CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2016
·Vol. 29
·期 5
·617-622
·
IF 0.496
Tang Wen-wu,Zhang Xing-hua,Zhang Qi,Wang Tie-jun,Ma Long-long
Ni-based catalysts supported on different supports ( α -Al 2 O 3 , γ -Al 2 O 3 , SiO 2 , TiO 2 , and ZrO 2 ) were prepared by impregnation. Effects of supports on catalytic performance were tested using hydrodeoxygenation reaction (HDO) of anisole as model reaction. Ni/ α -Al 2 O 3 was found to be the highest active catalyst for HDO of anisole. Under the optimal conditions, the anisole conversion is 93.25% and the hydrocarbon yield is 90.47%. Catalyst characterization using H 2 -TPD method demonstrates that Ni/ α -Al 2 O 3 catalyst possesses more amount of active metal Ni than those of other investigated catalysts, which can enhance the catalytic activity for hydrogenation. Furthermore, it is found that the Ni/ α -Al 2 O 3 catalyst has excellent repeatability, and the carbon deposited on the surface of catalyst is negligible.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Chunli Li,Xuefei Wang,Hao Li,Cong Duan,Le An,Qing Liu
Experimental liquid–liquid equilibrium (LLE) data for the system ethylene glycol (EG) + 1,2-butanediol (1,2-BD) + 3-heptanone were measured at atmospheric pressure at 293.15, 303.15, and 313.15 K and the ternary LLE for systems of EG + 1,2-BD + anisole were also investigated at 303.15 K at 101.3 KPa by using liquid–liquid equilibrium kettle method. Distribution coefficient and selectivity were obtained and applied to evaluate the extraction capacity of 3-heptanone and anisole. The reliability of the experimental data was confirmed by the Hand correlation and the Othmer–Tobias correlation. The experimental LLE data were correlated by NRTL and UNIQUAC models, and the corresponding parameters were obtained. The root-mean-square deviations (RMSD) between the experimental data and calculated values were less than 1.22%. Topological concepts related to the Gibbs stability test were used to validate the consistency between model parameters and experimental data. The liquid–liquid equilibrium data provide the basic physicochemical properties for design of extraction process of 1,2-BD from EG by 3-heptanone and anisole. According to comprehensive correlation coefficient analysis, 3-heptanone is more suitable for the extraction of 1,2-BD from EG than anisole.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Toxics
·
2024
·Vol. 12
·期 1
·54
·
IF 3.9
Peiduan Shi,Xin Yue,Xiaolei Teng,Ruijuan Qu,Ahmed Rady,Saleh Maodaa,Ahmed A. Allam,Zunyao Wang,Zongli Huo
Butylated hydroxyanisole (BHA), a synthetic phenolic antioxidant (SPA), is now widely present in natural waters. To improve the degradation efficiency of BHA and reduce product toxicity, a combination of peroxymonosulfate (PMS) and Ferrate(VI) (Fe(VI)) was used in this study. We systematically investigated the reaction kinetics, mechanism and product toxicity in the degradation of BHA through the combined use of PMS and Fe(VI). The results showed that PMS and Fe(VI) have synergistic effects on the degradation of BHA. The effects of operational factors, including PMS dosage, pH and coexisting ions (Cl−, SO42−, HCO3−, K+, NH4+and Mg2+), and different water matrices were investigated through a series of kinetic experiments. When T = 25 °C, the initial pH was 8.0, the initial BHA concentration was 100 μM, the initial concentration ratio of [PMS]0:[Fe(VI)]0:[BHA]0was 100:1:1 and the degradation rate could reach 92.4% within 30 min. Through liquid chromatography time-of-flight mass spectrometry (LC-TOF-MS) identification, it was determined that the oxidation pathway of BHA caused by PMS/Fe(VI) mainly includes hydroxylation, ring-opening and coupling reactions. Density functional theory (DFT) calculations indicated that•OH was most likely to attack BHA and generate hydroxylated products. The comprehensive comparison of product toxicity results showed that the PMS/Fe(VI) system can effectively reduce the environmental risk of a reaction. This study contributes to the development of PMS/Fe(VI) for water treatment applications.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chengyi Zhu,Jianxiong Liu,Xiaohua Yu,Yingjie Zhang,Xiaodong Jiang,Peng Dong,Yannan Zhang
4-Bromoanisole (4BA) is recommended for LiNi0.6Co0.2Mn0.2O2 (NCM 622) cathode materials as a safety electrolyte additive. The effect of anti-overcharge on NCM 622 cathodes are analyzed by cyclic voltammetry, constant current charge and discharge, AC impedance and scanning electron microscopy (SEM) measurement. The overcharge test results show that 4BA can be effectively electropolymerized at 4.45 V (vs. Li/Li + ), which can consume the overcharge current and protect the working electrode from voltage runaway. The time for the voltage rising to the overcharge state is availably delayed from about 16 hours to about 37 hours. The strategy can block off further oxidation of the active material and electrolyte, and finally promote the overcharge tolerance of the Li-ion batteries. Moreover, it is also found that the use of 4BA as a safety electrolyte additive does not obviously effect the electrochemical performance of NCM 622 and can effectively improve its cycle stability at high cut-off voltage (4.7 V).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2015
·
IF 3.391
Di Wu,Jin Yan,Peixiao Tang,Shanshan Li,Kailin Xu,Hui Li
Considering the harmful impact of food antioxidants on human bodies, thoroughly exposing their potential effects at the molecular level is important. In this study, the binding interactions of butylated hydroxyanisole (BHA), a phenolic antioxidant, and its different major metabolites tert -butylhydroquinone (TBHQ) and tert -butylbenzoquinone (TBQ) with lysozyme were examined via fluorescence, three-dimensional fluorescence, circular dichroism (CD), and ligand–protein docking studies. The three compounds caused strong quenching of lysozyme fluorescence by a static quenching mechanism but with different quenching efficiencies and different effects on the α-helix content of the lysozyme. The order of binding affinity of lysozyme for all test compounds is as follows: BHA > TBQ > TBHQ. Thermodynamic parameters indicated that hydrogen bonding and van der Waals forces perform dominant functions in the binding between these compounds and lysozyme. Furthermore, structure–affinity relationships between the model compounds and lysozyme were established on the basis of computational analyses.
