INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
·
IF 4.326
Yingying Li,Xueli Ma,Wei Lv,Hong Chen,Linhao Yu,Zewei Ma,Sen Wang,Yongdan Li
Cr-doped ZnAl mixed oxide catalysts (Zn0.75CrAl-x-c) were obtained via calcining the Zn0.75CrAl-x hydrotalcite precursors and were applied in the selective oxidation of 5-hydroxymethylfurfural (5-HMF) to 2,5-furandicarboxylic acid (FDCA). Cr doping significantly enhanced the catalytic activity. A 95.1% 5-HMF conversion with an 88.1% FDCA selectivity was achieved over the Zn0.75CrAl-6-c catalyst at 130 °C under 0.6 MPa oxygen for 4 h. The good performance was associated with the high specific surface area and high oxygen vacancy concentration. Moreover, the Zn0.75CrAl-6-c catalyst was used for five cycles without a significant activity loss indicating excellent stability.
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Reaction Chemistry & Engineering
·
2022
·Vol. 7
·期 8
·1742-1749
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IF 5.2
Chaoqiang Wu,Chengyong Wang,Alei Zhang,Kequan Chen,Fei Cao,Pingkai Ouyang
3-Acetamido-5-acetylfuran (3A5AF) is an important platform compound, possessing very promising application prospects. Herein, we propose a new approach to convert N-acetylglucosamine (NAG) and chitin to 3A5AF using biobased deep eutectic solvents (DESs) containing choline chloride and various organic acids or polyols. A comparison of catalytic capacity showed that a DES made with choline chloride/citric acid (CCCA) possesses the optimum catalytic properties, which lead to a maximum yield for 3A5AF of 47.1 mol% and 5.0 mol% from NAG and chitin, respectively, at 210 °C in N,N-dimethylacetamide solvent with CaCl2·2H2O as an additive. Moreover, CCCA showed excellent recyclability and retained over 63.6% of its original activity after five cycles of use. In addition, the 3A5AF product was obtained with 99.0% purity by simple extraction and crystallization. This research provided a new avenue for 3A5AF production from renewable chitin resources.
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Frontiers in Materials
·
2022
·
IF 3.985
Guo Xin,Wang Jinke,Huang Luyao,Wang Yajie,Ma Li,Zhang Dawei,Ma Lingwei
The corrosion inhibition effect of 3-amino-5-mercapto-1,2,4-triazole (AMT) on AA2024 aluminium alloy in 3.5 wt.% NaCl solution was investigated, and the corrosion inhibition mechanism was revealed. The influence of AMT concentration on the corrosion inhibition performance was evaluated by potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS). Surface analysis and surface-enhanced Raman scattering (SERS) spectra were used to study the adsorption process and corrosion inhibition mechanism of AMT on the alloy surface. Polarization curve and EIS results showed that when the AMT concentration was 1.5 g/L, the corrosion current density (icorr) was the lowest and the resistance of adsorption film (Rf) was the largest, illustrating the highest corrosion inhibition efficiency. Moreover, the adsorption kinetics process of AMT was revealed by SERS measurement, and a positive correlation between the SERS intensity and Rf values of AMT after different immersion time was achieved. It indicated that the efficient adsorption of corrosion inhibitors significantly enhanced the corrosion inhibition performance. Density functional theory (DFT) and molecular dynamics simulations were used to give further insight into the adsorption and inhibition mechanism of AMT on the aluminium alloy surface.
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TALANTA
·
2022
·
IF 6.556
Jin Wang,Lin Zhou,Jiali Bei,Qiyuan Zhao,Xue Li,Jiaqi He,Yan Cai,Tingting Chen,Yukou Du,Yong Yao
Pillar [5]arene, a new water-soluble carboxylatopillar [5]arene ammonium salts (WP5), has been employed as the host for complexation of guest molecules. Herein, a visible light driven WP5 functionalized gold nanoparticles (Au@WP5) was fabricated for ultrasensitive photelectrochemical (PEC) detection of caffeic acid (CA). The ultraviolet–visible spectrum characteristics, PEC response results of samples in caffeic acid solution confirm the localized surface plasmon resonance effect of Au NPs and the host-guest interaction between WP5 and CA are responsible for the enhanced PEC sensing performance. Under optimal conditions, the sensitive PEC sensor constructed with Au@WP5 exhibited the concentration linear range from 0.025 μM to 370 μM and a detection limit of 0.01 μM (S/N = 3). Importantly, the good anti-interference ability, stability and reproducibility of the proposed PEC sensor providing the promising detection application of pillar [5]arene functionalized photoactive materials in food and drinks.
