Materials
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2023
·Vol. 16
·期 19
·6613
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IF 3.4
Lixiao Xiao,Jirui Hou,Weiju Wang,Infant Raj
This work focuses on the development of a novel high-temperature microemulsion for enhanced oil recovery in tight oil reservoirs. Microemulsions are a type of mixture that has properties of both liquids and solids; they have shown significant potential for improving oil recovery through spontaneous imbibition. Herein, a high-temperature-tolerant lower-phase microemulsion using a microemulsion dilution method was developed. The properties and morphological characteristics of the microemulsion were evaluated and proposed a mechanism for enhanced spontaneous imbibition oil recovery using imbibition tests and CT scanning technology. The results of the study showed that the optimum concentration of the microemulsion was 0.2 wt% and that it had good thermal stability, small droplet size, lower interfacial tension, good wettability alteration ability, and minimum adsorption loss. The imbibition and CT experiments demonstrated that the reduction in oil/solid adhesion was due to the synergistic effect of IFT reduction and wettability alteration and the ability to increase the imbibition distance through a larger self-driving force. The study concludes that the solubilization coefficient and self-driving force were defined and calculated to quantitatively analyze the imbibition mechanisms and the results showed that the reduction in oil/solid adhesion was due to the synergistic effect of IFT reduction and wettability alteration and the ability to increase the imbibition distance through a larger self-driving force.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 18
·14085
·
IF 5.6
Yue Wu,Guangyuan Lu,Ping Xu,Tian C. Zhang,Huaqiang He,Shaojun Yuan
The pursuit of superhydrophilic materials with hierarchical structures has garnered significant attention across diverse application domains. In this study, we have successfully crafted Ni-Mn LDHs@CuC2O4nanosheet arrays on a copper mesh (CM) through a synergistic process involving chemical oxidation and hydrothermal deposition. Initially, CuC2O4nanosheets were synthesized on the copper mesh, closely followed by the growth of Ni-Mn LDHs nanosheets, culminating in the establishment of a multi-tiered surface architecture with exceptional superhydrophilicity and remarkable underwater superoleophobicity. The resultant Ni-Mn LDHs@CuC2O4CM membrane showcased an unparalleled amalgamation of traits, including superhydrophilicity, underwater superoleophobicity, and the ability to harness photocatalytic forces for self-cleaning actions, making it an advanced oil-water separation membrane. The membrane’s performance was impressive, manifesting in a remarkable water flux range (70 kL·m−2·h−1) and an efficient oil separation capability for both oil/water mixture and surfactant-stabilized emulsions (below 60 ppm). Moreover, the innate superhydrophilic characteristics of the membrane rendered it a prime candidate for deployment as a supercapacitor cathode material. Evidenced by a capacitance of 5080 mF·cm−2at a current density of 6 mA cm−2in a 6 M KOH electrolyte, the membrane’s potential extended beyond oil-water separation. This work not only introduces a cutting-edge oil-water separation membrane and supercapacitor electrode but also offers a promising blueprint for the deliberate engineering of hierarchical structure arrays to cater to a spectrum of related applications.Keywords:superwetting mesh;self-cleaning;oil/water separation;supercapacitors
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Chemical Engineering and Processing-Process Intensification
·
2023
·
IF 4.3
Hong Shi,Weihua Zhu
Excessive amounts of free acids will significantly reduce the quality of heavy alkylbenzene sulfonic acid and its downstream products. To get rid of the excess free acids in heavy alkylbenzene sulfonic acid, a novel three-step deacidification technique called barium salt neutralization method was developed with the aware of “process intensification” in this work. Various factors affecting the deacidification process were thoroughly studied. Results show that using this deacidification method, the free acids content in heavy alkylbenzene sulfonic acid can be reduced from 1.5% to less than 0.1% at the producing condition of room temperature, atmospheric pressure, reusable green solvent, and short time. The free acids removal rate and recovery rate of feed can reach to 96.7% and 95.3%, respectively. It has been demonstrated that the barium salt neutralization method is an effective way to lower the amount of free acids in heavy alkylbenzene sulfonic acid, and can be readily turned into practical applications.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Quan Shen,Yue Jiang,Shanzhu Guo,Lin Huang,Haibo Xie,Long Li
Gradual-transition wettability gradient is a highly promising wettability profile for driving fluid directionally transport across the thickness of porous membranes. However, the fabrication of such membranes is still challenging, limiting their further application in various fields. Here, we report a one-step strategy to fabricate membranes with gradual-transition wettability gradient (GMs) by programmed in-line-blending electrospinning polymers (poly (ε-caprolactone) (PCL) and poly (ε-caprolactone-co-ethylene glycol) (PCE)) with compatible segments but obviously different wettabilities. The results demonstrate that two opposite gradual-transition wettability gradients across the thickness are successfully fabricated in GMs, and resulting GMs exhibit excellent directional liquid transport property that can only allow liquid drops and continuous flow to permeate across the thickness in the direction from the lyophobicity-rich side to the lyophilicity-rich side while blocking the permeation process in the reverse direction. Additionally, no matter under high or low gravity conditions, the directional fluid transport flux of membranes with different wettability profiles improves as the gradient layers increase from 3 to 78, corresponding to the transition of wettability profile from 3-layered Janus wettability to 78-layered gradual-transition wettability. As a result, GMs achieve much faster directional fluid transport fluxes than membranes with abrupt-change wettability gradient (AMs) and homogeneous wettability, owing to the acceleration of internal driving forces originating from the gradual-transition wettability gradient. Based on this particular property, GMs also show great potentials in ultrafast directional floating oil collection and energy-saving directional separation of oil/water mixtures, offering new insight for designing and fabricating wettability-anisotropic porous membranes with potential and versatility in multiple applications.