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2016
·Vol. 63
·期 7
·572-579
·
IF 0.879
Juanjuan Hu,Gang Hu,Jimei Song,Zhaohui Fang,Xiaofeng Shen,Lin Hu
A novel analytical approach for quantitative measurement of butylated hydroxyanisole (BHA) is dis- cussed in this paper. Such a method depends on the inhibitory effect of BHA on a Briggs-Rauscher (B-R) oscillating reaction. Unlike the classical B-R system which involves Mn 2+ as the catalyst, such a B-R sys- tem is catalyzed by a macrocyclic nickel (II) complex [NiL](ClO 4 ) 2 , where L in the complex is an unsatu- rated ligand 5,7,7,12,14,14-hexemethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. By perturbation of BHA on the system, the oscillation was inhibited in the presence trace amounts of BHA and the inhibition time was found to be proportional to the concentration of BHA over the range 1.00×10 −7 –1.20×10 −4 mol/L. Two calibration curves were obtained: the first linear regression is over the range of 1.00×10 −7 –2.00×10 −6 mol/L, and the second linear regression is over the range between 2.00×10 −6 and 1.20×10 −4 mol/L, with a lowest limit of detection of 4.00×10 −8 mol/L. UV spectra measurements were employed to clarify the possible perturbation mechanism caused by BHA on the B-R oscillating reaction.
研究领域:
分析化学
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化学动力学
✓ 已验证
DOI
高影响因子
CHEMISTRY & BIODIVERSITY
·
2024
·
IF 2.3
Chuwen Liu,Wengui Duan,Xianli Ma,Guishan Lin,Baoyu Li,Huan Deng
In order to develop new antifungal molecules and explore further applications of natural products, 25 novel amide-urea compounds were synthesized from anethole in this work by a few simple reactions, and structural confirmation was conducted using 1 H-nuclear magnetic resonance ( 1 H-NMR), 13 C-NMR, high-resolution mass spectrometry, and Fourier transform infrared spectroscopy. Preliminary bioactivity tests were performed against eight plant pathogens. The results demonstrated that all compounds exhibited antifungal activity against the tested fungi, and 5p exhibited the most potent antifungal activity. To explore the action mechanism of the antifungal compounds, the inhibitory activity of 5p against succinate dehydrogenase (SDH) was evaluated and found to be comparable to that of boscalid. Furthermore, the binding mode of the compound to SDH was simulated by molecular docking, and similarities between 5p and boscalid's binding with SDH were identified. The results indicate that further investigation of compound 5p may prove beneficial in determining its potential as a fungicide. Graphical Entry for the Graphical Illustration.
