Journal of Petroleum Exploration and Production Technology
·
2025
·Vol. 15
·期 3
·1-17
·
IF 3.2
Peng Mingguo,Wen Qing,Wang Luhan,Liang Qifan,Yang Jun,Zhang Qi,Zhao Jing
Due to their high viscoelasticity and excellent plugging ability, surfactant foam systems can mitigate the effects of heterogeneity and have emerged as a key technology in tertiary oil recovery in recent years. Moreover, achieving ultra-low oil/water interfacial tension (IFT) is critical for enhanced oil recovery (EOR), as it facilitates the deformation and mobilization of oil droplets from pores. However, conventional surfactant systems often struggle to simultaneously achieve ultra-low oil/water IFT and high foam performance. To overcome this limitation, this study developed a composite surfactant system by combining small-molecule anionic and cationic surfactants with a nonionic surfactant, enabling both ultra-low oil/water IFT and high foam performance. The compound surfactants were evaluated for IFT, emulsification performance, and foam performance within a concentration range of 1–10 mM. Based on the comprehensive evaluation results, a concentration of 4 mM was selected for further investigation in a heterogeneous micro-model oil displacement experiment to analyze its displacement behavior. The results demonstrated that at a concentration of 2 mM, the foaming agent achieved the lowest oil/water IFT of 9.834 × 10 − 4 mN/m, while at 4 mM, the foam composite index reached its peak value of 12,960 mL·min. The ability to reduce IFT was found to be approximately proportional to foam performance and inversely proportional to emulsification performance. The heterogeneous micro-model oil displacement experiment demonstrated that chemical flooding increased the recovery ratio by 24% compared to water flooding, with the foam action zone exhibiting significantly enhanced displacement efficiency. The novelty of this study lies in the use of surfactants with different properties to construct a foam system with ultra-low oil/water IFT and excellent foam performance, as well as the execution of heterogeneous micro-model displacement experiments. This work provides valuable insights for the design of fracture carbonate foaming agents and future studies on EOR.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Lei Cao,Hongpeng Liu,Haoyu Li,Huiming Lin,Lingfei Li
Microfiltration membrane separation technology has been widely employed in the field of oil-water separation because of its low energy consumption. However, the practical applications of polyvinylidene fluoride (PVDF) microfiltration membrane are limited due to its strong hydrophobicity and poor anti-fouling. A superhydrophilic/underwater superoleophobic PVDF microfiltration membrane is prepared through surface co-coating inspired by mussel chemistry. The dopamine (DA) and fulvic acid (FA) generate a hydrophilic coating with hydrophilic functional groups through a mild Michael addition/Schiff base reaction. When the DA/FA ratio is 2/8 and a modification time is 6 h, the pure water flux reaches 8011 L m −2 h −1 bar −1 , the flux of oil-in-water emulsion is 1915 L m −2 h −1 bar −1 , and the rejection is 99.1 %. The retention rate of the membrane for oil-water emulsions containing different oil phases (heavy and light oils) is consistently above 98.5 % and shows high recoveries ( FRR > 86.6 %) after twenty separations. Modified membranes have high anti-pollution ability for characteristic pollutants in water bodies (for example: BSA, SDS). This work demonstrates a simple surface coating preparation method that has excellent separation performance, and environmental friendliness, offering a promising strategy for large-scale modified membranes to treat oily wastewater.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Shengye Chen,Kunquan Li,Xuanjun Li,Zhuohan Chen,Xiaojing Su,Xiaofan Zhang,Huali Xie,Yongxian Zhou,Wenjian Wu
At present, many oil-water separation membranes are being developed to purify oily wastewater. However, oily wastewater often contains heavy metal, which are often difficult to dispose during separation. Furthermore, most of the oil-water separation membranes cannot be degraded after scrap, producing pollution to environment. Herein, the polyvinyl alcohol/chitosan@carnauba wax (PCGCW) membrane with heavy metal adsorption and biodegradation performance was acquired by electrospinning and spraying process. The acquired PCGCW membrane had excellent mechanical properties after crosslinking glutaraldehyde (GA). Furthermore, the composite membrane had excellent superhydrophobic property (WCA = 154°) with a rolling angle of 2°, due to the introduction of carnauba wax. Exhilaratingly, for emulsions with surfactant, it had a high separation flux with 19,217 L·m −2 ·h −1 ·bar −1 and splendid an oil purity over 99.9 %. Besides, the efficiency of oil purity and separation flux remained stable even after 10 separations. In addition, the PCGCW membrane had the ability to adsorb heavy metals with adsorption capacity of 51–106 mg/g for Cu 2+ , Fe 3+ , Co 2+ ions. Foremost, the superhydrophobic PCGCW membrane was biodegradable, with degrading 29.76 % within 40 days. The prepared composite membrane had the advantages of low cost, high separation flux, great repeatability, adsorbable heavy metals and degradability, which had a vast application prospect.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Zehao Chen,Yunjia Wang,Xuekai Jin,Zhuoyue Tian,Yunpeng Zhang,Xiufang Wen,Jihao Zuo,Pihui Pi
