TETRAHEDRON
·
2024
·
IF 2.1
Nan Wang,Yuanyuan Huang,Mengke Wang,Weichun Huang,You Zi
Herein, a new approach for the synthesis of ( Z )- N -alkenyl-2-pyridones from 2-pyridones and propiolates using phosphine catalysis under mild conditions is reported. This dual Z -diastereoselective and N -selective reaction demonstrates excellent selectivity, yielding sole ( Z )- N -alkenyl-2-pyridones. Furthermore, scale-up studies confirm its practical applicability, with consistent efficiencies observed.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jingru Zhang,Guangxin Yang,Junyu Zhang,Cong Kong,Jun Wang
The misuse of sulfonamide and fluoroquinolone antibiotics leads to pollution of the water environment, necessitating the development of cost-effective and efficient degradation methods. This article presents a one-step hydrothermal method (200℃, 8 h) for the preparation of Fe-N-co-doped biochar/carbon quantum dots (Fe/N/BC/CQDs) as a photocatalytic material. The Fe/N/BC/CQDs was employed for the activation of H 2 O and O 2 , facilitating the degradation of sulfonamide and fluoroquinolone antibiotics, with superoxide radicals, photo-generated holes, hydroxyl radicals, and singlet oxygen dominated the photodegradation process. Under 1 h dark and 8 h natural light conditions, the degradation efficiency of norfloxacin, sulfathiazole, sulfamethoxazole, sulfamonomethoxine, sulfadoxin, sulfamethazine (10 mg/L) by Fe/N/BC/CQDs ranged from 74.21 % to 89.23 %. The potential degradation pathways of sulfonamide and fluoroquinolone antibiotics were proposed based on ultrahigh-performance liquid chromatography tandem high-resolution mass spectrometry analysis of the intermediates. The Fe-N-doped biochar’s hierarchical pore structure enhances synergistic adsorption-catalysis effects, while the incorporated carbon quantum dots (CQDs) broaden solar spectrum utilization, effectively overcoming the high-intensity light dependency common to conventional photocatalysts. Efficient charge separation was achieved through the formation of a p-n heterojunction between Fe-N-co-doped biochar and CQDs. Additionally, the applicability of Fe/N/BC/CQDs in real water systems was confirmed, providing valuable insights for the construction of p-n heterojunction structures to degrade organic pollutants in water.
研究领域:
环境科学
·
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shuaishuai Li,Xudun Shen,Bowang Zhao,Longnian Tang,Yechen Qian,Wenyao Li,Shijie Li
Aqueous sodium-ion batteries (ASIBs) are promising for large-scale electrical energy storage (LSEES) applications due to their cost and safety advantages. However, the low voltage stabilization window of water (∼1.23 V) and the lack of cathode with high specific capacity and long cycle life have limited their development. Cobalt-based Prussian blue analogues (NaCoPBAs) have the advantage of high theoretical specific capacity but short cycle life. Recently, the molecular crowding electrolyte (MCE) strategy has been proposed to improve the electrolyte voltage stability window (ESW) of electrolytes, in this work, we report an improved xMC (x: ratio, MC: molecular crowding agent) electrolyte that uses N–N dimethylacetamide (DMAC) as the molecular crowding agent and NaOTf as the advanced salt with an ESW of 2.65 V and excellent nonflammability. The side reactions of the NaCoPBA//Hard Carbon (HC) full-cell active material are improved with the aid of the electrolyte. Capacity retention of 75 % after 600 cycles with excellent cycling stability. These results demonstrate that this advanced MCE strategy can be utilized for practical applications designed for safety, high specific capacity and long cycle (ASIB).
