CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3174-3183
·
IF 2.3
Xia Qing,Qin Haijian,Xia Feifei,Yao Pengfei,Zheng Chunzhi,Zhao Songjian,Zhang Huabing,Yang Fengli
CO oxidation at mild condition is significant for industrial process but still challenging nowadays, especially for the non-noble metal catalysts. The preparation method significant affect the catalytic activity of the catalyst. Comparing with cobalt supported on tantalum oxide prepared by impregnation method, Co/Ta 2 O 5 prepared by deposition–precipitation method with urea in this study has smaller particle size, higher specific surface area and better redox properties, and these features make the catalyst exhibit higher catalytic activity for CO oxidation at mild condition. 90% CO conversion was achieved at 130 ℃, and CO was fully converted at 150 ℃. The XPS and DRIFTs results show that Co/Ta 2 O 5 has more oxygen vacancies, and the absorbed CO will react with oxygen. The study may provide a new thought for the preparation of catalysts with high activity at mild condition. Graphical
Co/Ta 2 O 5 prepared by deposition–precipitation with urea catalyzes the oxidation of CO
研究领域:
催化
·
材料科学
·
环境化学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYHEDRON
·
2025
·
IF 2.6
Keliang Wan,Lifeng Tan
Double-stranded RNA determines and regulates many biological processes in cells, plays a vital role in cell information transmission and gene regulation, and is a key target for the treatment of certain diseases. Here, we synthesized and characterized two novel ruthenium(II) complexes [Ru(phen) 2 ( o -CNPIP)] 2+ (Ru 1 ) and [Ru(phen) 2 ( o -CH 3 PIP)] 2+ (Ru 2 , phen = 1,10-phenanthroline, o -CNPIP = (2-(4-cyanodipyrido)-imidazo-[4,5- f ][1,10]-phenanthroline, o -CH 3 PIP = 2-(4-methyl)-imidazo-[4,5- f ][1,10]-phenanthroline). The interaction of the two Ru (II) complexes with double-stranded RNA poly(rA)•poly(rU) under dilute solution and molecular crowding conditions was studied by various spectroscopic methods and viscosity measurements. The results of UV–vis absorption spectroscopy and steady-state emission spectroscopy studies show that Ru 1 showed stronger binding and stabilizing ability to poly(rA)•poly(rU) and the binding affinity of Ru 1 and Ru 2 to poly(rA)•poly(rU) was weakened under molecular crowding conditions. Subsequently, the results of circular dichroism spectroscopy studies, thermal denaturation measurements and viscosity measurements also confirmed the results of our UV–vis absorption spectroscopy and steady-state emission spectroscopy studies. The results also showed that the two Ru(II) complexes bind, stabilize and perturb the structure of poly(rA)•poly(rU) by intercalation under dilute solution and molecular crowding conditions. In addition, it was found that the strength of these abilities was closely related to the binding affinity of the Ru(II) complexes to poly(rA)•poly(rU) by comparing the results of these studies. Furthermore, the thermodynamic parameters for the binding of Ru(II) complexes to poly(rA)•poly(rU) under the two conditions indicate that the binding process is spontaneous, is an enthalpy-driven process, and that hydrogen bonding serves as the dominant force. The purpose of this work is to explore the substituent effect of Ru(II) complexes and the effect of solution environment on the ability of Ru(II) complexes to bind and stabilize poly(rA)•poly(rU). Some insights resulting from this work are expected to facilitate the design of highly selective double-stranded RNA binders based on Ru(II) complexes. Interestingly, the phosphorescence intensity of Ru 2 after binding to poly(rA)•poly(rU) is significantly higher than that of Ru 1 under both solution conditions, with even stronger phosphorescence emission observed under molecular crowding conditions. This indicates that Ru 2 possesses the potential to serve as a nucleic acid luminescent probe for nucleic acid imaging in biological cells. To enhance its luminescent properties and specific binding capacity, further structural modification of Ru 2 is essential, which will be one of the key focuses of our future research efforts.