Three-dimensional superhydrophilic materials, with large pores and extensive permeation channels, can achieve high-flux separation of oil-in-water emulsions. However, complex internal structure and high specific surface area also lead to severe oil contamination during the separation process, resulting in rapid declines in separation efficiency and permeation flux, necessitating frequent cleaning and significantly limiting their practical applications. The oleophobicity of superhydrophilic materials mainly relies on the hydration layer on the surface. Enhancing the combination strength of superhydrophilic surfaces to water can effectively reduce the hydration layer damage caused by oil, thereby extending the demulsification lifespan of the material. In this study, we enhance the hydration strength of the copper foam surface by constructing a special pocket-like nano structure and endowing it with a substantial number of hydrated groups. During continuous separation of oil-in-water emulsions, the copper foam filter can achieve a separation efficiency exceeding 99.1 % and a permeation flux greater than 20,000 L·m −2 ·h −1 . In cyclic separation tests, under conditions where the cleaning interval up to 150 mL of emulsion, the declined efficiency remains at 98.4 %, while the declined flux exceeds 18,000 L·m −2 ·h −1 . The cleaning interval is as high as 85 mL·cm −2 . Furthermore, after cleaning, both the separation efficiency and permeation flux of the copper foam can be completely restored, significantly outperforming the copper foam without hydration strengthen modification and various other three-dimensional materials.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zehao Chen,Qing Tan,Xuekai Jin,Xiufang Wen,Jihao Zuo,Pihui Pi
Three-dimensional superhydrophilic materials hardly achieve continuous high-flux demulsification and separation for oil-in-water emulsions due to intrinsic oleophilicity leading to potential penetration of oil droplets through hydration layer and contamination on the surface over long-term separation processes. Constructing intrinsic oleophobic micro-regions on superhydrophilic surface can intensify anti-oil-fouling capacity for three-dimensional superhydrophilic materials. Herein, a composite superhydrophilic-oleophobic copper foam was prepared through co-deposition of aminated and fluorinated carbon nanotubes, skillfully introducing inherent oleophobic micro-regions on superhydrophilic interface to intensify anti-oil-adhesion capacity. Through a column technique, the modified copper foams achieved continuous demulsification of surfactant-stabilized and free oil-in-water emulsions without interruption for cleaning with high fluxes over 6000 and 10,000 L·m −2 ·h −1 , and separation efficiencies over 95.1 % and 97.4 %, respectively. Various emulsions after demulsification transformed into immiscible oil–water mixtures, which can be quickly separated into pure oil and water at the aid of a second-step separation procedure by a superhydrophilic copper mesh. Importantly, the amount of recycled oil was consistent with that in feed emulsion during separation, indicating the accumulated oil in the copper foam could maintain dynamic equilibrium and a continuous and steady-state demulsification was achieved. The high-flux and continuous demulsification represents a significant breakthrough for superhydrophilic materials in the industrial application of oil–water separation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xuekai Jin,Yunjia Wang,Yunpeng Zhang,Zehao Chen,Shouping Xu,Jiang Cheng,Lanfang Wen,Pihui Pi
