JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Jian Chen,Mei Dong,Wenjing Shi,Danni Zhao,Wensheng Li,Haoran Liu,Weiping Luo
In this study, the solubility of isophthalic acid (IPA) and m-toluic acid (m-TA) in eight monobasic alcohols, methanol, ethanol, 1-propanol, iso-propanol, 1-butanol, iso-butanol, tert-butanol, and 2-butanol is measured under 101.3 kPa by the method of laser dynamics. The experimental temperature range is 294.35–360.75 K. The measured data showed that the solubility of IPA and m-toluic acid increased with the increase of temperature in the measured temperature range. At the same temperature, the solubility of m-toluic acid in the same pure solvent is higher than that of IPA. The solubility of IPA and m-toluic acid in eight solvents decreased with the increase of the number of carbon atoms of the solvent. At the same temperature, the solubility ratio of m-toluic acid to IPA in iso-butanol is the highest in the same solvent, and the ratio was greater than 70, making it the best solvent for separating IPA and m-toluic acid. The Apelblat model, the Buchowski–Ksiazczak λh model, and the modified nonrandom two-liquid activity coefficient model were used to correlate the experimental data, and the calculated solubility was in good agreement with the measured result. The calculated solubilities were in good fit with the measured results. The thermodynamic properties were calculated, and the main contributor of the standard molar Gibbs energy of IPA and m-toluic acid in eight alcohols is enthalpy, about 55.40 to 82.86%.
研究领域:
化学工程
·
物理化学
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产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Haoshan Wei,Zhongxin Huang,Jiewu Cui,Pengjie Zhang,Song Ma,Wei Sun,Xiaohui Liang,Yong Zhang,Yucheng Wu
M-type barium ferrites (Ba 1−x Nd x Fe 12−x M x O 19 , x = 0–0.3) with Nd 3+ –M 5+ (M = Nb 5+ and Ta 5+ ) ions substituting Ba 2+ and Fe 3+ ions were prepared via a solid-state reaction. The crystalline phases, microstructure, magnetic properties , and electromagnetic wave absorption of the ion-substituted M-type barium ferrites were investigated. The saturation magnetization strength and coercivity changed with increasing substitution ratio x. The substitution of Nd–Nb and Nd–Ta ions reduced the anisotropic field of the material, thus lowering the natural resonant frequency. The complex permittivity of the ion-substituted samples was enhanced compared with that of the unsubstituted samples. Interfacial polarization, dipole polarization and dipole relaxation were induced by the substituted ions. The multiple natural resonances contributed by the numerous g-factors generated by Fe 3+ ions and the exchange coupling among Fe 3+ , Fe 2+ , and O 2− ions controlled the permeability of M-type barium ferrite, which broadened the effective absorption bandwidth. The excellent complex permittivity and complex permeability enabled the substituted samples to attain high attenuation constants and better impedance-matching properties. Hence, a strong reflection loss of (−35)–(−50) dB, an ultrabroad bandwidth of ∼13.5 GHz, and a low matching thickness of < 0.75 mm were obtained in the frequency range of 26.5–40 GHz. The electromagnetic wave absorption was also improved in the frequency range of 2–18 GHz, where the samples with the substitution ratio of x = 0.1 exhibited relatively good performance with small matching thickness (<1.5 mm). Thereby, Nd–Nb and Nd–Ta substituted M-type barium ferrites are prospective candidates that can be used as an excellent microwave absorber material in the centimeter and millimeter wavelength frequency range.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2025
·
IF 6.3
Xiaoqing Xu,Yuhan Sun,Xiangze Yu,Rui Huang,Renjie Ji,Jiale Xu,Jianxiang Li,Ruifan Zhou,Qiang Zhang,Xiaoyu Yan
Background Compared to propane dehydrogenation (PDH) technology, propane oxidative dehydrogenation (ODHP) technology represents an effective approach to overcoming thermodynamic limitations. Supported boron oxide catalysts demonstrate promising potential by co-producing high-value ethylene while enhancing olefin selectivity. However, the critical challenge impeding the development of boron-based catalysts lies in the evaporation-induced loss of active components (boron oxide) under calcination process. Methods BO x −M ( M = SnO 2 , SiO 2 , MgO, CaO, MgSO 4 , CaSO 4 ) catalysts with 10 wt% boron trioxide loading were prepared by simple co-impregnation method using different supports. Significant findings Compared with other catalysts, the BO x -SnO 2 , BO x -CaSO 4 , and BO x −MgSO 4 systems featuring covalent oxygen-containing supports demonstrated superior catalytic performance, achieving propane conversions of 50.1 %, 49.4 %, and 48.9 %, respectively. Analysis revealed that the covalently bonded oxygen in the support forms covalent bridges with the active BO 3 species, thereby enhancing the stable interactions between the support and active components. This effectively mitigates the loss of active species during calcination and improves the catalytic activity. These findings provide a feasible pathway for developing high-performance catalytic systems for ODHP.