研究领域:
无机化学
·
生物无机化学
·
核酸化学
·
分子光谱学
·
生物物理化学
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Yuchuan Ren,Zhanwei Xu,Ying Wang,Fanyu Lu,Yaze Zhao,Kai Yao,Hao Fu,Hao Luo
Applications of sodium ion batteries (SIBs) are inseparable from scalable anode materials with high electrical conductivity and excellent stability. In this work, coal tar pitch activated carbon was functionalized (FAC) and employed as a substrate, followed by a hydrothermal process to fabricate MoS 2 /FAC nanocomposite with tight bonding. The MoS 2 exhibits a homogeneous integrated structure with an enlarged interlayer spacing of 0.65 nm in the obtained MoS 2 /FAC. When employed as anode material for SIBs, the MoS 2 /FAC electrode delivers a promising reversible capacity of 174.0 mAh g −1 at 2 A g −1 , with a decay rate of 0.148%·cycle −1 after 500 cycles. The ultrahigh rate of sodium storage is mainly attributed to uniform MoS 2 nanosheets anchored on the FAC through C-O-Mo bonding, and the wide layer spacing of the ultrathin MoS 2 nanosheets.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2016
·Vol. 8
·期 11
·1929-1936
·
IF 4.724
Bin Chen,Bin Zhang,Yibo Zhang,Xiangguang Yang
Graphical Save it for a Raney day : A series of Ag-modified Ni catalysts is prepared, and the role of bimetallic effects on the selective cleavage of C−O and C−C bonds is investigated in glycerol hydrogenolysis, a model reaction for the utilization of biomass-derived polyols. Compared to Raney Ni, the optimal Raney Ni 6 Ag catalyst is more active in glycerol conversion and efficient for C−O bond cleavage to afford a higher selectivity toward C 3 products. A series of Ag-modified Ni catalysts was prepared, and the role of bimetallic effects on the selective cleavage of C−O and C−C bonds was investigated in glycerol hydrogenolysis, a model reaction for the utilization of biomass-derived polyols. Compared to Raney Ni, the optimal Raney Ni 6 Ag catalyst was more active in glycerol conversion and efficient for C−O bond cleavage to afford a higher selectivity toward C 3 products (1,2-propanediol and lactic acid; 88 %) at the same ∼70 % conversion of glycerol, especially 1,2-propanediol (73 %). On Ni catalysts, the hydrogenation of adsorbed species was the most likely rate-limiting step in glycerol hydrogenolysis under alkaline conditions. The Ag additive enhanced the hydrogenation ability of Ni catalysts, which should be related to the higher strength of the adsorption of hydrogen and the lower strength of the adsorption of substrates on Ni sites because of the formation of Ni-Ag alloys. A mechanistic interpretation was presented for the excellent catalytic behavior.
研究领域:
催化化学
·
生物质利用
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
·
2022
·
IF 4.514
Jianqiao Yang,Shuzhong Wang,Jiahuan Wang,Jinlong Wang,Baoquan Zhang,Lu Liu,Wei Liu,Yanhui Li,Donghai Xu
In this study, the erosion-corrosion experiment of Ni based alloys in high-temperature and high-pressure supercritical water environment was performed. SiO 2 and Al 2 O 3 particles with the average diameter of 30 µm and 50 µm were used as erodent. The special designed specimens were fixed on a blade impeller , and the erosion tests were performed in a high pressure autoclave with a magnetic stirrer system. Results show that the basic corrosion mechanism is not changed by the erosion process. A Cr-rich inner oxide layer and a Fe/Ni rich outer oxide layer were formed on the alloy surface. However, the oxidation rates of the alloys were affected by the erosion process. Parts of the outer Fe and Ni oxides were removed by the erodent particles during the tests. The inner Cr oxide layer still exists owing to the self-healing ability of the Cr 2 O 3 layer, acting as a barrier to resist further corrosion of the alloys. The factors that affect the degree of erosion and the erosion-corrosion mechanism in SCW environment is analyzed.
