LANGMUIR
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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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DOI
PubMed
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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PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
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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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yihui Ma,Fangli Zhang,Kun Chen,Yue Zhou,Zhaohui Wang,Zhaoliang Cui
As a new separation technology, membrane condensation requires simple equipment and mild operating conditions and has wide application potential and value in the process of water vapor recovery and chemical concentration and recovery. In this paper, we have proposed a new application process to incorporate nano-SiO2 into ECTFE membranes and apply them in the membrane condensation process. The fabrication of ethylene-chlorotrifluoroethylene copolymer (ECTFE)/SiO2 hybrid membranes is performed by incorporating hydrophobic nano-SiO2 during ECTFE membrane preparation, with varying ECTFE/SiO2 compositions achieved through SiO2 dosage adjustments. It can be found that SiO2 can change the structure of membrane during the process; hence, the impact of SiO2 removal after membrane formation on membrane performance was evaluated. SiO2 removal was conducted using a 1 mol/L hot alkali solution with continuous agitation for 24 h. A maximum water recovery rate of 24% (adequate for industrial water self-sufficiency) was attained at 2 wt % SiO2. Compared with the original membrane, the addition of hydrophobic nano-SiO2 significantly enhances the condensation performance of the ECTFE membrane.
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高影响因子
International Journal of Coal Preparation and Utilization
·
2025
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IF 2.1
Jinwei Diao,Peng Chen,Yong Huang,Xiaoqian Zhang,Ningbo Wang,Yanan Gao,Shaoxian Song,Jianbo Li
China heavily relies on foreign oil due to limited domestic resources. Oil shortages can be effectively alleviated through Indirect Coal Liquefaction (ICL), though its conversion efficiency is constrained by the coal’s ash content. Therefore, deep de-ashing of raw coal is vital for coal pyrolysis gasification. In this study, the methods for preparing high-purity coal and its impact on coal-to-oil conversion were investigated. When the stirring speed of the hydrophobic agglomerates reached 1800 r/min, the dosage of kerosene was 3 kg/t, and the dosage of methyl isobutyl carbinol (MIBC) and starch was increased to 300 g/t, high-purity coal with an ash content of 1.87% was successfully produced. The gangue mineral (including calcite, quartz and pyrite) removal was 69%. Compared to coal before de-ashing (with an ash content of 6.22%), the carbon conversion rate of high-purity coal in the pyrolysis gasification process increased by 2.28%, the relative CO content increased by 4.49%, and the relative CO2 content decreased by 3.69%, achieving a reduction in CO2 emissions. This is great significance in realizing the double control of carbon emission intensity and total emission.
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高影响因子
POWDER TECHNOLOGY
·
2025
·
IF 4.6
Qiming Zhuo,Decheng Chen,Zenan Wang,Wei Han,Yongming Song,Wenli Liu,Peng Xi
The separation of chalcopyrite and molybdenite in porphyry copper–molybdenum ores is challenging owing to their similar floatabilities, making the use of depressants necessary. Inorganic depressants are commonly employed in the flotation industry to increase the difference in hydrophobicity between chalcopyrite and molybdenite; however, these depressants pose significant environmental risks. Recently, novel organic depressants have attracted considerable interest because of their abundance and low toxicity. This study investigated the use of 2,5-dimercapto-1,3,4-thiadiazole (DMTD), an activator recently employed in copper oxide flotation, as a depressant for the separation of chalcopyrite and molybdenite. Micro–flotation experiments demonstrated that DMTD exhibits a notable selective depression effect, significantly suppressing the flotation of chalcopyrite without adversely affecting the flotation of molybdenite. Furthermore, DMTD maintained its depression effect on chalcopyrite flotation even in the presence of xanthate. Contact angle measurements were used to analyze changes in hydrophobicity, corroborating the micro–flotation results, while SEM-EDS elemental distribution maps further confirmed the selective adsorption of DMTD on the chalcopyrite surface. XPS and AFM analyses were conducted to elucidate the microscale interaction mechanism between DMTD and chalcopyrite. The specific interaction sites on the chalcopyrite surface were identified through changes in elemental binding energies, while the evolution of surface morphology revealed how DMTD interacts with chalcopyrite in the xanthate system.
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高影响因子
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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高影响因子
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