PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2025
·
IF 2.9
Xuan Yue,Xiying Fu,Feibo Li,Aifeng Liu
Polymer particles with precisely controlled shapes and internal architectures have garnered significant attention owing to their unique physical properties and diverse potential applications. In this study, we present a systematic investigation of the morphological evolution of polystyrene-block-poly(4-vinyl pyridine) (PS-b-P4VP) assemblies under three-dimensional (3D) confinement, induced by n-butanol through hydrogen bonding interactions with 4VP units. The selective localization of n-butanol within the P4VP domains leads to an expansion of its volume fraction and a substantial alteration in the hydrophilicity of the P4VP block. Consequently, these PS-b-P4VP self-assemble into particles with onion-like structure or spherical internal structure. Notably, the synergistic co-assembly of gold nanoparticles (AuNPs) with PS-b-P4VP yields core–shell-corona hybrid spheres and hybrid onion-like nanoparticles, which exhibit remarkable potential for applications in advanced sensing technologies, heterogeneous catalysis, and targeted drug delivery systems.
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Scientific Reports
·
2019
·Vol. 9
·期 1
·1-8
·
IF 4.011
Xu Airong,Wang Yongxin,Liu Rukuan
The utilization of cellulose in industrial applicat is of great significance to sustainable development of human society and reducing dependence on dwindling fossil resources. Nevertheless, this utilization of cellulose has actually been limited due to its insolubilization. Here, novel solvents consisting of diallylimidazolium methoxy acetate ([A 2 im][CH 3 OCH 2 COO]) and N- methylpyrrolidinone (NMP) were developed. The solubility of cellulose in [A 2 im][CH 3 OCH 2 COO]/NMP was determined, and the influence of [A 2 im][CH 3 OCH 2 COO]/NMP molar ratio on cellulose dissolution was systematically investigated. Meanwhile, we also presented the affecting factors of the cellulose material fabrication including preparation approach, [A 2 im][CH 3 OCH 2 COO] and cellulose solution concentration. Attractively, the [A 2 im][CH 3 OCH 2 COO]/NMP solvents display much powerful dissolution capacity for cellulose even at 25 °C (25.4 g 100 g −1 ). This is mainly ascribed to the combined factors: The hydrogen bond interactions of the H2, H4 and H6 in [A 2 im] + and carboxyl O atom in [CH 3 OCH 2 COO] − with the hydroxyl H atom and O atom in cellulose; the dissociation of NMP towards [A 2 im][CH 3 OCH 2 COO]; the stabilization of NMP towards the dissolved cellulose chains. In addition, the thermostability and chemical structure of the regenerated cellulose from the solvents was also estimated.
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CATALYSIS LETTERS
·
2012
·Vol. 142
·期 3
·378-383
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IF 2.242
Zhang Rui,Huang Lei,Zhang Yanfang,Chen Xiaorong,Xing Weihong,Huang Jun
A heterogeneous silver catalyst was prepared and applied efficiently for the selective bromination of aromatics with NBS. The silver nanoparticles combined with the acidic support HMB can activate both the aromatic ring and NBS, and the synergistic effects between the silver nanoparticles and the HMB highly enhanced the efficiency of the bromination reaction. Graphical
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Catalysis Science & Technology
·
2026
·
IF 4
Shixuan Li,Dongha Huang,Jiao He,Vasanthakumar Vasudevan,Boqing Chen,Wenjie Zhang,Tingting Wu,Xiao Wu,Xiao yan Xiang,Jinqing Lin
