ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Mingyu Li,Yuhan Ma,Jingjing Jiang,Tianren Li,Chongjun Zhang,Zhonghui Han,Shuangshi Dong
Heterogeneous photo-Fenton technology has drawn tremendous attention for removal of recalcitrant pollutants. Fe-based metal-organic frameworks (Fe-MOFs) are regarded to be superior candidates in wastewater treatment technology . However, the central metal sites of the MOFs are coordinated with the linkers, which reduces active site exposure and decelerates H 2 O 2 activation. In this study, a series of 2, 5-dioxido-1, 4-benzenedicarboxylate (H 2 DOBDC)-functionalized MIL-100(Fe) with enhanced degradation performance was successfully constructed via solvothermal strategy. The modified MIL-100(Fe) displayed an improvement in photo-Fenton behaviors. The photocatalytic rate constant of optimized MIL-100(Fe)-1/2/3 are 2.3, 3.6 and 4.4 times higher compared with the original MIL-100(Fe). The introduced H 2 DOBDC accelerates the separation and transfer in photo-induced charges and promotes Fe(II)/Fe(III) cycle, thus improving the performance. •OH and •O 2 − are main reactive radicals in tetracycline (TCH) degradation. Dealkylation, hydroxylation, dehydration and dealdehyding are the main pathways for TCH degradation.
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DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Xuemin Zhong,Yanfu Wei,Samahe Sadjadi,Dong Liu,Mengyuan Li,Ting Yu,Guanzheng Zhuang,Peng Yuan
Aerobic oxidation of biomass-derived 5-hydroxymethylfurfural (HMF) to 2, 5-furandicarboxylic acid (FDCA) is an important reaction for producing green and sustainable chemicals. Herein, natural clay mineral palygorskite (Pal)-supported bimetallic Pt–Pd catalyst for the oxidation of HMF to FDCA in water without the addition of any bases was developed. The 1Pt 9 Pd 1 /Pal catalyst with Pt/Pd molar ratio of 9/1 exhibited excellent catalytic performance, and 100% HMF conversion and 99% FDCA yield were obtained under optimum reaction conditions after 12 h, which was mainly attributed to the synergy between palygorskite and bimetallic Pt–Pd nanoparticles . Palygorskite used as support realized the immobilization and dispersion of bimetallic nanoparticles, increasing the catalytic activity . The basicity of palygorskite and alloying effects between Pt and Pd facilitated the formation of FDCA by synergistically catalyzing the oxidation of alcohol and aldehyde groups in the reactants and intermediates. Furthermore, this catalyst showed good stability and reusability . The present work provides a highly efficient, cost-effective, and environmentally benign catalyst for the base-free oxidation of HMF to FDCA in practical industrial applications.
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DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Jian He,Huining Zhao,Xinru Hu,Zhiyong Fang,Jilin Wang,Rui Zhang,Guoyuan Zheng,Bing Zhou,Fei Long
In this study, a new type of 0-dimensional organic–inorganic hybrid perovskite single crystal (2-5-py)2MnBr4 was synthesized using 2-amino-5-methylpyridine (2-5-py) as the organic ligand. The crystal is a center-symmetric P-1 space group with a grain size of 20 mm, which belongs to the triclinic crystal system. It has a strong absorption of violet and blue light as well as excellent thermal stability. Its optical band gap is 2.38 eV, which is in good agreement with the theoretical band gap (2.39 eV) calculated by density functional theory. Under the excitation of a suitable light source, it can emit 526 nm pure bright green lights, which are confirmed by the main peaks to be almost in the green range with a full width at half maximum of 45 nm. As a result, the quantum efficiency and fluorescence lifetime reached a high level of 44.2% and 117 μs, respectively. Based on the good fluorescence performance of the crystal, a white LED with a color rendering index of 97 was finally successfully fabricated, realizing the leap from basic materials to optoelectronic devices.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Chuncheng Zhang,Chaomin Zhang,Chao Yun
