JOURNAL OF MOLECULAR LIQUIDS
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2023
·
IF 6
Jian Zhang,Xiujun Wang,Qiang Liang,Ming Duan,Shenwen Fang,Chunsheng Zhang,Jiaqing Chen
Hydrophobically modified polyacrylamide (HMPAM) is one of the commonly used polymers for polymer flooding. Because it is water soluble, there are many reports on the impact of HMPAM on the stability and treatment of produced water (it is O/W emulsion), but few reports on its influence on the demulsification of W/O crude oil emulsion. In this paper, firstly, three types of HMPAM containing cationic, anionic, and nonionic hydrophobic monomers (abbreviated as P(AM-AANa-N)Cn, P(AM-AANA-S)Cn, and P(AM-AANA-O)Cn, respectively) were synthesized; Then, demulsification experiments and interface behavior experiments (including dynamic interfacial tension, dilatational rheology and dynamic coalescence time measurement) were conducted to investigate the influence of HMPAM on the demulsification performance of a W/O heavy oil emulsion demulsifier D1. The demulsification results showed that HMPAM reduced the dehydration speed of D1, the type of hydrophobic monomer and the length of hydrophobic chain in HMPAM can affect the final water separated of D1. P(AM-AANa-S)Cn, P(AM-AANa-N)Cn with long hydrophobic chain, and P(AM-AANa-O)Cn with short hydrophobic chains had the negative effect on performance of D1. The results of dynamic interfacial tension experiments indirectly showed that HMPAM had the influence on the D1′s conformation and speed of rearrangement at the W/O interface during the water droplet coalescence process, thereby affecting the reduction of elastic modulus ( G ′ ) of W/O interface and the coalescence rate of water droplets. When there was HMPAM in water, the coalescence time of water droplets increased, resulting in the decrease of dehydration rate. At the meantime, HMPAM had an impact on the lg ( G 1 ′ / G demulsifier ′ ) / lg G 1 ′ , thereby affecting the final water separated of D1.
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JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Zhaorui Li,Simeng Gan,Xiaofeng Huang,Fei Wang,Xin Sun,Kai Li,Ping Ning
Preparation of Highly Crystalline Fe₂O₃-Based Catalyst (WCS600) from Copper Slag. • Thermal Reconstruction Tunes Fe–O Coordination and Oxygen Vacancies in WCS600. • Oxygen vacancies promote nitrate adsorption and activation and construct the Fe–OH working interface. • ICCUS-derived H₂ supply can reduce the NH₃ production cost to below 1.15 $ kg -1 . The synergistic treatment of copper slag valorization and nitrate wastewater remediation represents a critical pathway toward the high–value utilization of metallurgical solid waste and nitrogen resource recovery. This study employs a strategy synergistically coupling thermal reconstruction with surface defect engineering to convert the Fe–containing phases in copper smelting slag into an Fe₂O₃–based electrocatalyst, designated as WCS600. At −0.6 V vs. RHE, WCS600 achieves an NH₃ production rate of 7.16 mg h⁻¹ cm⁻² and a FE NH3 of 91.56%. Characterization and DFT calculations reveal that cathodic polarization induces the electrochemical reconstruction of surface oxygen vacancies, dynamically generating an interface enriched with mixed–valence Fe²⁺/Fe³ ⁺ species and hydroxylated Fe–OH. This interface promotes the directional conversion of nitrogen–containing intermediates, thereby enhancing NH₃ selectivity. In a simulated acidic smelting wastewater system, WCS600 exhibits excellent stability and resistance to interference, with Fe leaching remaining below the safety threshold. Further techno–economic analysis indicates that, under specific scenarios coupling low–carbon hydrogen sources, the NH₃ production cost of WCS600 could be reduced to below 1.15 $ kg⁻¹ . This study provides a theoretical foundation and practical guidance for the synergistic resource–oriented treatment of solid waste and nitrate wastewater, as well as for the development of scalable electrochemical ammonia synthesis. Download: Download high-res image (227KB) Download: Download full-size image
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Yufan Huang,Jiaofen Lin,Bihua Shen,Chenmin Zheng,Bingqing Huang,Jinmei Zou,Guoguang Zhang,Peng Fei
In this study, chlorogenic acid-chitosan (CA-CS) copolymers were prepared with varying Chitosan (CS): chlorogenic acid (CA)ratios and characterized for their water solubility, antioxidant capacity, and emulsions stability. Results showed that CA-CS samples exhibited up to 90.5 % increase in DPPH scavenging efficiency and 20 % increase in hydroxyl radical scavenging efficiency compared to CS alone. CA-CS copolymers used to stabilize oil in water (O/W) emulsions, which were evaluated for their potential in encapsulating and protecting β-carotene. Microscopic observations revealed homogeneous spherical droplets in stable emulsions, suggesting effective interfacial structures. The selected CA-CS-stabilized O/W emulsions demonstrated encapsulation efficiencies of 74.8 % and 75.26 % for β-carotene. The CA-CS stabilized O/W emulsions provided the most effective protection against β-carotene degradation under UV exposure, retaining over 80 % of β-carotene content after 12 h of testing. These findings indicate that CA-CS-based O/W emulsions show promise as carriers and protectors for bioactive compounds, due to their improved antioxidant capacity, emulsions stability, and protection against degradation.
