APPLIED ORGANOMETALLIC CHEMISTRY
·
2015
·Vol. 29
·期 4
·240-243
·
IF 2.248
Dongsheng Bai,Zhiyong Zhang,Guangjian Wang,Fang Ma
The cycloaddition of epoxide and CO 2 to synthesize cyclic carbonate catalyzed by VO(IV) porphyrin was achieved under 1.4 MPa at 150°C. The effects of reaction temperature, time, CO 2 pressure, co-catalyst and porphyrin framework were investigated. The catalytic results showed that moderate to high yields of cyclic carbonates were obtained under the optimal reaction conditions. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
化学
·
环境科学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2023
·
IF 16.5
Zhijie Zhang,Xuesheng Wang,Huiling Tang,Deben Li,Jiayue Xu
Modulating the internal electric field (IEF) represents a potential strategy to stimulate the photocatalytic activity of heterojunctions, especially S-scheme photocatalysts. Herein, a Cs 3 Bi 2 Br 9 @V O -In 2 O 3 (CBB@V O -In 2 O 3 ) S-scheme heterojunction, of which Cs 3 Bi 2 Br 9 perovskite quantum dots (PQDs) are embedded into mesoporous V O -In 2 O 3 hosts, is rationally designed as a cornerstone for further IEF manipulation. Briefly, by introducing oxygen vacancies (V O ) into the composed reduction semiconductor (mesoporous In 2 O 3 ), an enlarged Fermi level ( E F ) gap between CBB and V O -In 2 O 3 is achieved, yielding an intensified IEF over the CBB@V O -In 2 O 3 heterojunction. Such an enhanced IEF affords a much more robust driving force for directional carrier delivery, leading to accelerated carrier transfer of CBB@V O -In 2 O 3 heterojunction. Consequently, the optimized CBB@V O -In 2 O 3 heterojunction features desirable CO 2 -to-CO conversion efficiency, and its CO production rate reaches 130.96 μmol g −1 h −1 . The reaction intermediates and CO 2 photoconversion pathway were unraveled by in-situ diffuse reflectance infrared Fourier transform spectroscopy. Combining with the DFT calculation, it was revealed that oxygen vacancies in V O -In 2 O 3 act as reactive centers, which optimize the coordination modes of the intermediates, thus reducing the activation energy for photocatalytic CO 2 reduction. Our work demonstrates that the IEF modulation of S-scheme-based heterojunction could significantly boost the charge separation and then to drive efficient catalytic reaction , achieving high-efficiency solar fuel production.
研究领域:
材料科学
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催化化学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lijun Yan,Qing Wang,Wenqiang Qu,Tingting Yan,Hongrui Li,Penglu Wang,Dengsong Zhang
Promoting the ring-opening process is vital to increase the mineralization of aromatic volatile organic compounds. Rational regulation of metal-support interaction is essential for the opening of the aromatic ring over Pt/TiO 2 catalysts. Herein, the Pt/TiO 2 -C catalyst with Ti δ+ -Vo·-Pt δ+ interface obtained by reverse electron transfer is successfully regulated via reduction–oxidation treatment for efficient photocatalytic degradation of toluene. This structure accelerates the pre-activation of toluene to generate abundant reactive intermediate species for the photocatalysis reaction. On the other hand, the special interface endows Pt/TiO 2 -C the ability to produce more reactive oxygen species under illumination, which can synergistically promote the direct opening of benzene ring. The Pt/TiO 2 -C shows a stronger oxidation capacity and a mineralization rate 15% higher than the traditional Pt/TiO 2 . This work proves that reduction–oxidation treatment is an effective approach to modify catalysts for air purification and provides a novel idea for the degradation of other aromatic volatile organic pollutants.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 111
·110229-110234
·
IF 3.289
Yangyang Ma,Zhongtian Du,Fei Xia,Jiping Ma,Jin Gao,Jie Xu
Lignin is the primary source of aromatic chemicals in nature. Selective aerobic oxidation has provided a promising approach for breaking lignin into smaller aromatics. During VO(acac)2-catalyzed oxidation of lignin model compound 2-phenoxy-1-phenylethanol, benzaldehyde was unexpectedly observed as a product, in contrast to the results reported previously. The reaction pathway was studied, and a hemiacetal-like intermediate was found to be involved, and the similar intermediate was also observed during oxidation of model compound benzyl phenyl ether. Compared with direct C–O bond cleavage, prior formation of hemiacetal-like structures via oxidation would be expected to facilitate the cleavage of the aryl ether bond in aralkyl aryl ethers under mild reaction conditions.
