ELECTROANALYSIS
·
2016
·Vol. 28
·期 7
·1489-1494
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IF 2.471
Xia Hao,Na Li,Zhen Xu,Nian Bing Li,Hong Qun Luo
A novel electrochemical strategy for the detection of amantadine (AMD) has been developed based on the competitive host-guest interaction of AMD and methylene blue (MB) with β-cyclodextrin (β-CD). Due to the host-guest interaction, MB molecules can enter into the hydrophobic inner cavity of β-CD, and the MB/β-CD/poly(N-acetylaniline)/glassy carbon electrode displays a remarkable reduction peak due to MB. In the presence of AMD, competitive association to β-CD occurs and the MB molecules are displaced by AMD, resulting in a decrease of reduction peak current of MB. The difference value of the cathodic peak current showed a linear relationship with the AMD concentration.
研究领域:
分析化学
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药物分析
·
生物传感
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DOI
高影响因子
Energy Technology
·
2017
·Vol. 6
·期 1
·153-160
·
IF 2.789
Guixiang Ma,Zhao Wang,Shaolei Xie,Jinhe Sun,Yongzhong Jia,Yan Jing,Guangwei Du
In this study, a series of binary mixtures of stearic acid (SA) and acetanilide (AA) at various mass fractions was prepared. A binary mixture of SA and AA with a ratio of 81.0:19.0 mol % is a eutectic mixture with a melting temperature of (342.45±0.25) K and a melting latent heat of (220.04±10.02) J g −1 . To improve the thermal properties of the SA–AA eutectic mixture to obtain a composite phase-change material (CPCM) with a high thermal conductivity, large heat storage capacity, and good thermal stability and reliability for heat energy storage, expanded graphite (EG) at different mass fractions was added into the SA–AA eutectic mixture. The resulting material exhibited a remarkable energy storage capacity with a latent heat of 176.14 J g −1 . The thermal conductivity of the CPCM was enhanced by 14.5 times compared to that of the SA–AA eutectic mixture. The thermophysical properties of the SA–AA/EG CPCM after 100 accelerated thermal cycles were slightly decreased, which did not influence the heat storage. Thus, the prepared SA–AA/EG CPCM is a promising material for latent heat storage systems.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2020
·
IF 4.089
Hao Wu,Jingkang Wang,Qi Liu,Shuyi Zong,Beiqian Tian,Xin Huang,Ting Wang,Qiuxiang Yin,Hongxun Hao
Effectively manipulating crystal nucleation and growth is an essential issue for controlling the crystal morphology. In this work, the effect of additives on promoting crystal nucleation and growth was investigated from both thermodynamic and kinetic perspectives by using p-methylacetanilide as the model compound. Two additives with amide-terminal and halogen-terminal were selected, and it was found that they can promote the nucleation and crystal growth of p-methylacetanilide. It was found that the existence of 4-bromoacetanilide or 4-chloroacetanilide could decrease the solubility and the interfacial energy of p-methylacetanilide in ethanol, thus leading to an easier nucleation process. Furthermore, by measuring the growth rates of the (1 1 0) and (0 1̅ 1) faces of p-methylacetanilide in the absence and presence of additives, it was found that the raised supersaturation was not the only factor for crystal growth intensification. Molecular simulations revealed that the promotion effect was because the amide-terminal of additives bring the halogen-terminal to the proximity of the p-methylacetanilide surface and disrupt the absorbed ethanol layer, thus eliminating the negative influence of solvent on the surface diffusion of p-methylacetanilide.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Yajun Li,Kui Wu
The solid–liquid phase equilibrium of acetoacetanilide (AAA) in 16 solvents, including 8 alcohols, 4 ketones, 3 esters, and acetonitrile, from 272.25 to 324.15 K under atmospheric pressure was measured by the gravimetric method. The solid–liquid equilibrium curve of AAA indicated an increasing trend with the increase in temperature. The highest solubility value is found in cyclopentanone, and the solvent polarity is a critical factor influencing the solubility behaviors but not the only one. Moreover, the modified Apelblat model, λh model, NRTL model, and Wilson model were used to correlate the measured data. The modified Apelblat model showed the most satisfactory agreement. Furthermore, the dissolution thermodynamic properties (ΔdisS, ΔdisH, and ΔdisG) of AAA in selected solvents were estimated on the basis of thermodynamic relations and the regressed Wilson model. The binary equilibrium data and dissolution properties reported in this work can provide the fundamental thermodynamic data for the synthesis, separation, and further study of AAA in industry as well as the academic arena.
