Petroleum Research
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2025
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IF 4
Chengxi Deng,Min Chen,Changsong Liu,Yinfeng Xu,Yonghui Du,Hua Dong
Rock surface wettability plays a crucial role in gas flooding for oil recovery. Natural rock surfaces are usually oleophilic, resulting in high flooding resistance and low recovery in gas flooding. This study explores the regulation of the wettability of sandstone rock surfaces by modifying them with 1H,1H,2H,2H-perfluorodecyltrimethoxysilane or its mixtures with hexyltrimethoxysilane to achieve oil contact angles ranging from 0° to 93.2°. Simulated gas flooding experiments, with N 2 as model gas, reveal that reducing the oleophilicity of rock surfaces improves gas flooding efficiency. Compared to the unmodified superoleophilic rocks, the final oil recoveries in the cores with neutral oil wettability significantly increases and the pressure differential for gas flooding significantly decreases. In cases of cores with permeability of 22 mD, 0.88 mD and 0.09 mD, the increases in oil recovery are from 28.5% to 37.5%, from 20.2 to 27.3% and from 9.1% to 15.4%, respectively; and the reductions of pressure differential for gas flooding are from 53 kPa to 41 kPa, from 323 kPa to 272 kPa, from 1054 kPa to 935 kPa, respectively. These results highlight the critical influence of wettability regulation on gas flooding efficiency, offering valuable insights for optimizing oil recovery strategies.
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高影响因子
LANGMUIR
·
2025
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IF 3.9
Jinglin Tan
Considerable effort has been made to design low-cost and eco-friendly materials for effective oil–water separation. In this work, an efficient strategy for fabricating superhydrophobic filter paper (PDMS-Paper-x) via dip coating in a methoxy-terminated polydimethylsiloxane (PDMS macromolecule coupling agent) solution was reported. The chemical constitution and surface morphology of PDMS-Paper-x were characterized by using scanning electron microscopy, X-ray photoelectron spectroscopy, and attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. PDMS-Paper-0.5 shows a water contact angle of 151.1°, exhibiting superhydrophobicity. Owing to its interfibrous pore structure and superhydrophobicity, PDMS-Paper-0.5 demonstrated high-efficiency separation properties for immiscible oil–water mixtures. Under the gravity-driven condition, the separation flux value of hexane–water mixtures was 603.9 L·m–2·h–1, and the separation flux value of continuous octane–water mixture separation was higher, reaching up to 14187.6 L·m–2·h–1. Additionally, PDMS-Paper-0.5 has anti-icing properties with an ice adhesion strength of 10.0 kPa. This work demonstrates a simple coating strategy to fabricate superhydrophobic filter paper with potential applications in oil purification and anti-icing.
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高影响因子
LANGMUIR
·
2025
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IF 3.9
Cailing Chu,Fei Tan,Jingyu Wang,Tiejun Liu,Zhenghe Xu,Dejun Sun
The dispersion of magnesium hydroxide (Mg(OH)2) particles in kerosene is crucial for the pyrolytic treatment of radioactive organic liquid wastes yet is severely hindered by water preadsorbed on particle surfaces from ambient air. This work investigated the effect of preadsorbed water on the dispersion stability and rheological properties of Mg(OH)2 particles in kerosene. We correlated preadsorbed water content with the suspension’s microstructure and rheology and revealed that powerful capillary attractions between particles induced by preadsorbed water can negate the stabilizing action of surfactants. Mg(OH)2 particles with 8.1% preadsorbed water (mostly in the state of capillary water) formed large, robust aggregates in kerosene, resulting in a higher storage modulus (92 kPa) of the concentrated suspension. Even with the addition of a surfactant polyoxyethylene alkyl ether carboxylic acid (CE10Ac), the storage modulus remained high at 1.8 kPa due to the dominant capillary forces. To overcome this challenge, we proposed a synergistic approach combining particle predrying with surfactant modification. Predrying particles can eliminate the capillary forces by removing the capillary water and enable the effective adsorption of CE10Ac molecules onto individual particle surfaces. This strategy promotes strong steric and solvation stabilization, yielding stable, low-viscosity (<40 mPa·s) suspensions. These findings offer a practical route for preparing advanced materials for radioactive waste treatment.
