JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yingbo Li,Jing Ma,Hongjun Lin,Cheng Chen,Saleam Raza,Qianqian Zeng,Xinchun Lu,Liguo Shen
The development of composite membranes utilizing transition metal carbides and nitrides, exemplified by Ti 3 C 2 T x (MXene), has proven efficacious in the treatment of oily wastewater. However, challenges arise from the prolonged and convoluted transport paths within MXene interlayer nanochannels, significantly impeding mass transfer and diminishing membrane permeability. This investigation incorporated porous covalent organic frameworks (COFs) as intercalating agents into two-dimensional (2D) MXene-based membranes to expand the interlayer nanochannels. The resulting MXene@COF-TpBD functional layer polyethersulfone (PES) composite membrane exhibited a distinctive dual superoleophobic surface, concurrently manifesting underwater superoleophobicity and underoil superhydrophobicity (underwater oil contact angle >150°, underoil water contact angle >150°). The membranes exhibited excellent water flux (up to 4092.7 L m −2 h −1 ·bar −1 ), efficient oil-water emulsion separation (up to 1908.4 L m −2 h −1 ·bar −1 , rejection rates >99.78 %), noteworthy fouling resistance and structural stability, outperforming most of existing similar membranes. Furthermore, supported by the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, the incorporation of COF-TpBD improved the antifouling characteristics of the composite membrane. This work presents innovative insights into the improvement of 2D MXene membranes and the use of COF-TpBD for the specific remediation of oily wastewater.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zehao Chen,Ting Zhao,Qing Tan,Jihao Zuo,Shouping Xu,Yunjun Nong,Xiufang Wen,Pihui Pi
The crude oil spillage and large-scale industrial release of oily effluents has led to significant ecological degradation and resource wastage. Traditional superwetting materials encounter intractable challenges for treating surfactant-stabilized oil–water emulsions, including trade-off effect of permeation flux and separation efficiency, and low emulsion processing life. These issues considerably impede advancements in oil–water separation industry. In order to enhance the demulsification durability of materials while ensuring high separation efficiency and flux, this work doped perfluorooctanoic acid (PFOA) onto the modified sponge surface with superhydrophilic charged surface, and a unique in-air superhydrophilic-oleophobic sponge was prepared. This special surface allows rapid water phase permeation yet offers remarkably more stable oleophobicity compared with traditional underwater oleophobic materials when processing a large amount of emulsions. The intrinsic oleophobicity endows the sponge outstanding fouling resistance and greatly increases the one-cycle emulsion treatment amount up to 1695 L·m −2 . Moreover, the sponge's inherent long permeation channels and surface charge maintain a high separation efficiency of over 97 %. The large pores of the sponges and superhydrophilic surface provide a high permeation flux exceeding 40,000 L·m −2 ·h −1 . The sponge with high separation efficiency, flux, and capacity marks a significant advancement, offering a promising strategy for superwetting material applications in oil-in-water emulsion separation fields.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qian Xiang,Yan Liu,Bo Wang,Chengyi Huang,Lilin Wang,Jinsong He,Dong Tian,Fei Shen,Yanzong Zhang
To realize efficient treatment of oily wastewater, various super-wetting materials have been developed. Oily wastewater is often complex and may contain both oil-in-water and water-in-oil emulsions. However, most of the current studies focus on the treatment of single emulsions, and there are fewer studies on the simultaneous separation of oil-in-water and water-in-oil emulsions. In this paper, by removing hemicellulose and lignin from bamboo processing waste powder (BPWP), the treated bamboo powder (TBP) containing mainly cellulose was obtained. TBP has superoleophobicity underwater and superhydrophilicity underoil, which can separate not only various oil-in-water emulsions stabilized by surfactants, but also water-in-oil emulsions stabilized by different surfactants, and the separation efficiency is higher than 99 %. The separation efficiencies of TBP for different water-in-oil emulsions were all higher than 99 %. On this basis, we have established an intelligent device that makes full use of underwater super-hydrophobic and under-oil super-hydrophilic properties to realize the purification of water and de-watering and recycling of floating oil in complex oil-water systems. This work provides a very promising direction for industrial application in practical oily wastewater treatment and fuel recovery.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Guoxin Zhu,Xiong Zhang,Yan He
