Materials
·
2023
·Vol. 16
·期 2
·840
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IF 3.4
Wenwen Wang,Xinyi Bai,Xiaochu Yuan,Yumin Liu,Lin Yang,Fangfang Chang
The compositions and surface facets of platinum (Pt)-based electrocatalysts are of great significance for the development of direct alcohol fuel cells (DAFCs). We reported an approach for preparing ultrathin PtnCo100−nnanowire (NW) catalysts with high activity. The PtnCo100−nNW alloy catalysts synthesized by single-phase surfactant-free synthesis have adjustable compositions and (111) plane and strain lattices. X-ray diffraction (XRD) results indicate that the alloy composition can adjust the lattice shrinkage or expansion of PtnCo100−nNWs. X-ray photoelectron spectroscopy (XPS) results show that the electron structure of Pt is changed by the alloying effect caused by electron modulation in the d band, and the chemical adsorption strength of Pt is decreased, thus the catalytic activity of Pt is increased. The experimental results show that the activity of PtnCo100−nfor the oxidation of methanol and ethanol is related to the exposed crystal surface, strain lattice and composition of catalysts. The PtnCo100−nNWs exhibit stronger electrocatalytic performance for both methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR). The dominant (111) plane Pt53Co47exhibits the highest electrocatalytic activity in MOR, which is supported by the results of XPS. This discovery provides a new pathway to design high activity, stability nanocatalysts to enhance direct alcohol fuel cells.Keywords:direct alcohol fuel cells;nanowire;nanocatalysts;alloy effect;lattice strain
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Li Wang,Yi Zeng,Hongsheng Lu,Zhiyu Huang,Ya Liu
Organogelators and hydrogelators which belong to low-molecular-weight gelators (LMWGs) have attracted considerable attention due to various practical applications. Whether organogelators or hydrogelators, they can congeal single oil or water phase. However, gelators capable of gelation at oil/water interface have thus far remained unexplored. Herein, we report a class of surface-active ionic liquids (SAILs) based on dimethylcyclohexylamine and fatty acids. They can form high-strength gels at the oil/water interface instead of in single oil or water phase. These molecules spontaneously aggregate at oil/water interface, and then self-assemble into lamellar liquid crystalline structure, as evident from POM and SAXS analysis. Rheology analysis shows that these gels are of very high viscosity, strength and stability. These unique characters make these SAILs can effectively block the oil–water interface, which has potential application in oilfield development or oil leaks from underwater tubes.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Miao Ma,Jidong Wang,Xiaotong Yang,Yixin Qu
In this paper, the solubility of clotrimazole, an antifungal drug, in 10 alcohols (n-propanol, iso-propanol, n-butanol, iso-butanol, sec-butanol, n-pentanol, iso-pentanol, n-hexanol, n-heptanol, and n-octanol) and 6 esters (methyl acetate, ethyl acetate, n-propyl acetate, n-butyl acetate, isopropyl acetate, and methyl propionate) was experimentally determined using a laser dynamic solubility-monitoring device in a temperature range of 283.15 to 323.15 K at atmospheric pressure. The functions of solubility versus temperature were regressed using three semi-empirical models (modified Apelblat, three-parameter van’t Hoff, and λh) and two activity coefficient models (Wilson and NRTL). The results show that all the five models can be used to correlate the solubility of clotrimazole with temperature in these solvents satisfactorily. Furthermore, the thermodynamic mixing properties (ΔmixG, ΔmixH, ΔmixS, ln(γ1∞), and H1E, ∞) were evaluated using the measured solubility values and Wilson model parameters.