研究领域:
化学工程
·
物理化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Shuibo Wang,Chunzheng Wu,Hongbo Yu,Yuting Chu,Shiwei Wang,Tong Li,Hongfeng Yin
Tailoring the interface between active metals and promoters to improve catalytic performance is a challenging issue for bicomponent catalysts. Herein, we developed a series of silica supported Pt-CoO x hybrid nanocatalysts though in situ oxidation of supported bimetallic PtCo nanoparticles (NPs) with different Pt/Co ratios. Focusing on the hydrogenation of acetophenone to 1-phenylethanol as the model reaction, the obtained Pt-CoO x /SiO 2 catalysts showed superior activity and selectivity compared to Pt/SiO 2 , and the sample with a Co/Pt molar ratio of 1/3 performed the best. Our research showed that the CoO x on Pt not only changed its electronic and geometric properties, but also promoted the adsorption of reactants and the dissociation of H 2 . A further increase of the Co/Pt ratio to 1/1, however, reduced the activity due to blockage of the Pt surface.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Bin Chen,Jun Hu,Zhihao Yu,Lin Zhu,Chunzheng Wu,Hongbo Yu
Improving catalytic hydrogenation by modifying noble metal catalysts with metal-oxide promoters is promising, but precisely controlling the metal–promoter interface to optimize performance is still challenging. In this study, we created Ir-SnO2/SiO2 nanocatalysts with different Ir/Sn ratios using IrSn alloy precursors through careful calcination and reduction treatments. The SnO2-promoted catalysts showed much better conversion and selectivity than the original Ir/SiO2 catalyst toward the hydrogenation of acetophenone to phenylethanol. The Ir-SnO2/SiO2 catalyst with an Ir/Sn molar ratio of 5/1 (i.e., sample Ir5-(SnO2)1/SiO2) performed the best, achieving a 94% conversion rate and 99% selectivity. Our study found that SnO2 promoters could reduce the surface electron density of the Ir nanoparticles (NPs), enhancing the adsorption of reactants; meanwhile, the new Ir-SnO2 interface is more active for the dissociation of hydrogen compared to Ir alone. The optimal Ir5-(SnO2)1/SiO2 catalyst has demonstrated versatility by effectively catalyzing the hydrogenation of C═O bonds in a wide range of compounds, showing significant potential for various industrial applications in fine chemical synthesis and energy conversion.
研究领域:
催化化学
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材料科学
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工业化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Zhengxu Li,Hao Wu,Baifeng Hu,Jin Guo,Yuxiang Liu,Han Yue,Hongkang Zhao,Qunsheng Li
The solubility of 2′,4′-dihydroxyacetophenone (2′,4′-DHAP) in 10 monosolvents (methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, methyl acetate, ethyl acetate, propyl acetate, and benzene) and two binary solvents (ethanol + ethyl acetate and n-propanol + ethyl acetate) was determined using a gravimetric method at 101.3 kPa from 293.15 to 333.15 K. The experimental solubility was demonstrated to increase with the increasing temperature. The solubility of 2′,4′-DHAP is the highest in pure isopropanol, and the two binary solvents present a solubilizing effect on the solute. Furthermore, six thermodynamic models were employed to fit the solid–liquid equilibrium data, and the correlation results manifested that the modified Apelblat model had minimum ARD values of less than 1%. Finally, the KAT-LSER model was employed to analyze the solvent effect at 298.15 K. The results show that the contribution of the four interaction types α, β, π*, and δH account for 15.84%, 15.30%, 18.33%, and 50.53% of the total interaction force, respectively, and the solvent–solvent interaction represented by δH is the dominant factor affecting the solubility of 2′,4′-DHAP.