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LANGMUIR
·
2023
·
IF 3.9
Yu Lang,Jingjie Zhou,Jinyuan Sun,Huibin Liang,Ke Zhang,Chunyu Wang,Yuqi Liu,Tao Geng
Surfactant reduces the surface tension of liquids, resulting in improved emulsion stability, and there is great interest in pesticide additives. Ethoxylate is often used as a pesticide emulsifier. However, the degree of ethoxylation and the existence of dioxane byproducts can significantly affect the performance of emulsifiers. Here, a series of polyoxyethylene tallow amines with the addition of different numbers of ethylene oxide (EO) were synthesized and characterized. Their physical and chemical performances were measured. The ability of POEA as a surfactant to reduce water surface tension and the surface adsorption of molecules were assessed based on the static and dynamic surface tensions. The results show that the surfactant molecules preferentially form a saturated adsorption layer in solution, and the mixed-diffusion-kinetics mechanism dominates the adsorption process. With the increase of the EO addition number, the emulsifying property of POEA increases, while the wetting property gradually decreases and the contact angle increases. These results can provide a basis for the selection of pesticide additives. At the same time, the mechanism of removing dioxane by ethoxylate is described, and a simple and low-consumption method is put forward to reduce the dioxane content. It provides a new idea for the removal of dioxane.
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JOURNAL OF SURFACTANTS AND DETERGENTS
·
2021
·Vol. 24
·期 2
·199-208
·
IF 1.902
Yun Bai,Chunsheng Pu,Shuai Liu,Xiang Gao,Gang Chen
The purpose of this paper is to comprehend in-depth the effect of the surfactant structure on its and physicochemical properties such as surface/interfacial properties, foam stability, wettability, and biodegradability. To this end, quaternary ammonium Gemini surfactants, alkanediyl-α,ω-bis[(2-hydroxypropyl)dodecylammonium] dibromide (abbreviated as C m -n-C m [iso-Pr(OH)] 2 with m = 12, 14 and n = 2, 3, 4) were synthesized via substitution and quaternization reactions, and their chemical structures were characterized by Fourier transform infrared (FT-IR) and nuclear magnetic resonance ( 1 HNMR) spectroscopies. The results showed that with the decrease of the spacer length, the surface tension was reduced more strongly, and with the increase of the alkyl tail length, micelles were more easily formed. Besides, the highest surface activity of C 14 -2-C 14 [iso-Pr(OH)] 2 was observed by increasing NaCl concentration to 200 g L −1 . The temperature had a great influence on thermodynamic parameters of the adsorption and micellization. The interfacial tension between 0.26 g L −1 C 14 -2-C 14 [iso-Pr(OH)] 2 solution and oil could reach 0.022 mN m −1 . An elongation of the spacer chain in C 14 -n-C 14 [iso-Pr(OH)] 2 was unfavorable to foam stability. Besides, the oil-wetted core, which was aged in 0.6 g L −1 C 14 -2-C 14 [iso-Pr(OH)] 2 solution, exhibited more hydrophilicity. C m -n-C m [iso-Pr(OH)] 2 surfactants produced higher biodegradable rates in river water (≥ 90% after 28 days) than the biodegradable surfactant of international recommendation (71% after 28 days) at 30 °C.
