COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
·
IF 2.714
Xia Yin,Wanli Kang,Yilu Zhao,Jing Liu,Hongbin Yang,Caili Dai,Bauyrzhan Sarsenbekuly,Saule Aidarova,Lihua Yang,Huiying Yuan,Junling Tan
The produced fluid from reservoirs are generally in the form of emulsion with oil and water, in which indigenous components such as asphaltene, resin and wax can act as natural emulsifiers. In this study, water-in-oil emulsions were prepared with five light crude oils from CQ Oilfield respectively, and investigated to identify the indigenous stabilization mechanism based on a novel visualized method by in situ solvent-dissolution (ISV). The emulsion stability was studied by dehydration rate and droplet size via bottle test and microscope. Saturate-Aromatic-Resin-Asphaltene (SARA) separation, wax appearance temperature (WAT) measurement, and gas chromatography were applied to characterize the indigenous components in the crude oil. Colloid instability index was introduced to analyze the solubility of asphaltene. Furthermore, the stabilization mechanism of the oil emulsion was investigated by ISV method in both macroscopic and microscopic scales via dilution by n -heptane and toluene. The viscosity of oil, interfacial viscosity, interfacial storage and loss modulus were measured by rheometer to evaluate the contribution of the stabilizer quantitatively. The results showed that emulsion stability increased with the concentration of asphaltene, especially over a critical concentration. This ISV method provides a convincing approach to understand the indigenous stabilization mechanism of original crude emulsion vividly rather than that in the model emulsion. The interfacial viscosity, viscoelasticity or oil viscosity increased with asphaltene concentration in the crude oil. The strong elastic interface film formed with asphaltene restricted the droplet coalescence and controlled the stability of emulsions, which was found to be the crucial stabilization mechanism. Asphaltene and its concentration are the dominating factors of stability of these light crude oil emulsions. This work not only clearly clarifies the significant role of asphaltene in the stability of light crude oil emulsions, but also proposes a convenient in situ method to study the emulsion stabilization mechanism.
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Nanomaterials
·
2025
·Vol. 15
·期 6
·450
·
IF 4.3
Tianxin Chen,Yue Wang,Jing Li,Liang Zhao,Xingyang Zhang,Jian He
Oil–water separation is an important method for treating oily wastewater and recovering oil resources. Based on the different affinities of superhydrophobic surfaces to water and oil, long-term oil–water separation devices with low-energy and high efficiency can be developed through the optimization of structure and process parameters. Superhydrophobic coatings were prepared on stainless-steel mesh surfaces using a spray method to construct single-channel oil–water separation equipment with superhydrophobic/oleophilic meshes, and the effects of structural and process parameters on separation efficiency were systematically investigated. Additionally, a multi-channel oil–water separation device was designed and fabricated to evaluate the feasibility and stability of long-term continuous operations. The optimized single V-shaped channel should be horizontally placed and made from 150-mesh stainless-steel mesh folded at an angle of 38.9°. For the oil–water mixtures containing 20 wt.% oil, the oil–water separation efficiencies for single and two-stage separation were 92.79% and 98.96%, respectively. After 36 h of continuous operation, the multi-channel separation device achieved single-stage and two-stage separation efficiencies of 94.60% and 98.76%, respectively. The maximum processing capacity of the multi-channel device reached 168 L/h. The modified stainless mesh can remain stable with a contact angle (CA) higher than 150° to water for 34 days. The average residence time and contact area during the oil–water separation process significantly affect separation efficiency. By optimizing oil–water separation structures and process parameters, and using a superhydrophobic spray modification method, separation efficiency can be improved while avoiding the generation of secondary pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Meiying Xie,Fan Yang,Luyao Yang,Rong Liu,Jinming Du,Qinghao Zhao,Xiaojing Li
