component and how these become transferred is poorly understood in brackish waters. This study examines the vertical distribution of polycyclic aromatic hydrocarbons having been released from a controlled film of spilled oil onto the surface of brackish water. Methods The study was undertaken under controlled conditions so as to minimize the variability of environmental factors such as temperature and hydrodynamics. The distribution of polycyclic aromatic hydrocarbons was measured in the dissolved and suspended phases throughout the 1 m water column with different intensity of water sampling: 1, 2, 4, 7, 72, 120, 336, 504 and 984 h. Results The total concentration of polycyclic aromatic hydrocarbons ranged from 19.01 to 214.85 ng L–1 in the dissolved phase and from 5.14 to 63.92 ng L–1 in the suspended phase. These hydrocarbons were released immediately following a controlled spill attaining 214.9 ng L–1 in the dissolved phase and 54.4 ng L–1 in the suspended phase near the cylinder bottom after 1–2 h. The 2–3 ring polycyclic aromatic hydrocarbons dominated in the dissolved phase (60–80%), whereas the greater amount of 4–6 ring polycyclic aromatic hydrocarbons (55–90%) occurred in the suspended phase. A relatively low negative correlation (rS = –0.41) was determined between the concentration of phenanthrene and suspended matter, whereas a high negative correlation (r = − 0.79) was found between the concentration of pyrene and suspended matter. Despite the differences in the relationships between the concentration ratio and amount of suspended matter the obtained regressions allow roughly to predict the concentration of polycyclic aromatic hydrocarbons.
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Affiliation(s)
- Zilvinas Kryzevicius
- Faculty of Marine Technologies and Natural Science, Klaipeda University, Klaipėda, Lithuania
| | - Kristina Mickuviene
- Faculty of Marine Technologies and Natural Science, Klaipeda University, Klaipėda, Lithuania
| | - Martynas Bucas
- Faculty of Marine Technologies and Natural Science, Klaipeda University, Klaipėda, Lithuania
| | - Monika Vilkiene
- Vėžaičiai Branch, Lithuanian Research Centre for Agriculture and Forestry, Vėžaičiai, Klaipėda Dist., Lithuania
| | - Audrone Zukauskaite
- Faculty of Marine Technologies and Natural Science, Klaipeda University, Klaipėda, Lithuania
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Chen C, Chen S, Chen L, Yu Y, Weng D, Mahmood A, Wang J, Parkin IP, Carmalt CJ. Underoil Superhydrophilic Metal Felt Fabricated by Modifying Ultrathin Fumed Silica Coatings for the Separation of Water-in-Oil Emulsions. ACS APPLIED MATERIALS & INTERFACES 2020; 12:27663-27671. [PMID: 32431148 DOI: 10.1021/acsami.0c03801] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Although various superhydrophobic/superoleophilic porous materials have been developed and successfully applied to separate water-in-oil emulsions through the size-sieving mechanism, the separation performance is restricted by their nanoscale pore size severely. In this study, the wettability of underoil water on fumed silica was experimentally observed, and the underlying mechanism was investigated by carrying out theoretical analysis and molecular dynamic (MD) simulations. Further, we present a novel, facile, and an inexpensive technique to fabricate an underoil superhydrophilic metal felt with microscale pores for the separation of water-in-oil emulsions using SiO2 nanoparticles (NPs) as building blocks. The as-prepared underoil superhydrophilic coating is closed-packed and ultrathin (the thickness is approximately hundreds of nanometers), as well as capable of being coated on a metal felt with complex structures without blocking its pores. The as-prepared metal felt could adsorb water droplets directly from oil, which endowed it with the ability to separate both surfactant-free and surfactant-stabilized water-in-oil emulsions with high separation efficiency up to 99.7% even though its pore size is larger than that of the emulsified droplet. The filtration flux for the separation of span 80-stabilized emulsion is up to ∼4000 L·m-2·h-1. Its separation performance is better than most of the other traditional membranes and superwettable materials used for the separation of water-in-oil emulsions. Moreover, the as-prepared metal felt retained outstanding separation performance even after 30 cycles of use, which demonstrated its excellent reusability and durability. Additionally, the distinctive wettability of underoil superhydrophilicity endued coated metal felt with superior antifouling properties toward crude oil. Overall, this study not only provides a new perspective on separating water-in-oil emulsions but also gives a universal approach to develop unique wettability surfaces.