研究领域:
储能技术
·
电化学
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材料科学
·
电池技术
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Yan Runhan,Cui Hongmin,Shi Jinsong,Yan Nanfu,Weng Yaqing,Cheng Ting,Wang Wei
There are still challenges in the recovery of rare earth elements (REEs) from leaching liquor of ion-adsorption type rare earth ore. In this paper, unsaponified N, N-di(2-ethylhexyl)-diglycolamic acid (HDEHDGA) was used to develop a green extraction process for efficient separation and enrichment of REEs. The cation exchange mechanism of RE(III) extraction was proposed by slope analysis and FT-IR spectra. HDEHDGA exhibited excellent extraction performances, such as short equilibrium time, high selectivity towards RE(III) and easy stripping by 0.5 mol/L HCl solution. REEs was enriched from 287.5 mg/L to 63.30 g/L by five-stage counter-current extraction and three-stage counter-current stripping using unsaponified HDEHDGA. The enrichment factor reached 220, and the proportion of REEs was increased from 80.76 wt% to 98.82 %. The loss of REEs was controlled below 2.14 wt%. This extraction strategy helps to improve the REEs recovery and avoid ammonia–nitrogen wastewater, which demonstrates its application potential in the ion-adsorption type rare earth ore.
研究领域:
化学工程
·
冶金工程
·
环境科学
✓ 已验证
DOI
高影响因子
GLYCOCONJUGATE JOURNAL
·
2018
·Vol. 35
·期 4
·411-420
·
IF 2.548
Wang Chengjian,Yang Meifang,Gao Xi,Li Cheng,Zou Zihua,Han Jianli,Huang Linjuan,Wang Zhongfu
Despite the great significance of release and analysis of glycans from glycoproteins, the existing N -glycan release methods are undermined by some limitations and deficiencies. The traditional enzymatic protocols feature high N -glycan release specificity but are generally costly and inefficient for some types of N -glycans. The existing chemical methods require harsh reaction conditions or are accompanied by the remarkable formation of by-products. Herein, we describe a versatile chemical method for the release and analysis of N -glycans from glycoproteins. This method differs from the existing methods as only aqueous ammonia is used to catalyze the N -glycan release reactions. Optimization of reaction conditions was performed using RNase B as a model glycoprotein and the obtained results indicated a highest N -glycan yield in ammonia at 60 °C for 16 h. Comparison of this method with traditional enzymatic protocols and recently reported NaClO methods confirmed the good reliability and efficiency of the novel approach. We also successfully applied this method to some complex biological samples, such as Ginkgo seed protein, fetal bovine serum (FBS) and hen egg white, and demonstrated its great compatibility with various neutral N -glycans, core α-1,3-fucosylated N -glycans and sialylated N -glycans. This method is very simple and cost-effective, enabling convenient analysis and large-scale preparation of released reducing N- glycans from various biological samples for structural and functional glycomics studies.
研究领域:
生物化学
·
分子生物学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Jing Huang,Jiang Peng,Junqing Zeng,Liping Zheng,Huajie Chen
Despite the important advances on B/N co-doped porous carbons (BNCs), integrating high B/N-doping content and hierarchical porosity into carbon nanosheets remains a challenging task for supercapacitor application. Herein, we report a novel BNC nanosheet with both expected properties through one-step H 3 BO 3 -mediated carbonization/activation of a newly-developed N/O-rich polymer (DPP). In such a mixture system, an in-suit crossing-linked DPP@H 3 BO 3 composite is formed due to the formation of multiple intermolecular hydrogen bonds between the H 3 BO 3 and the ester groups of DPP. The improved thermal stability for such a composite enables the fixation of more B-/N-bearing species in the carbon skeleton during carbonization. Particularly the nanosheet-like BNC-850 shows a rather high B/N content (6.63/7.27 at.%), a large S BET value (766.5 m 2 g −1 ), and a hierarchical porosity, all of which are in favor of electrochemical performance in both aqueous supercapacitors and zinc-ion capacitors (ZICs). In 6 M KOH electrolyte, the BNC-850 electrodes deliver an impressive capacitance of 341.5 F g −1 at 0.5 A g −1 , a high capacitance retention of 79.2 % at 20 A g −1 , and a good cycling stability (95 % capacitance retention over 10,000 cycles at 5 A g −1 ). The energy density of BNC-850-based ZICs is as high as 126.0 Wh kg −1 at 459.0 W kg −1 , exhibiting an outstanding superiority compared to the reported carbon-based ZICs. This work offers a facile strategy for accessing BNCs with high B/N-doping contents, and highlights the importance of such materials in high-energy-density ZICs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jing Zhang,Zishuo Fang,Heng Dong,Yu Liu,Zhenyu Chu,Yongbin Mou,Wanqin Jin