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Surfaces and Interfaces
·
2023
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IF 6.2
Hongwei Su,Xin Chen,Hua Hu,Xiaofang Zhang,Guilong Yan,Zhenyu Li,Li Wang,Dong Xiang,Chunxia Zhao,Yuanpeng Wu,Yong Du,Jingyu Chen
Filtration membranes (FMs), with high separation efficiency, robust/comprehensive anti-fouling capacities, and highly anti-corrosive performance, are highly desirable for practical complex oil/water emulsions purification, but still a challenge unsolved. Herein, FM containing oxygen vacancy engineered MnO 2-x nanolayer on the outer surface of carbon nanofibrous membrane has been fabricated to address this challenge. Given the existence of oxygen vacancy of the MnO 2-x nanolayer, multiple functions have been realized simultaneously: (i) stronger water affinity than oils; (ii) robust anti-corrosion towards diverse corrosive media (e.g., 1M HCl, 1M NaOH, 10 wt % NaCl, N,N-dimethylformamide, and dimethyl sulfoxide); (iii) efficient degradation of organic dyes (methylene blue and rhodamine B) via photocatalytic process; (iv) comprehensive anti-fouling capacities for oils, organic dyes, bovine serum albumin, and humic acid . Consequently, our FM displays superior separation efficiencies (≥ 99.3 %) towards complex oil/water emulsions with high flux (the maximum: 41,557 ± 350 L m −2 h −1 bar −1 ), robust and comprehensive anti-fouling capacity for different pollutants (e.g., oils, bovine serum albumin, humic acid, and organic dyes) via simple water rinse or photocatalytic degradation to 100 % recover permeation flux for 40 cycles. These outstanding functions make our FM with great potential in practically complex O/W emulsions treatments under harsh conditions.
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BIOORGANIC & MEDICINAL CHEMISTRY
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2021
·
IF 3.641
Xiao-San Li,Tang-Ji Chen,Zhi-Peng Xu,Juan Long,Miao-Ying He,He-Hui Zhan,Hai-Cai Zhuang,Qi-Lin Wang,Li Liu,Xue-Mei Yang,Jin-Shan Tang
In order to study the structure–activity relationship (SAR) of C 21 -steroidal glycosides toward human cancer cell lines and explore more potential anticancer agents, a series of 3 β -O-neoglycosides of caudatin and its analogues were synthesized. The results revealed that most of peracetylated 3β-O-monoglycosides demonstrated moderate to significant antiproliferative activities against four human cancer cell lines (MCF-7, HCT-116, HeLa, and HepG2). Among them, 3β-O-(2,3,4-tri-O-acetyl-β-L-glucopyranosyl)-caudatin ( 2 k ) exhibited the highest antiproliferative activity aganist HepG2 cells with an IC 50 value of 3.11 μM. Mechanical studies showed that compound 2k induced both apoptosis and cell cycle arrest at S phase in a dose dependent manner. Overall, these present findings suggested that glycosylation is a promising scaffold to improve anticancer activity for naturally occurring C 21 -steroidal aglycones, and compound 2 k represents a potential anticancer agent deserved further investigation.