研究领域:
物理化学
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药物化学
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DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 5
·1518-1528
·
IF 5.721
Jin Zhang,Linjuan Pei,Jie Wang,Pengqi Zhu,Xianmo Gu,Zhanfeng Zheng
Ru/TiO2 catalysts exhibit excellent catalytic performance for selective reduction of 4-nitroacetophenone to 4-aminoacetophenone at normal temperature and atmospheric hydrogen pressure. Moreover, 99.9% selectivity to 4-aminoacetophenone can be obtained over 2.7 wt% Ru/TiO2(anatase) catalyst even in a relatively wide temperature (55–115 °C) and time (1–12 h) range. Its excellent catalytic performance is derived from the activation of H2 on the Ru nanoparticles at atmospheric pressure and the strong interaction of nitro groups with the support surface. Additionally, Ru nanoparticles supported on different crystalline TiO2 phases (anatase and rutile) result in different reaction pathways for 4-nitroacetophenone. Since the Ti–Ti distance on the rutile surface is smaller than that on the anatase surface, the hydroxylamine species adsorbed on the Ti atoms of rutile are more susceptible to the coupling reaction. Therefore, Ru/TiO2(rutile) causes a series of intermediates to accumulate during the conversion process, while Ru/TiO2(anatase) allows the highly selective conversion of 4-nitroacetophenone to 4-aminophenone. In addition, Ru/TiO2(anatase) can achieve chemoselective reduction of nitroaromatics to the corresponding anilines in the presence of –CN, –CHO, and –COOH, especially nitroaromatics containing CC and CC, indicating the excellent applicability.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Xiaojing Yang,Xinju Li,Bao Zhang,Taifeng Liu,Zhenpan Chen
Photocatalytic aerobic oxidation of hydrocarbons to ketones is an attractive route for synthesizing high-value-added chemicals. However, the main challenge of photocatalytic oxidation reactions is their low activity. Herein, hollow Bi2MoO6 microspheres were synthesized by a facile two-step synthesis route combining ethylene glycol solvothermal with postannealing treatment. In the photocatalytic aerobic oxidation of ethylbenzene to the corresponding ketones under visible light irradiation using O2 as an oxidant, the hollow Bi2MoO6 microspheres exhibit a record acetophenone production rate of 1.1 mmol g–1 h–1 with 90% selectivity. The photoactivity of oxygen vacancy-enriched Bi2MoO6 is 61 times higher than that of uncalcined Bi2MoO6, which can be attributed to the effective separation of photogenerated carriers and the abundant catalytic active sites (i.e., oxygen vacancies) on hollow Bi2MoO6 microspheres. This work provides more insights into understanding how to construct highly efficient and active visible-light-responsive photocatalysts for the aerobic oxidation of organic compounds.
