PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
·
2023
·
IF 1.3
Fu-Hao Zhang,Huan Zhang,Chang-Xing Sun,Peng-Hui Li,Lin Jiang
A series of 1-[2-(4-methyl-2-(methylthio)pyrimidine-5-carboxamido)phenyl]ethyl-substitutedphenyl carbamates (3a–3i) were designed and synthesized, using 4-methyl-2-(methylthio)pyrimidine-5-carboxylic acid, (2-aminophenyl)ethan-1-one, and substituted phenyl isocyanates as starting materials. Their structures were characterized by 1H NMR, 13C NMR, IR and HRMS. The in vitro fungicidal activities against Sclerotinia sclerotiorum were evaluated, and the result showed that some compounds displayed moderate antifungal activity with >60% inhibitory rates, among which 1-[2-(4-methyl-2-(methylthio)pyrimidine-5-carboxamido)phenyl] ethyl-(2- methyl phenyl)carbamate (3a) and 1-[2-(4-methyl-2-(methylthio)pyrimidine-5- carboxamido)phenyl] ethyl-(3-trifluoromethyl phenyl)carbamate (3g) held inhibitory rates of 69.5% and 70.3% at 100 mg/L, respectively. Molecular docking study showed that 3g can form two hydrogen bonds and a cation-π interaction with succinate dehydrogenase.
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CHEMICAL ENGINEERING & TECHNOLOGY
·
2026
·Vol. 49
·期 9
·e70305
·
IF 2
Yingqian Wang,Yongyi Wu,Cheng Peng,Wenbin Li,Donghui Zhang
The separation of methane and nitrogen is critical for upgrading low-grade natural gas. However, their similar physicochemical properties render efficient separation extremely challenging. This study explores the application of Engelhard titanosilicate-4 for N 2 /CH 4 separation. Framework thermal contractibility is tailored by regulating crystallization time. Thermal activation enables precise pore-size modulation, affording a superior separation selectivity of 15.1. Furthermore, the material properties are evaluated through structural characterization, adsorption isotherm measurements, and kinetic tests. Finally, in the simulation of a two-bed six-step vacuum pressure swing adsorption (VPSA) process, the obtained methane product has a purity exceeding 95%, validating the promising practical application potential of this adsorbent.
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2025
·
IF 4.3
Ying Zhao,Min Wang,Guangming Liao,Yezhen Chen,Yukun Hu,Longyu Tian,Zaijun Lu
With the rapid development of communication technologies, there is an urgent need for materials that simultaneously possess excellent dielectric properties and high thermal stability to ensure efficient signal transmission. In this study, a molecular-level microphase structure modulation strategy is proposed, in which vinyl-functionalized calix[4]arene-modified polysulfone oligomers are used to prepare a series of novel polysulfone-based crosslinked networks (VPSU-VC4As). This method demonstrates remarkable efficiency in enhancing the thermal stability and dielectric properties of the materials. After incorporating 4-tert-Butylcalix[4]arene, the glass transition temperature (T g ) of the thermosets increases from 193°C to 231°C, with T d5 exceeding 350°C and an increased char yield. Meanwhile, the dielectric constant (D k ) and dielectric loss (D f ) of the thermosets are significantly reduced (D k = 2.61 and D f = 4.6 × 10 −3 at 1 GHz). Studies reveal that this improvement is attributed to the nanoporous structure of VC4A and the presence of bulky tert-butyl groups, which increase the free volume of the polymer, reduce its density, and enhance hydrophobicity. The material also exhibits a dielectric breakdown strength of 6.97–7.77 kV/mm and a tensile strength of 27–64 MPa. This work not only confirms the unique advantages of calix[4]arene in developing low-k materials but also further optimizes the dielectric properties of polysulfone through molecular design, providing a new strategy for the development of low-dielectric materials.
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SHOCK WAVES
·
2026
·Vol. 36
·期 1
·9
·
IF 1.8
Zhang L.,Zhao C.,Xu Z.,Shi Y.,An E.,Liang J.,Cao X.
