VACUUM
·
2024
·
IF 3.8
Xiaoying Yu,Chunhong Gao,Jinjia Liu,Jiang Wang,Meilin Jia,Gala Sa,Aiju Xu
Photocatalytic technology has good stability and ecological friendliness which is used to treat organic pollutants in wastewater. In this paper, TiO 2 , 1.5%V–TiO 2 and N, V co-doped TiO 2 were synthesized by hydrothermal method for photocatalytic degradation of tetracycline. Meanwhile, XRD , HRTEM , SEM, FT-IR, XPS, UV–Vis DRS , PL and electrochemistry tests were used to characterize the catalysts. The results showed that the appropriate amount of N, V co-doped can cause structural changes of TiO 2 . The co-doped of N and V enhanced the photocurrent response of TiO 2 , increased the specific surface area, reduced the band gap, and improved the efficiency of photodegradation of tetracycline. Accordingly, the tetracycline photocatalytic degradation path was proposed. 6%N-1.5%V–TiO 2 completely degraded tetracycline into CO 2 , H 2 O and NO 3 − . The calculation results show that an appropriate amount of N, V co-doped TiO 2 decreased bandgap, improved the optical absorption performance of TiO 2 . This work demonstrated the potential of N, V co-doped to design efficient photocatalysts .
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ChemistrySelect
·
2024
·Vol. 9
·期 3
·e202304182
·
IF 1.9
Yiguo He,Mengxiang Li,Liming Peng,Tong Yang,Dong Zhang,Yadong Zhang
Graphical Atorvastatin calcium is a pivotal pharmaceutical for the treatment of primary hypercholesterolemia, with the reaction between isobutyl acetate and aniline being a crucial step. By employing continuous flow synthesis technology, we achieved a yield of 94 % within a residence time of 15 minutes. Simultaneously, kinetic studies and CFD calculations were conducted. Subsequently, we conducted further reaction investigations and designed a continuous system. 4-methyl-3-oxo-n-phenyl-pentanamide, as a crucial component of atorvastatin calcium, often generates a large amount of by-products in conventional synthesis. Here, we first developed a continuous microflow system for the continuous flow synthesis of 4-methyl-3-oxo-n-phenyl-pentanamide. Compared to traditional batch reactors, the reaction time was reduced by 1/12 in the microreactor. Using this device, the kinetic parameters of the reaction were determined, and a reaction kinetics model was established to investigate the effects of channel geometry and material inlet velocity on the entire reaction system. Furthermore, we studied the subsequent reactions and successfully established a fully continuous synthesis device, where the two-step continuous flow chemical reactions were achieved at 40 minutes and a total yield of 32 %.
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TALANTA
·
2024
·
IF 5.6
Qing Liu,Si Chen,Yiming Nie,Qian Li,Fang Chen
4- n -butylresorcinol (4nBR) is a frequently utilized as whitening ingredients in skincare cosmetics. Compared with other whitening ingredients, it can effectively inhibit tyrosinase with lower toxicity and superior inhibition efficacy. Under alkaline conditions, an induced oxidative coupling reaction can occur between 4nBR and dopamine (DA) to generate strong fluorescent substance azamonardine with an intense emission band centering at 476 nm when excited at 440 nm. This phenomenon can be used to establish a fluorescence analysis method for 4nBR. The results indicated that the linear range of the method was 1.0–24.0 nmol L −1 , and the detection limit was as low as 0.25 nmol L −1 . The method showed high sensitivity, good selectivity, mild experimental conditions and low cost. The proposed method was successfully used to detect 4nBR in cosmetics, and the results were consistent with those of HPLC. The spiking recoveries were between 98.2% and 108 %.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mengwen Zhang,Fanyu Meng,Binyang Jiang,Jinsheng Li,Lei Fan,Shoulei Yang
To further enhance the performance of Al 2 O 3 -Ti(C,N) composites, this study employed novel sinter forging and dynamic sinter forging techniques, comparing them with conventional hot pressing and oscillatory pressure sintering. The results revealed that the composites produced by all four processes exhibited high density and no phase transition or formation of new phases. However, the composites prepared by sinter forging and dynamic sinter forging exhibited significantly improved strength and hardness. The hardness of the composites produced by sinter forging increased to 23.39 GPa, while the strength reached 1142 MPa, representing a 61 % improvement compared to those sintered by hot pressing. This improvement can be attributed to the significant plastic deformation induced by the sinter-forging process, which results in a higher dislocation density at the grain boundaries and within certain grains, enhanced coordinated deformation between grains, and stronger grain boundary bonding. Furthermore, the average grain size was smaller. Therefore, sinter forging and dynamic sinter forging offer substantial advantages in the preparation of advanced ceramics.
