ChemCatChem
·
2025
·
IF 3.9
Pengwei Deng,Haoran Wu,Huayu Wei,Zixu Yang,Jing Xu,Minghui Zhu
Graphical A modified synthesis method on Cu mesh simplifies and enhances the catalyst preparation process and efficiency at a much lower cost. The synergistic interplay between Co and Cu species is further investigated during the 5-hydroxymethylfurfural oxidation reaction. The Co-doped Cu mesh catalyst's scalability, cost-effectiveness, and robust performance underscore its potential for industrial applications in 5-hydroxymethylfurfural electrooxidation. The growing demand for sustainable alternatives to fossil-derived chemicals has spurred significant interest in biomass valorization, with 5-hydroxymethylfurfural (HMF) emerging as a key platform molecule. In this study, an electrochemical synthesis strategy was employed to synthesize a bimetallic Co-doped Cu mesh catalyst for the HMF oxidation reaction. It exhibited remarkable electrooxidation activity during a 3-h reaction at 1.6 V versus RHE with 83.2% HMF conversion, 99.4% 2,5-furandicarboxylic acid (FDCA) selectivity, and 87.7% Faraday efficiency. X-ray diffraction, in situ surface-enhanced Raman spectroscopy, and X-ray photoelectron spectroscopy revealed that the modified Cu mesh catalyst introduced more Co 3 O 4 species. Additionally, in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy elucidated that Cu species on the Co-doped Cu mesh can adsorb *OH and couple with organic molecules during the reaction process. Cu─Co dual active sites enhance the selective electrochemical oxidation of HMF toward FDCA.
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SYNTHETIC METALS
·
2020
·
IF 3.286
Ke Qu,Yuqi Bai,Xiyan Gao,Miao Deng
Graphite and multiwall carbon nanotube (MWCNT) served as dual dopants to prepare the composite with poly (aniline- co - o -methoxyaniline) copolymer electrochemically. The aniline to o -methoxyaniline monomer feed ratio was screened, with 4 to 1 monomer ratio being optimal. The supercapacitive properties of the prepared dual dopant-doped composite as electrode materials have been investigated and yielded a large specific capacitance of 535.0 F/g under 1.0 A/g current density and showed excellent rate performance, even with large current densities applied (up to 50.0 A/g). The composite remained to give a relatively stable specific capacitance of more than 200.0 F/g after 500 galvanostatic charge-discharge cycles, which afforded better and/or comparable performance compared with other polyaniline-based composite. The composite’s morphological features were characterized with scanning electron microscopy. The results from this study will be significant for the development of conducting polymer-based energy storage materials.
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Russian Journal of Physical Chemistry A
·
2022
·Vol. 96
·期 9
·1925-1934
·
IF 0.791
Zhang Haifu,Lu Xinhuan,Li Xixi,Wang Beibei,Dong Yanhong,Zhou Dan,Xia Qinghua
Abstract The epoxy compounds are useful intermediates and precursors in the production of fine chemicals and drugs. In the epoxidation reaction system, Co-MOF, a kind of cobalt-based heterogeneous catalytic material, has been widely studied for its simple synthesis, stable structure and excellent ability of molecular oxygen activation. For the first time, we used potassium persulfate as the initiator for the efficient air epoxidation reaction catalyzed by Co-MOF materials, which had better catalytic effects than aldehydes or peroxy compounds. As a new initiator, potassium persulfate reduces the reaction temperature and increased the amount of substrate olefins. In addition, potassium persulfate reduced the activation energy of the reaction, so that the ratio of olefin to initiator was further reduced, showing a better efficiency than initiators of aldehydes or peroxy compounds. Moreover, the application of potassium persulfate to the epoxidation reaction of other catalysts has also achieved good results.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hongming Liu,Jingxin Wang,Hai Xiong,Yue Chen,Jianzhong Xiao,Chao Wang
Restricted by an insufficient understanding of the compositional and structural characteristics of the sensing materials that affect the sensing performances, the YSZ-based CO gas sensor remains in a dilemma in terms of further promoting sensitivity, selectivity and long-term stability. In this work, two bimetallic oxides with different crystal structures, perovskite SmMnO 3 and mullite SmMn 2 O 5 , were prepared and adopted to elucidate the roles of the Mn 3+ , Mn 4+ and surface oxygen vacancies . Compared with SmMnO 3 , the coexisting coordination modes of Mn 3+ and Mn 4+ in SmMn 2 O 5 is conducive to generating oxygen vacancies. Furthermore, a SmMn 2 O 5 -based sensor with more oxygen vacancies demonstrates a relatively faster response/recovery speed and enhanced sensitivity of 2.05 times that of SmMnO 3 under the same operation conditions. Such work may broaden insight into the development of efficient sensing materials that introduce oxygen vacancies through the construction of phase structures without complicated operations. Overall, the sensor attached to SmMn 2 O 5 exhibits a low detection limit (5 ppm), a feasible response/recovery speed (24 s/28 s toward 40 ppm CO operating at 450 °C), satisfactory CO selectivity and long-term stability, highlighting its potential for CO monitoring in harsh environments.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chen Cai,Jiayin Chen,Wei Fu,Shuying Ning,Hao Zhou,Muhammad Kashif,Yaxin Su