In clinical settings, saliva has been established as a straightforward, noninvasive medium for diagnosing periodontitis. However, the precise diagnosis is often hampered by the absence of a specialized analyzer capable of detecting low concentrations of biomarkers typically found in saliva. In this study, we present a noninvasive, on-site screen-printed biomicrochip specifically engineered for the precise and sensitive quantification of lactate concentrations in saliva, a critical biomarker in the diagnosis of periodontitis. The microchip is constructed using a nanostructured ink formulation that includes MnFe@N-doped carbon nanotubes (MnFe@N-CNTs). These MnFe@N-CNTs exhibit a high degree of graphitization and low electrical resistance, significantly augmenting the electrocatalytic efficiency of the enzymatic reaction of lactate. This results in doubled sensitivity and a detection limit that surpasses those of the current advanced salivary assay methods. Remarkably, within just 30 s, the biomicrochip can quantitatively and precisely measure lactate concentrations in the saliva of 10 patients, which provides valuable insights into the severity of their periodontitis. This biosensor holds excellent potential for large-scale production and could broaden the scope of biomarker recognition, paving the way for the analysis of a wider range of oral diseases.
研究领域:
生物医学工程
·
临床诊断
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
C-Journal of Carbon Research
·
2024
·Vol. 10
·期 3
·62
·
IF 3.9
Xuexin Yuan,Qiqi Zhou,Yu Chen,Hai-Jian Yang,Qingqing Jiang,Juncheng Hu,Cun-Yue Guo
In the present work, inexpensive and commercially available diethyltriamine pentaacetic acid (DTPA) was used as an initiator to catalyze the N-formylation reaction of CO2with amines via the construction of C-N bonds in the presence of xanthone as the photosensitizer and PhSiH3as the reducing agent. After a systematic study of various factors, the optimal conditions for the photocatalytic reaction were obtained: 2.5 mmol of amine, 2.5 mmol of PhSiH3, 10 mol% of DTPA, 20 mol% of xanthone, 1 mL of dimethylsulfoxide (DMSO), atmospheric pressure, and 35 W UV lamp irradiation for 48 h. Under the optimal conditions, the catalyst system afforded high performance for the N-formylation of amines (primary and secondary amines) and CO2, and the yields of the N-formylated products of dialkylamines were above 70%. Further studies exhibit that the catalytic system has a wide scope of substrate applications. For various alicyclic secondary amines, heterocyclic secondary amines, aliphatic primary amines, and aromatic primary amines, the corresponding N-formylation products can be obtained efficiently. In addition, the catalyst can be recycled by simple precipitation and filtration. After five cycles of recycling, there was no significant change in the catalytic and structural properties of DTPA. Finally, a possible reaction mechanism is proposed.
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Wei-Guang Chen,Nan Hu,Yu Chen,Hong Pan
Multifunctional branched polylactides (BPLAs) with N,N -bis(2-hydroxyethyl)glycine (BHEG) as branching units were prepared. The as-prepared BPLAs had degree of branching in the range of 5.7–9.1%, number-average molecular weight in the range of 7.4 kDa–9.3 kDa, and dispersity in the range of 1.3–1.7. The tertiary amine groups of BHEG units endowed BPLAs intrinsic photoluminescence (PL) nature with quantum yield (QY) in the range of 1.2–2.0% under the maximum excitation wavelength of 360–370 nm and the maximum emission wavelength of 439–445 nm. Oxidized BPLAs showed the maximum excitation wavelength of ca. 473 nm as well as the maximum emission wavelength of ca. 540 nm, and much higher QYs of 9.1–10.5%. The tertiary amine groups of BHEG units also endowed BPLAs guest-encapsulation capacity. The obtained BPLAs were effective multifunctional additives for poly( l -lactide) plastics, embodied with improved crystallization and mechanical properties , PL property and new functions through hosting functional guest molecules.