研究领域:
植物化学
·
分子生物学
·
农药科学
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产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Pengyu Zhao,Zhiguang Li,Yue Zhang,Debao Cui,Qingchun Guo,Zhipeng Dong,Guodong Qi,Jun Xu,Feng Deng
One-step direct hydroxylation of aromatics is an atom-economic way for phenols production. Ti-containing MFI zeolite is considered to be one of the most potential catalysts for hydroxylation of aromatics to phenols under mild condition with aqueous H 2 O 2 as the oxidant. However, the products are often a mixture of mono- or multi-phenols. Designing TS-1 zeolite catalyst with high yield and selectivity to the target phenols remains a challenging task. Here TS-1 zeolites are prepared by direct hydrothermal and post-synthetic methods. Multiple spectroscopic characterizations show that the crystallinity and Ti-Lewis acid sites (Ti-LASs) distribution of TS-1 zeolite can be controlled by the synthetic approach. The structure-activity relationship of TS-1 zeolite is established in the catalytic hydroxylation of anisole, revealing that Ti-LASs concentration determines the conversion of anisole, while both the crystallinity and Ti-LASs distribution significantly influence the selectivity to the desired product para -hydroxyanisole.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Na Ji,Alazar Alemayehu,Hanyang Li,Poknam Ri,Xinyong Diao
The production of phenol from lignin or its model compounds, instead of cumene oxidation is very interesting from the viewpoint of sustainability and economics. The selective demethylation of anisole was an efficient but challenging route to produce phenol. In this work, we demonstrated the fabrication of nickel sulfide (Ni 9 S 8 +Ni x S 6 ) nanoparticles on Al 2 O 3 matrix by a facile in situ sulfidation of NiAl hydrotalcite and announced that nickel sulfide can serve as efficient active site for the demethylation of anisole for the first time. The as-designed 4Ni1Al-S catalyst exhibited a hierarchical morphology with a high particle density and high dispersion, affording a 95.6% yield of phenol in the demethylation of anisole under relative milder reaction temperature (270 °C) when compared to the reported state-of-the-art results. By comprehensive characterizations and experiments, we inferred that the nickel sulfide exsolved from the LDH structure exhibited stronger metal-support interaction than that obtained from the impregnation method, which not only benefits the uniform dispersion of active nickel sulfide but also results in the electronic transfer from Ni center to Al 2 O 3 support. As a consequence, enhanced demethylation activity was achieved on 4Ni1Al-S in comparison to Ni-S/Al 2 O 3 -IM.
研究领域:
催化
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化学工程
·
材料科学
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2013
·
IF 3.498
Jian-Yao Wang,Hai-Long Wu,Yao Chen,Min Zhai,Xiang-Dong Qing,Ru-Qin Yu
This work presents a novel approach for simultaneous determination of butylated hydroxyanisole (BHA) and propyl gallate (PG) in a very interfering environment by combining the sensitivity of molecular fluorescence and the selectivity of the second-order calibration method . The excitation–emission fluorescence matrix data are processed by applying the second-order calibration method based on the self-weighted alternating normalized residue fitting (SWANRF) algorithm. The limits of detection (LOD) were 1.2–1.3 ng/ml for BHA and 2.2–2.9 ng/ml for PG. The recoveries from spiked cosmetics samples are in the ranges 95.7–103.9% for BHA and 95.9–105.7% for PG. The proposed method avoids preconcentration and elution procedures, so it considerably decreases the analytical time and the experimental expenses. Because the instrument involved in the measurement is nonsophisticated, the experiments could be carried out in routine laboratories. Then it is compared with the HPLC method in dosage of cosmetics and organic reagents, runtime, cost per analysis and LOD.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Limei Fan,Xianwen Kan
It’s significant to determine butylated hydroxyanisole (BHA) in food or other products to ensure human health since BHA has been found to cause a loss of nourishment and even produce toxic effects. The development of the high-quality electrode materials with low cost, high surface area, and good conductivity is of great interest in the field of electrochemical sensing. Herein, a free-standing exfoliated graphite paper (EGP) was employed as a substrate electrode material for the electrochemical determination of BHA. With the successive modification of gold nanoparticles (AuNPs) and NiO nanoparticles, the constructed electrochemical sensor showed wrinkled multi-layers structure with uniform distribution of the nanoparticles. The great specific surface area of EGP not only was suitable for the load of more nanoparticles but also offered abundant pathways for fast electron diffusion. Based on the advantages of high surface area of EGP, the good conductivity of both EGP and AuNPs, and the electrocatalytic activity of NiO nanoparticles, the prepared electrochemical sensor exhibited good detected ability to BHA. Under the optimal conditions, the sensor showed a wide linear range of 3.0 × 10 −8 mol/L–5.0 × 10 −5 mol/L with a low limit of detection of 2.0 × 10 −8 mol/L (S/N = 3) for the determination of BHA. Moreover, this disposable sensor can be used for the sensitive determination of BHA in edible oil samples. It’s obvious that the versatile EGP with the merits of low cost, easy modification, great surface area, and good conductivity, is one of the best candidates of the substrate electrode materials for the construction of other electrochemical sensors.
研究领域:
分析化学
·
食品科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Xia Jiaojiao,Liu Feng,Yan Lishi,Suo Hongbo,Qian Jingya,Zou Bin
In this study, a Zinc porphyrin based covalent organic framework (COF-366-Zn) was synthesized by imine condensation reaction . And the multi-walled carbon nanotubes(MWCNTs) were interspersed on COF-366-Zn to enhance the electron transfer between the material and the electrode surface. The composite material was used to design a COF-366-Zn/MWCNTs/Nafion/GCE sensor. The sensor performance for simultaneous electrochemical detection of antioxidants was investigated. It was found that the COF-366-Zn/MWCNTs/Nafion/GCE sensor could simultaneously detect tert-butylhydroquinone (TBHQ), butylated hydroxyanisole (BHA) and phenol in actual samples with good detection performance. At the same time, the mutual interference between the three analytes was studied. The detection limits are 0.025 μM, 0.056 μM and 0.051 μM, respectively. In addition, the sensor also exhibits excellent anti-interference performance and storage performance.
研究领域:
分析化学
·
材料科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）