Nitrogen doping serves as a viable strategy to improve the activity of heterogeneous Fenton-like catalysts, whereas the practical deployment of Fenton-like technology is restricted by the complexity of nitrogen-doping procedures. Herein, a in-situ nitrogen-doped Fenton-like catalyst was synthesized through calcination from an in-situ iron-incorporated hyper-cross-linked polymer, where aniline functions as both carbon and nitrogen source while FeCl3 serves dual roles as catalyst for the polymerization and iron precursor. The resulting α-Fe2O3/N-CHCP materials were systematically evaluated for methylene blue (MB) degradation via heterogeneous Fenton-like reactions. Comprehensive characterization demonstrates that nitrogen doping effectively modulates the electronic structure of the carbon matrix, facilitating enhanced charge transfer kinetics and promoting efficient ≡Fe3+/≡Fe2+ cycling for superior H2O2 activation. The optimized α-Fe2O3/N-CHCP-2 catalyst exhibits exceptional catalytic performance, achieving complete removal of MB (100 mg L−1) within 15 min under neutral conditions (pH 7.3) with a high apparent rate constant (kobs) of 0.4732 min−1 significantly surpassing the N-free α-Fe2O3/CHCP catalyst (kobs = 0.0159 min−1). The α-Fe2O3/N-CHCP-2 catalytic system also demonstrates remarkable operational flexibility, maintaining high efficiency across a broad pH range (3-10) and in the presence of some common inorganic coexisting ions. Mechanistic investigations, supported by quenching experiments and EPR spectroscopy, reveal that hydroxyl radicals (•OH) are the predominant reactive species, whereas superoxide radicals (•O2−) contribute secondarily to the degradation process. This work establishes an effective synthetic approach for constructing advanced in-situ N-doping and metal-nitrogen-carbon coordination systems with optimized interfacial electron transfer properties, offering promising applications in advanced oxidation processes for wastewater remediation.
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Molecular Catalysis
·
2026
·
IF 4.3
Jiarong Zhang,Christian Marcus Pedersen,Shuwei Chen,Yingxiong Wang,Yan Qiao
A green epimerization system using only water and CaCl 2 . • NMR identifies products, by-products, and reveals the mechanism. • Isotope labeling and DFT confirm the epimerization pathway. • A direct route to ManNAc from a biomass monomer. N -acetyl- d -mannosamine (ManNAc) is a valuable precursor in the pharmaceutical and biotechnology industries. Enzymatic epimerization of N -acetyl- d -glucosamine (GlcNAc) offers mild and green conditions for ManNAc production, while its productivity is limited by poor enzyme stability and high costs. Although efficient chemical methods have been developed, they often require strict control of reaction conditions to avoid by-product formation, and their reaction mechanisms remain unclear. This study presents a green and efficient strategy for ManNAc synthesis through calcium chloride (CaCl 2 )-promoted epimerization of GlcNAc in aqueous solution. ManNAc production reached a yield of 27% under optimized conditions. The reaction mechanism was elucidated through a combination of nuclear magnetic resonance (NMR) spectroscopy and density functional theory (DFT) calculations. Using deuterium oxide (D 2 O) as the reaction medium revealed hydrogen-deuterium exchange at the C2 position of GlcNAc, providing direct experimental evidence for a reaction pathway involving an enol intermediate. This finding was further supported by subsequent 13 C isotopic labeling experiments. DFT calculations further revealed that water molecules play a critical role in mediating proton transfers, significantly reducing the energy barriers of the key steps of enol intermediate formation. CaCl 2 enhanced the yield by promoting the formation of the enol intermediate. Additionally, a preliminary investigation was conducted on the purification of ManNAc from the reaction mixture containing its structural epimers. This work not only provides a green system for ManNAc synthesis but also offers profound insights into the reaction mechanism, paving the way for developing more efficient biomass utilization strategies. Download: Download high-res image (515KB) Download: Download full-size image