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高影响因子
LANGMUIR
·
2025
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IF 3.9
Xin-Wei Jiang,Cheng Ma,Gui-Yang Ma,Qi-Rui Zhang,Hao-Ran Li,Lei Zhang,Lu Zhang,Jian-Bin Huang,Qi Sun
Research on reducing the minimum miscible pressure (MMP) of CO2 and oil is imperative for the advancement of CO2 flooding, which can effectively enhance the recovery of low-permeability reservoirs and enable CO2 geological storage. However, the conventional methods of determining the MMP (e.g., slim-tube experiments, supercritical extractor) are costly and time-consuming. In this paper, an experimental method for measuring the MMP, the visible vanish of interface measurement (VVIM) method, was proposed, and the effects of stirring rate, mass ratio, temperature, and oil phase properties on the scCO2–oil miscible pressure were explored. At the same time, the assist-miscible effect of polyether surfactants, such as polyoxyethylene sorbate (Tween 80), C8PO15EO10 (containing a polyether block), and phPO15EO10, were investigated. The experimental results show that the miscible pressure of scCO2–oil is directly proportional to the stirring rate and inversely proportional to the temperature, and the mass ratio is the most difficult to achieve miscibility when the mass ratio is close to 1:1. Compared with conventional nonionic surfactants, short carbon chain-extended polyether has stronger amphiphilicity and a more suitable spatial matching effect, resulting in a better assist-miscible effect. The proposed materials and methods provide a reliable reference for the study of the structure–activity relationship of surfactants for supercritical carbon dioxide flooding.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Yawei Shi,Yumei Xing,Keyan Liu,Yan Wang,Ya Sun,Zonglin Pan,Guanghui Ding
Dyes and oil substances are two common pollutants in wastewater, and it is highly expected to remove them simultaneously. In this study, MgFe 2 O 4 was synthesized by co-precipitation and then loaded onto polyvinylidene fluoride (PVDF) membrane to fabricate a MgFe 2 O 4 -PVDF composite membrane, which was successfully employed for concurrent dye degradation through peroxymonosulfate activation and separation of oil-in-water emulsions through one-step single-pass filtration. Under optimum conditions, both Rhodamine B (RhB) and hexane could be efficiently removed by 99.21 % and 99.89 % respectively. The effects of pH, inorganic ions and humic acid were studied, and the system showed wide applicability and good reusability. The reaction mechanism for RhB degradation was proposed based on quenching tests, open circuit potential test, galvanic oxidation process and X-ray photoelectron spectroscopy. The degradation pathway of RhB was proposed according to density function theory calculations for both RhB and its deprotonated counterpart deH-RhB as well as LC-MS analysis, and toxicity evaluation was also performed. The MgFe 2 O 4 -PVDF/PMS system may offer a possible solution for the efficient remediation of complex wastewaters.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2025
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IF 1.6
Ren Peng,Yang Yang,Liu Dai,Guan Cheng-peng,Huang Pin-wen,Qi Ming
A novel extraction process utilizing THEE-BisDGA ligand has been developed for the rapid and efficient recovery of trivalent lanthanide elements (La, Nd, Eu, and Dy) from uranium-containing acidic systems. The process rapidly achieves equilibrium within just 2 min and exhibits high distribution ratios. Notably, its extraction efficiency shows a positive correlation with the atomic number of the lanthanides. Significantly, the ligand demonstrates exceptional selectivity by excluding U(VI) extraction, thus enabling the targeted recovery of lanthanides. Back-extraction experiments confirm that 0.01 M HNO 3 can quantitatively strip lanthanides in three steps, highlighting its potential for industrial-scale separation and purification of valuable lanthanides. Moreover, density functional theory(DFT) calculations have confirmed that THEE-BisDGA exhibits superior selectivity for Ln(III) over U(VI), further reinforcing its effectiveness and applicability in advanced separation technologies.