研究领域:
化学
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环境科学
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DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Xi Wang,Yujie Gao,Jianing Guo,Mingxing Wu
Carbon-based hole transport layer (HTL)-free all-inorganic perovskite solar cells (C-PSCs) exhibit advantages of simplified preparation procedure, high stability, and low cost, showcasing significant application potential. Nonetheless, the development of C-PSCs requires overcoming challenges such as the misalignment of energy levels between carbon counter electrode and the CsPbBr₃ perovskite, abundant defects at the perovskite/carbon back interface, and the carbon counter electrode's low conductivity. Herein, VS₄ and VO-deposited carbon nanofibers (CNF), termed VS₄@CNF and VO@CNF respectively, have been synthesized to adjust the work function and improve the conductivity of the carbon counter electrode. CsPbBr₃-based C-PSCs employing VS₄@CNF and VO@CNF as counter electrodes yield power conversion efficiencies of 7.88 % and 8.80 %, indicating great PCE enhancements of 15.4 % and 28.8 % as compared with the device with unmodified CNF counter electrodes. This improvement is attributed to the optimized conductivity and adjusted work function of the counter electrodes, which can optimize the energy level alignment, thereby enhancing charge carrier extraction and transport while effectively inhibiting recombination. Furthermore, VS₄@CNF and VO@CNF demonstrate a notable passivation effect on defects at the back interface. This study offers a valuable path for the design of novel carbon counter electrodes and the modification of the back interface in carbon-based all-inorganic C-PSCs.
研究领域:
材料科学
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能源技术
·
光电转换
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Zhenmin Xu,Ting Zhang,Junyu Lang,Mengli Xu,Ya Xie,Chunyan Wu,Huangrong Wang,Han Yu,Zhenfeng Bian
Carboxylates are commonly formed as intermediates during the oxidation of volatile organic compounds (VOCs) and are often regarded as significant barriers to the complete mineralization of organic pollutants. In this study, we present a novel cobalt-doped copper-based catalyst that employs an in situ benzoic acid-mediated oxygen activation strategy for the photocatalytic degradation of toluene under visible-light irradiation. Unlike traditional systems in which carbonyl intermediates contribute to catalyst deactivation, we demonstrate that benzoic acid, generated during toluene oxidation, acts as a potent ligand to modulate the electronic structure of cobalt sites. This interaction significantly enhances oxygen activation and promotes the generation of reactive oxygen species (ROS), facilitating the complete oxidation of toluene to CO2 with nearly 100% efficiency. In situ characterization and density functional theory (DFT) calculations reveal that the migration of benzoic acid from copper to cobalt sites under visible light is critical for the oxidation process. This migration induces a pronounced electron-donating effect, enabling activation of the Co center, which drives efficient ROS production and autocatalytic mineralization of benzoic acid. The resulting Co-Vo-Cu catalyst demonstrates exceptional catalytic activity and stability, outperforming previous systems in VOCs degradation. This work offers new insights into the role of organic intermediates in oxygen activation and presents a promising strategy for the development of next-generation photocatalysts for VOCs elimination.
研究领域:
环境催化
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光催化
·
材料化学
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表面化学
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反应机理
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产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Yaoyu Tan,Mengyao Qi,Huan Jiang,Baihui Wang,Xia Zhang
The level of uric acid is crucial to human health. Octahedral oxygen vacancy MnCo 2 O 4 /Ag (V O -MnCo 2 O 4 /Ag) nanozyme was successfully prepared by simple hydrothermal, calcination and self-reduction methods. V O -MnCo 2 O 4 /Ag nanozyme is rich in Mn 2+ /Mn 3+ and C O 2+ /C O 3+ redox electron pairs, large specific surface area and oxygen vacancies. V O -MnCo 2 O 4 /Ag nanozyme showed high uricase-like activity and peroxidase-like activity. At the same time, the SERS signal of the detected molecule could be significantly enhanced after the catalytic reaction of the V O -MnCo 2 O 4 /Ag nanozyme. The K m values of V O -MnCo 2 O 4 /Ag nanozyme for H 2 O 2 and TMB were 0.04 mM and 0.027 mM respectively. Based on the uric acid oxidase-like and peroxidase-like activities of V O -MnCo 2 O 4 /Ag, we developed a label-free, sensitive, and reliable SERS uric acid detection system. The detection linear range of uric acid is 0.01 μM–1000 μM and the detection of limit is 7.8 × 10 −9 M. The results show that the sensing system has good accuracy, sensitivity, selectivity , and stability. It can be applied to the determination of samples under different conditions. This study provides profound insights into the design of enzyme-like activity regulation and SERS properties regulation of nanozymes, provides guidance for the study of reaction kinetics and catalytic mechanism of nanozymes, and has broad application prospects in the field of nanozymes and SERS sensing analysis.