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MINERALS ENGINEERING
·
2021
·
IF 4.765
Hai Yan,Bingqiao Yang,Huanyu Zhu,Pengliang Huang,Yangjia Hu
A small non-toxic compound dithiothreitol (DTT) was introduced as an environmental-friendly chalcopyrite depressant in Cu-Mo flotation separation. The separation performances were studied via flotation tests. The adsorption mechanism was explored by contact angle, Zeta potential and X-ray photoelectron spectroscopy (XPS) measurements. The flotation results manifested that DTT exhibited strong depression ability on chalcopyrite, but barely influenced the floatability of molybdenite. The contact angle and Zeta potential measurements indicated that DTT mainly adsorbed on chalcopyrite and rendered its surface hydrophilic, while it hardly adsorbed on molybdenite. XPS analysis confirmed that DTT might complex with Cu atoms on chalcopyrite surfaces via the thiol groups. This study demonstrated that DTT was a promising alternative for Na 2 S in Cu-Mo separation, which was more effective and environmentally compatible.
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MINERALS ENGINEERING
·
2021
·
IF 4.765
Xiaoxiao Qiao,An Liu,Zhihong Li,Jinchuan Fan,Panpan Fan,Minqiang Fan
Dodecylamine (DDA) can only be used with acidification in the reverse flotation of iron ore. To solve this problem, this paper proposed a novel water-in-oil microemulsion with DDA prepared using one or two of AEO-3, OP-10, and Tween-80 & Span-80 as the surfactants, 2-octanol as the cosurfactant, and DDA and kerosene as the oil phase. The freezing point, surface tension, droplet size distribution, and zeta potential were determined for the DDA microemulsion. The results showed that the freezing point of the produced DDA microemulsion can be reduced to –12.5 °C. Moreover, the surfaces of its droplets dispersed in aqueous solution are positively charged at pH values less than 10.0. The flotation performance of the DDA microemulsion was investigated by flotation tests. From the results, DDA microemulsion exhibited good dispersibility and surface activity, thereby confirming its ability to effectively reduce air–water interfacial tension. In addition, it was found to have good adaptability to temperature and pulp pH, yielding a magnetite concentrate with 68.54% Fe and 3.60% SiO 2 from magnetite with 64.93% Fe and 9.12% SiO 2 using 45 g/t DDA microemulsion. Therefore, the proposed DDA microemulsion can be used as an efficient collector in the reverse flotation of magnetite.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Lei Kang,Qiao Zeng,Lanjie Shi,Xiaoming Zhou,Mengzhou Wang,Shan Wan,Longfei Song,Bokai Liao,Xingpeng Guo
Low-cost and scalable fabrication processes are needed to prepare efficient superhydrophobic materials, particularly for oil/water separation and metal protection against severe oil spills and metal corrosion. Here, an effective oil/water separation mesh with long-lasting acid/base durability and corrosive resistance is reported. In this work, the mesh was fabricated by simply spraying nano soil particles cross-linked with melamine resin and impregnating them with polyethylene (PE) solution. The multi-layered morphology obtained from the spraying and impregnating process which provides the unique wetting properties for the stainless steel (SS) mesh, such as superhydrophobicity and low water adhesion. Also the low chemical activity of alkyl sp 3 carbon-hydrogen bonds provides acid/base resistance for the manufactured material. By utilizing these unique properties, not only can gravity-driven efficient oil/corrosive fluid separation be achieved, but the fabricated superhydrophobic stainless steel (SSS) mesh retains high separation efficiency (> 99%) and superhydrophobicity (water contact angle, WCA > 150°) in reuse process of wastewater in treated oil. More importantly, this excellent protection can effectively reduce the corrosion rate of the mesh by more than two orders of magnitude (SS mesh i corr 1.82 × 10 −8 A·cm −2 ; SSS mesh i corr 9.84 × 10 −11 A·cm −2 ) which providing a long-lasting protection even after 16 days of immersion in 3.5 wt% NaCl solution. All in all, the easy operation, acid/base resistance, high separation efficiency, and corrosion inhibition efficiency of the SSS mesh give them great potential for oil/water separation and metal protection applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ruibing Bai,Junfeng Wang,Daoguang Wang,Yanqiang Zhang,Junjie Cui
