JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 13
·6013-6026
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IF 4.4
Hu Yinghui,Wang Xuwen,Hao Jingwei,Jiang Shouhang,Zhang Jian,Yang Yulin,Lin Kaifeng,Zheng Jian,Shuai Yong
The excellent thermal decomposition efficiency of ammonium perchlorate (AP) is of great importance for obtaining propellant with fast specific impulse. In this study, four CuM x O y catalysts, including M = Fe, Ni, Co, and Zn, were synthesized and then used for catalyzing AP decomposition and hydroxyl-terminated polybutadiene (HTPB)-based solid propellant combustion. The existed synergistic effect in CuM x O y catalysts improved the catalytic activity and the most active CuZnO catalyst decreased the AP high-temperature decomposition temperature (HTD) from 412.5 to 289.4 °C. Kinetic studies indicated that CuM x O y catalysts inhibited the conversion of N 2 O to a fully oxidized product and decreased the activation energy ( E a ) in HTD to concentrate AP decomposition to significantly decrease the heat loss, thereby increasing their decomposition efficiency. When applying the CuM x O y catalysts in the HTPB (hydroxyl-terminated polybutadiene)-based solid propellant, a faster burning rate and stronger optical emission spectrum were obtained. The CuM x O y catalyst is a potential additive for the preparation of outstanding combustion solid propellants. Graphical abstract
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FOOD CONTROL
·
2023
·
IF 6
Xiaoyue Yang,Christophe Blecker,Huan Liu,Dequan Zhang,Zhenyu Wang
To elucidate the regulation of different structures of polyphenolic compounds with m-hydroxy and o-hydroxy groups inhibiting the formation of different heterocyclic amines (HAs), the reactions between classified polyphenols (cover flavonoids , phenolic acids , stilbenes, coumarins, chalcones, and with different hydroxyl groups) and roasted lamb patties were studied, and then validated in model systems in vitro. The results indicated that the chalcone, coumarin, and stilbene compounds were more efficient to inhibit the HAs generation in roasted lamb patties in comparison with the flavonoids, while phenolic acid had the worst effect. Besides, polyphenols inhibit the formation of HAs through a synergistic action of scavenging free radicals and trapping active carbonyls. Polyphenols with m-hydroxyl structures have a stronger inhibition of PhIP 1 , Harman and Norharman by capturing the reaction intermediate carbonyl compounds . Polyphenols with the o-hydroxyl group had a stronger inhibitory effect on MeIQx by scavenging free radicals. It was concluded that the ability of polyphenols to inhibit different HAs can be predicted by their m-hydroxyl and o-hydroxyl groups.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Qiongqiong Luo,Shaoheng Wang,Dehua Cai,Ning Zhang,Dewen Zeng
A ZnSO4 electrolyte solution with impurity salts such as MnSO4 and MgSO4 is often used in zinc hydrometallurgical processes over a wide temperature range. CaSO4·2H2O(s) scaling and fluorine corrosion are two encountered problems in the process. Understanding the CaF2(s) solubility behavior in MSO4 (M = Zn, Mn, Mg) aqueous solutions at various temperatures helps remove Ca2+ and F– ions from the solution. However, CaF2(s) solubility data, especially at temperatures >298 K, have not been published yet. In this work, CaF2(s) solubilities in the CaF2–CaSO4–MSO4–H2O (M = Zn, Mn, Mg) quaternary systems and its subsystems of the CaF2–MSO4–H2O (M = Zn, Mn, Mg) at 348.15 K and the CaF2–CaSO4–MSO4–H2O (M = Zn, Mg) quaternary systems and the CaF2–MgSO4–H2O ternary system at 298.15 K are systematically measured. The results show that the CaF2(s) solubility in the MSO4 (M = Zn, Mn, Mg) aqueous solution of a certain concentration at 348.15 K is considerably higher than that at 298.15 K. At 298.15 and 348.15 K, the salting-in effect of MSO4 (M = Zn, Mn, Mg) on CaF2(s) solubility is enhanced with the order ZnSO4 < MnSO4 < MgSO4. At both temperatures, CaF2(s) solubilities in CaSO4·2H2O(s)- or CaSO4(s)-saturated MSO4 (M = Zn, Mn, Mg) aqueous solutions are generally lower than those in pure MSO4 (M = Zn, Mn, Mg) aqueous solutions. Particularly, the salting-in effect of MgSO4 on CaF2 is so strong that CaF2(s) dissolves completely and is converted to CaSO4·2H2O(s) and MgF2(s) in a concentrated MgSO4 aqueous solution. Hence, this study indicates that high temperatures and high salt concentrations increase the CaF2(s) solubility, making the removal of Ca2+ and F– ions from the system challenging. Further, the existence of impurity salts MnSO4 and MgSO4 makes it more difficult.