The Ce-modified OMS-2 catalyst (Ce x -OMS-2) was synthesized by the hydrothermal synthesis method, after which its catalytic efficacy in the selective reduction of NO by CO was assessed. The experiments showed that Ce 0.08 -OMS-2 was capable of 100% NO conversion between 175 and 300 °C when 0.05%NO, 0.1%CO, 5%O 2 and N 2 were used as equilibrium gases, and the N 2 selectivity peaked at 93.2% at 175 °C. Additionally, Ce 0.08 -OMS-2 exhibits good sulfur resistance in the presence of 0.02% SO 2 and maintains more than 88% NO conversion at 175–275 °C. By using BET, XPS, H 2 -TPR, NH 3 -TPD, and In situ DRIFTS to characterize the catalysts, the effects of doping the active metal Ce on the physicochemical characteristics of OMS-2 catalysts were under investigation. In conclusion, the improvement of the low-temperature activity of the Ce x -OMS-2 catalyst is facilitated by lower agglomeration and crystallinity , larger specific surface area, smaller average pore size, enhanced surface oxygen vacancies, increased Mn 4+ concentration, and richer Brønsted acid. Reaction gas adsorbed species and intermediates on the catalyst surface were dynamically captured during In situ DRIFTS experiments. The CO-SCR reaction of the catalyst was found to follow the E-R mechanism below 200 ℃ and the L-H mechanism at 200–350 ℃.
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CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Wanjun Guo,Zhi-Qiang Wang,Shuang Xiang,Yaxuan Jing,Xiaohui Liu,Yong Guo,Xue-Qing Gong,Yanqin Wang
ABSTRACT Owing to the wide application of primary amines, their selective production via reductive amination has become a crucial research topic. Various metal-supported catalysts (Pt, Ru, Rh, Ir, Co, Ni, etc. ) have been investigated, and metallic species have been recognized as active sites in recent years. Herein, we reveal for the first time that CoO species containing oxygen vacancies within a core-shell-structured Co@CoO catalyst accelerate the ammonolysis of Schiff bases, key intermediates in reductive amination, through NH 3 dissociation to hydride-like NH 2 δ – species, delivering an excellent reductive amination performance. The catalyst is highly stable and was utilized in 10 catalytic cycles for the amination of biomass-derived cyclopentanone (CPO) to cyclopentylamine (CPA) without deactivation. Various computational models in combination with spectroscopic measurements indicated that this catalyst not only drives the dissociation of H 2 to the active H δ – species, but also enables the homolytic cleavage of NH 3 to NH 2 δ – . D 2 isotopic tracing experiments provided further evidence of the direct involvement of hydride-like NH 2 δ – species in Schiff base ammonolysis. Theoretical calculations verified the stable co-adsorption of H δ – and NH 2 δ – , which allows the Schiff base to move freely on the surface of the CoO shell and participate extensively in molecular collisions, resulting in exceptional catalytic activity. This is the first study that demonstrates the potential of metal oxide catalysts for the production of primary amines via reductive amination.
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Journal of Biomedical Nanotechnology
·
2021
·Vol. 17
·期 8
·1598-1611
·
IF 4.099
Zhao Dan,Zhang Rui,Xu Mengyu,Xiao Xincai,Zhao Haiyan,Huang Xianju
Multifunctional carbon dots have drawn considerable attention due to their potential biomedical application value. We report the preparation of blue-green fluorescence-emitting, multifunctional, nitrogen-and-sulfur co-doped carbon dots (N, S-CDs) synthesized via a one-step process using
1-thioglycerol as a sulfur source, glucose and citric acid as carbon sources, and polyethyleneimine as a nitrogen source. Because of abundant amino and sulfur content, the CDs exhibited high sensibility and selectivity for detecting Cu2+ (detection limit: 0.01 μM, linear range:
0.025 to 50 μM). Fast and sensitive detection of tiopronin was also achieved on the basis of the fluorescence “off-on” mode considering the strong affinity between tiopronin and Cu2+. The N, S-CDs exhibited good biocompatibility as determined by fluorescence imaging
using onion epidermal cells and gram-positive bacteria. The CDs also exhibited excellent antimicrobial ability against the gram-positive bacteria. Our results indicate that these novel N, S-CDs could be ideal candidates for several biochemical applications such as antibacterial treatment and
detection of small biomolecules.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Wenqi Jiang,Wangjing Zhai,Xueke Liu,Fang Wang,Donghui Liu,Xiangyang Yu,Peng Wang