研究领域:
高分子科学
·
材料科学
·
化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2015
·Vol. 11
·期 14
·2885-2892
·
IF 4.029
Dashuang Fan,Peizhu Zheng,Yuanming Ma,Tianxiang Yin,Jihua Zhao,Weiguo Shen
The concentration-dependent enthalpies of mixing for water/sodium bis(2-ethylhexyl)-sulfosuccinate (AOT)/n-alkane microemulsions with different water contents ω0 and chain lengths n of n-alkane were determined by isothermal titration microcalorimetry (ITC) and flow-mixing microcalorimetry at 298.15 K and used to calculate the interaction enthalpies (−ΔHC) between the droplets. It was found that −ΔHC increased with ω0, and changed from negative to positive at about ω0 = 10. The investigation of the dependence of −ΔHC on n revealed that the values of −ΔHC were negative and had a minimum for ω0 = 5; while they were positive and had a maximum for ω0 = 15. These phenomena were discussed based on the competition of the overlapping contribution of the surfactant tails between two neighbouring droplets and the penetration contribution of the solvent molecules into the surfactant tails. These results indicated the important role of entropy in the stability of the microemulsion systems.
研究领域:
化学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 7
·1-12
·
IF 2.278
Zhao Lianhong,Yan Xiufang,Jie Zhiqiang,Yang Hong,Yang Shiping,Liang Jie
Regenerable antimicrobial N -halamine/silica hybrid nanoparticles (NPs) containing chlorinated 5,5-dimethylhydantoinyl (Cl-DMH) groups, Cl-DMH/SiO 2 hybrid NPs, have been prepared by a co-condensation reaction between N -(3-triethoxysilylpropyl)-5,5-dimethylhydantoin (TS-DMH) and tetraethoxysilane (TEOS) and then a chlorination reaction in NaClO solution. The as-synthesized Cl-DMH/SiO 2 NPs were characterized by transmission electron microscopy, Scanning electron microscopy, X-ray photoelectron spectra, Specific surface area, Differential scanning calorimetry, and Fourier transform infrared. Experimental results showed that the size of the as-synthesized Cl-DMH/SiO 2 NPs could be well adjusted by changing the mass ratio of TS-DMH/TEOS and the volume ratio of 28 % NH 4 OH/H 2 O. Antimicrobial tests showed that the as-prepared Cl-DMH/SiO 2 hybrid NPs had excellent antimicrobial activities against both Escherichia coli and Staphylococcus aureus . The minimum inhibitory concentration and minimum bactericidal concentration values of the as-prepared Cl-DMH/SiO 2 hybrid NPs are 15 and 20 μg/mL for S. aureus , 25 and 30 μg/mL for E. coli , respectively. Paper disk diffusion assay showed that smaller-sized Cl-DMH/SiO 2 hybrid NPs have bigger inhibition zone diameters, indicating stronger antimicrobial efficacies. Also, the storage stability and regenerability of Cl-DMH/SiO 2 hybrid NPs were investigated.
研究领域:
材料科学
·
微生物学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
Pan Zhang,Yanxi Ji,Wenya Li,Lihua Xu,Lemeng Wang,Dong Fu
The viscosities of N -(2-aminoethyl)ethanolamine (AEEA), 1,4-butanediamine (BDA) and N-methyl- 1,3-propane- diamine (MAPA) activated 2- diethylaminoethanol (DEAE) aqueous solutions were measured at temperatures ( T ) from 303.2 K to 323.2 K, respectively. The DEAE mass fractions ( w DEAE ) and the other three amines ( w AEEA / w BDA / w MAPA ) are 0.300 to 0.500 and 0.050 to 0.150 respectively. The Weiland equation was used to calculate the viscosity of these three solutions, and the calculation results were satisfied with data of the experimental results. With the aid of experimentally determined viscosity data, the activation energy ( E a) of these three solutions was predicted through the Arrhenius formula. With the help of the viscosity data and the diffusion coefficient model of CO 2 in water, the CO 2 diffusion coefficient ( D CO2 ) in these three solutions was calculated. The quantitative relationship between the calculated values (viscosity, activation energy and diffusion coefficient) and the operation conditions (solution mass fraction and temperature) was analyzed. Our results show that the DEAE-BDA absorbent has better application potential due to its lower viscosity, higher CO 2 diffusion coefficient and lower activation energy.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）