研究领域:
材料科学
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催化
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化学工程
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环境科学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Guoyu Li,Kungang Chai,Liqin Zhou,Zhangfa Tong,Hongbing Ji
A novel aromatic-rich cellulose-urethane polymer (ACUP) was easily fabricated by crosslinking cellulose with 4,4’,4’’-triphenylmethane triisocyanate for preferential adsorption of acetophenone (AP) over 1-phenyethanol (PE). The successful synthesis of ACUP was confirmed by the instrumental analyses, e.g., FTIR, TG, XPS, FE-SEM, 13 C CP/MAS NMR and XRD. For single-solute adsorption of AP or PE onto ACUP, the effects of adsorbent dosage, agitation speed, time, solute concentration and temperature were systematically investigated. The overall adsorption process was exothermal and spontaneous in nature, and followed the pseudo-second-order kinetic rate equation and Freundlich isotherm model. Competitive adsorption studies concerning the effects of phenyl content in ACUP adsorbent, pH and ionic strength were also presented, in which ACUP showed much higher affinity for AP over PE. In addition, ACUP was examined as a column packing material for adsorptive separation of the equimolar mixture of AP-PE, showing excellent separation capability. The easily-regenerated and recyclable features of ACUP were demonstrated by adsorption-desorption cycles in both batch and continuous modes. Furthermore, a possible mechanism for the preferential adsorption of AP over PE, which may be associated with π-π and hydrogen bonding interactions was suggested on the basis of experimental and theoretical results.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
Reaction Chemistry & Engineering
·
2022
·Vol. 7
·期 5
·1126-1135
·
IF 5.2
Shanshan Lin,Jianguo Liu,Longlong Ma
The catalytic hydrogenation of organic substrates containing plenty of unsaturated functional groups is an important step in the industrial preparation of fine chemicals and has always been a hot spot in basic catalysis research. For example, phenylethanol obtained by the preferential hydrogenation of the CO group of acetophenone is a valuable intermediate for the production of spices, flavors, and medicines. Furthermore, as the demand for 1-phenylethanol (PhE) continues to increase, the catalytic hydrogenation of acetophenone (AP) is becoming more and more important. At present, relatively few catalytic systems are used in this reaction as the hydrogenation of acetophenone is a complex multi-step reaction. Enantioselective hydrogenation on heterogeneous catalysts is remarkable due to its inherent operational and economic advantages, such as atom economy. It is one of the most ideal methods as the catalyst is easily separated and recycled. However, the traditional synthesis way in batch reactors usually takes a long time with unsatisfactory conversion which is not conducive to industrialization. Heterogeneous non-precious metal catalysts are advantageous for their implementation in flow reactor systems for industrial applications due to their ease of separation, low cost, and environmental friendliness. Herein, we report the first use of non-noble metal Ni-supported graphene-based catalysts for hydrogenation of acetophenone to phenylethanol with high efficiency in a flow reactor made of 316L stainless steel with a length of 200 mm and an inner diameter of 6 mm which can significantly improve mass and heat transfer. The conversion rate under the optimized reaction conditions can reach 99.14% with a satisfactory selectivity of 97.77% (the conversion and selectivity are in mol%). The magnetic catalyst has a compact structure, and the Ni particles coated with carbon on the surface are uniformly distributed. After 48 hours of uninterrupted continuous experiments, the conversion rate of acetophenone still reached 88.44%. The catalyst has good cyclability, and the Ni-based catalyst after the cycle still maintains high catalytic activity without obvious deactivation, and the catalyst structure remains intact and stable.
研究领域:
催化化学
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工业化学
·
材料科学
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产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2022
·
IF 4.966
Ziqi Zhao,Yulong Liu,Youquan Zhang,Mei Yang,Fang Shen,Zongwu Wei,Kungang Chai,Hongbing Ji
Starch-based urethane polymers hold great potential for adsorptive separation of acetophenone (AP) and 1-phenylethanol (PE), which coexist commonly in the petrochemical by-products. Yet, the overall adsorption performance was restricted due to the poor porosity of adsorbent. We herein applied external crosslinking strategy to fabricate hypercrosslinked aromatic-rich starch urethane polymer (HASUP) with large surface area. The structural evolution, including chemical state, porosity and morphology were observed through various characteristic techniques. The adsorption properties of AP and PE onto HASUP were investigated in both single and binary systems. Compared to its non-porous precursor, HASUP exhibited significantly higher overall adsorption capacity while maintaining the AP selectivity with varying compositions . The further static and dynamic adsorption assessments demonstrated that HASUP showed exceptional performance to separate AP and PE. And HASUP also exhibited excellent anti-interference ability and recyclability for selective adsorption of AP over PE. Furthermore, theoretical results indicated that the multiple interactions including hydrophobic, π-π, and hydrogen bonding interactions account for selective adsorption of AP. In combination with high surface area, this synergistic effect enhanced the adsorption strength , affording a high AP uptake for HASUP. This work may provide an insight for designing novel porous starch-based adsorbents with high performance.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）