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JOURNAL OF MATERIALS RESEARCH
·
2023
·Vol. 38
·期 11
·2943-2957
·
IF 2.7
Sun Xiaoqin,Wang Tianyu,Yun Sining
Aurivillius phases with narrow band gaps have attracted extensive interest in the field of photocatalysis, however, they exhibit poor activity due to the low utilization of photogenerated carriers. Herein, a series of S-scheme C3N4@Bi m+1 Fe m-3 Ti 3 O 3m+3 (m = 4, 5, 6) heterojunctions with two-dimensional structures were synthesized by simple two-step method. Compared with single materials, the composites exhibit excellent photocatalytic tetracycline degradation under visible light, and 91.8% of tetracycline can be degraded accompanied with 81.2% of TOC removal within 120 min over C 3 N 4 @Bi 5 FeTi 3 O 15 . The enhanced photocatalytic performance is due to strong interface interaction, high conductivity, and efficient charge separation ability. The mechanism analysis indicates that the C 3 N 4 @Bi 5 FeTi 3 O 15 heterojunction follows an S-scheme heterojunction mechanism with a strong interfacial internal electric field directed from C 3 N 4 to Bi 5 FeTi 3 O 15 , thus, the photogenerated electrons in Bi 5 FeTi 3 O 15 move toward C 3 N 4 , which retains high oxidation ability of Bi 5 FeTi 3 O 15 and high reduction ability of C 3 N 4 to efficiently produce the reactive species, such as O 2 − · and ·OH.
Graphical Abstract
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xiangchun Yang,Guangling He,Wenjian Dong,Liangmin Yu,Xia Li
Novel multisubstituted dopamine derivatives were synthesized and their ability to protect carbon steel in 1 M HCl was investigated by combining electrochemistry , surface analysis and theoretical calculations. The results showed that 91.53% inhibition could be obtained by adding 0.1 g/L of dopamine derivatives at 298 K. Potentiodynamic polarization tests showed that the addition of the dopamine derivative resulted in a corrosion potential difference of ≤ 31 mV, thus identifying the compound as a hybrid inhibitor. X-ray photoelectron spectroscopy and contact angle indicate the successful formation of a hydrophobic barrier on the carbon steel surface, and scanning electron microscopy and laser confocal microscopy confirm the improvement in surface morphology. The dopamine derivatives fit the Langmuir adsorption model with both physical and chemical adsorption. Density functional theory and molecular dynamics simulations revealed that dopamine derivatives rely on lone pairs of electrons in heteroatoms to adsorb parallel to the metal substrate and protect the carbon steel from corrosive media attack. Thus, dopamine derivatives can contribute to the pickling industry as a green corrosion inhibitor to avoid steel damage and waste.