研究领域:
材料科学
·
腐蚀科学
·
高温高压环境材料行为
·
表面工程
·
能源材料
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 2
·482-491
·
IF 3.117
Lin-Hui Wu,Shu-Li Yao,Jing Li,Hui Xu,Teng-Fei Zheng,Sui-Jun Liu,Jing-Lin Chen,He-Rui Wen
A novel luminescent CdII-based metal–organic framework {[Cd(BBIP)(TBIP)]·EtOH}n (1) derived from the multidentate 5-tert-butylisophthalic acid (H2TBIP) and the semi-rigid N-donor 3,5-bis(benzimidazol-1-yl)pyridine (BBIP) has been solvothermally synthesized and structurally characterized by using infrared spectroscopy, thermal analysis, single-crystal X-ray diffraction and powder X-ray diffraction. The adjacent CdII ions are linked by two carboxylate groups of one TBIP2− ligand with chelating mode to form a one-dimensional CdII-TBIP2− chain, which is further connected by the BBIP ligand to obtain a two-dimensional network. Interestingly, the fluorescence experiments indicate that 1 could be considered as a good multi-responsive sensing material for detecting Fe3+, MnO4−, Cr2O72−, salicylaldehyde (SA) and ethylenediamine (EDA) via the turn-off effect, with the detection limits of 0.53, 0.98, 3.6, 0.42 and 5.3 ppm, respectively. The luminescence quenching effect induced by Fe3+ could be mainly ascribed to the competitive absorption mechanism. The electron-transfer transition and competitive absorption mechanism could be used to explain the luminescence quenching of MnO4− and Cr2O72−. The turn-off effect of 1 on SA could be ascribed to the photoinduced electron-transfer and competitive absorption mechanisms. Meanwhile, the possible mechanism of fluorescence quenching caused by EDA could be attributed to the structure collapse. More importantly, 1 could be regenerated and reused after five cycles for Fe3+, MnO4−, Cr2O72− and SA detection. In a nutshell, 1 could be employed as a multi-responsive luminescent sensor used for the highly selective and sensitive detection of metal ions, anions and small organic molecules.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Puhong Wen,Lili Ai,Taotao Liu,Dengwei Hu,Fangyi Yao
The regular orthorhombic Nb 2 O 5 (O-Nb 2 O 5 ) rectangle nanosheets dominantly exposed (010) facet are synthesized by a hydrothermal topological reaction with a precursor of K 4 Nb 6 O 17 ·4.5H 2 O (KNbO). The structure and morphology of the samples obtained at different temperatures and pH values of reacting solution are investigated. The results suggest that there are two topological reactions in this process. One is the acid-exchanging reaction transforming into H 4 Nb 6 O 17 ·3H 2 O (HNbO) nanosheets from KNbO rectangle nanosheets , and the other is dehydration reaction transforming into O-Nb 2 O 5 rectangle nanosheets from HNbO nanosheets. And the {010} facets of O-Nb 2 O 5 crystal are transformed from the {010} facets of HNbO crystal in the ingenious topological reaction. The photoelectric performance of the obtained O-Nb 2 O 5 nanosheets is evaluated by decomposing water to H 2 under 370 nm UV light illumination and measuring the accompanying photocurrent . The photocurrent density is 680 nA·cm − 2 generated by splitting water with O-Nb 2 O 5 nanosheets as photocatalyst , and it is 4.3 times of the contrast sample. The result indicates that the (010) facet of O-Nb 2 O 5 is one of the highest photocatalytic active surfaces and shows high photoelectric conversion efficiency. Thus, the O-Nb 2 O 5 nanosheets dominantly exposed (010) facet have potential applications in photocatalyst and photoelectric nanodevices .
研究领域:
材料科学
·
光催化
·
纳米材料
·
无机化学
·
能源材料
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Hanqing Wu,Linlu Zheng,Liangbin Lin,Hongyu Guo,Fafu Yang
Fluorescent sensors had been extensively applied on sensing various biomolecules effectively, but no fluorescent sensor for oleanolic acid was presented up to now. In this work, the first fluorescent sensor for oleanolic acid was designed and synthesized based on o-phenyl-bridged bis-tetraphenylimidazole ( PTPI ). PTPI was prepared by bridging two tetraphenylimidazole units and o-phenylenediamine via Schiff-base condensation in yield of 86%. PTPI showed high sensing selectivity for oleanolic acid among 26 biomolecules and ions. The blue fluorescence at 482 nm was enhanced by 4.5 times after sensing oleanolic acid in aqueous media. The fluorescence sensing ability of PTPI for oleanolic acid maintained stable in pH = 5–9. The detecting limitation was as low as 0.032 μM. The detecting mechanism was clarified as 1:1 binding stoichiometry by fluorescence Job’s plot, mass spectrometry, 1 H nuclear magnetic resonance and fourier transform infrared spectroscopy. The detecting ability of PTPI for oleanolic acid was successfully used for paper test and real samples of grapes and Kuding tea with recoveries in the range of 96.0%-106.0%, indicating the good application potential for on-site detecting oleanolic acid in real samples of fruits and food.