Boron (B) is considered as a high-energy additive for solid propellants owing to its high mass and volumetric calorific values. DAP-4, a novel solid energetic material, exhibits excellent detonation performance and strong oxidizing properties, making it a promising high-energy oxidizer for solid propellants. To explore the ignition and combustion characteristics of DAP-4-based boron-containing high-energy materials, mixed powders of DAP-4 and nanometric boron (nano-B) materials with varying mass ratios were prepared through mechanical blending. X-ray diffraction (XRD) analysis confirmed the crystalline structure of the DAP-4/nano-B mixed powder and the absence of additional compounds or phases. Scanning electron microscope (SEM) observations revealed that nano-B particles effectively adhered to the surface of the DAP-4 particles, with the density of attached nanometric boron increasing as its content in the samples increased. Elemental mapping and Energy Dispersive X-ray Spectroscopy (EDS) further validated this surface modification. TG-Differential Scanning Calorimetry (DSC) analysis indicated good compatibility between DAP-4 and nano-B, with minimal mutual influence during thermal decomposition under heating. The ignition and combustion characteristics of the DAP-4/nano-B mixed powders were investigated using a shock tube at temperatures of 2200–3100 K and pressures of 0.1 MPa and 0.5 MPa. Results showed that both ignition delay time and burn time decreased with increasing temperature, whereas pressure had a negligible effect. As the boron content increased from 0 to 30%, the ignition delay time decreased, while the burn time initially decreased and then increased. Overall, the addition of nano-B effectively enhanced the combustion of DAP-4/nano-B mixed powders. In practice applications, the ignition and combustion performance of DAP-4 can be tailored by adjusting the mass fraction of boron powder.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Jingna Liu,Bingqing Chen,Qianyi Hu,Qiong Zhang,Bingqing Huang,Peng Fei
To augment the functional attributes of pectin and expand its prospective utilization in food preservation, this research explored the enzymatic grafting of resorcinol and 4-hexylresorcinol onto pectin. Structural analysis verified the successful grafting of both resorcinol and 4-hexylresorcinol to pectin via esterification , with the 1-OH of resorcinol and 4-hexylresorcinol and the carboxyl group of pectin functioning as grafting sites. The grafting ratios of resorcinol-modified pectin (Re-Pe) and 4-hexylresorcinol-modified pectin (He-Pe) were 17.84 % and 10.98 %, respectively. This grafting modification notably enhanced the antioxidative and antibacterial properties of pectin. Specifically, DPPH clearance and the inhibition ratio in the β-carotene bleaching assay increased from 11.38 % and 20.13 % (native pectin, Na-Pe) to 41.15 % and 36.67 % (Re-Pe), and 74.72 % and 53.40 % (He-Pe). Moreover, the inhibition zone diameter against Escherichia coli and Staphylococcus aureus rose from 10.12 and 10.08 mm (Na-Pe) to 12.36 and 11.52 mm (Re-Pe), and 16.78 and 14.87 mm (He-Pe). Additionally, the application of native and modified pectin coatings effectively impeded pork spoilage, with the modified pectins demonstrating a more potent effect. Among the two modified pectins, He-Pe exhibited the most significant enhancement in pork shelf life.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Mingjie Han,Yuhao Xu,Ri Wang,Yong Xie,Yuekun Wang,Chao Bian,Shanhong Xia
Mercury ions (Hg2+) are highly toxic, which can contaminate the environment and cause serious harm to human health. In this work, we report a portable, high-performance, and reusable boron-doped diamond (BDD) electrochemical sensor, which takes the advantages of 4-mercaptopyridine-functionalized gold nanoparticles (4-MPY/Au NPs) as the sensing element. Due to the specific coordination between Hg2+ and nitrogen of pyridine, Hg2+ can be captured by the 4-MPY to form a Hg(pyridine)2 complex, which leads to the reduction of electrochemical activity at the electrode surface. The current variations are monitored by differential pulse voltammetry (DPV) in solution containing the [Fe(CN)6]3–/4– redox probe. Under optimal conditions, the proposed sensor exhibits an excellent logarithmic relationship in the range of 0.001–10 μg/L with a low limit of detection (LOD) of 0.358 ng/L. In addition, the sensor is validated with satisfactory recovery of tap water samples, demonstrating its potential for on-site monitoring of the water environment.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Huanhuan Sun,Hongyan Yu,Boyang Han,Junjie Ma,Rensheng Wang,Yanping Song