The high acidity of stripping is one of the major problems that hinder the industrialization of the tributyl phosphate (TBP) + FeCl 3 system for lithium extraction from the salt lake brines with high Mg/Li ratio. In this study, a novel solvent extraction system, trialkylmethylammonium di(2-ethylhexyl)orthophosphinate ([N 1888 ][P 507 ]) + TBP + FeCl 3 , was developed to significantly reduce the difficulty of stripping and simplify the extraction process. The conditions of extraction and stripping were systematically studied in the present work. The results showed that Li + extraction efficiency could reach 61% under the optimal extraction parameters and Li + stripping ratio was 90% with a relative mild conditions of O/A = 10:1, [HCl] aq = 1.5 mol·L –1 . Also, combined with experimental results, FT-IR analysis, and UV analysis, the possible mechanisms of lithium extraction and stripping were put forward. Li + was extracted from the aqueous phase through the formation of [Li·2TBP][FeCl 4 ] adduct, meanwhile [N 1888 ][P 507 ] was just slightly involved in the extraction step. In the stripping procedure, the interaction between [FeCl 4 ] − and [Li·2TBP] + might be destroyed, and new possible complexes, [Li·2TBP] + , and [FeCl 4 ·TBP·P 507 ] 2− /[FeCl 4 ·P 507 ] 2− were formed in the organic phase. Additionally, the extraction efficiency of Li + remained above 70% while the organic phase was reused for six cycles. Compared with the traditional system, the addition of [N 1888 ][P 507 ] resulted in a slight decrease of Li + extraction efficiency (about 5%), the stripping acidity significantly reduced from 6 mol·L –1 HCl to 1.5 mol·L –1 HCl. This new extraction system showed a promising performance in selective extracting and easy stripping in lithium separation from the salt lake brines with high Mg/Li ratio.
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FUEL
·
2021
·
IF 6.609
Yong Zhang,Hongzheng Zhu,Jinbo Zhu,Fan Yang,Hailing He,Zhiqian Qin,Qinghui Shi,Gaochao Pan
Understanding the effect of ions on the interfacial tension (IFT) between kerosene and water is a prerequisite to predicting kerosene–mineral adsorption. Using a high-speed motion acquisition system, we investigated the height evolution of the catenoid with different IFTs. As the IFT increased, the height of catenoid first increased slowly and then increased sharply. The catenoid height of the oil–water interface was larger than was that of the water–gas, whereas the IFT was the opposite, indicating that height was related not only to the IFT, but also to the viscosity of the phases when the ring diameter was constant. The cation valence had a significant influence on the IFT. Interaction between the cation and water molecules led to the generation of cationic clusters. The literature indicates that the higher the valence of ion the easier it would be to form a cationic cluster, resulting in decreasing of the IFT. Our results matched these findings. At low ionic concentration , the IFT increased as the ion concentration increased. At high ionic concentration, the IFT decreased with increasing concentration because of the ionic pairs. The results of molecular dynamics simulation showed that the water molecules only moved toward kerosene molecules without ions. The hydrophilic groups in kerosene molecules spontaneously arranged toward the water–oil interface, whereas the hydrophobic groups stayed away from this interface. The water molecules burst into the kerosene phase in the presence of ions. The number of water molecule entering the kerosene phase increased with increasing ion concentrations. Our results can provide valuable insight into the development of technology for surfactant adsorption and mineral flotation .
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MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Fan Huang,Qiang Li,Gengsheng Ji,Jie Tu,Na Ding,Qianqian Qu,Guanhui Liu
To achieve cheap and highly efficient separation of oil/water mixtures, a superhydrophobic ployvinylidene fluoride (PVDF) and microcrystalline cellulose (MCC) composite membrane was prepared by a two-step method, in which MCC and PVDF were directly mixed to form the membrane at 25 °C, then lauric acid was induced on surface of the membrane using grafting method. Then membranes were characterized using field emission scanning electron microscope (SEM) Attenuated total reflection infrared spectra (FTIR-ATR). Thermogravimetric analysis (TGA), water contact angle (WCA). The water contact angle of the superhydrophobic membrane in air is 153° ± 2° and the separation efficiency for different immiscible oil/water mixtures is above 99%. The superhydrophobic membrane (119.6 mg/g loading amount of lauric acid) has a high flux of 8800 L m −2 h −1 for n-hexane-water mixture and stable separation performance to kerosene-water mixture, which can be reused 20 times without decreasing the separation efficiency. Meanwhile, surfactant-stabilized emulsions can be effectively separated using the superhydrophobic membrane under gravity. Besides, the superhydrophobic film can be degraded in soil.
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