研究领域:
催化化学
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材料科学
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化学工程
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工业催化
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能源化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Dandan Huang,Dezhi Yang,Yang Lv,Jianle Zhou,Liang Li,Jiangping Xu,Xuemei Yang,Zhengzheng Zhou
Cocrystal hydrate accounts for a small percentage of cocrystals of poorly water-soluble drugs, and still lack the explanation on its cause of formation. In this study, a cocrystal hydrate with a novel phosphodiesterase-4 (PDE-4) inhibitor, chlorbipram, is prepared and characterized using multi-techniques. The dissolution behavior, ternary phase diagram and theoretical calculations are further performed and discussed. Chlorbipram: m-Hydroxybenzoic acid (ChBP-MHBA, 1: 1) cocrystal hydrate presents approximate equivalent dissolution (1.61 mg/mL) in comparison with ChBP (1.90 mg/mL) in isopropanol/water (1: 1, v/v) solution. Ternary phase diagram plotted in ethyl acetate solvent suggests that ChBP-MHBA cocrystal hydrate has an optimum mass percentage range from (2.91%: 2.64%: 94.45%) to (3.20%: 10.74%: 86.06%) among ChBP, MHBA and ethyl acetate. There are two lattice waters in each unit cell of ChBP-MHBA cocrystal hydrate, accounting for 4.5% proportion of the cell volume using contact surface calculations. Molecular Electrostatic Potential Surface (MEPS) investigations indicate that the strong hydrogen bonds are formed within the cocrystal lattice, which are between the global minimum values of ChBP/MHBA and the global maximum values of lattice water. In summary, lattice water plays an important role in the formation of cocrystal hydrate, providing hydrogen atom donor and forming hydrogen bonds to support its three-dimensional crystal structure.
研究领域:
药物化学
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晶体学
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药剂学
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产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xi Li,Haiyong Wang,Kingdom Alorku,Jin Wang,Longlong Ma,Ying Xu
Efficient hydrogenolysis of C-O bonds in lignin offers a promising pathway for producing high-value-added biofuels and chemicals. However, designing an easily synthesized, highly active catalyst for this process remains a challenge. In this paper, a series of Ni-M(Pd, Pt, Ru)/C catalysts were prepared and synergized with NaOH to produce aromatic compounds from β-O-4 model compound (MC). Among the catalyst systems, Ni-0.25 % Pd/C-NaOH completely converted β-O-4 MC at mild conditions (150 °C, 2 MPa H 2 , 3 h) to produce monomers with a yield of 95.6 wt% and excellent selectivity of the bond-breaking products as high as 85.5 %. Recycling tests showed that the Ni-0.25 % Pd/C catalyst remained stable after five cycles, with high activity and without the need for a further reduction before runs. Further, the catalytic system has proven to exhibit high activity for the cleavage of other types of lignin MC, such as 4-O-5, α-O-4, β-O-4 and ether bond (diphenyl ether, benzyl phenyl ether, Guaiacolylglycerol-β-guaiacol ether, benzyl ether) and also effective for lignin from enzymatic cleavage (LEC). Hydrogenolysis of LEC achieved a monomer yield of 34.5 wt%; the molecular weight (555 g/mol) of the hydrogenolysis oligomer was significantly reduced compared to LEC (2872 g/mol). The highly active and stable Ni-0.25 % Pd/C-NaOH catalytic system provides a promising pathway for the efficient hydrogenolysis of lignin and lignin model compounds to produce high-value biofuels and chemicals.