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JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Xing'er Jijue,Shiyu Wang,Fazli Wahid,Xuezhi Dai,Qiang Tian
The discharge of oily contaminated water is causing severe environmental harm, highlighting the urgent need to develop cost-effective materials for the extensive treatment of marine oil spills and industrial wastewater. Superhydrophilic/underwater superoleophobic membranes have emerged as a promising technology owing to their potential in treating oily wastewater. However, these membranes still face challenges in the efficient removal of organic pollutants from oily wastewater. To address this, a one-step modification method was employed to functionalize cotton fabrics (CF) using iron oxide nanoparticles (Fe 2 O 3 -NPs). The process involved treating CF with an iron precursor solution at 120 °C for 4 h, resulting in a multifunctional membrane with superhydrophilic and underwater superoleophobic properties. The as-prepared composite membrane demonstrated highly efficient degradation of organic dyes (99.5 %) within 8 min by a heterogeneous photo-Fenton catalytic reaction. It also achieved effective oil/water separation, exhibiting a high flux of 28,680 Lm −2 h −1 , and a separation efficiency of 99.7 %. Furthermore, the membrane showed excellent reusability, stability under harsh environments, and notable antifouling properties. By integrating rapid photocatalytic degradation with efficient oil/water separation, this study represents a significant step toward the development of multifunctional membranes for complex wastewater remediation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Huayi Tan,Yinling Liu,Bingqiang Fan,Ke Xu,Shili Zheng,Yang Zhang
The deep separation of molybdenum (Mo), vanadium (V), and nickel (Ni) from acid-leaching solutions has received increasing attention because of the high value of Mo, V and Ni materials. In this study, an efficient strategy is proposed to separate Mo, V, and Ni from an acidic solution that contains iron (Fe). This strategy controls the ion species by adjusting the valence state of the metals to separate them via two stages: selective solvent extraction and oxidation precipitation. In the first stage, more than 99.0 % of the Mo in the form of molybdenum blue species as the anion ion was extracted by the tertiary amine N235, and V, Ni, and Fe (both as the cation ions) remained in the raffinate under the reduced environment. The high-purity product of Mo was then prepared by stripping and precipitation. The mechanism by which Mo selectively extracted was revealed by Fourier transform infrared spectroscopy, and the special anion [Mo (VI) 2 Mo (V) 4 O 18 ] 6- of molybdenum blue species was confirmed to exist in the Mo-loaded extractant. In the second stage, the reduced V(VO 2+ ) and Fe (Fe 2+ ) were transformed into the forms of polyvanadate ions (in the + 5 state) and Fe 3+ to precipitate them in the forms of sodium vanadate and iron vanadate from the solution that contained Ni, by adding oxidating agent and controlling the solution pH. The results shown that 96.88 % of V and 98.98 % of Fe could be precipitated under the pH was 3, and the mechanisms of V and Fe precipitation were determined by characterization of the precipitates subsequently. On the basis of ion species control, the goal of Mo, V, and Ni separation could be achieved by the selective extraction of N235 and oxidation precipitation.
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JOURNAL OF MOLECULAR LIQUIDS
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2025
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IF 5.2
Quanhang Wang,Jincheng Mao,Jinzhou Zhao,Yanshan Guo,Yvxing Zhang,Jinhua Mao,Zhangxing Chen,Dandan Su,Jianfei Cui,Zhimeng Song,Xu Ping,Shuhui Zhang
Traditional hydraulic fracturing techniques have long been criticized for their deficiencies, including low recovery efficiency, rapid production decline and complex processes. In order to overcome these shortcomings, fracturing-oil displacement integration has been proposed and attracted great attention in the past few years. In this study, a novel hydrophobically associating polymer (HETP) was synthesized and used as an additive to develop a low-damage and high-efficiency imbibition fracturing fluid that meets the fracturing fluid requirements in fracturing-oil displacement integration. A series of experiments were conducted to systematically study and evaluate the properties of the HETP fracturing fluid, including rheology, shear recovery, proppant transport capacity, gel-breaking performance, oil imbibition efficiency, and formation damage rate. The rheology test results showed that the viscosity retention rate of the fracturing fluid was 100.44% at 100℃. The performance tests demonstrated that the HETP fracturing fluid exhibited superior shear recovery and proppant transport capabilities. The evaluations of the broken fluids showed that the HETP fracturing fluids can effectively alter formation wettability, and can promote oil-washing efficiency and emulsifying ability. The spontaneous imbibition test results showed that the broken HETP fracturing fluid exhibited excellent general performance, with a low formation permeability loss of 8.12% and a high imbibition enhanced oil recovery (IEOR) rate of 36.4%, surpassing other molecular fracturing fluids. The oil recovery mechanisms of the HETP factoring fluid are also discussed in details, implying that HETP has enormous potential for future tight oil development.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Jiayuan Xu,Jijun Ding,Chengxi Wei,Haixia Chen