To date, no extractants have shown good heavy rare earth elements (HREEs) extraction and separation performance within a large acidity window. Herein, a strategy to introduce benzene and tertiary amine functional groups with both an electron donation effect and large steric hindrance effect into the structure of phosphonic acid was proposed, and a new extractant, ((dioctylamino)methyl)phenylphosphonic acid (DOAM-PPA), has been successfully synthesized by a simple one-step process. The pK a value of DOAM-PPA is higher than those of 2-ethylhexylphosphoric acid mono-2-ethylhexyl ester (P507), di-(2,4,4′-trimethylpentyl)phosphinic acid (Cyanex 272), and bis(2-ethylhexyl)phosphate (P204). DOAM-PPA exhibited good separation of HREEs. DOAM-PPA enabled efficient extraction and separation of HREEs at initial pH = 4.00–1.25 and 0.1–2 mol/L HCl. Its operating window in the acidic region was much larger than those of P507, Cyanex 272 and P204. Under 0.5 mol/L HCl and 0.1 mol/L NaCl, the separation factor (β Lu/Y ) of DOAM-PPA for Lu and Y reached 53.55, which was much greater than those of P507, Cyanex 272 and P204. The saturation capacity of DOAM-PPA for Lu is 2.45 times greater than that of P204 at 0.5 mol/L HCl. When DOAM-PPA was used to directly extract LYSO leachate, although the concentrations of Lu and Y reached 15.5 g/L and 0.75 g/L, respectively, the β Lu/Y still reached 20.22, the β Lu/Ce was 59.37–116.25, and the extraction percentages of Lu were all >86%. Considering the synthetic conditions, separation performance, saturation capacity, stripping performance, recycling performance and operating window in the acidic region, we believe that DOAM-PPA has great potential for HREEs separation and recovery applications.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Fazli Wahid,Shiyu Wang,Minhao Yan,Yaping Zhang,Xuezhi Dai,Qiang Tian
Sustainable methods for oil/water separation are highly important for worldwide industries due to their significant impact on different applications, such as treating industrial wastewater and addressing marine oil spills. However, current superhydrophobic membranes have difficulties in effectively removing organic matter from complex oily wastewater while maintaining large-scale oil/water separation. Herein, a copper mesh-based membrane was fabricated by a simple oxidation process, followed by sulfurization, and subsequently modified with stearic acid to develop a multifunctional superhydrophobic membrane. The fabricated membrane showed a high oil/water separation flux of ∼35,515 Lm −2 h −1 with an efficiency of >99.6 %. Meanwhile, the membrane exhibited recyclability, self-cleaning capability, mechanical durability, and stability under harsh conditions. The oil/water separation performance of the membrane is comparable to that of other advanced copper-based superhydrophobic membranes. Additionally, the membrane demonstrated Fenton-like rapid degradation of organic dyes, achieving a substantial degradation rate of 98.2 % within 24 min at 25 °C. The effects of sample dosage, H 2 O 2 content, initial pH of the solution, and reaction temperature were also investigated on the dye degradation. This work integrates catalysis with effective oil/water separation technologies, advancing the development of multifunctional membranes for wastewater treatment.
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JOURNAL OF SURFACTANTS AND DETERGENTS
·
2025
·
IF 1.8
Sihang Ma,Yuanyuan Wang,Qingfeng Hou,Yifeng Liu,Xiaoling Yi,Zhuoyan Zhu,Zhidong Chang
In the petroleum and petrochemical industries, oil sludge is a common contaminant that causes environmental pollution and resource wastage. Currently, recovering crude oil from oily sludge presents a significant challenge during processing. In this study, an amidinium bicarbonate-based CO 2 -responsive microemulsion was developed to effectively treat sludge and recover crude oil. The microemulsion system demonstrates a strong capability for oil solubilization. After the microemulsion treatment, the residual oil contents in the sludge can be reduced to as low as 2.93% (ME-1, n-butanol as cosurfactant) and 1.44% (ME-2, n-hexanol as cosurfactant). Complete oil/water phase separation can be achieved by introducing N 2 at 65°C.