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Wenfei Zhang,Qulan Zhou,Na Li,Mingtao Li
The synthesis of photocatalysts with good activity and strong product selectivity is of strategic importance for photocatalytic reduction of carbon dioxide (CO 2 ). In this study, an improved sol-gel method was employed for the synthesis of N-doped TiO 2 , Eu-doped TiO 2 , and N, Eu co-doped TiO 2 photocatalysts. The phase structures, optical and electrical properties of the catalysts were thoroughly investigated by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller Surface area analysis, Ultraviolet-visible diffuse reflectance spectroscopy, Photoluminescence spectroscopy, and electrochemical measurements. The experimental results of photocatalytic CO 2 reduction indicated that both N and Eu doping could effectively improve the photoresponse of TiO 2 , but the synergistic effect of N and Eu made the N, Eu co-doped TiO 2 exhibit superior photocatalytic activity and product selectivity, the formation rate of methane (CH 4 ) by photocatalytic reduction of CO 2 using N-Eu/TiO 2 as the catalyst could reach 13.48 μmol·g cat −1 ·h −1 , which was about 12 times higher than that of pure TiO 2 , and the selectivity reached nearly 100%. Finally, this synergistic effect was explained using DFT calculation and in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and the possible mechanism of photocatalytic CO 2 reduction over N-Eu/TiO 2 was elucidated.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 5
·1-12
·
IF 2.8
Wang Ze-Hong,Jia Yun-Ning,Wu Xiang-Feng,Song Meng-Chen,Ma Xiao-Ye,Wang Hui,Zhang Xue-Feng
Semiconductor photocatalysis is a promising method to solve the problem of antibiotic pollution in water. A series of Bi 2 SiO 5 /BiVO 4 composite photocatalysts for tetracycline and levofloxacin degradation are prepared by a two-step hydrothermal method. Analysis results show that the as-prepared Bi 2 SiO 5 /BiVO 4 (2:3) hybrid exhibits better photocatalytic activity than pure samples under visible light illumination. The photocatalytic degradation efficiency of the as-prepared composite shows the maximum of 72.2% within 120 min for tetracycline, which is higher than 43.5% of pure Bi 2 SiO 5 and 67.2% of pure BiVO 4 , respectively. Furthermore, it is 80.3% within 120 min for levofloxacin, which is higher than 7.6% of pure Bi 2 SiO 5 and 69.7% of pure BiVO 4 , respectively. The formation of n–n isotype heterojunction at the interface of Bi 2 SiO 5 and BiVO 4 in the as-prepared composites causes to the improvement of the transport rate and separation efficiency of the photogenerated electron and hole pairs. In addition, the holes play a dominant role in the photocatalytic degradation process. This work will provide a reference for the study of visible light driven photocatalysts to solve antibiotics pollution in water.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 7
·1753-1761
·
IF 3.146
Wei Zuojun,Cheng Yuran,Chen Mengting,Ye Yuhua,Liu Yingxin
Using nitrogen-doped mesoporous carbon (NMC) as the support, several NiRe bimetallic catalysts with low metal loading of 1 wt% were designed and prepared for the selective deoxygenation of oleic acid to n-heptadecane in the absence of hydrogen. Results showed that the Ni 80 Re 20 /NMC catalyst with a Ni/Re molar ratio of 80: 20 achieved the highest yield of n-heptadecane (92.3%) at 330 °C for 2 h in isopropanol solvent, and at a metal/oleic acid weight ratio of 1: 333. The catalyst can be reused at least five times with slight activity loss. Combined with the results of in-situ XRD, HRTEM, XPS and CO 2 -TPD, the formation of NiRe alloy, the very fine NiRe nanoparticle size at 2.30 nm, as well as the hydrophobic, mesoporous and weakly basic properties of the NMC support surface were demonstrated to contribute to the excellent catalytic performance of the catalyst.