The preparation of stable and highly adhesive composite structures on the copper mesh is important to achieve long-term oil-water separation. In this work, ZnO nanorod arrays/polyvinylidene fluoride/octadecylamine (ZnO/PVDF/ODA) composite membranes are fabricated on copper mesh combining magnetron sputtering, hydrothermal and impregnation methods. The results show that ZnO nanorod arrays enables the surface coating to be firmly attached to the membrane surface, thus significantly improving the mechanical stability of the membrane. ZnO/PVDF/ODA composite membranes demonstrate excellent separation efficiency and flux during gravity-driven oil-water separation process. For all oil-water mixtures tested, the membrane separation efficiency is above 97 %. The best performance is obtained in the separation of dichloromethane and water, while the separation efficiency can reach 99.84 %, it also shows high separation flux (1686.022 Lm -2 h -1 ). Simultaneously, the composite membrane exhibits favorable physical and chemical stability for the purpose of long-term oil-water separation. It provides a feasible method of fabricating composite membranes for efficient oil-water separation based on copper mesh.
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INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Taoyang Cai,Shangjie Ge-Zhang,Hongbo Mu
The development of the petrochemical industry necessitates the treatment of oily industrial wastewater. Addressing the separation, recovery, and reuse of oily wastewater with low-cost, high-efficiency, and environmentally friendly methods has become a significant focus in environmental protection. The search for oil-water separation materials with specific functionality and environmental durability is now a priority. In this study, natural wood was delignified, and ZnO nanoparticles were grown within the wood aerogel to create a functionalized nano-composite wood aerogel. The porous ZnO/DW aerogels exhibited an average adsorption capacity of 17.66 g g −1 . Due to the presence of a hydration shell formed by hydrogen bonding, the water-saturated ZnO/DW aerogel exhibits hydrophilic and oleophobic properties. The separation device achieved a water flux of 39,400 L m −2 h −1 and a separation efficiency of over 98.5 %, effectively facilitating oil-water separation. Furthermore, the synergistic effect of ZnO nanoparticles and wood aerogels resulted in the photocatalytic degradation of methylene blue in solution by up to 92.94 %. The cycle tests show the excellent stability of the sample in compression-release cycle, adsorption-extrusion cycle and photocatalytic degradation cycle.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Zhi-Jun Zhu,Guanhua Shen,Akbar Bashir,Danqing Liu,Xiaohong Wu,Yikun Huang,Yangjun Zhang,Junxuan Luo,Chen Liu,Da-Zhu Chen
Extreme temperature conditions often accelerate the degradation of supercapacitor materials and elevate electrolyte resistance, reducing device longevity and reliability. Efficient temperature regulation is necessary to ensure that supercapacitors can work stably under harsh environmental conditions. To overcome these challenges, we introduce a phase-change fiber film with a core-sheath structure and dual phase-change temperature range fabricated using advanced layer-by-layer coaxial electrospinning. The film was used as a substrate for the in situ polymerization of polyaniline nano-arrays after vacuum coating with a gold layer to create flexible supercapacitors with a PVA/H 2 SO 4 gel electrolyte. The unique needle-like polyaniline nano-arrays enhance the surface area and ion transport channels, resulting in a device with an areal capacitance of 521.3 mF cm −2 at a scan rate of 5 mV s −1 . Our phase change fibers have a high latent heat of 62.4 J g −1 in the 0–10 °C and 40–50 °C ranges for efficient temperature regulation. The stabilized capacitance and internal resistance over two phase-change regions highlight the robust thermal regulation of the device. This advancement represents a significant leap forward for flexible supercapacitors, offering enhanced thermal management and vast potential for future energy storage applications.
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高影响因子
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