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Royal Society Open Science
·
2018
·Vol. 5
·期 3
·
IF 2.504
Yi Yang,Huiping Zhang,Ying Yan
Fe2O3-ZSM-5 catalysts (0.6 wt% Fe load) prepared by metal-organic chemical vapour deposition (MOCVD) method were evaluated in the catalytic wet peroxide oxidation (CWPO) of m-cresol in a batch reactor. The catalysts have a good iron dispersion and small iron crystalline size, and exhibit high stability during reaction. In addition, the kinetics of the reaction were studied and the initial oxidation rate equation was given. Catalysts were first characterized by N2 adsorption–desorption isotherms, scanning electronic microscopy, energy-dispersive spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Results show that extra-framework Fe3+ species (presenting in the form of Fe2O3) are successfully loaded on ZSM-5 supports by MOCVD method. Performances of catalysts were tested and effects of different temperature, stirring rate, catalyst amount on hydrogen peroxide, m-cresol, total organic carbon (TOC) conversion and Fe leaching concentration were studied. Results reveal that catalytic activity increased with higher temperature, faster stirring rate and larger catalyst amount. In all circumstances, m-cresol conversion could reach 99% in 0.5–2.5 h, and the highest TOC removal (80.5%) is obtained after 3 h under conditions of 60°C, 400 r.p.m. and catalyst amount of 2.5 g l−1. The iron-leaching concentrations are less than 1.1 mg l−1 under all conditions. The initial oxidation rate equation −rA0=7.2×1011e−81300/RTCA is obtained for m-cresol degradation with Fe2O3-ZSM-5 catalysts.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Sheng Liu,Wanwan Lei,Yan Liu,Qiquan Qiao,Wen-Hua Zhang
Hierarchical nanosheet-based nanotubes are very attractive because their unique structure endows them with large surface areas and exposes massive active sites for functional applications. We herein demonstrate a facile one-pot hydrothermal approach to fabricate the hierarchical nanosheet-based MS2 (M = Re, Mo, W) nanotubes by using Te nanowires as sacrificial templates. The hierarchical nanotubes show tube channels of ∼30 nm and hierarchical channel walls with a tunable thickness of up to ∼50 nm. As exemplified for application in Li-ion and Na-ion batteries, the ReS2 hierarchical nanotubes exhibit excellent specific capacities (1137 mA h g–1 for Li-ion batteries and 375 mA h g–1 for Na-ion batteries at 0.1 A g–1 after 100 cycles), good cycling stabilities, and high rate capabilities, demonstrating their promising applicability in rechargeable batteries. This work may open up new opportunities for further exploration of new types of hierarchical nanostructures for applications, e.g., in catalysis, energy chemistry, and gas adsorption and separation.
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CELLULOSE
·
2015
·Vol. 22
·期 6
·3877-3894
·
IF 3.573
Bai Huiyu,Li Yufei,Wang Wei,Chen Guangliang,Rojas Orlando J.,Dong Weifu,Liu Xiaoya
A novel method for the preparation of composites based on poly(vinyl alcohol) (PVA) and micro- and nano-fibrillated cellulose (M/NFC) is reported. The addition of crosslinking HEMA monomers and a photo-initiator enabled the formation of an interpenetrated polymer network that displayed enhanced interfacial adhesion and dispersion of (M/NFC) in the matrix. Photo-crosslinked PVA/(M/NFC)/polyHEMA composite films produced by casting followed by UV polymerization of HEMA were characterized by using several approaches. These included Fourier transform infrared and UV–Vis spectroscopies, differential scanning calorimetry, X-ray diffractometry, thermogravimetric analysis and dynamic mechanical analysis. The thermo-mechanical and optical properties as well as water absorption and vapor barrier abilities of the developed photo-crosslinked PVA/(M/NFC)/polyHEMA films were measured and the benefit of photo-crosslinking determined. The major degradation peak of photo-crosslinked PVA/(M/NFC)/polyHEMA composites increased substantially compared to that of the PVA/(M/NFC) system (from ~300 to ~350 °C). The water vapor permeability of PVA/(M/NFC)/polyHEMA composite films was reduced with HEMA loading (5.44 × 10 −11 , 5.10 × 10 −11 , 4.12 × 10 −11 , 4.31 × 10 −11 g/m h Pa for 0, 5, 10 and 15 % HEMA, respectively). Overall, a new and facile method for the synthesis of PVA/(M/NFC)-based composite networks interpenetrated with cross-linked poly(HEMA) is demonstrated, offering excellent prospects for packaging applications.
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FLUID PHASE EQUILIBRIA
·
2017
·
IF 2.473
Jun Wang,Jie Ou,Xueni Sun,Chunxiang Huang,Jiarui Sun,Hui Shao,Yixin Leng
Isobaric vapour–liquid equilibrium (VLE) data for binary systems containing o-cresol (OC) + m-cresol (MC), OC + 2, 6-dimethylphenol (DMP), and MC + DMP at 20.0 kPa were measured by using a modified Othmer still. Its reliability was confirmed by measuring the saturated vapour pressure data for the components of MC and DMP. Herington area test was used to confirm the thermodynamic consistency for these binary systems, and the results showed good thermodynamic consistency. The binary VLE experimental data were correlated and predicted by Wilson, NRTL, and UNIFAC models. The results correlated by Wilson and NRTL models agree well with the experimental values. The results predicted by UNIFAC are in accordance with experimental data with rational deviations for systems OC + MC and OC + DMP but show relatively large deviations between the predicted values and experimental data for MC + DMP system. By defining the group =COH in DMP and MC as two different groups, the experimental data were correlated, and new groups with binary interaction parameters were obtained. The results calculated by UNIFAC with new defining groups are in accordance with the experimental data.