Oily wastewater produced from various industries and oil spills has posed serious threats to the environment and human health. Promisingly, superwetting materials emerge as great candidates for efficient oil/water separation. In this work, a superhydrophilic-superoleophobic melamine sponge was prepared using a facile immersion method. Methyltrimethoxysilane (MTMS) was used as a binder, which combined fluorosurfactant (FS-50) and TiO 2 onto the sponge surface. The coated sponge displayed a water contact angle of 0° and an oil contact angle of 154.5°. Accordingly, it exhibited absorption capacities of above 86 g/g for water and under 1 g/g for oils. Based on its selective permeability and 3D porous structures, the coated sponge could continuously separate various immiscible oil/water mixtures and oil-in-water emulsions with separation efficiencies larger than 99.4 % and 98.7 %, respectively. Notably, the superhydrophilic-superoleophobic sponge was extended to present opposite wettability towards polar and nonpolar liquids. Consequently, it achieved continuous separation of immiscible oil/oil mixtures, with separation efficiency over 99.1 %. Additionally, the coated sponge displayed excellent reusability, great mechanical stability against compression and abrasion, and stable separation performance for various harsh oil/water mixtures. The study presented a promising separation candidate for future applications in oily wastewater treatment and other liquid/liquid separation fields.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Shusu Shen,Qifeng Fan,Honglin Li,Lunbo Xu,Ganwei Zhang,Renbi Bai
Developing a stable MOF-modified membrane for efficient treatment of oily wastewater remains a challenge. In this study, NH 2 -MIL-88B(Fe) (NM88B) was deposited on the commercial polyvinylidene fluoride (PVDF) membranes, and grafted with perfluorohexane-1-sulfonic acid potassium salt (PFHx) to achieve quaternization modification. This reaction proceeds in an environmentally friendly manner due to the absence of any catalyst. The introduction of fluorine atoms through grafting PFHx resulted in the modified PVDF membrane (NPF) demonstrating remarkable underwater superoleophobic property with an underwater oil contact angle at ∼180°. In separation of various oil-water emulsions, the NPF membrane afforded a high permeation flux (up to 2043 L·m −2 ·h −1 ) and rejection rate (∼99 %). The oil rejection of NPF membrane was >99 % after 10 filtration cycles of n -hexadecane-water emulsion, and the pure water flux of the recovered membrane was kept at 82.65 % of the original flux, indicating a very good reusability and stability. Filtration of mixed dye/oil-water emulsions showed that the NPF membrane remove 99 % of both oil and dye from the mixture. This work provides a simple and stable modification of PVDF membrane, exhibiting remarkable underwater superoleophobicity and hydrophilicity , thereby harboring substantial prospects in the treatment of oily wastewater.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2024
·
IF 5.9
Yan Liu,Yanhong Wu,Hongchun Chen,Rujing He,Hong Xiao,Chengyi Huang,Xiaojing Wang,Zhenxing Zeng,Jinsong He,Yanzong Zhang