The separation of water-in-oil (W/O) emulsions is crucial for addressing resource shortages and environmental protection. Superoleophilic/superhydrophobic materials, owing to their selective wettability, can effectively separate W/O emulsions by low-viscosity oils. However, when dealing with viscous water-in-oil emulsions from oils with high viscosity, challenges such as severe oil adhesion and pore blockage significantly hinder separation performance. In this study, a superhydrophobic/oleophobic sponge was fabricated by introducing “ rod-dot ” Co 3 O 4 nanoparticles onto the sponge’s inner surfaces, followed by fluorination modification. For emulsions prepared with low-viscosity oils (η O < 1 mPa·s), the sponge achieved a separation efficiency of over 98 % with a permeation flux exceeding 10,000 L·m –2 ·h –1 . Under an applied pressure of 5000 Pa, after continuously treating 400 mL of emulsion, the fluxes for water-in-vegetable oil emulsions (η V = 59 mPa·s) and water-in-lubricating oil emulsions (η L = 65 mPa·s) remained above 1207 L·m –2 ·h –1 , with separation efficiencies of 99.49 % and 99.82 %, respectively. These results demonstrate the sponge’s high-efficiency and durable separation performance for water-in-oil emulsions by high-viscosity oils. The superior performance is attributed to the inherent oleophobicity of the material, which suppresses the formation of boundary layers and maintains unobstructed pore channels. This study offers a novel approach for the efficient and durable separation of viscous W/O emulsions, with significant potential in waste oil recovery and fuel purification.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 36
·19079-19090
·
IF 8.867
Weiyang Lv,Qingqing Mei,Huakang Fu,Jianliang Xiao,Miao Du,Qiang Zheng
Synthesis of structure-controlled nanocrystals on target substrates presents an enticing prospect for fabricating multifunctional devices. Herein, layered double hydroxides (LDHs) with different morphologies were fabricated via hydrothermal treatment on various substrate surfaces. The morphology of the LDH nanostructures from ultrathin nanosheets, parallel aligned nanoscrolls and vertically aligned nanoscrolls could be finely tuned by adjusting the reaction time, temperature and metal–salt concentration. A speculative model was proposed to illustrate the reaction process where the LDH growth units interacted with the modified surface at first, then gradually formed the nanosheets and finally developed into nanoscrolls upon termination of the reaction. The investigation confirmed that amino groups and a positively charged surface play key roles in the formation of well-defined LDH nanoscrolls. Benefiting from the unique hierarchical structure and high LDH loading, the hybrid nanofiber membranes with vertically aligned LDH nanoscrolls exhibited excellent adsorption capability toward methyl orange and Cu2+ and could effectively separate a surfactant stabilized oil-in-water emulsion solely by gravity, with high flux and oil rejection. Meanwhile, these hybrid membranes have shown great potential as highly efficient catalysts for degradation of organic pollutants, making them versatile and comprehensive materials for water remediation.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiaojing Su,Hongqiang Li,Xuejun Lai,Lin Zhang,Jing Wang,Xiaofeng Liao,Xingrong Zeng
Large-scale fabrication of superhydrophobic surfaces with excellent durability by simple techniques has been of considerable interest for its urgent practical application in oil–water separation in recent years. Herein, we proposed a facile vapor–liquid sol–gel approach to fabricating highly durable and robust superhydrophobic polydimethylsiloxane@silica surfaces on the cross-structure polyester textiles. Scanning electron microscopy and Fourier transform infrared spectroscopy demonstrated that the silica generated from the hydrolysis–condensation of tetraethyl orthosilicate (TEOS) gradually aggregated at microscale driven by the extreme nonpolar dihydroxyl-terminated polydimethylsiloxane (PDMS(OH)). This led to construction of hierarchical roughness and micronano structures of the superhydrophobic textile surface. The as-fabricated superhydrophobic textile possessed outstanding durability in deionized water, various solvents, strong acid/base solutions, and boiling/ice water. Remarkably, the polyester textile still retained great water repellency and even after ultrasonic treatment for 18 h, 96 laundering cycles, and 600 abrasion cycles, exhibiting excellent mechanical robustness. Importantly, the superhydrophobic polyester textile was further applied for oil–water separation as absorption materials and/or filter pipes, presenting high separation efficiency and great reusability. Our method to construct superhydrophobic textiles is simple but highly efficient; no special equipment, chemicals, or atmosphere is required. Additionally, no fluorinated slianes and organic solvents are involved, which is very beneficial for environment safety and protection. Our findings conceivably stand out as a new tool to fabricate organic–inorganic superhydrophobic surfaces with strong durability and robustness for practical applications in oil spill accidents and industrial sewage emission.