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RSC Advances
·
2022
·Vol. 12
·期 24
·15354-15360
·
IF 4.036
Jinghua Liu,Xiong He,Fei Guo,Baosheng Liu,Zijun Sun,Li Zhang,Haixin Chang
Owing to the wide negative potential window (∼1.2 V) along with high specific capacitance (1340 F g−1) in alkaline electrolyte, vanadium nitride (VN) has been served as promising negative supercapacitor electrode material. However, VN is easy to dissolve during cycling process and shows low capacitance retainability. Herein, a hybrid electrode (marked as VN/NCNT/NCN), featuring VN nanoparticles and N-doped carbon nanotube inserted in N-doped carbon nanosheets, has been fabricated with a facile C3N4 self-sacrificing method. The porous structure and high conductive carbon skeleton, as well as the uniform distribution of VN nanoparticles give VN/NCNT/NCN a great amount of active site and fulfill excellent electrochemical performance for VN/NCNT/NCN-based electrode. The as-fabricated hybrid electrode exhibits a maximum specific capacitance of 232.9 F g−1 at 1 A g−1. Moreover, the cycling performance has been greatly improved and the specific capacitance remains 91% after 5000 cycles.
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Soft Matter
·
2022
·Vol. 18
·期 32
·6115-6123
·
IF 4.046
Ling Wang,Shengjie Liu,Jingjing Cheng,Yao Peng,Fangfei Meng,Zhaoqiang Wu,Hong Chen
Flexible strain sensors have been extensively studied for their potential value in monitoring human activity and health. However, it is still challenging to develop multifunctional flexible strain sensors with simultaneously high transparency, strong self-adhesion, fast self-healing and excellent tensile properties. In this study, we used N,N-dimethylacrylamide (DMA) in the imidazolium-based ionic liquid 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide ([BMIM][Tf2N]) for “one-step” UV irradiation. A poly(N,N-dimethyl)acrylamide (PDMA) ion-conductive gel was prepared by site polymerization. Based on the good compatibility between PDMA and ionic liquid, the prepared ion-conductive gel has good transparency (∼90%), excellent stretchability (1080%), strong self-adhesion (67.57 kPa), fast self-healing (2 s at room temperature) and great antibacterial activity (∼99% bacterial killing efficiency). Moreover, the strain sensor based on the PDMA ion-conductive gel has good electromechanical performance and can detect different human motions. Based on the simple and easy-to-operate preparation method and the endowed multifunctionality of the PDMA ion-conductive gel, it has broad application prospects in the field of flexible electronic devices.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yong Liu,Yong Chen,Jinhua Deng,Jianlong Wang
Herein we prepared a novel nitrogen-doping aluminum-graphite (Al-Gr-N) composite and applied for generating and activating H 2 O 2 to treat the landfill leachate. The results showed that Al-Gr-N composite could significantly enhance H 2 O 2 yield by oxygen reduction reaction (ORR), about 3 times higher than that of aluminum-graphite (Al-Gr) composite, due to its abundant N species, higher content of defects carbon atoms, higher surface area and porous volume, which enhanced the activity and selectivity toward two-electron pathway of ORR by increasing electron density, and promoting the mass transfer of reaction intermediates. The H 2 O 2 concentration achieved 2049 mg/L. The H + from the hydrolysis of in-situ generated Al 3+ could improve the ORR process, leading to high efficient production of H 2 O 2 at wide pH range. The in-situ generated Al 3+ could act as the coagulant to enhance the pollutant removal. This composite could effectively treat landfill leachate due to its high H 2 O 2 and nascent aluminum.
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JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Hongjun Zang,Jing Lou,Shuolei Jiao,Huanxin Li,Yannan Du,Jiao Wang
Chitin and its derivatives contain biologically fixed nitrogen elements, which can provide nitrogen sources for N-containing chemicals. Herein, a series of pyridinium-based ionic liquids were synthesized to directly catalyze the conversion of N -acetyl-D-glucosamine (NAG, the monomer of chitin) to 3-acetamido-5-acetylfuran (3A5AF). The yield of 3A5AF in 1-carboxymethyl pyridinium chloride ionic liquid reached 37.49%, without any additives. Using B 2 O 3 and CaCl 2 as additives, the optimum yield increased to 67.37% at 180 °C in 20 min. In addition, HPLC-MS analysis has been utilized to elucidate the reaction mechanism. This research on turning “waste” into “wealth” opens up new ways for the utilization of biomass waste, which not only reduces environmental pollution but also has potential economic value.
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