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Affiliation(s)
- Chaolang Chen
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, P. R. China
- Department of Chemistry, University of College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Shuai Chen
- Institute of High Performance Computing, A*STAR, 138632 Singapore
| | - Lei Chen
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, P. R. China
| | - Yadong Yu
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, P. R. China
| | - Ding Weng
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, P. R. China
| | - Awais Mahmood
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, P. R. China
| | - Jiadao Wang
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, P. R. China
| | - Ivan P Parkin
- Department of Chemistry, University of College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Claire J Carmalt
- Department of Chemistry, University of College London, 20 Gordon Street, London WC1H 0AJ, U.K
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Jiao Z, Chu W, Liu L, Mu Z, Li B, Wang Z, Liao Z, Wang Y, Xue H, Niu S, Jiang S, Han Z, Ren L. Underwater writable and heat-insulated paper with robust fluorine-free superhydrophobic coatings. NANOSCALE 2020; 12:8536-8545. [PMID: 32242573 DOI: 10.1039/c9nr10612j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Since its invention invented in China, paper has been widely used in the world for quite a long time. However, some intrinsic defects servely hinder its application in some extreme conditions, such as underwater or in fire. Herein, a bio-inspired durable paper with robust fluorine-free coatings was fabricated via a two-step spray-deposition technique. It not only consisted of modified SiO2 microspheres and nanoparticles, but also contained an epoxy resin, endowing the paper with multifunctional properties. First, this bio-inspired functional paper showed excellent superhydrophobic and self-cleaning properties with a high static water contact angle (WCA) of 162.7 ± 0.5° and a low sliding angle (SA) of 5.7 ± 0.6°. Moreover, it possessed unusual repellent properties toward multiple aqueous-based liquids and heat-insulated properties. Second, this paper could be used for writing underwater and maintained satisfactory superhydrophobic performance for a long time with a WCA of 153.3 ± 1.8°. Besides, its high mechanical robustness was also experimentally confirmed in harsh working conditions, such as strong acid/alkali, boiling water, abrasion, bending, and folding. Compared with conventional paper, it is anticipated that this bio-inspired functional paper would be really competitive and demonstrate great potential in the field of underwater and fire-proof applications.
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Affiliation(s)
- Zhibin Jiao
- Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130022, China.
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Wang B, Mahmood A, Chen L, Weng D, Wang C, Chen C, Li Z, Wang J. Under-oil superhydrophilic salt particle filter for the efficient separation of water-in-oil emulsions. Chem Commun (Camb) 2020; 56:11585-11588. [DOI: 10.1039/d0cc04290k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, a surfactant stabilized water-in-oil emulsion has been successfully separated by using only NaCl particles as a filter.
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Affiliation(s)
- Bao Wang
- Northeast Petroleum University
- Daqing 163318
- China
- State Key Laboratory of Tribology
- Tsinghua University
| | - Awais Mahmood
- State Key Laboratory of Tribology
- Tsinghua University
- Beijing 100084
- China
| | - Lei Chen
- State Key Laboratory of Tribology
- Tsinghua University
- Beijing 100084
- China
| | - Ding Weng
- State Key Laboratory of Tribology
- Tsinghua University
- Beijing 100084
- China
| | - Caihua Wang
- Northeast Petroleum University
- Daqing 163318
- China
| | - Chaolang Chen
- State Key Laboratory of Tribology
- Tsinghua University
- Beijing 100084
- China
| | - Zhaoxin Li
- State Key Laboratory of Tribology
- Tsinghua University
- Beijing 100084
- China
| | - Jiadao Wang
- State Key Laboratory of Tribology
- Tsinghua University
- Beijing 100084
- China
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Wang M, Zhang Z, Wang Y, Zhao X, Yang M, Men X. Durable superwetting materials through layer-by-layer assembly: Multiple separations towards water/oil mixtures, water-in-oil and oil-in-water emulsions. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.03.079] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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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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14
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Peng S, Meng W, Guo J, Wang B, Wang Z, Xu N, Li X, Wang J, Xu J. Photocatalytically Stable Superhydrophobic and Translucent Coatings Generated from PDMS-Grafted-SiO 2/TiO 2@PDMS with Multiple Applications. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:2760-2771. [PMID: 30675788 DOI: 10.1021/acs.langmuir.8b04247] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In this paper, we present a highly efficient, cost-effective, and widely applicable functionalized SiO2/TiO2-polymer based coating to fabricate a translucent, fluorine-free, chemically stable, photocatalytic active, self-healable superhydrophobic coating, which consisted of two mixed functionalized particles (MFP) and polydimethylsiloxane (PDMS) in a proper ratio. Both SiO2 and TiO2 powders were functionalized with PDMS brushes to achieve superhydrophobicity. To maximally optimize its properties, including superhydrophobicity, transparency, and photocatalytic activity, the ratios between MFP with PDMS were carefully studied and optimized. Glass slides coated with this mixed coating (MC) showed translucence with a transparency of 75%. It also presented superior photocatalytic activity and strong UV resistance that could repeatedly degrade organic oil pollutants as many as 50 times, while still maintaining superhydrophobicity even upon exposure to UV light with a high intensity of 80 mW/cm2 for as long as 36 h. When low-surface-tension oils such as dodecane wetted the MC surface, it showed excellent slippery performance and could quickly repel strong acid/alkali/hot water and even very corrosive liquids such as aqua regia. MC achieved extremely stable underoil superhydrophobicity (toward liquids including water, strong acid and base, hot water, etc.) and self-cleaning properties, not only in oils at room temperature but also in a scalded oil environment. Moreover, MC showed self-healable performance after recycled plasma treatment. The stainless steel mesh coated with MC was also used to highly efficiently separate oil-water mixtures. Moreover, harsher liquids including strong acid/alkali solutions/hot water/ice water-oil mixtures could also be successfully separated by the coated mesh. This coating was believed to largely broaden both indoor and outdoor applications for superhydrophobic surfaces.