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PubMed
高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Xinyi Xing,Ying Guan,Liping Zhang,Xian Shi,Han Wu,Hui Gao,Siquan Xu
A catalytic system that is both efficient and recyclable is desirable for production 5-hydroxymethylfurfural (HMF) from glucose. In this study, the catalytic system composed of H 2 O (NaCl) -tetrahydrofuran (THF) biphasic system and H-β zeolite was found to have excellent performance for the glucose conversion into HMF. The physicochemical properties of the H-β zeolite catalyst, the dosage of the system components, and the reaction parameters were investigated in detail to optimize the production efficiency of HMF. Under optimal reaction conditions, an advanced level of 84% HMF yield was obtained from glucose. After the reaction was completed, all components of the catalytic system can be recovered, realizing no waste of reagents. Moreover, the recycled H-β(30) zeolite catalyst maintained considerable catalytic stability after five consecutive cycles. Therefore, it is reasonable to believe that the efficient, inexpensive, and recyclable H 2 O (NaCl) -THF catalytic system containing H-β(30) zeolite is capable of showing promising application potential in the future.
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SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Juan Du,Zhaolin Wang,Ziming Wei,Jiawei Yao,Haipeng Song
This paper investigated the preparation of new environmental, pH stimulation response nanocontainer enhanced, self-healing, and efficient anti-corrosion coating for aluminum alloy protection. Silane/Ce-ZSM-5 coating with improved morphology was successfully synthesized on aluminum alloy surface, through the new proposed “hydrothermal crystallization - ion exchange - self-assembled seed growth - hot pressing” technology, in which ZSM-5 molecular sieve was served as pH stimulation response nanocontainer. The corrosion resistance and self-healing ability of the coating in 3.5 wt% NaCl solution were further investigated by the combined analysis of SEM, EIS, LEIS , ICP-MS characterization and 3D microscopic observation. The experimental results showed that the prepared silane-Ce-ZSM-5 coatings exhibited excellent corrosion protection and self-healing ability, which was attributed to the pH stimulation release of corrosion inhibitor Ce 3+ when the coatings were damaged. The ZSM-5 zeolites generated Ce(OH) 3 or CeO 2 precipitates to gradually fill the aluminum alloy defects, thus forming a dense protective layer and inhibiting the corrosion activity.
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高影响因子
FUEL
·
2022
·
IF 8.035
Shuai Wang,Thomas L. Eberhardt,Hui Pan
A lignin-derived mesoporous carbon solid acid catalyst (LDMCC) was prepared using alkali lignin as a carbon source and KCl as a salt template to generate a carbon support that was carboxylated with acrylic acid. The prepared LDMCCs were characterized by various spectroscopies (FTIR, XPS, XRD, Raman), porosity determinations (BET), microscopies (SEM, TEM), thermogravimetric analysis, and acid-base titration. The LDMCC produced at the highest carbonization temperature (900 °C) possesses a rich porous structure, high specific surface area (1197.1 m 2 ·g −1 ), large pore volume (0.63 cm 3 ·g −1 ), and abundant –COOH groups (2.4 mmol·g −1 ). This weakly acidic catalyst exhibits excellent synergistic catalytic performance with DMSO in the catalytic dehydration of fructose to prepare 5-hydroxymethylfurfural (5-HMF); the yield of 5-HMF was 96.0% using dimethyl sulfoxide as the solvent, reaction conditions of 180 °C for 2.0 h, and a catalyst loading of 0.1 mg·mg −1 . In addition, the prepared LDMCC exhibits excellent reusability over five cycles of use without significant loss in its catalytic activity. This study provides a novel green route for the preparation of a weakly acidic catalyst which may be useful for a variety of biomass conversion processes.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2022
·
IF 3.269
Guangyuan Chen,Yunhai Shi,Rongchun Shen,Wei Li,Jinghong Zhou
Two kinds of ketones , 5-methyl-2-hexanone and di-isobutyl ketone were selected as the extraction agents for separating the azeotrope of ethylene glycol (EG)and 1,2-butanediol (1,2-BDO). By comparing the results of preliminary extraction experiments under 303.15 K and normal pressure, 5-methyl-2-hexanone was the better one. And the Liquid-liquid equilibrium data of EG + 1,2-BDO + 5-methyl-2-hexanone ternary system were successively measured at 293.15 K and 313.15 K. The distribution coefficient ( K 2 ) and selectivity coefficient ( S ) of 1,2-BDO were calculated from the experimental data. The LLE data were correlated by NRTL and UNIQUAC activity models with the authorized Aspen Plus software. The root mean square deviations ( RD ) between the experimental and calculated values were all less than 0.7%, which means they were consistent with each other very well.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 4
·1960-1971
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IF 3.591
Wen He,Yongbo Xie,Qiang Yin,Zixuan Zhao,Lang Shi,Hongqing Wang
Scientists are still working on developing a “turn-on” fluorescence sensor for Co2+, especially in acidic solutions. A novel “on–off–on” fluorescence sensor based on g-C3N4 nanosheets was designed and prepared in this paper. It was able to detect (2-(5-bromo-2-pyridylazo)-5(diethylamino)phenol (abbreviated to 5-Br-PADAP) and Co2+ quantitatively by quenching and restoring the fluorescence of the g-C3N4 nanosheet system, respectively. Also discussed are the effects of solvent, pH, order of addition, and interaction time of 5-Br-PADAP and Co2+, as well as the concentration range of the object on measurement. Furthermore, in acidic conditions, the sensor demonstrated good selectivity and sensitivity. In the solvent system EtOH : H2O (v/v = 1 : 9, pH = 3), the fluorescence intensity had a good linear relationship with 5-Br-PADAP and Co2+ concentrations in the ranges of 0–15 μM and 0–10 μM, with low detection limits of 64 nM and 44 nM, respectively. Experiments and theoretical calculations were used to describe the interaction characteristics and sensing mechanism. It was eventually successful in detecting Co2+ in environmental samples.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 59
·37063-37066
·
IF 3.361
Zhengyang Fan,Jie Chen,Huaming Mao,Jungang Yin,Wei Dai,Linlin He,Hongwei Yang
Synthesis of silver nanowires (Ag NWs) has been studied for decades. However, Ag NWs with diameters below 20 nm synthesised by simple and robust approaches are still rarely reported. In this work, Ag NWs with an average diameter of ∼15 nm and an aspect ratio of over 1000 have been prepared by using a Grignard reagent 5-chloro-2-thienylmagnesium bromide as an assistant additive. In particular, the presence of 5-chloro-2-thienylmagnesium bromide is proven to be beneficial for the in situ formation of smaller AgBr and AgCl particles step by step in comparison with traditional inorganic halide ions, and then promote the final growth of ultrafine Ag NWs.