研究领域:
纳米技术
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分析化学
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生物化学
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材料科学
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医学诊断
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产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Qingyuan Ma,Hongwei He,Wenwen Yu,Jianjun Xu,Quanxin Xu,Jiaqi Xue,Yushi Jin,Rong Zhu,Chen Han,Zhengkun Wang,Chen Cui,Jie Ma,Fuyong Liu,Heng Zhang,Huayun Du
Highly efficient regeneration of the aging SBS modified bitumen (SMB) is crucial for promoting the achievement of low-carbon development goals. Restoring the structure or performance of the aged SBS is the focus of the present work. Many studies have proved that the high temperature performance of aging SMB is deteriorated by using epoxy-type structural repair agent. Literatures have proved that epoxy-type structural repair agents with benzene ring can make the high temperature performance improve slightly. Therefore, it is necessary to propose a method that can make the high temperature performance improve greatly. In this paper, a rejuvenator containing trimethylol propane triglycidyl ether (TMPTE) combined with vegetable oil (VO) was selected. At the same time, the epoxy structural repair agent containing benzene ring, i.e., E51 epoxy resin (ER) was also selected to compare these two rejuvenators on recovering the comprehensive properties of aging SMB. Through GPC, FM, AFM and TGA tests, ER repair agent has good recovery effect for SBS network structure and adhesion performance for aging SMB. While TMPTE repair agent has good recovery effect for high temperature stability of the aged SMB and molecular weight of the aged SBS. Through DSR and ductility tests, it was found that these two rejuvenators had outstanding recovery for low temperature performance of aging SMB. Through MSCR and soften point tests, it was found that the high temperature performance of the repaired SMB by TMPTE was close to non-aging SMB. This suggests that TMPTE/VO is more effective in restoring the high/low temperature performance of regenerated SMB as a whole. This study can provide guidance for the recovery of comprehensive performance of epoxy-type repair agents regenerated SMB in a cost-effective and environment friendly way.
研究领域:
材料科学
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土木工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yujing Liu,Qi Liu,Xin Zhou,Xiaohui Liu,Mingyue Li,Zhongqiu Liu,Anguo Ying
Improving the voltage window of aqueous supercapacitors beyond 2.5 V without diminishing their capacitance performance is a big challenge to achieve excellent energy density because of the undesirable water decomposition. Herein, this study developed a novel vanadium phosphate (VPO) of the VO(PO 3 ) 2 aerogel as the electrode to enlarge the device voltage, which could effectively raise HER/OER overpotentials and thus achieving a stable wide electrochemical window of −1 ∼ 1 V (vs. SCE) with remarkably improved capacitance. The VPO microstructure is organized by nanowire-stacked lamellar bricks via engineering a controllable phase-transformation using the V-P-citric acid-aerogel as the precursor. Examined as the supercapacitor electrode, in-situ X-ray powder diffraction analysis uncovers that the VO(PO 3 ) 2 undergoes a reversible phase-transformation reaction associated with Na + intercalation/de-intercalation in Na 2 SO 4 and a typical redox pseudocapacitance process in KOH. For the first time, a 2.8 V symmetric aqueous supercapacitor was further assembled with an energy density of 123.1 Wh kg −1 at the power density of 580 W kg −1 , which is much superior to those of all reported V-base supercapacitors. The underlying mechanisms of the VO(PO 3 ) 2 on ultrahigh voltage window and charge storage are further elucidated, which provide the fundamental guidance for structuring VPO-based electrodes used for commercial energy storage devices.