In this paper, Er 3+ /Ho 3+ co-doped fluoride glasses were prepared by the high temperature melt-quenching technique. Pumped by the 980 nm LD , as a result of the emission spectra overlapping of Er 3+ and Ho 3+ ions, a broadband mid-infrared emission band from 2530 to 2950 nm with a full width at half maximum of the synthetic fluoride glasses near 231 nm was obtained, which exist latent application in wide band tunable mid-infrared fiber laser. Furthermore, the intense 4.1 μm mid-infrared fluorescence (3600–4400 nm) was obtained and the FWHM was 320 nm. The up-conversion emission peaks around 525, 546 and 660 nm, near-infrared emissions at 1.2 and 1.5 μm together with mid-infrared fluorescence around 2.0 μm was observed in Er 3+ /Ho 3+ co-doped fluoride glass. Moreover, the relevant energy transfer processes were discussed in detail based on the emission spectrum and the energy level transition processes. The results indicate that the fabricated Er 3+ /Ho 3+ co-doped fluoride glasses exist prominent emission features for fiber laser gain medium.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Bin Hu,Chunyang Li,Zengchen Liu,Xinlei Zhang,Wen Luo,Lin Jin
Two novel asymmetric structure monomers , 3,6-Bis-(2,3-dihydro-thieno[3,4- b][1,4]dioxin-5-yl)-9-[4-(2,5-di-thiophen-2-yl-pyrrol-1-yl)-phenyl]-9H-carbazole (BDTC) and 2,7-Bis-(2,3-dihydro-thieno[3,4-b][1,4]dioxin-5-yl)-9-[4-(2,5-di-thio phen-2-yl-pyrrol-1-yl)-phenyl]-9H-carbazole (BDDC), were designed and synthesized. Both the monomers could be electropolymerized to form the related polymer films. The electrochemical and electrochromic properties of polymer films were different from that of their homopolymers , which could be attributed to the similar copolymerization effect of asymmetric structure. Different linked positions also led to different features, PBDDC film showed more colors (orange, yellow green, green and blue) than that of PBDTC film (yellow, green and purple blue). However, after the introduction of 2, 2′-Bi(3,4-ethoxylene dioxy thiophene)(BIEDOT), the resulting copolymers exhibited similar electrochromic features(red, brown yellow, green and blue) due to the leading effect of EDOT units. Moreover, all the polymer films displayed fast switching time, reasonable optical contrast and good coloration efficiency, which made them have potential application in electrochromic devices.
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高影响因子
Catalysts
·
2024
·Vol. 14
·期 12
·929
·
IF 3.8
Jingxin Tan,Mengqi Li,Lingtao Liu,Lijian Wang,Haocun Wang,Junjie Bian,Chunhu Li
Biomass platform compound 5-Hydroxymethylfurfural (HMF), with its low price and abundant source, can be used as a renewable resource to replace traditional petrochemicals. MOF-808(Zr) has tunable active sites and excellent stability under high temperatures and acidic as well as basic environments, and the unsaturated coordination of metal ions within its framework structure can exhibit Lewis acidity, facilitating catalytic transfer hydrogenation from HMF to 2, 5-Furandimethanol (BHMF). The hydrothermal–impregnation–reduction method was used to prepare Cu/MOF-808 catalysts with high catalytic performance. Formic acid was chosen as the hydrogen donor solvent. The selectivity and yield of BHMF were 75.65% and 71%, respectively, at 150 °C for 4 h. A reaction pathway for the catalytic hydrogen transfer of HMF to BHMF was proposed. The high activity and stability of the Cu/MOF-808 catalyst with dual active sites provide a viable method for feasible hydrogenation of HMF to high value-added compounds.