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EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Jing Zhao,Haoyang Sun,Maoning Li,Dandan Li,Yu Nan,Zhi Zhang,Dazhi Sun
The low melt strength of degradable polymers makes the preparation and pore structure manipulation of degradable porous polymers challenging, limiting their widespread utilization. Herein, we report the adoption of a high internal phase emulsion (HIPE) templating method to prepare degradable polymer porous materials with distinct characteristics, such as high porosity, a multiscale porous structure, and degradability. The prepolymer employed as the continuous phase was prepared by grafting degradable polycaprolactone onto 2-ethyloctyl acrylate. Subsequently, the viscosity of the oil phase and the density difference and interfacial tension between the oil and water phases were adjusted via the type and concentration of the diluting solvent. The porosity, pore structure, and degree of pore interconnectivity in the polymerized HIPE were adjusted by considering the physicochemical properties of the diluent and their influence on the oil–water partition at the HIPE interface. Additionally, the mechanisms underlying cavity and window formation in the prepared degradable polymer porous materials were explored. The prepared materials exhibited good sound absorption performance in the frequency range of 3000–4000 Hz, excellent organic solvent absorption capacity, and underwent rapid hydrolysis, with a mass loss of approximately 30% within the first 3 days, which escalated to approximately 80% within 1 month. The study findings provide a valuable reference for the preparation and structural regulation of degradable polymer porous materials, thereby fostering their future applications.
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RSC Advances
·
2018
·Vol. 8
·期 11
·5695-5701
·
IF 2.936
Ze Wu,Lei Zhang,Ji Li,Xiaolu Zhao,Chunhui Yang
In situ hydrophobic polypropylsilsesquioxane aerogels (PSAs) were successfully synthesized via an organic–inorganic hybridization method by a sol–gel process, in which propyltriethoxysilane (PTES) and tetraethylorthosilicate (TEOS) were used as co-precursors. 29Si NMR and FTIR analyses indicated the high degree of condensation of the precursors and proved the attachment of propyl (–C3H7) groups in PSAs, respectively. By means of incorporating propyl groups, both mechanical robustness and in situ hydrophobicity were obtained. Meanwhile, the mechanical strength, contact angle and density obviously increased with the increase in propyl groups. Under optimized conditions, as-prepared PSA could endure up to a 70% maximum linear compression with few cracks. Benefiting from the robust structure and in situ hydrophobicity, PSAs showed high absorption capacities (8–10 times that of its own weight) and fast absorption properties (<20 s) for a wide range of organic solvents and could be reused at least 5 times.
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Metals
·
2025
·Vol. 15
·期 3
·299
·
IF 2.5
Feng Jiang,Shuai He,Wei Sun,Yuanjia Luo,Honghu Tang
The effective and environmental separation of chalcopyrite and molybdenite has long presented a challenge in mineral processing due to their similar floatability and close association at room temperature. This study explores the non-toxic 1-thioglycerol (1-TG) as a selective depressant for chalcopyrite–molybdenite flotation separation. An impressive separation effect was realized through single-mineral and mixed-mineral flotation experiments when using 1-TG as a depressant and kerosene as a collector. Contact angle measurements, zeta potential tests, and Fourier transform infrared spectroscopy (FT-IR) confirm the selective adsorption of 1-TG on the chalcopyrite surface, leading to enhanced surface hydrophilicity and the inhibition of collector adsorption. The depression mechanism is further elucidated through X-ray photoelectron spectroscopy (XPS), which demonstrates that it occurs via chemosorption between the thiol group in 1-TG and active iron sites on the chalcopyrite surface. These findings provide a potential efficient depressant for chalcopyrite–molybdenite flotation separation with low dosage, environmental friendliness, and human harmlessness.
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Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-17
·
IF 36.3
Gao Xin,Chen Ya,Zhen Zheng,Cui Lifeng,Huang Ling,Chen Xiao,Chen Jiayi,Chen Xiaodong,Lee Duu-Jong,Wang Guoxiu
This work provides a brand-new approach to the “conversion-protection” strategy to overcome the drawbacks of composite cathode interfaces.
The Mo 3 Ni 3 N not only makes it difficult for hydroxide groups (-OH) to survive on the surface but also allows the in situ surface reconstruction to generate the ultra-stable MoS 2 -Mo 3 Ni 3 N heterostructures after the initial cycling stage.
The Mo-Ni@NPCs/LCO/LPSC-based ASSLBs achieve high-capacity retention (90.62%) and excellent cycle life (1000 cycles).