研究领域:
化学工程
·
可再生资源利用
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Jiarui Zhao,Zhen Wang,Hao Wang,Yan Li,Changqing Fang
With the rapid development of communication technology, it will lead to many electromagnetic wave (EMW) pollutions affecting the normal operation of precision instruments in industry. Then need smart electromagnetic interference (EMI) shielding material to protect the instrument from electromagnetic radiation . In this paper, multi-dimensional architectures yolk-shell-like VO 2 (M)/Ti 3 C 2 T x MXene (MXene) composite films (VM) were successfully prepared by hydrothermal treatment and electrostatic self-assembly. Yolk-shell-like VO 2 (M) microspheres were riveted onto few-layer MXene nanosheets as a smart EMI shielding material. Above 65 °C, the metal-insulator phase transition (MIT) of VO 2 (M) changes from the semiconductor state to the metallic state. VM composite films possess temperature controlled EMI shielding properties, which have not been reported before. When the thickness is 29.06 µm, the composite sample exhibits an EMI SE of 43.5 dB at 85 °C, which is 8 dB higher than room temperature . Besides, the few-layer structure and the unique yolk-shell-like structure of VM composite films exhibit excellent dielectric loss. The introduction of few-layer MXene nanosheets improves the EMI shielding performance of yolk-shell-like VO 2 (M) microspheres and achieves optimized impedance matching. Therefore, VM composite films are expected to provide new ideas for smart EMI shielding materials.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Mingjing Ma,Huanhuan Yu,Baolin Zhu,Wenjun Zheng,Shoumin Zhang
The design of efficient catalysts with atom clusters (ACs) and single atoms (SAs) as active sites for water splitting presents an effective approach for improving bifunctional electrocatalytic performance by synergistically promoting electron transport and proton transfer kinetics. In this work, a series of Fe2O3-supported noble metal catalysts (M = Ru, Rh, Pd, Ag) incorporating both ACs and SAs sites were developed, with detailed characterization identifying Ru ACs as the primary active centers. The designed-interfacial M-O-Fe bonds play a critical role in charge redistribution, subsequently enhancing electron and proton transfer kinetics. The resulting heterostructure optimizes both the electronic environment and active site accessibility, yielding exceptional electrocatalytic performance. Further density functional theory calculations demonstrate that the incorporation of Ru species leads to increased filling of antibonding orbitals and modulation of the d-band center, subsequently reducing the energy barrier of the rate-determining steps to −0.267 eV for HER and 1.522 eV for OER, respectively. Consequently, the representative Ru/Fe2O3 with Ru content of 1.1 wt.% achieves an OER overpotential of 189 mV and a HER overpotential of 21 mV at a current density of 10 mA cm−2. This study highlights a novel approach to the design of advanced bifunctional electrocatalysts by engineering interfacial bridge bonds.
研究领域:
电化学
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催化
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材料科学
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纳米技术
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理论化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 38
·13396-13404
·
IF 7.059
Liangmiao Zhang,Fang Xia,Jianing Yao,Tianli Zhu,Hui Xia,Guang Yang,Bin Liu,Yanfeng Gao
Monoclinic VO2(M) has been considered as one of the most promising materials for fabricating energy-saving smart windows, but its scalable synthesis is still a great challenge. In this work, pure and tungsten (W)-doped VO2(M) nanoparticles (20–50 nm) were prepared by a simple hydrothermal recrystallization method using an amorphous precursor obtained from coprecipitation in a mixed VOSO4 and NaOH solution (pH = 9). The phase transition temperature of the obtained W-doped VO2(M) nanoparticles decreases with increasing W-doping, by −28.4 °C per at% of W in the range of 0–1.1 at%. The mechanism of hydrothermal recrystallization was studied by using ex situ powder X-ray diffraction (PXRD) and in situ synchrotron radiation-based PXRD. It was found that the hydrothermal synthesis underwent two steps: (1) recrystallization of amorphous precursor to VO2(B) crystals, and (2) allotropic phase transformation from the metastable intermediate VO2(B) to VO2(M). In addition, the fabricated films using VO2(M) with 0.7 at% W-doping showed excellent thermochromic performance, with a suitable phase transition temperature of 42.7 °C, high average luminance transmittance of up to 61.7%, and good solar energy modulation ability of 11.7%, making them a suitable material for efficient and low-cost energy saving smart windows.
研究领域:
材料科学
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纳米技术
·
能源效率
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Peiwei Han,Xiangnan Li,Chengyu Jin,Xiangdong Tan,Wenjing Sun,Shengzhe Wang,Fuchen Ding,Xinjun Li,Haibo Jin,Chenglin Sun,Huangzhao Wei,Lei Ma
Highly efficient and stable catalysts for continuous catalytic ozonation of organic pollutants are of great significance in industrial applications. Perovskites have been seen as promising environmental catalysts because of their tunable defect structures and electronic properties. This work reports on A-site cation stoichiometry deviation as an effective engineering strategy to improve the crystallinity of perovskite CaZrO 3 , as well as its catalytic ozonation activity. High pure phase Ca 1.1 ZrO 3 nanocrystals were successfully synthesized using a co-precipitation calcination method and evaluated as ozonation catalysts for m-cresol degradation. Surprisingly, Ca 1.1 ZrO 3 exhibits a higher total organic carbon (TOC) removal rate, ozone utilization rate, and conversion rate of m-cresol than the stoichiometric of CaZrO 3 and other conventional transition metal catalysts. In addition, Ca 1.1 ZrO 3 shows an almost constant conversion rate of m-cresol (100%) and TOC removal rate (∼82%) during uninterrupted 100-h catalytic ozonation m-cresol degradation, demonstrating its excellent catalytic stability. These outstanding catalytic activity and stability toward ozonation are attributed to the synergistic meliorated oxygen octahedron structure, including Zr cation and contiguous coordinated oxygen, by introducing a non-stoichiometry defect into the perovskite. Thus, Ca 1.1 ZrO 3 presents an advanced oxidation process of reactive oxygen species (·OH, O 2 · - , 1 O 2 ). These results were verified by in situ X-ray diffraction, in situ Fourier transform infrared spectroscopy, electron paramagnetic resonance, and density functional theory. This work strongly believes that Ca 1.1 ZrO 3 can be an efficient, stable, and an economic catalyst for catalytic ozonation.