At present, there are few studies on the removal of water from oil, but water in fuel can cause machine malfunctions and even safety accidents, which cannot be ignored. In this study, an oil-resistant superhydrophilic/air superoleophobic sponge (SS-MS) was designed to selectively absorb water from oil. Through layer by layer deposition, polyphenols, particles, and fluorinated surfactants were assembled on the sponge, finally achieving the effect of super hydrophilic and super oil phobic in the air. The contact angle of the modified sponge SS-MS on diesel oil can reach 153°, and the absorption efficiency of water in diesel oil can reach more than 99 %. Moreover, a continuous selective absorption device for water in oil was constructed, the SS-MS sponge can still achieve a water absorption efficiency of 98 % after ten cycles. Importantly, the SS-MS has excellent mechanical and chemical stability under 80 % strain, different pH, UV irradiation times and temperatures. In addition, the materials used in this study are all green and low-pollution substances, and melamine sponge has the advantages of low price, light weight, good elasticity and high porosity. In summary, SS-MS offers a new approach to remove water from fuel and has the potential for large-scale applications.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 36
·25394-25400
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IF 4.449
Yuqi Li,Hui Zhang,Mizi Fan,Jiandong Zhuang,Lihui Chen
Oil–water separation has recently become an important subject due to the increasing incidence of oil spills. Materials with underwater superoleophobic properties have aroused considerable interest due to their cost-effectiveness, environmental friendliness and anti-fouling properties. This paper presents a robust salt-tolerant superoleophobic aerogel inspired by seaweed used without any further chemical modification for oil–seawater separation. The green aerogel is prepared by freeze-drying of sodium alginate (SA)–nanofibrillated cellulose (NFC) using Ca2+ ions as the crosslinking agent. The three-dimensional (3D) interconnected network structure of the developed aerogel ensures its high mechanical strength and good flexibility. The natural hydrophilicity of the polysaccharides contained in the aerogel ensures its excellent underwater superoleophobicity, antifouling and salt-tolerance properties. More impressively, the as-prepared aerogel can even keep its underwater superoleophobicity and high hydrophilicity after being immersed in seawater for 30 days, indicating its good stability in marine environments. Furthermore, the aerogel could separate oil–seawater mixtures with a high separation efficiency (of up to 99.65%) and good reusability (at least 40 cycles). The facile and green fabrication process combined with the excellent separation performance and good reusability makes it possible to develop engineering materials for oil–water separation in marine environments.
研究领域:
材料科学
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环境科学
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海洋科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Mingji Su,Yong Liu,Shihong Li,Zhengping Fang,Benqiao He,Yuhong Zhang,Yulin Li,Peixin He
Hydrogel has been widely applied in agriculture, oil/water separation, and tissue engineering due to its hydrophily and three-dimensional network structure. But its practical applications are restricted by their non-reversible deformation or poor mechanical property to a great extent. In this study, we prepared a rubber-like, interpenetrating-network poly(acrylamide-co-acrylic acid)/chitosan/methacryloxy propyl trimethoxyl silane modified SiO 2 nanocomposite hydrogel (P(AM-co-AA)/CS/MPS-SiO 2 nanocomposite hydrogel, SIPN-Gels) that exhibit feature underwater superoleophobicity, self-healing and low swelling ratio properties. The nanocomposite hydrogel has hierarchically porous structure and dense spherical papillae structures on its surface, which can improve oil-repellent capability and result in superoleophobicity and self-cleaning property. Besides, synergetic interactions of CS physical networks and MPS-SiO 2 crosslinked P(AM-co-AA) covalent network endows the hydrogel with rubber-like mechanical property (high elasticity, fast self-recovery after large tensile or compression deformation), superior to most of reported underwater superoleophobic hydrogels. To apply this hydrogel for efficient oil/water separation, the obtained underwater superoleophobic hydrogel is further coated on a stainless-steel mesh as separator, we believe that the rubber-like nanocomposite hydrogel will inspire researchers to design flexible and wearable oil-repellent or oil/water separation materials.