研究领域:
分析化学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Shumeng Wu,Caixia Feng,Bingbing Fan,Yonghong Li,He Wang,Yanmei Zhou
Heteroatoms-doped hierarchical porous carbons have attracted considerable interest owing to their efficient utility in supercapacitors . However, the increase of defects tends to sacrifice the electrical conductivity of carbon materials. Therefore, it is of great significance to build a good conductive network by increasing the graphitization degree of porous carbons . Here, this study reports the use of serine phosphate protic salt ([Seri][H 2 PO 4 ]), Pluronic F127 and cobalt nitrate to engineer the N/O/P co-doped hierarchical porous graphitic carbon materials. The Co 2+ catalyzes the graphitization of porous carbons under high temperature. A large number of mesopores, highly doped heteroatoms (O: 4.2 wt%, N: 4.07 wt%, P: 0.81 wt%) and conductive carbon skeleton boost the ultrafast transport of electrons and ions, resulting in high specific capacitance, wide operating voltage and outstanding rate performance. The symmetric supercapacitor assembled in KOH electrolyte shows good frequency response with the scan rate up to 1.5 V s −1 on the working voltage of 0–1.3 V. At the same time, when the power density reaches up to 21.3 kW kg −1 , its energy density remains 8.74 W h kg −1 . Furthermore, the symmetric supercapacitor delivers a high energy density of 81.42 W h kg −1 at the power density of 875 W kg −1 with an ultrahigh working voltage of 3.5 V in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF 4 ) electrolyte. More promisingly, all-solid device based on the optimized sample exhibits outstanding flexibility, which greatly broadens its practicability. This work marks the importance of the balance between porous structure, heteroatom doping and high conductivity for advanced supercapacitors .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
SYNTHESIS-STUTTGART
·
2020
·Vol. 53
·期 07
·1341-1348
·
IF 2.675
Xinxin Zhao,Lin Guo,Chao Yang,Wujiong Xia
A highly regioselective [3+2] cyclization of alkenes with 2-iodoanilines under the irradiation of UV light is described. This general, metal-free strategy facilitates the direct preparation of 2-mono-/disubstituted indolines as well as spiroindolines through alkene carboamination in one step. Mechanistic studies suggested that the photochemical protocol proceeded via a radical pathway.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 193
·期 1
·32
·
IF 5.3
Shi Xiao-Jie,Wang Yue,Wang Lin,Zhang Ting-Ting,Song Tian-Shun,Li Xiang-Ling,Xie Jing-Jing
Electrochemiluminescence (ECL) based on the luminol-O 2 system is attractive for biosensing, yet its efficiency under neutral conditions remains extremely limited due to the poor reactivity of dissolved oxygen. Herein, we develop a phosphorus-doped cerium single-atom catalyst (Ce-N/P-C SAC) that significantly enhances luminol-O 2 ECL in neutral media. The introduction of P atoms effectively modulates the electronic structure of Ce sites, promotes the Ce 3+ /Ce 4+ redox cycle, and accelerates the one-electron oxygen reduction reaction to generate abundant ·O 2 ⁻, leading to a 12.73-fold ECL enhancement compared with the bare electrode and a 2.13-fold increase over undoped Ce-N-C. Based on these catalytic properties, a highly sensitive ECL platform was constructed for the detection of gallic acid, achieving a wide linear range (10 nM − 10 µM) and a low detection limit of 7.42 nM. This work provides an efficient strategy for boosting neutral-pH luminol-O 2 ECL and demonstrates the practical potential of rare-earth single-atom catalysts in antioxidant determination and bioanalytical sensing.
Section
Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FEBS LETTERS
·
2016
·Vol. 590
·期 16
·2619-2628
·
IF 3.519
Yu-Ying Zhang,Rui-Xue Xu,Shuai Gao,Ai-Xia Cheng
Oroxylin A and hispidulin, compounds which are abundant in both Scutellaria and liverwort species, are important lead compounds for the treatment of ischemic cerebrovascular disease. Their enzymatic synthesis requires an O -methyltransferase able to interact with the related flavonoid's 6-OH group, but such an enzyme has yet to be identified in plants. Here, the gene encoding an O -methyltransferase (designated PaF6OMT) was isolated from the liverwort species Plagiochasma appendiculatum . A test of alternative substrates revealed that its strongest preferences were baicalein and scutellarein, which were converted into, respectively, oroxylin A and hispidulin. Allowed a sufficient reaction time, the conversion rate of these two substrates was, respectively, 90% and 100%. PaF6OMT offers an enzymatic route to the synthesis of oroxylin A and hispidulin.
研究领域:
植物学
·
生物化学
·
药理学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）