研究领域:
环境科学
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催化材料
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废水处理
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产品关联
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 17
·3571
·
IF 4.6
Lingmei Li,Sidi Luo,You Wu,Xuefei Feng,Yuxin Ding,Yajuan Zhou
Glycosylation of many proteins has been revealed to be closely related to food allergy, and screening and structural analysis of related glycoproteins are essential for studies in this important area. Gly m Bd 30K is one of the major allergens that exist in soybeans.N-Glycans of the Gly m Bd 30K influenced the immunoreactivity and antigen-presenting efficiency. In this paper, soybean allergen glycoprotein Gly m Bd 30K was used as the research object. It was separated and purified by the combination of isoelectric point and Sepharose CL-6B gel. The glycoprotein was analyzed and identified by SDS-PAGE and MALDI-TOF MS. TheN-glycans of Gly m Bd 30K glycoprotein were released and labeled by a newly developed one-pot method, and qualitatively and quantitatively analyzed by ESI-MSnand HILIC-UV-MS/MS. The results showed that the purity of Gly m Bd 30K glycoprotein was 95%, and the relative molecular mass was 33,923 Da. The Gly m Bd 30K glycoprotein contained a total of six kinds of glycans, including two types: oligo-mannose type (4.3%) and paucimannose type (95.7%). The paucimannose modified with core α-1,3-fucose and β-1,2-xylose accounted for 92.87%. This study provides quality-reliable materials for the follow-up study of glycan sensitization and also provides a theoretical basis for the in-depth study of the specificity and biological function of the antigenic determinant of Gly m Bd 30K glycoprotein.
研究领域:
免疫学
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糖生物学
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食品过敏
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蛋白质化学
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质谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Xinmin Liu,Yanjie Niu,Lingyun Wang,Qingjie Guo
Carbon nanotubes (CNTs) and graphene (Gr) modified carbon cloth (CC) cathode were prepared by in situ polymerization method using polyaniline (PANI) as an adhesive. Different modified electrodes were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), cyclic voltammetry (CV), and thermogravimetric analysis (TGA) techniques. These different cathodes were used in anaerobic fluidized bed microbial fuel cell (AFB-MFC) to treat the synthetic m-cresol wastewater. The results showed that the maximum power densities of AFB-MFC with the Gr-modified cathode (PANI + Pt/C + Gr), the CNT-modified cathode (PANI + Pt/C + CNTs), and the Pt/C cathode (PANI + Pt/C) were 910.40, 445.14, and 127.07 mW/m2, respectively. In addition, the removal efficiency of m-cresol in AFB-MFC with PANI + Pt/C + Gr is 91.76%, while the corresponding values in AFB-MFC with PANI + Pt/C + CNTs and PANI + Pt/C are 91.72 and 89.26%, respectively. Gas chromatography–mass spectrometer (GC–MS) was used to detect metabolites of m-cresol. It was proved that m-cresol was degraded to protocatechol and then to 2-dimethylsuccinic acid. The energy of m-cresol degradation pathway was analyzed by Materials Studio (MS) software, and the control step of m-cresol degradation was determined.
研究领域:
环境科学
·
生物化学
·
材料科学
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Di Wu,Zhiming Zhang,Zhuodong Yu,Liang Zhu
Food to microorganisms (F/M) ratio is one of the most important factors affecting microbial growth and pollutant removal in biological wastewater treatment system. For stability of aerobic granular process, optimal range of F/M ratio and a maneuverable F/M ratio control method via quantitative sludge discharge were investigated in this study. Results showed that stable aerobic granules were achieved with good settleability, high pollutant removal efficiency and microbial diversity when F/M ratio was controlled at 0.4–0.5 gCOD/gSS d. In addition, a maneuverable F/M ratio control method via quantitative sludge discharge was developed to verify the feasibility for optimization of F/M ratio. By this method, aerobic granules cultivated with the F/M ratio of 0.4 ± 0.02 gCOD/gSS d had better pollutant removal performance and stable structure with higher protein-like components in EPS. This study further revealed the importance of F/M ratio in the stability of aerobic granular sludge process.
研究领域:
环境工程学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）