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Affiliation(s)
- Shan Peng
- College of Chemistry and Environmental Science , Hebei University , Baoding 071002 , Hebei , China
| | - Weihua Meng
- College of Chemistry and Environmental Science , Hebei University , Baoding 071002 , Hebei , China
| | - JunXiang Guo
- Research Center for Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , China
| | - Bo Wang
- College of Chemistry and Environmental Science , Hebei University , Baoding 071002 , Hebei , China
| | - Zhenguang Wang
- College of Chemistry and Environmental Science , Hebei University , Baoding 071002 , Hebei , China
| | - Na Xu
- College of Chemistry and Environmental Science , Hebei University , Baoding 071002 , Hebei , China
| | - Xiaolin Li
- College of Chemistry and Environmental Science , Hebei University , Baoding 071002 , Hebei , China
| | - Jian Wang
- College of Chemistry and Environmental Science , Hebei University , Baoding 071002 , Hebei , China
| | - Jianzhong Xu
- College of Chemistry and Environmental Science , Hebei University , Baoding 071002 , Hebei , China
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15
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Bai W, Xu J, Guan M, He Y, Xu Y, Lin J. Preparation of superhydrophobic polyimide microstructural layer on copper mesh for oil/water separation. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2018.10.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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16
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Bai X, Shen Y, Tian H, Yang Y, Feng H, Li J. Facile fabrication of superhydrophobic wood slice for effective water-in-oil emulsion separation. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.08.010] [Citation(s) in RCA: 79] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Wang B, Peng S, Wang Y, Li X, Zhang K, Liu C. A non-fluorine method for preparing multifunctional robust superhydrophobic coating with applications in photocatalysis, flame retardance, and oil–water separation. NEW J CHEM 2019. [DOI: 10.1039/c9nj01318k] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A PDMS-grafted method was proposed to fabricate robust PDMS-grafted-Mg(OH)2/PDMS-grafted-TiO2@epoxy coatings with multifunctional properties and various promising applications.
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Affiliation(s)
- Bo Wang
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Shan Peng
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Yingchun Wang
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Xinxin Li
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Kunmeng Zhang
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
| | - Caiyun Liu
- College of Chemistry and Environmental Science
- Hebei University
- Baoding 071002
- China
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18
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Facile Fabrication of a PDMS@Stearic Acid-Kaolin Coating on Lignocellulose Composites with Superhydrophobicity and Flame Retardancy. MATERIALS 2018; 11:ma11050727. [PMID: 29751575 PMCID: PMC5978104 DOI: 10.3390/ma11050727] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 04/23/2018] [Accepted: 04/27/2018] [Indexed: 11/18/2022]
Abstract
The disadvantages such as swelling after absorbing water and flammability restrict the widespread applications of lignocellulose composites (LC). Herein, a facile and effective method to fabricate superhydrophobic surfaces with flame retardancy on LC has been investigated by coating polydimethylsiloxane (PDMS) and stearic acid (STA) modified kaolin (KL) particles. The as-prepared coatings on the LC exhibited a good repellency to water (a contact angle = 156°). Owing to the excellent flame retardancy of kaolin particles, the LC coated with PDMS@STA-KL displayed a good flame retardancy during limiting oxygen index and cone calorimeter tests. After the coating treatment, the limiting oxygen index value of the LC increased to 41.0. Cone calorimetry results indicated that the ignition time of the LC coated with PDMS@STA-KL increased by 40 s compared with that of uncoated LC. Moreover, the peak heat release rate (PHRR) and the total heat release (THR) of LC coated with PDMS@STA-KL reduced by 18.7% and 19.2% compared with those of uncoated LC, respectively. This LC coating with improved water repellency and flame retardancy can be considered as a potential alternative to protect the lignocellulose composite.
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