研究领域:
材料科学
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环境工程
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 27
·11044-11061
·
IF 4.5
Li Ruhui,Yu Ruobing,Fan Junhan,Chang Bu
With the fast growing of oily contaminants, continuous oil/water separation with high flux is in demand. Superhydrophilic/superoleophobic composites are considered as ideal candidates. In this work, the oil–water separation composite is from superhydrophilic copper mesh coated by robust superhydrophilic/superoleophobic paint based on fluorine-containing epoxy resin. Firstly, a superhydrophilic/superoleophobic coating with excellent comprehensive properties was prepared through hydrophilic epoxy and superhydrophilic/superoleophobic TiO 2 . Then copper mesh was treated into being superhydrophilic, and the superhydrophilic/superoleophobic coating was sprayed on the superhydrophilic copper mesh to obtain oil–water separation material. As a result, the oil–water separation efficiency of the separation material is higher than 99.7%, the water flux is higher than 80,000 L m −2 h −1 , and it has excellent mechanical properties. The oil–water separation material is promising for the applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Chemical Reactor Engineering
·
2023
·
IF 1.6
Junxiang Guo,Jianlong Wu,Jirigele Qinggele,Zhixing Zhao,Tongbin Wang,Hongjun Yang,Daqiang Cang
The superoleophobic, superhydrophilic, and flame-retardant coatings were obtained through layer-by-layer (LBL) technology using fly ash (FA) as the core. Chitosan (CS), phytic acid (PA), and fluorosurfactant (FS50) were assembled onto FA by LBL assembly using the principle of electrostatic adsorption. The CS and PA were recycled assembled on FA core for 10 layers, which was further deposited with FS50 molecules as the final layer (marked as FA@CS-PA 10 @FS50). Multifunctional coatings consisted of the FA@CS-PA 10 @FS50 powders and polymer binders were formed and could be used on a variety of substrates of various shape and size. The obtained coatings presented superoleophobicity, superhydrophilicity, and flame retardance. The contact angles (CAs) of coated substrates were all greater than 150° towards various oils (rapeseed oil, diesel, hexadecane, and dodecane), while achieved water CAs as low as 0°. The as-fabricated coatings could efficiently separate different oil/water mixtures and lotions while avoiding pollution of the separated materials. The coatings also achieved superior flame retardance, and the fire was self-extinguished within 13 s. Moreover, it also obtained excellent mechanical durability.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Meng Zhang,Daliang Xu,Yanrui Wang,Jiaxuan Yang,Xiaobin Ma,Junwen Ding,Peijie Li,Langming Bai,Heng Liang
Ceramic membrane technology is effective for oil emulsion separation, while its low permeance and fouling issue yield high energy consumption in practical applications. Herein, a series of ceramic membranes were fabricated by incorporating the SiO 2 sintering aid into Al 2 O 3 ceramic powder using a compression molding method. Due to the melting and recrystallizing of SiO 2 on the surface of coarse grains, the modified ceramic membrane exhibited the underwater superoleophobicity property. After optimizing the fabrication conditions, including sintering temperature, molar ratio of Al 2 O 3 /SiO 2 and molding pressure, the modified ceramic membrane had a pure water permeance of 1319 L·m −2 ·h −1 ·bar −1 and a petroleum ether rejection rate of 97.1 %. In addition, the increase in the square quartz phase narrowed the pore size and improved the hydrophilicity of the ceramic membrane, thereby alleviating the pore blocking and enhancing the flux recovery. The flux recovery rate was about 86.1 % after the sodium hydroxide backwashing. This study presents a rational strategy for developing ceramic membranes with scalable potential for efficient oil emulsion separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Jingwei Lu,Fangchao Li,Gan Miao,Xiao Miao,Guina Ren,Bo Wang,Yuanming Song,Xiangming Li,Xiaotao Zhu
Traditional membrane-based separation methods are limited by the inability of a single membrane to separate both oil/water and oil/oil mixtures. Herein, to address this challenge, we have produced a superhydrophilic/superoleophobic shell powder coating that can be used as an advanced separation membrane for separating oil/water mixtures, emulsions, and oil/oil mixtures, when coated on a copper mesh and fabric. Utilizing its water-affinity and oil-repellency, the separation membrane can separate oil/water mixtures and emulsions with high separation efficiency. Interestingly, our separation membrane displays opposite wetting behavior between high-polar oils and low-polar oils, and utilizing this selective wetting to oils with different polarity, oil/oil mixtures separation is achieved effectively, even if the surface tension difference between two oils is as small as 2.4 mN/m. Using an ethanol-prewetting strategy, on-demand oil/water and oil/oil separation are also achieved on this separation membrane. This study is expected to present a promising approach to membrane-based separation technologies.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）