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MACROMOLECULES
·
2024
·
IF 5.1
Wenxiao Liu,Xuehua Deng,Yutong Dong,Sunting Xuan,Zhengbiao Zhang
The synthesis of N-substituted polypeptides is challenging due to steric hindrance. Here, N-alkyl poly(l-alanine)s, with controlled molecular weights (Mns) and narrow distributions, were efficiently synthesized by primary amine-initiated and acetic acid-catalyzed ring-opening polymerizations of N-alkyl-(l)-alanine N-carboxyanhydrides [NAlkyl-(l)-Ala-NCAs] in toluene of low polarity and low proton-accepting ability. The N-alkyl poly(l-alanine)s, with chiral centers at backbones and different alkyl substituents at side chains, showed a relatively extended helical structure similar to that of the PPII-helix of poly(l-proline). The elongation of the alkyl side chains and the increase in temperatures had negligible effects on the helix structure, as revealed by the circular dichroism measurements. The differential scanning calorimetry and X-ray diffraction measurements showed that the polymers were crystalline. Besides, the NAlkyl-(l)-Ala-NCAs were capable of copolymerizing with other monomers, producing structurally diverse copolymers. The efficient synthesis of N-alkyl poly(l-alanine)s, combined with the structural tunability, hydrophobicity, crystallinity, protein-like skeleton, enzymatic stability, and stable helix, makes the polymers attractive structural units in self-assembly and the biomedical field.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Zehong Zhu,Qingxin Wu,Xueying Wang,Haiyang Zhang,Jian Li,Yanzhao Dong,Yongsheng Xu,Yunsheng Dai,Jinli Zhang
Here, the spiral mesoporous hydrothermal carbonaceous nanospheres (SMHNs) were designed and fabricated from pentose precursors to enhance gas diffusion in acetylene hydrochlorination. Through the optimization of hydrothermal conditions, the optimized SMCNs-800 material showcased the highest catalytic activity with an acetylene conversion of 77 % under the condition of GHSV (C 2 H 2 ) = 30 h −1 . The structural analysis indicated that the material with helical structure could provide larger pore sizes and abundant defect sites, exposing more active sites. The structure-activity relationship among acid-base properties of the catalyst surface, the adsorption-desorption capacity for the reactants and the catalytic activity jointly demonstrated that pyridine-N and -C=O could provide abundant basic sites for the adsorption and activation of H-Cl, thus accelerating the process of acetylene hydrochlorination reaction.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Jianglu Teng,Xibin Shen,Guohua Hang,Yuan Gao,Jiawei Hu,Sixun Zheng
The reaction of 4-(hydroxymethyl)phenylboronic acid with triethanolamine was carried out to synthesize a boronic ester diol featuring boron–nitrogen (B–N) coordination. This diol served as a chain extender, allowing B–N-coordinated boronic ester bonds to be introduced into polyurethane (PU) networks. Toward this end, we first synthesized a series of α,ω-dihydroxyl polyurethane telechelics with α,ω-dihydroxypropyl poly(dimethylsiloxane) as the polymeric diol. By varying the molar ratio of the boronic ester diol to 1,4-butane diol, the α,ω-dihydroxyl polyurethane telechelics were synthesized with variable contents of the dynamic covalent bonds. Thereafter, the reaction of α,ω-dihydroxyl PU telechelics with 3-isocyanatopropyl triethoxysilane was carried out to gain α,ω-ditriethoxysiloxane PU telechelics. The latter were readily cross-linked via the sol–gel process to afford the mechanically robust PU networks, with Young’s modulus and tensile strength as high as 302.7 and 35.4 MPa, respectively. More importantly, the reprocessing properties were imparted to the PU networks. Compared to the control PU network, the reprocessing temperature was depressed to 120 °C. In the meantime, the shape memory properties of PU networks were significantly improved through the introduction of dynamic covalent bonds. Furthermore, the shape memory networks featured reconfigurability with the introduction of B–N-coordinated boronic ester bonds.