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CELLULOSE
·
2024
·Vol. 31
·期 7
·4627-4644
·
IF 4.9
Yuan Hua-Bin,Zhao Manman,Zhu Xiaowei,Sha Desheng,Chen Guoqiang,Xing Tieling
Numerous techniques for achieving superhydrophobic modification of cotton fabrics are documented in existing literature. However, pursuing multifunctionality, especially concerning textile performance, remains a topic of significant research interest. This study introduced a straightforward yet highly effective method for producing modified cotton fabric (SFC) exhibiting a vibrant orange-yellow coloration, along with exceptional self-cleaning, stain-resistant, UV-blocking, anti-icing, and photothermal de-icing properties, through the utilization of ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and polydimethylsiloxane (PDMS). The surface of the SFC was evenly coated with small nanoparticles, identified by X-ray diffractometer (XRD) as β-FeOOH. The SFC displayed a water contact angle of 165.9° and a sliding angle of 2°, demonstrating outstanding superhydrophobicity. In addition, the SFC achieved a UPF value of 80, indicating exceptional UV-blocking capabilities. Additionally, the SFC exhibited remarkable stability when subjected to harsh conditions, including exposure to strong acid (pH = 1) and alkali (pH = 13), various chemical reagents, 600 min of water washing, and 30 cycles of abrasion testing. The approach proposed in this study offers the advantages of cost-effectiveness, environmental friendliness, and fluorine-free characteristics, and is applicable across a range of fabrics, and has certain practical utility. Graphical abstract
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jiqun Li,Yan Zhang,Tianlu Yu,Shiyu Song,Xinyu Wei,Xiuling Qi,Jianlin Yang
Inorganic coatings with high transparency and superhydrophilicity have attracted tremendous attention because of their potential applications in marine environment monitoring, and oily wastewater treatment. However, the transparency and superhydrophilicity are usually mutually exclusive. Herein, we present a new facile strategy for fabricating highly transparent and mechanically robust superhydrophilic inorganic coatings with outstanding anti-fogging ability and anti-oil-fouling performance for high-viscosity oils. In this strategy, amorphous calcium phosphate (ACP) coatings are mineralized on the surface of polydopamine and polyethylenimine (PDA/PEI) membranes under the synergistic effect of magnesium ions, citric acid, and poly(acrylic acid) at room temperature, forming an organic-inorganic composite structure with a uniform texture on various substrates. Owing to the strong hydration capacity of ACP, these coatings are highly efficient at preventing surface fogging and avoiding underwater crude oil fouling. Meanwhile, the ACP coating without grain boundaries or pores can reduce light scattering, thus maintaining the high transparency of the substrate. Moreover, the organic-inorganic composite structure endows the coatings with robust mechanical properties. This PDA/PEI-ACP mineralized coating can be deposited on various substrates, showing potential applications in underwater optical lenses, oily wastewater treatment, microfluidic devices, and other areas.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yong Yang,Zhe Yang,Guoxin Zhuang,Ya-Nan Feng,Fei-Fei Chen,Yan Yu
Beyond traditional paper, multifunctional nanopaper has received much attention in recent years. Currently, many nanomaterials have been successfully used as building units of nanopaper. However, it remains a great challenge to prepare flexible and freestanding metal–organic framework (MOF) nanopaper owing to the low aspect ratio and brittleness of MOF nanocrystals. Herein, this work develops a flexible and free-standing MOF nanopaper with MOF nanowires as building units. The manganese-based MOF (Mn-MOF) nanowires with lengths up to 100 μm are synthesized by a facile solvothermal method. Through a paper-making technique, the Mn-MOF nanowires interweave with each other to form a three-dimensional architecture, thus creating a flexible and free-standing Mn-MOF nanowire paper. Furthermore, the surface properties can be engineered to obtain high hydrophobicity by modifying polydimethylsiloxane (PDMS) on the surfaces of the Mn-MOF nanowire paper. The water contact angle reaches 130°. As a proof of concept, this work presents two potential applications of the Mn-MOF/PDMS nanowire paper: (i) The as-prepared Mn-MOF/PDMS nanowire paper is compatible with a commercial printer. The as-printed colorful patterns are of high quality, and (ii) benefiting from the highly hydrophobic surfaces, the Mn-MOF/PDMS nanowire paper is able to efficiently separate oil from water.
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MOLECULES
·
2024
·Vol. 29
·期 10
·2302
·
IF 4.2
Linli Tan,Yuqi Wang,Mingpu Li
An interconnected sponge structure and porous surface poly (acrylonitrile-co-methyl acrylate) (P(AN-MA)) microfiltration membranes (MF) were fabricated via thermally induced phase separation (TIPS) by using caprolactam (CPL), and acetamide (AC) as the mixed diluent. When the ternary system was composed of 15 wt.% P(AN-MA), 90 wt.% CPL, and 10 wt.% AC and formed in a 25 °C air bath, the membrane exhibited the highest water flux of 8107 L/m2·h. The P(AN-MA) membrane contained hydrophobic groups (-COOCH3) and hydrophilic groups (-CN), leading it to exhibit oleophobic properties underwater and hydrophobic properties in oil. The membrane demonstrates efficient separation of immiscible oil/water mixtures. The pure water flux of the petroleum ether/water mixture measured 870 L/m2·h, and the pure oil flux of the petroleum tetrachloride/water mixture measured 1230 L/m2·h under the influence of gravity. Additionally, the recovery efficiency of diluents through recrystallization was 85.3%, significantly reducing potential pollution and production costs.
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