Antibiotics could enter farmlands through sewage irrigation or manure application, causing combined pollution with pesticides. Antibiotics may affect the environmental fate of pesticides and even increase their bioavailability. In this study, the influence of monensin on the degradation, toxicity, and availability of atrazine in soil-earthworm microcosms was investigated. Monensin inhibited the degradation of atrazine, changed the metabolite patterns in soil, and increased the bioavailability of atrazine in earthworms. Atrazine and monensin had a significant synergistic effect on earthworms in the acute toxic test. In long-term toxicity tests, co-exposure of atrazine and monensin also led to worse effects on earthworms including oxidative stress, energy metabolism disruption, and cocoon production compared to single exposure. The expression of tight junction proteins was down-regulated significantly by monensin, indicating that the intestinal barrier of earthworms was weakened, possibly causing the increased bioavailability of atrazine. The expressions of heat shock protein 70 (Hsp70) and reproductive and ontogenetic factors (ANN, TCTP) were all downregulated in binary exposure, indicating that the resilience and cocoon production of earthworms were further weakened under combined pollution. Monensin disturbed the energy metabolism and weakened the intestinal barrier of earthworms. These results showed that monensin increased the risks of atrazine in agricultural areas.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Chen Ji,Mingyi Yu,Guojun Li,Zheng Lian,Shule Zhang,Liang Jiao
Piperazine (PZ), as a carbon dioxide (CO 2 ) absorbent with outstanding properties, has been extensively studied on modification and the application as a promoter. However, it is still unclear as to why PZ possesses such excellent properties at present. In this work, we returned to the fundamentals by focusing on PZ and N , N ′-Dimethylethylenediamine (DMEN) as research subjects. Through experimental and computational investigations, we examined the influence of six-membered ring structures on the CO 2 capture performance of PZ. The results of absorption test indicate that the ring structure can reduce the activation energy of the adsorption reaction and increase the cycle capacity, but it also lowers the adsorption rate and reduces the maximum capacity. To further investigate the influence of the ring structure on the absorption process, quantitative 13 C NMR analysis and density functional theory (DFT) calculation were employed. The results indicated that the ring structure enhances steric hindrance effect, thereby promoting bicarbonate formation and improving regeneration performance. This research provides valuable insights for the further development of highly efficient CO 2 capture absorbents based on PZ.
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MATERIALS SCIENCE FORUM
·
2015
·
IF 0
Gang Chen,Chun Wei Gong,Chun Lin Fu,Xiao Dong Peng,Wei Cai,Rong Li Gao,Xiao Ling Deng
(Sr1-xBax) 2(Nb0.9Ta0.1) 2O7 (SBNT) ceramics were prepared by solid state reaction. The crystal structure of SBNT ceramics, surface morphology and dielectric properties were studied using XRD, SEM and LCR instrument analyzer, respectively. The results show that the grain size decreases with increasing Ba concentration, and all samples show single phase, no second phase can been observed. Addition of Ba ion can improve the dielectric properties of SBN ceramics. The dielectric constant increases first, then decreases; the maximum value (εr=97) can be obtained at x=0.1, the dielectric constant changes slightly with increasing wide frequency.
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CRYSTAL GROWTH & DESIGN
·
2014
·
IF 4.558
Linglei Jiang,Ying Huang,Qi Zhang,Hongyan He,Yun Xu,Xuefeng Mei
Pharmaceutical co-crystals involving two active pharmaceutical ingredients are rarely revealed in the literature. In this work, crystal engineering principles were exercised to guide the design and synthesis of the Biopharmaceutics Classification System class IV drug dapsone (DAP). We reported six drug–drug co-crystals of DAP with sulfanilamide, flavone, luteolin, caffeine in 1:1 stoichiometry, caffeine in 1:2 stoichiometry, and 2(3H)-benzothiazolone. Bioactive coformers were deliberately selected. The resulting co-crystals were fully characterized by a range of analytical technologies, including X-ray powder diffraction, Fourier transform infrared spectroscopy, polarized light microscopy, differential scanning calorimetry, and thermogravimetric analysis, etc. Single-crystal structure analysis reveals that reoccurring supramolecular synthons are observed in different DAP co-crystals. Equilibrium solubility and intrinsic dissolution rates were also compared with those of the parent drug. This work expands the pharmaceutically acceptable solid forms of DAP and supplements the successful cases of drug–drug co-crystals.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Ting Zhao,Kaiquan He,Xingyi Hu,Pu Hu,Chaoqun Shang
Li S battery suffers from polysulfides' shuttle effect and unsatisfactory redox kinetics. To tackle these issues, we design a multi-functional interlayer based on heterogeneous Mo 2 C/Co confided by N-doped porous carbon (Mo 2 C/Co@NC) via one-step controlled pyrolysis of Co 2+ /MoO 4 2− /2-methylimidazole. The heterogeneous Mo 2 C/Co as active centers effectively immobilizes polysulfides and accelerates their redox transformation kinetics. Moreover, the hierarchical porous NC matrix guarantees rapid electron/ion transport. Acting as an interlayer, the electrochemical evaluation demonstrates desirable performance. Specifically, a high initial discharge capacity of 874.0 mAh g −1 is achieved at 3C, which retains 373.3 mAh g −1 after 1000 cycles (capacity fading rate: 0.057 %/cycle), significantly outperforming battery without interlayer (0.082 %). This work demonstrates an effective heterointerface engineering strategy for the development of Li S battery practical application.
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高影响因子
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