Pressure-induced surface-enhanced Raman spectroscopy (PI-SERS) is among the foremost achievements of high-pressure fields, benefiting from the advantage that pressure-modulated interactions between substrates and molecules overcome the weakness of individual substrates or molecules. However, the pressure corresponding to PI-SERS enhancement is currently still at a low-pressure stage within 8 GPa. Therefore, how to realize PI-SERS enhancement under higher or ultrahigh pressure remains a huge challenge. Here, we applied few-layer WS2 (FL-WS2) nanosheets as PI-SERS substrates and selected 4-mercaptobenzoic acid (4-MBA) molecules with a big energy gap as probes to explore PI-SERS enhancement in more depth. The experimental results indicate that the PI-SERS signals increase gradually as pressure increases and reaches a maximum at 18 GPa, which has set a pressure record for the PI-SERS field so far. Different from the C exciton resonance-induced SERS intensities at ambient conditions, the charge-transfer transition between FL-WS2 and 4-MBA is strengthened via the pressure-induced increase in the band gap of FL-WS2 and decrease in the highest-occupied molecular orbital–lowest unoccupied molecular orbital (HOMO–LUMO) energy gap of 4-MBA, thus enhancing PI-SERS signals accordingly. Therefore, this strategy will be beneficial for practical applications in the field of optoelectronics and for the design of other PI-SERS sensors for trace detection in complex and extreme environments.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Weichao Xu,Yuxuan Yi,Kunhao Guo,Anming Li,Xuehan Zhang,Feng Guo
The combination of photocatalysis and enzyme catalysis makes many previously difficult or slow chemical reactions easy to realize. A novel [email protected] −C 3 N 4 biohybrid catalyst was successfully synthesized using a simple in situ synthesis method to remove 4- tert -butylphenol (4- t -BP). A series of characterization methods were used to investigate the structure, morphology, chemistry, and optical properties of biohybrid catalysts. [email protected] −C 3 N 4 has improved photogenerated electron-hole pair separation efficiency and charge carrier mobility , as well as photocatalytic activity, with a removal rate of 4- t -BP nearly 100% within 180 min. The catalyst recycling test revealed that the composite could maintain its high removal efficiency after 10 recyclings. Meanwhile, the photocatalytic mechanism investigation reveals that ∙O 2 − play critical roles in the removal of 4- t- BP by g−C 3 N 4 . A detailed examination of the mechanism and pathway of 4- t -BP removal by photoenzyme oxidation was also carried out. This biohybrid catalyst opened up a new avenue for the advancement of environmental protection technology .
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wangzhe Xia,Fei Zhao,Pai Fang,Mingze An,Junjiang Zhu,Kai Cheng,Minggui Xia
Magnetic iron oxides are usually employed as main components of 4-nitrophenol (4-NP) reduction catalysts. Here, magnetic Fe 3 O 4 nanoparticles (Rec-Fe 3 O 4 ) recycled from rolling oil sludge (ROS) were directly applied in 4-NP reduction reaction. The Rec-Fe 3 O 4 nanoparticles were high purity of Fe 3 O 4 with 0.9 % C content, which were further probed as carboxylates and hydrocarbon alkyl species. Compared with commercial nano-Fe 3 O 4 (Com-Fe 3 O 4 ), the Rec-Fe 3 O 4 exhibited excellent 4-NP reduction performance with easy magnetic separation showing complete 4-NP conversion to 4-AP within 270 s, and its activity remained stable even after 5 consecutive cycles. Its activation energy was also estimated to be far much less than that of Com-Fe 3 O 4 . Benefiting from its special spontaneous formed Fe 3 O 4 @C structure during ROS generation, more active low valence Fe species remained and C shell accelerated electronic transfer on the Rec-Fe 3 O 4 surface, both of which led to superior activity during 4-NP reduction reaction. This finding opens up a new insight to both of utilizing ROS waste resource and green synthesis of highly efficient 4-NP reduction catalysts.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Caihong Fang,Xiaomin Jiang,Xin Wang,Jinwu Hu,Ran Li