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DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 43
·14839-14846
·
IF 4.029
Ruru Ma,Dongdong Xu,Yun Yang,Xin Su,Binghua Lei,Zhihua Yang,Shilie Pan
Two new isostructural rare-earth oxyborates ScMO(BO3) (M = Ca and Cd) with a three-dimensional (3D) cationic framework and parallel arranged [BO3] triangles have been synthesized by the flux method. In the 3D cationic framework, an interesting sandwich-like basic building unit (BBU) is constructed by two ∞1[Ca(1)O4]6− chains and two ∞1[Sc(1)O4]5− chains. ScMO(BO3) melt incongruently, which shows that title compounds can be grown by the flux method. The UV cut-off edges for ScCaO(BO3) and ScCdO(BO3) are 230 and 249 nm, respectively. In addition, the first-principles calculations are performed to gain further insights into the relationship between the microscopic electronic structures and associated optical properties.
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Food Chemistry-X
·
2024
·
IF 6.5
Haotian Xu,Zeyu Wang,Zhenyang Qin,Minwei Zhang,Yanan Qin
This study investigates the variation of physicochemical, flavonoids, and volatiles during sequential fermentation which Metschnikowia pulcherrima and Issatchenkia terricola as sequential co-fermenters and a single fermentation by Saccharomyces cerevisiae in mulberry wine. Sequential fermentation shown that β-glucosidase activity greater and fermentation time declined to 144 h. In addition, 11 flavonoids (apigenin-5-O-glucoside, aromadendrin-7-O-glucoside, kaempferol-3,7-O-diglucoside, and so on) were significantly increased. Significant differences were found between types of metabolic products enriched in flavone and flavonol biosynthesis and anthocyanins biosynthesis, with an enrichment ratio of 46.15 % and 23.08 %, respectively. 16 apple-scented compounds (2-Buten-1-one, (E)-1-(2,6,6-trimethyl-1,3-cyclohexadien-1-yl)-, Butanoic acid, (Z)-3-hexenyl ester, 3-methyl-1-methylethyl-Butanoic acid ester, and so on), 5 rose-scented (e.g. benzyl alcohol, ethyl geranate, hydrocinnamic acid), and 4 balsamic-scented compounds ((−)-myrtenol, benzoic acid 1-methylethyl ester, benzyl alcohol, p-cymen-7-ol) were distinctively present. Interestingly, tryptophan metabolism and indole alkaloid biosynthesis are only enriched in sequential fermentation.
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Yaping Li,Yongqi Yang,Chunmeng Zhong,Dan Xiao,Cuisong Zhou
Sensitive detection of resistance mutation T790 M is of great significance for early diagnosis and prognostic monitoring of non-small-cell lung cancer (NSCLC). In this paper, we showed a highly sensitive detection strategy for T790 M using a three-level characteristic current signal pattern in an α-hemolysin nanopore. A probe was designed that formed a C–T mismatched base pair with wild-type/P and a T–T mismatched with the T790M/P. The T790M/P produced a unique three-level characteristic current signal in the presence of mercury ions(II): first, T790M–Hg2+–P entering the vestibule of α-HL under the transmembrane potential and overhang of probe occupying the β-barrel, then probe unzipping from the T790M/P, T790 M temporally residing inside the nanocavity due to the interaction with Hg(II), and finally T790 M passing through the β-barrel. The blocking current distribution was concentrated with a small relative standard deviation of about 3%, and the signal peaks of T790 M and wild-type can be completely separated with a high separation resolution of more than 2.5, which achieved the highly sensitive detection of T790 M down to 0.001 pM (confidence level P 95%) with a linear range from 0.001 pM to 1 nM in human serum samples. This highly sensitive recognition strategy enables the detection of low abundance T790 M and provides a method for prognostic monitoring in NSCLC patients.
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危险品化学品经营许可证（带存储）