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高影响因子
ENERGY
·
2020
·
IF 6.082
Yuchen Ya,Xiaokang Nie,Weiwei Han,Longkai Xiang,Mingyan Gu,Huaqiang Chu
The effects of 2, 5-dimethylfuran (DMF)/ethanol addition on the atomized combustion soot formation characteristics of n-heptane/iso-octane coflow diffusion flames are systemically studied. The changes of soot particles and deposition morphology at different heights in the flame of reference fuel with 15% ethanol (E15) and 15% DMF (DMF15) are analyzed. Results show that the addition of oxygenated fuels can increase the flame heights and decrease the brightness. With the addition of 15% ethanol and DMF, the flame heights are increased by 11.29% and 19.35% respectively, and the brightness of the edge region of the middle section of DMF15 flame is enhanced. At the nozzle, the average temperature of E15 flame increases by 80 K. The high temperature region of E15 flame enlarged and the average temperature difference of different heights is higher than 50 K. As for DMF15, the high temperature region of flame is constant, and the average temperature difference between various heights is smaller than 35 K. For three fuels, the size of the sediment particles formed at the low height above burner (HAB = 20 mm) is large, and the obvious pore structure can be seen at HAB = 60 mm. The addition of oxygenated fuels makes the pore structure distribution regular and the porosity decreases, and DMF15 (porosity = 0.2670) has larger pore structure than E15 (porosity = 0.1557). The oxygenated fuel can inhibit the formation of soot precursors and the agglomeration of soot particles, but the increase of particle size in the middle region of flame is promoted because of the increase of flame height and residence time of soot particles. As a result, the soot particle size of oxygenated fuel is decreased greatly in the oxidation stage, and the soot particle size of DMF15 (40.4%) is decreased more than that of E15 (37.1%). The effect of ethanol and DMF addition on the activation energy of low position soot is not obvious, which is about 130 kJ/mol. In the middle position of the flame, the activation energy of E15 is the highest (159.32 kJ/mol), and the activation energy of DMF15 is the smallest (148 kJ/mol). At the high position, E15 (212.07 kJ/mol) and DMF15 (226.73 kJ/mol) are less than that of DE0 (235.03 kJ/mol) respectively, indicating that the activation energy of the mature soot reduces, which is beneficial to the oxidative removal. Ethanol can dilute the fuel and increase the oxygen concentration in the mixture, while DMF can delay the ignition and prolong the residence time of soot and increase the content of disordered carbon in mature soot particles.
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高影响因子
Sustainable Chemistry and Pharmacy
·
2024
·
IF 5.5
Zhi-Gang Zhang,Yan Yi,Jia-Chun Lin,Dong Chen,Xiao-Jun Ji
2, 5-furandicarboxylic acid (FDCA) is a versatile bio-based building block that can be used for the synthesis of degradable polymers. Recently, developing green and sustainable catalytic processes for producing FDCA from renewable platform chemical molecules has attracted continuing attention. In this study, we proposed a green and sustainable one-pot, two-step biocatalytic process for the sequential oxidation of biomass-derived 5-hydroxymethylfurfural (HMF) to form FDCA with good yield and excellent selectivity. The initial step involves the oxidation of HMF to 2, 5-diformylfuran (DFF) and 5-formyl-2-furancarboxylic acid (FFCA) catalyzed by recombinant E. coli cells expressing a 5-hydroxymethylfurfural oxidase . The second step is to convert DFF and FFCA into FDCA final product via aldehyde oxidation reaction catalyzed by Deinococcus wulumuqiensis R12 whole cells . Combining the two different whole-cell biocatalysts , 180 mM of HMF could be easily converted into FDCA with a yield of 99% under optimized reaction conditions. This study offers an efficient and sustainable approach for the valorization of biomass-based HMF to form value-added FDCA.