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DESALINATION
·
2025
·
IF 9.8
Yifan Liu,Yufeng Miao,Zhuo Huang,Runxuan Wang,Yunyan Peng,Xiaolong Fang,Wenbo Che,Youming Yu
Oil/water emulsion wastewater is a typical industrial and domestic wastewater that is harmful to human health and the environment. However, it is still challenging to fabricate membrane materials for separating complex surfactant-stabilized oil/water emulsions from biomass in a facile and sustainable approach. Herein, paper industry waste lignin was prepared by self-assembly and hydrophobization into modified lignin nanospheres, which were sprayed onto delignified wood to develop a lignin-wood Janus membrane with superhydrophilic and superhydrophobic surfaces. The prepared Janus wood (JW) membrane maintains its selective wettability even under harsh conditions, demonstrating excellent durability and stability. Moreover, it can efficiently separate surfactant-stabilized oil-in-water (O/W) and water-in-oil (W/O) emulsions on demand, with a separation efficiency of >99 %. It is due to the distinct wettability and hierarchical structure of JW membranes, which feature three-dimensional interconnected layered micro/nano channels (tracheids and vessels) that enable multiple and continuous separation of oil/water emulsions. In addition, the JW membrane maintains a stable and efficient oil/water emulsion separation efficiency after 10 cycles, which offers an efficient, cost-effective, sustainable, and scalable approach for applications of all-wood-based separators in the oily wastewater treatment field.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiaohan Xing,Can Wang,Xiao Du,Fengfeng Gao,Xiaogang Hao,Abuliti Abudula,Guoqing Guan
A novel carbon nanotube combining bis(2-ethylhexyl) phosphate/tributyl phosphate membrane (MWCNTs-P204/TBP membrane) with dual-site extraction function was obtained by constructing a dense P204/TBP liquid phase extraction layer in a 3D porous MWCNTs membrane and proposed a “chemical-electrochemical dual site extraction” mechanism that consists both the chemical extraction dominated by proton exchange and electrochemical extraction dominated by electrochemical complexation pathways. The membrane was applied with an electrochemically switched ion membrane extraction (ESIME) process to realize continuous selective extraction/stripping of Nd 3+ . Model calculation and DFT simulations indicate that the mass transfer rate of Nd 3+ in the feed phase is 7.45 times higher than that of Dy 3+ under the action of the electric field, and the chemical softness of P204 and Nd 3+ extraction complex 15.15 is higher than that of Dy 3+ 2.73, the coupling effect of cell voltage and pulse potential can effectively facilitate the selective extraction and stripping of Nd 3+ by MWCNTs-P204/TBP membrane. The Nd 3+ flux as high as 7.31 μmol·m −2 ·s −1 with a separation factor β Nd 3+ /Dy 3+ of 9.56 was achieved even after five times enrichments. It manifested that the ESIME system with MWCNs-P204/TBP membrane provides a scalable process for the continuous selective separation of Nd 3+ from waste permanent magnets.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yunxiang Du,Zhuoyue Lan,Hang Li,Zhiyu Pu,Letian Hu
This study presents the application of dimercaptosuccinic acid (DMSA) as a selective depressant for chalcopyrite in copper-molybdenum separation, with a systematic investigation of its mechanisms of action. Single-mineral flotation tests showed that under weakly alkaline conditions, DMSA demonstrated significant depressant effects on chalcopyrite, while having a minimal impact on the recovery of molybdenite. In artificial mixed ore tests at a DMSA dosage of 40 mg/L, the molybdenite concentrate achieved a grade of 59.86 % with a recovery of 83.04 %, while the chalcopyrite concentrate achieved a grade of 0.49 % and a recovery of only 1.18 %. Using multi-scale characterization techniques, including contact angle measurement, SEM-EDS, zeta potential analysis, LEIS, FTIR, and XPS, it was found that DMSA interacts with metal sites on the chalcopyrite surface via its -SH groups, forming a hydrophilic chelating complex. This complex prevents the adsorption of kerosene effectively. Molecular dynamics simulations further validated that DMSA enhances the density of water molecules on the chalcopyrite surface. DMSA therefore selectively depresses the flotation of chalcopyrite, enabling the efficient separation of chalcopyrite and molybdenite.
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