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Electrocatalysis
·
2023
·
IF 3.1
Zhao Hongyu,Zhang Hao,Huang Ruoyu,Wang Jianmin,Cai Jiajia,Hu Jing,Chen Zhijie,Li Yongtao,Li Haijin
Developing excellent electrocatalysts is a significant step in accelerating the widespread implementation of the electrochemical hydrogen evolution reaction (HER). MoS 2 is one of the promising alternatives to platinum-based catalysts, while its HER activity is far from Pt due to the lack of active sites. It is urgent to develop a novel strategy to activate the basal planes of MoS 2 for enhancing the HER activity. Herein, a facile hydrothermal method with a low-temperature H 2 O 2 etching method is developed to fabricate MoS 2 with O-doped and S-vacancy dual defects. The dual defects MoS 2 nanosheet demonstrates remarkable hydrogen evolution reaction (HER) activity, achieving 10 mA cm −2 with a small overpotential of around 143 mV in 0.5 M H 2 SO 4 . Graphical Abstract
Construct dual-defect MoS2 via a facile hydrothermal method and mild H2O2 etching process.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Yi Tian,Yunlong Yue
Multicolor carbon dots (CDs) with high stability are desired for various light emitting devices and bio-images. In this paper, the green and red emitting CDs were created by o -phenylenediamine and terephthalic acid (TA) as precursors at different temperatures via a solvothermal reaction. An efficient response surface methodology is developed to analyze the formation mechanism. Using optimized conditions, the green and red emitting CDs reveal photoluminescence quantum yields (PLQYs) of 34.0 % and 26.8 %, respectively. The result of response surface method indicates that temperature, precursor concentration, and TA amount significantly influence the PLQYs of the CDs. The formation mechanism of the CDs was proposed by analyzing solvatochromism phenomena, oxidation processes , and fluorescence lifetimes . Initially, green CDs with surface state luminescence were formed followed by the subsequent generation of red CDs exhibiting molecular and carbon core state emission during oxidation. These CDs reveal high stability, in which the PL intensity almost remained unchanged after 7 months. Furthermore, three-color CDs/polymer films (λ em = 500, 536, and 568 nm) were successfully fabricated by using these two types of CDs. Sample 180-CDs/polystyrene film had photochromic properties, while other films had good photostability.
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Food Bioscience
·
2023
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IF 5.2
Mei Bai,Jinming Dai,Wei Hu,Changzhu Li,Haiying Cui,Lin Lin
This study investigated the use of Litsea cubeba essential oil (LC-EO) as an anti-virulence agent targeting listeriolysin O (LLO) of Listeria monocytogenes ( L. monocytogenes ). The hemolysis assay showed a significant decrease in the hemolytic activity of LLO by 90.7% and 70.2% after exposure to 500 μg mL −1 LC-EO or 700 μg mL −1 citral (the main component of LC-EO), respectively. This suggested that citral plays a major role in the anti-virulence function against LLO. The experiments including UV–visible absorption spectroscopy , fluorescence quenching and three-dimensional fluorescence spectroscopy demonstrated that exposure to citral leads to significant changes in the conformation of LLO, potentially resulting in the unfolding of its structure and the formation of a ground-state complex. Synchronous fluorescence spectra analysis indicated that the binding site of citral could be the undecapeptide region of LLO. Additionally, the results of molecular docking and the acid-base effect experiment of different aldehydes and phenols revealed that the cysteine residue of LLO and the α, β-unsaturated aldehyde of citral are likely to form a covalent bond through Michael addition . This interaction is believed to be the primary reason for the loss of hemolytic activity. As a result, this work provides a new approach for the development of LLO-targeting anti-virulence agents and holds promise for expanding the application of LC-EO in the field of food microbiological safety.