The exploration of nanocatalysts with a desirable activity and chemselectivity toward hydrogenation reaction of nitroarenes to arylamines remains a formidable challenge. Herein, we report novel PdRu nanoalloys with a hollow, porous, and cubic morphology. The as-prepared PdRu nanocrystals exhibit a significantly improved and composition-dependent catalytic activity and selectivity toward the hydrogenation of 4-nitrostyrene at atmospheric pressure and low temperatures. Especially, the Pd 81 Ru 19 catalysts show a high chemoselectivity (almost 100 %) to produce 4-ethylbenzenamine after the reaction was initiated for just 2 h at 50 °C. The conversion also reaches up to 100 % after the reduction reaction was carried out for only 1 h. The PdRu nanocatalysts also show excellent stability in both the cycling tests and structural characterization. This work therefore provides an effective strategy for rational design of nanocatalysts to realize high-efficiency hydrogenation reaction with desirable activity and selectivity.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Ahmed I. El-Tantawy,Shimaa M. Elsaeed,Rana R. Neiber,Wael H. Eisa,Abdel Aleem H. Abdel Aleem,Ahmed A. El-Hamalawy,Mai S. Maize
Two novel mono- and bis-thioureidophosphonate cores (referred by MTP & BTP, respectively) were facilely synthesized in ionic liquid conditions and incorporated with silver nanoparticles (Ag NPs) via in-situ reduction method giving two heterogeneous nanocatalysts, denoted as Ag NP/MTP and Ag NP/BTP, respectively. X-ray diffraction (XRD), ultraviolet-visible (UV–Vis), and high-resolution transmission electron microscopy (HR-TEM) tools were conducted for the as-fabricated Ag NP/TP nanocomposites revealing the good dispersion of Ag NPs in spherical black dots with average size ranges of (∼9.5–12.7 nm) and (∼17.0–22.5 nm) for Ag NP/MTP and Ag NP/BTP, respectively. The Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) techniques clarified that, MTP possessing (P O Ph, P O, C=S, HC O, and >NH) functionalities were participated in the reduction of Ag + ions to Ag 0 NPs. The catalytic properties of both Ag NP/TP nanocomposites were verified through the chemical conversion of 4-nitrophenol (4-NP) to less hazardous 4-aminophenol (4-AP) comparable to the slight catalytic reduction of Ag NPs-free TP derivatives. To assess the catalytic performance, some kinetic parameters such as rate constant (K app ), normalized rate constant (K nor ), and turnover frequency (TOF) were estimated at the highest concentration of 4-NP. Accordingly, Ag NP/MTP exhibited more remarkable catalytic activity and durability toward 4-NP reduction than that of Ag NP/BTP. The simple stereochemistry and accessibility of active sites for MTP tuned the surface function with Ag + ions, affording more stable and regular Ag NPs over the same nanoparticle with BTP. Regarding Ag NP/MTP, catalytic improvement rates to 69%, 64%, and 69% were respectively recorded for K app , K nor , and TOF over Ag NP/BTP. Moreover, both nanocatalysts demonstrated good surficial stability through 10 consecutive cycles. Herein, this study has provided a new sustainable route for developing new TP-wrapped metal nanocomposites as robust and selective platforms in catalytic and environmental applications.
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Molecular Catalysis
·
2023
·
IF 4.6
Xuewu Ji,Guirong Bao,Peng Gao,Jia Luo,Dequan Chen,Zhen Fang
Vanillin hydrodeoxygenation (HDO) was studied in water and methanol using palladium-decorated carbon dots (Pd/CDs). The catalyst was synthesized from photo-reduction of palladium acetate using CDs as the reducing and dispersion agent, while CDs were produced via microwave treatment of glucose and urea. Pd/CDs were characterized with XRD, TEM, FT-IR, XPS, BET and ICP-OES. The selectivity to 2‑methoxy-4-methylphenol (MMP), at vanillin conversion of 100 % after 4.0 h was 98.8 % at 140 °C under 4.0 MPa of H 2 in water with 4.58 wt.% of Pd/CDs. The stability of Pd/CDs was also investigated after four times recycle under the optimal reaction conditions. CDs supported Pd reduced with NaBH 4 and hydrazine hydrate (Pd/CDs-S and Pd/CDs-H) and other carbonaceous materials (active carbon and OH functionalized multi-walled carbon nanotube) supported Pd (Pd/AC and Pd/CNTs) were also investigated for comparison. The highest selectivity to MMP achieved by Pd/CDs produced via photoreduction brings a novel use of this type of catalyst in the conversion of biomass into value-added chemicals and materials.
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