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高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Ruiyu Fu,Tingze Ren,Yanhui Zhang,Xiaoli Guo,Xin Di
This paper describes a sensitive, simple and green analytical method for pretreatment of sulfonylurea and pyrethroid herbicides in water samples by supramolecular solvent-based liquid phase microextraction (SUPRAS-LPME). The SUPRAS was rapidly formed by nonanoic acid and tetrahydrofuran (THF)/water solution. The attractive features of SUPRAS-LPME include the simplicity, high enrichment factor, low cost and less consumption of organic solvents. The main influencing factors including type and volume of fatty acids, volume of THF , ionic strength, vortex time and volume of formic acid were optimized in detail, and then the significant variables were optimized by Box-Behnken design (BBD). Under the optimized condition, the proposed method shows high precision (RSDs < 13.7 %), low limits of detection (0.5–10 μg L -1 ) and limits of quantitation (10–45 μg L -1 ), acceptable recovery (71.3 %-95.9 %). The proposed method was successfully applied for analysis of sulfonylurea and pyrethroid herbicides in water samples, making it an alternative analytical strategy for determination of trace analytes at the microgram per liter range with desirable sensitivity.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Lu Dong,Shui Wang,Wenchao Ma,Dongxu Wang,Yixin Qu
In this paper, the solubility of levodropropizine, an important cough suppressant drug, in 13 pure solvents (including 8 alcohol solvents and 5 acetate solvents) was studied with the aid of a laser dynamic solubility-monitor device at a temperature from 283.15 to 323.15 K and atmosphere pressure. In the measured temperature range, the solubility of LVDP increases with increasing temperature and follows the following order: iso-butanol > iso-pentanol > n-hexanol ≈ n-heptanol > n-pentanol > n-propanol > n-butanol > iso-propanol > ethyl acetate > n-propyl acetate > n-butyl acetate > n-pentyl acetate > iso-propyl acetate. Three semiempirical models (modified Apelblat, three-parameter van’t-Hoff, and λh) and two activity coefficient models (Wilson and NRTL) were used to correlate solubility of LVDP as a function of temperature and the mixing thermodynamic properties of the 13 solutions were evaluated based on measured solubility and the parameter values of Wilson’s model.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
Mai Han,Mingyi Xu,Yufan Pang,Jingwei Cao,Anle Zhang,Yuxin Wang,Jiajun Wei,Yujian Song,Qingsong Li
Ethyl acrylate (EA) has a wide range of uses, providing convenience for industrial production and daily life. The production process often produces water by-products, so this work selects four commonly used alcohols (1-pentanol, 1-hexanol, 1-heptanol, and 1-octanol) as extractants to explore the liquid–liquid equilibrium (LLE) of water + EA + extractants. Through the analysis of partition coefficient (D), and separation factor (S), it is found that the data of all systems are>1. At the same time, the RMSD% and AAD% calculated by the regression of thermodynamic models (NRTL and UNIQUAC) are both less than 1, indicating that all four alkyl alcohols can separate EA from aqueous solutions well, and 1-octanol has the best effect. Furthermore, the consistency of the LLE data is demonstrated using MATLAB tools.
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高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2022
·Vol. 57
·期 12
·7774-7786
·
IF 3.612
Haiyong Geng,Lihua Chen,Shufen Wang,Yi Wu,Pei Gao,Qixing Jiang,Fang Yang,Wenshui Xia
Summary Although the characterisation of volatile compounds in silver carp ( Hypophthalmichthys molitrix ) have been studied, their respective contribution to specific odour feeling was unclear. Therefore, an investigation was made in this study by big data mining, solid phase microextraction-gas chromatography–mass spectrometry (SPME-GC–MS), odour activity values (OAVs), odour recombination in surimi models and omission experiment. The results demonstrated that 91 volatile compounds were obtained by data mining and 62 volatile compounds were identified by instrumental analysis. Among them, twenty-one volatile compounds were initially selected for the construction of the surimi model. The odour recombination and omission experiment confirmed that characteristic odour of silver carp surimi were hexanal (fishy, grassy), octanal (grassy, fatty), (E)-2-octenal (fishy), nonanal (grassy, fatty), (E)-2-nonanal (fatty, grass), (E,E)-2,4-heptadienal (fishy), 1-hexanol (grassy) and 1-octen-3-ol (mushroom). This study specified distinct silver carp surimi odour with definite compounds.
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
Wenyang Fan,Yuanyuan Han,Houchun Yan,Dongmei Xu,Huiwen Huang,Yinglong Wang
To recover isopropanol from its aqueous solution, alkanols (1-pentanol, 1-hexanol and 1-heptanol) were selected as the solvents to separate water and isopropanol. Liquid-liquid equilibrium data for water + isopropanol + 1-pentanol/1-hexanol/1-heptanol ternary systems were measured at 298.15 K under 101.3 kPa. The mass conservation of the experimental data was checked, and the reliability of the tie-lie data were evaluated by the Bachman, Hand and Othmer-Tobias equations. The extraction performance of the three solvents was assessed through the separation factor and partition coefficient, and compared with those for other reported solvents {esters, ketones, ethers, alkanes (or alkenes), ionic liquids and deep eutectic solvents}, indicating that 1-heptanol has better extraction performance for isopropanol compared with other two solvents. The NRTL and UNIQUAC models were used to correlate the data to obtain regression parameters. The mixed surface analysis based on Gibbs energy topology verified that the binary interaction parameters are consistent with the measured data. Furthermore, the LLE binodal curve for the researched ternary systems were predicted through the UNIFAC and COSMO-UNIFAC models.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Chang Zhou,Qiang Cao,Jia-Liang Wei,Jing-Hui He,Jian-Mei Lu