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JOURNAL OF CATALYSIS
·
2021
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IF 7.92
Zean Xie,Zhi Li,Peng Tang,Yangyang Song,Zhen Zhao,Lian Kong,Xiaoqiang Fan,Xia Xiao
Recently, the coordinatively unsaturated metal-O Lewis acid-base pairs of metal oxides are found to be able to activate the C–H bond of light alkane efficiently. For the inert crystal Al 2 O 3 , we found that the surface oxygen vacancy amount of Al 2 O 3 can be controlled by pretreatment of CO reduction, and the nearby coordinatively unsaturated Al-O (Al cu -O) pairs can effectively catalyze propane dehydrogenation (PDH). The C 3 H 6 formation rate of γ/δ-Al 2 O 3 is in line with the concentration of oxygen vacancies. The experiments and DFT calculations illuminate the importance of oxygen vacancy on the surface of Al 2 O 3 for PDH reaction. The consumption of lattice oxygen reduces the one coordination number of the bonding Al, the formed Al cu -O as defective acid-base pairs, can be an effective way to tune the adsorption energy of the intermediates and the barriers of key steps (the first C H activation and H 2 formation) to enhance the performance of PDH through both site-dependent concerted and stepwise mechanisms.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 31
·42694-42705
·
IF 4.223
Wu Peng,Liu Yiqing,Fu Yongsheng,Zhou Gaofeng,Deng Jiewen
The solubilization laws of pollutants in micelles and their separation efficiency are very important in the successfully efficient application of micellar enhanced ultrafiltration (MEUF). The solubilization behavior of o -toluidine (OT) and tricyclazole (TC) into sodium dodecyl sulfate (SDS) micelles in MEUF was studied using nonlinear equation sets for concentration analysis, which resolved the issue on the overlap of absorption spectra of multicomponent compounds restricting the application of conventional ultraviolet (UV) spectroscopic method. The solubilization isotherms for both pollutants could be best explained by the Langmuir-Freudlich model ( R 2 >0.99) followed by the modes of Langmuir and Freudlich, inferring the complexity of solubilization mechanism and solubilization advantage of monolayer over multilayer. The calculated thermodynamic parameters ( ΔG 0 , ΔH 0 and ΔS 0 ) indicated that this process was endothermic and spontaneous. The solubilization of OT and TC well followed the pseudo second-order and pseudo first-order kinetics, respectively. The separation and recovery of SDS solubilizing these two pollutants were also investigated through lowering solution temperature to 2 °C followed by centrifugation. The best recovery rate of about 66% for SDS was achieved containing 10 and 5% of each initial amount of OT and TC, respectively, at near-neutral solution pH value. The recovery of SDS could decrease to some extent under alkaline and acidic conditions.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
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IF 2.694
Aocong Guan,Yucong Nie,Yue Shen,Sile Shi,Weiping Luo
In this study, the solubility of phthalic acid and o-toluic acid in propionic acid, N-methylformamide, N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAC), dimethyl sulfoxide (DMSO), N-methylpyrrolidone (NMP), and acetonitrile are measured under atmospheric pressure (101.3 kPa) by the method of laser dynamics. The experimental temperature range is 286.35 to 338.75 K. The measured data shows that the solubility of phthalic acid and o-toluic acid increases with increasing temperature in the temperature range studied. The experimental data are correlated by the Apelblat model, the λh model, and the modified nonrandom two liquid activity coefficient model, and the calculated solubility is in agreement satisfactorily with the measured results. Akaike information criterion analysis results show that the Apelblat model was the most suitable model to correlate the solubility of phthalic acid in propionic acid, N-methylformamide, and DMSO and the solubility of o-toluic acid in propionic acid, DMSO, and NMP; the λh model was the most suitable model to correlate the solubility of phthalic acid in DMF and DMAC and the solubility of o-toluic acid in N-methylformamide and DMF; and the modified NRTL model was the most suitable model to correlate the solubility of phthalic acid in NMP and acetonitrile and the solubility of o-toluic acid in DMAC and acetonitrile.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Hong Li,Xinzhu Wen,Feng Shao,Shiwei Xu,Chao Zhou,Yafei Zhang,Hao Wei,Nantao Hu
Rational materials design is critical to develop advanced electrodes for high-performance sodium-ion battery. In this work, a well-designed structure with interlayer-expanded molybdenum disulfide (MoS 2 ) vertically anchored on graphene substrates (v-MoS 2 /rGO) is achieved by one-pot hydrothermal synthesis . The vertical anchored MoS 2 and high conductivity graphene sheets provide a good path for electrons/ion transfer. More importantly, the direct linkage of O from functional group on graphene oxide (GO) with edge S of MoS 2 (C-O-S) is constructed, which can maintain the stability of the v-MoS 2 /rGO electrode and enhance its electrons transport rate for the high-rate performance and long cycle life. The assembled sodium-ion battery shows high rate performance (129.2 mAh g −1 at 10 A g −1 ) and long cycling stability (251.2 mAh g ‐1 −1 at 2 A g −1 after 1000 cycles with an ultra-low degradation of 10.9 μAh g −1 per cycle). The excellent performance makes the designed structure a fascinating anode for sodium battery.
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