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Nanoscale
·
2024
·
IF 5.8
Dongjie Zuo,Ayisha He,Hui Shen,Huifang Guo,Qinghua Xu,Zilin Li,Simin Li
N-heterocyclic carbene (NHC) ligands have emerged as highly effective surface ligands for the protection and functionalization of metal nanoclusters (NCs). However, research on NHC-stabilized metal NCs, including their synthesis, structure, properties, and applications, is still in its early stages. In this study, we present the first gold-copper alloy cluster protected by both NHC and alkyne ligands, denoted as Au3Cu(iPrNHCiPr)(PA)4 (abbreviated as Au3Cu, where iPrNHCiPr is a bidentate N-heterocyclic carbene ligand with isopropyl as the N-substituent, and PA is a phenylethynyl group). The precise composition of Au3Cu was confirmed through the utilization of electrospray ionization mass spectrometry (ESI-MS), and its structure was determined via X-ray single-crystal diffraction. It is worth noting that although the Au3Cu clusters do not display substantial light emission when exposed to UV lamps, they are capable of emitting green fluorescence subsequent to undergoing mechanical milling (
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LANGMUIR
·
2025
·
IF 3.9
Junsheng Wang,Gege He,Jinke Shen,Xiaozhen Lv,Hongyu Mi,Shun Lu
Transition metal and nitrogen codoped graphitic carbon materials with Co–N bonds serve as key non-noble-metal catalysts for the oxygen evolution reaction (OER). To enhance catalytic efficiency, we explore the anchoring of Co–N bonds on nitrogen-doped graphitic carbon (NC) substrates with varied phosphorus content. The catalyst is synthesized through a straightforward sintering and phosphating process of ZIF@DCA in a tube furnace. X-ray photoelectron spectroscopy (XPS) demonstrated that the Co–N bonds effectively formed an efficient charge transfer channel, removing the barrier that separated the Co–N active site from the work electrode surface. Phosphorus is uniformly distributed across the Co–N substrate, ensuring the exposure of most Co–N active sites during the electrochemical reaction. With favorable structural and electronic attributes, P/Co–N-2 showcases the lowest overpotentials at 10 and 300 mA cm–2, which are 200 and 300 mV, respectively. Additionally, it demonstrates stable performance over 100 h in 1 M KOH, outperforming other similar materials and RuO2. This study offers critical insights for the rational design of Co–N structures, exploring the interplay between structure, composition, and activity in electrochemical reactions.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Chen Wang,Haobo Yan,Songlin Li,Yuesen Shi,Mingluo Du,Pengfei Cheng
Morphology-engineered ternary metal oxides have gained increasing attention for their potential in precise and sensitive gas detection. In this work, different Zn₂SnO₄ (ZTO) nanostructures were synthesized via a simple alkali-assisted hydrothermal route. The ZTO microcrystals with a polyhedral shape exhibited the largest specific surface area and content of surface-active oxygen species than cubic and plate-like counterparts. Additionally, the gas sensor based on the ZTO-polyhedron demonstrated outstanding n-butanol sensitivity, along with rapid response and recovery times, good repeatability and long-term stability. Furthermore, density functional theory (DFT) simulations were conducted to investigate the adsorption behavior of n-butanol on different crystallographic facets of ZTO to further elucidate the mechanism of ZTO-Polyhedron for the enhanced performance toward n-butanol. The results highlight the significant potential of this type of sensor for industrial and environmental detection applications and emphasize the critical role of nanostructural design in optimizing sensor performance.
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CHEMISTRY OF MATERIALS
·
2025
·
IF 7
Bangjian Liu,Hong Yang,Limin Ren,Zhaoyang Song,Quanjie Liu,Shuandi Hou,Anfeng Zhang,Xinwen Guo
In this study, a rapid synthesis of ZSM-50 zeolites is achieved by a two-step aging–crystallization hydrothermal method. By optimizing the temperature/time for aging (393 K/48 h) and crystallization (423 K/72 h), the synthesis time for obtaining pure-phase ZSM-50 zeolites has been significantly shortened to 4 days from typically weeks. The gel compositions to form pure-phase ZSM-50 have also been mapped out in the ternary composition diagram of 5Al2O3/SiO2–OSDA/SiO2–OH–/SiO2 under the optimized aging–crystallization conditions. Furthermore, three ZSM-50 samples are synthesized using different gel compositions and/or crystallization conditions. The samples have different acidity characteristics and average crystal sizes from 5 to 17 μm. As catalysts for n-heptane hydroisomerization, the three Pt-loaded ZSM-50 catalysts deliver the maximum iso-heptane yield directly correlated to their surface weak Brönsted acid sites on the external surface. The ZSM-50 (5 μm) catalyst has a superior catalytic activity, achieving a maximum iso-heptane yield of 71.4% at 543 K, along with a high fraction of multibranched isomers of 29.1%. This study highlights the pivotal role of particle size in modulating acid properties and pore accessibility in ZSM-50 and offers a facile strategy for designing effective bifunctional catalysts for n-alkane isomerization.
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Results in Chemistry
·
2025
·
IF 4.2
Zhengyue Zhu,Jiancong Ye,Tao Ye,Jialong Zou,Junjie Ye,Qi Li,Yan Liu
The effects of different additions of dimethyl sulfoxide (DMSO) to poly(N-isopropyl acrylamide)/sodium alginate hydrogels(D-PNIPAM/SA) on the desalination of saline soil were investigated in this study. The effects of liquid absorption rate(LAR) of the D-PNIPAM/SA by temperature, NaCl concentration, and DMSO addition amount were studied. And the deswelling rate(DR) tests of different DMSO addition amounts were also investigated. The LAR decreased significantly with the temperature increase from 20 °C to 35 °C and with the increase of NaCl concentration from 0.597 g/L to 7.714 g/L. The LAR increased while the DR decreased with the DMSO addition increased from 0 ml to 3.5 ml. The results indicated that the optimal addition of the DMSO was 3.5 ml. In this addition, the D-PNIPAM/SA was observed in its best form by an Ultra-depth of field 3D microscope, and the phase transition temperature was reduced to −2.95 °C. In NaCl solution, DMSO was added from 0 ml to 3.5 ml, and the D-PNIPAM/SA absorption rate increased from 6.60 g/g to 12.41 g/g.In the desalination of saline soil study, the desalination rate of the D-PNIPAM/SA was reached 88.609 % in the saline soil solution test, and the desalination rate reached 94.765 % in the dry saline soil test.
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