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高影响因子
FUEL
·
2021
·
IF 6.609
Jiu Chen,Bin Li,Cheng-Yang Cao,Si-Yuan Zhou,Li-Feng Xie,Dan Zhang
As a novel rich nitrogen content material, 5-Amino-1 H -Tetrazole (5AT) has been considerably popularized in the propellants area recently. The pyrolysis is deemed as the prelude of combustion for solid phase 5AT, which plays a crucial role in combustion process and grasping the pyrolysis characteristics will be more beneficial to further explore the combustion properties of 5AT-based propellant. In this paper, several efforts have been made to enhance the pyrolysis behaviors of 5AT, including employing metal particles as catalysts, and modifying the surface treatment method. Due to the calorific value, the boron and copper powder are selected as the potential catalysts. The solvent/non-solvent (S/NS) and solution recrystallization method are compared to explore the impact of these two modification methods. TG-FTIR technique is applied to capture evolved signals of organic compounds to further deduce the most probable decomposition pathway. Moreover, model-free and model-fitting methods are both employed to calculate the kinetic parameters. The results reveal that, for the modified 5AT samples with the same boron powder catalyst, the activation energies and reaction model (all governed by F4) in the initial stage (100–330 °C) are not significantly impacted by these two modification methods. However, during the latter stages (400–750 °C), the catalytic actions of boron powder appear to be more active, and solution recrystallization method exerts better modification effect, the activation energies was reduced 18.3 kJ/mol and 10.9 kJ/mol respectively for the latter stages compared to S/SN method. Also, the reaction model is transformed from n th -dimensional model (D3) to n th -order model (F1) in the third stage. Particularly, the catalytic actions of copper powder results in the simplification of decomposition steps for 5AT, the activation energies was 138.8 kJ/mol and the catalytic effect of which was improved about 25% compared to the catalytic effect of boron powder in the first stage and its reaction model is also found to be changed into F3. It illustrates that copper powder could embody a better catalytic effect than boron powder under the same modification method. The conclusions of this study could provide a worthwhile guidance for the understanding, designs and applications of the 5AT-based propellants.
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ANALYTICAL CHEMISTRY
·
2026
·
IF 7.3
Yingfang Zhang,Sihai Luo,Sen Jiang,Hao Sun,Hongyi Shen,Lijuan Chen,Qi Yuan,Xiaoliang Chen,Nan Zhang,Fang Mi,Yi Lv,Fenggang Ren,Jinyou Shao
Abstract The confinement of light into nanometer-sized (typically <10 nm) metallic nanogaps can generate extremely high near-field enhancement, dramatically boosting absorption, emission, and Raman scattering of target molecules situated within the gaps. However, the scarcity of cost-effective, reliable, and high-throughput nanofabrication techniques capable of fabricating sub-10 nm gaps, particularly in binary nanostructures, has significantly hindered their practical applications. Here, a high-throughput nanofabrication strategy that combines anodic aluminum oxide (AAO) templates, molecular self-assembly, and glancing-angle ion-beam etching (IBE) is proposed to controllably produce large-scale bimetallic gold–silver (Au–Ag) arrays with approximately 5 nm gaps. These arrays serve as exceptional surface-enhanced Raman spectroscopy (SERS) substrates, allowing for the ultrasensitive detection of target molecules with limits of detection (LODs) as low as 10–11 M for rhodamine 6G (R6G) and 4-mercaptobenzoic acid (4-MBA) and 10–8 M for bilirubin. The bimetallic Au–Ag nanogap arrays leverage the synergistic effects of gold’s strong absorption and silver’s superior plasmonic properties, achieving significantly enhanced electromagnetic fields compared to monolithic Au–Au nanogap arrays. This cost-effective and efficient nanofabrication approach overcomes the limitations of conventional methods for fabricating binary nanostructures, providing a viable solution for developing high-sensitive and reliable SERS-based detection platforms toward chemical-/bio-sensing.
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