Soil contaminated by 2,4-dichlorophenol (2,4-DCP) is a substantial environmental concern because it poses severe health hazards. Fenton and Fenton-like oxidation in the removal of 2,4-DCP in soil has attracted considerable attention but suffers from low efficiency due to strong adsorption of pollutants by soil. In this study, the non-toxic catalyst (DFNS-Fe 2 O 3 ) was prepared by loading Fe 2 O 3 on dendritic fibrous nanosilica (DFNS) for degradation of 2,4-DCP in soil. DFNS-Fe 2 O 3 could rapidly remove 2,4-DCP within 120 min (98 %), and the removal rate maintained 70 % after 3 cycles of durability test. In addition, BPA, phenol and 2-CP could be efficiently degraded by DFNS-Fe 2 O 3 . •OH and •O 2 were the main reactive oxygen species (ROS) in the reaction. It is speculated that 2,4-DCP degrades through hydroxylation, substitution process according to the GC-MS results. The toxicity of 2,4-DCP and intermediate products were observed by Ecological Structure Activity Relationships Predictive Model program (ECOSAR). This work paves an avenue for rational design of heterogeneous catalyst on DFNS and their applications in chlorophenol contaminated soil.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 17
·8122-8130
·
IF 3.925
Fangfang Chang,Yongpeng Liu,Lin Yang,Qing Zhang,Juncai Wei,Xiaolei Wang,Zhengyu Bai
The ability to improve the intrinsic activity of nanoalloy electrocatalysts is essential for designing highly efficient electrocatalysts by optimizing the basic physical properties of the nanoalloy. This report describes that the electrocatalytic performance of ultrathin PtnCo100−n alloy nanowires (PtnCo100−n NWs) toward the oxygen reduction reaction (ORR) is enhanced by regulating the lattice strain, highly active facets, and the electronic structure of the alloy, which can be achieved by optimizing the ratio of platinum-to-cobalt in alloys. The catalyst of PtnCo100−n nanoalloy NWs features subtle lattice strain and (111) facets. The electrochemical results show excellent activity and durability toward ORR at a Pt : Co ratio of ∼70 : 30, which suggests compressively-strained single-phase alloy state revealed by X-ray diffraction (XRD) results. The correlation of facets, lattice strain, electronic structure, and activity is evaluated by the theoretical model based on the density functional theory (DFT) calculations of nanoalloy clusters, which show electron transfer from the PtCo alloy to oxygen. There is a relatively low energy difference between the HOMO of the PtCo nanoalloy and the LUMO of oxygen as the Pt : Co atom ratio is 70 : 30. By analyzing the adsorption of OH, O, and OOH intermediates on the surface of PtCo(111) facets of different compositions, it is observed that the adsorption energy of the Pt2Co8 cluster (Pt : Co20 : 80) is the strongest, resulting in low activity. Interestingly, the adsorption energy of the Pt7Co3 cluster is between that of the Pt6Co4 and Pt10 cluster, which is thought to be related to the highest catalytic activity of the nanoalloy when the Pt : Co atom ratio is ∼70 : 30. This finding will provide a new strategy for studying the relationship between the structure and the catalytic activity of nanocatalysts.
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JOURNAL OF BIOMATERIALS APPLICATIONS
·
2022
·
IF 2.712
Zao Cheng,Junfei Gao,Qianqian Liu,Qun Gu
This work describes the relationship between the antibacterial activity and the ester chain length (C1-C8) of (R)-3-Hydroxybutyric ((R)-3-HB) alkyl esters that synthesized from (R)-3-HB acid ((R)-3-HBA) by esterification reaction. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) decrease as the length of the (R)-3-HB alkyl ester chain increases from 1 to 6, but (R)-3-HB-C7 and (R)-3-HB-C8 have their own rules for different microorganisms. Among them, the (R)-3HB-C6 has the relatively best antibacterial and antifungal properties, which MIC were 1.95 mg mL−1 against E. coli and S. aureus; 0.98 mg mL−1 against C. albicans and B. subtilis; 0.49 mg mL−1 against A. niger. Finally, the antimicrobial mechanisms of the (R)-3HB-C6 are revealed, and these include disruption of biofilm and the bacterial wall/membrane, leakage of the intracellular content, and change in the transmembrane potential. These results imply the potential application of (R)-3-HB alkyl ester as new antimicrobial agents; future research can use this as an antibacterial element to synthesize new polymer materials or agents with high-efficiency antibacterial activity.
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高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Ruiyu Fu,Tingze Ren,Yanhui Zhang,Qingxin Lu,Xiaoli Guo,Xin Di
A new supramolecular solvent (SUPRAS) was synthesized using hexafluoroisopropanol (HFIP) as hydrogen bond donor and undecanol as hydrogen bond acceptor. Then SUPRAS was used as extraction solvent to enrich triazole fungicides in drinking water and beverages by liquid phase microextraction (LPME). Additionally, several variables that influence extraction efficiency were optimized, and the significant factors were investigated by Box-Behnken design. At optimum condition, the method shows desirable precision (RSDs less than 19.4%) and acceptable recovery (63.4%-112.1%). The low limits of detection and limits of quantitation of this method were found to be in the range of 1.0–5.0 μg/L and 5.0–20 μg/L, respectively. Compared with other analytical techniques, the method demonstrated comparable sensitivity, consumed less extractant (750 μL) and a shorter pre-treatment time (10 min). The formation mechanism of SUPRAS was investigated by density functional theory. The proposed methodology was green, sensitive, time-saving and successfully applied to determine triazole fungicides in drinking water and beverages, making it an alternative technique for the analysis of trace analytes with satisfactory sensitivity.
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