研究领域:
材料科学
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电化学
·
能源存储
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DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2025
·Vol. 23
·期 1
·729
·
IF 12.6
Fu Weicong,Huang Tian,Wang Yi-Xin,Zhao Jing,Shen Jianliang,Yang Qining
Multidrug resistant (MDR) bacterial infections, particularly those involving methicillin-resistant Staphylococcus aureus (MRSA), pose a grave threat to global population health, necessitating novel therapeutic approaches capable of circumventing existing resistance mechanisms. Biomimetic enzymes, which generate bactericidal reactive oxygen species (ROS) by mimicking natural enzyme activity, represent a highly promising solution. This study reports a straightforward one-step synthesis method for vanadium dioxide (VO₂) nanoparticles, which function as potent biomimetic enzymes exhibiting both oxidase-like and peroxidase-like activities. When combined with near-infrared laser irradiation (808 nm, 1 W/cm²) for photothermal therapy (PTT), these VO₂ nanoparticles not only mediate local hyperthermia with a photothermal conversion rate of up to 36.9%, but also significantly enhance ROS generation through biomimetic catalysis. This achieves potent synergistic effects between photothermal therapy and chemodynamic therapy (CDT). This combined therapy exhibits potent antibacterial activity against suspended methicillin-resistant Staphylococcus aureus (MRSA) and effectively disrupts preformed biofilms. Furthermore, in a subcutaneous abscess mouse model, VO₂-mediated PTT-CDT treatment efficiently eradicated bacteria, alleviated local inflammation, promoted tissue repair and angiogenesis. In summary, this readily synthesised VO₂ nanozyme system offers an efficient and translatable therapeutic strategy for tackling challenging multidrug-resistant bacterial infections. Graphical
研究领域:
纳米医学
·
抗菌治疗
·
酶模拟
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光热治疗
·
感染性疾病
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产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2013
·Vol. 42
·期 19
·7051-7058
·
IF 3.806
Chao Huang,Chun-Li Hu,Xiang Xu,Bing-Ping Yang,Jiang-Gao Mao
The synthesis, crystal and band structures and optical characterizations of a new polar thallium(I) vanadyl iodate, namely Tl(VO)2O2(IO3)3, are reported. Tl(VO)2O2(IO3)3 crystallizes in the orthorhombic polar space group Ima2 (No. 46) with a = 14.1143(17), b = 10.2116(12), c = 8.0319(9) Å, V = 1157.6(2) Å3 and Z = 4. The structure of Tl(VO)2O2(IO3)3 exhibits a 1D [(VO)2O2(IO3)3]− chain in which neighboring distorted VO6 octahedra are interconnected by both bridging oxo and iodate anions. The SHG measurements on Tl(VO)2O2(IO3)3, using a 2050 nm laser radiation, showed a moderate strong SHG response of 1.2 × KTP(KTiOPO4). Furthermore, the material is phase-matchable. Theoretical calculations based on DFT methods were performed by using the total-energy code CASTEP.
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DOI
高影响因子
Frontiers in Materials
·
2022
·
IF 3.985
Pei Mengxi,Lv Shangchun,Liu Yishui,Si Zhichun,Wu Xiaodong,Ran Rui,Weng Duan,Kang Feiyu
Photocatalytic removal of organic pollutants under solar irradiation at room temperature is considered an energy-saving technique of environmental remediation. However, photocatalysis is impeded by the poor response to visible light and fast charge recombination. In this work, sub-nano Pt/β-FeOOH quantum dots (QDs) were designed to shorten the charge migration path and obtain wide light harvesting. Interestingly, the crystalline β-FeOOH QDs can be obtained by loading sub-nano Pt particles via a reconstruction mechanism of amorphous FeOOH induced by H2 spillover, which facilitates the fast kinetics of charge transition and benefits the oxygen-rich surface of the catalyst for photocatalytic oxidation reactions. Moreover, the Pt-VO-Fe interfaces were proved to be the most active sites for the activation of O2. As a result, the catalyst exhibits a predominant photocatalytic performance in toluene oxidation, achieving a TOFPt of 0.591 min−1 at room temperature under visible light irradiation. This work provides a new perspective on the design and preparation of nanocatalysts for high-efficient photocatalysis under visible light irradiation.
研究领域:
环境科学
·
催化
·
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）