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Lin Zhou,Zhanghong Guo,Jingxuan Guo,Haining Cui,Jinxin Ma,Chan Wang,Qijun Song
2, 5-furandicarboxylic acid (FDCA) is an eco-friendly polyester monomer that holds great promise for the production of biodegradable plastics. FDCA can be prepared by the oxidation of 5-hydroxymethylfurfural (HMF), but the transformation was usually achievable only in alkaline conditions, resulting in a millimolar level reaction and complicated product purification. In present work, a series of iridium nanozymes with an average size of 2 nm were synthesized by using tartaric acid (TA) or other structurally similar small molecular ligands as the stabilizing agents. The different ligands significantly affect the Ir 4f binding energy, with TA exhibiting superior electron donation effect to the Ir center, thus facilitates the electron transfer and the enhancement in enzymatic efficiency. In the presence of H 2 O 2 , the TA-Ir nanozymes can directly catalyze the conversion of molar level HMF to FDCA in acidic condition (pH 4), achieving 99.8% HMF conversion and ∼ 90% FDCA yield.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 67
·15401-15410
·
IF 5.16
Gaowei Qian,Xiangbing Wang,Shengyue Wang,Yanqiong Zheng,Song Wang,Weiguo Zhu,Yafei Wang
Graphical Four ′T′-shaped molecules bearing the 2,1,3-benzothiadiazole skeleton were prepared and characterized. All compounds exhibited excellent thermal stability and polymorphism in the solid state. The structure–property relationship of these compounds was systematically explored. A highest external quantum efficiency of 6.15 %, beyond the theoretical value of fluorescence-based OLEDs (∼5 %), were achieved for the solution-processable OLEDs. Polymorphism, the intrinsic character of one chemical compound with at least two distinct phase arrangements, plays a very key role in the photophysical properties. In this contribution, four ′T′-shaped molecules bearing the 2,1,3-benzothiadiazole (BTD) skeleton, named 5 a – 5 d , were prepared and characterized. All compounds exhibited excellent thermal stability and polymorphism in the solid state, evident from thermogravimetric analysis, differential scanning calorimetry, and polarized optical microscopy results. Intense emissions with high photoluminescent quantum yields were achieved both in solution (56–97 %) and neat films (33–98 %). All compounds possessed clearly pH-dependent luminescence properties in solution. Additionally, compound 5 d showed useful mechanochromic luminescence owing to the transformation between the crystal and amorphous state. Employing compounds 5 a – 5 d as the dopant, solution-processable organic light-emitting diodes (OLEDs) were fabricated and presented a highest external quantum efficiency of 6.15 %, which is higher than the theoretical value of fluorescence-based OLEDs (∼5 %). This research provided a novel strategy for designing high-efficiency BTD-based polymorphic luminescent materials.
研究领域:
材料科学
·
光学
·
有机电子学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jinhua Lai,Feng Cheng,Shuolin Zhou,Sha Wen,Dongwen Guo,Wenguang Zhao,Xianxiang Liu,Dulin Yin
Nitrogen-containing polymer-supported Cu-doped MnO 2 (Cu-MnO 2 @PDVTA) nanowires were prepared and their catalytic performances were evaluated via oxidation of biomass-derived 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA). The Cu-MnO 2 @PDVTA catalysts were characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, N 2 physical adsorption, transmission electron microscopy, and X-ray photoelectron spectroscopy. Both the Cu 2+ and MnO 2 nanoparticles were found to synergistically promote HMF oxidation to FDCA via 2,5-furandicarbaldehyde and 5-formyl-2-furancarboxylic acid intermediates. The Cu-MnO 2 @PDVTA-3 catalyst demonstrated the highest catalytic activity, providing FDCA with an excellent yield of 96.8% after 12 h at 80 °C. The time course of HMF oxidation revealed that oxidation of the hydroxyl group in HMF was easier than that of the aldehyde group. Cu-MnO 2 @PDVTA-3 could act as a reusable heterogeneous catalyst for HMF oxidation.
研究领域:
化学工程
·
材料科学
·
催化反应
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DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2023
·
IF 2.8
Ruiqin Huang,Wei Li,Xiaoling Luo,Zheng Liu,Guo-Cheng Han,Runzhi Wei
2,5-bis(trifluoromethyl)terephthalic acid (H 2 L 1 ) as the main ligand and 1,10′-phenanthroline (L 2 ) as the co-ligand were reacted with manganese chloride tetrahydrate (MnCl 2 ·4H 2 O), nickel sulfate hexahydrate (NiSO 4 ·6H 2 O) and cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) by solvothermal reaction to give the manganese complex [Mn 2 (L 1 ) 2 (L 2 ) 2 ] n ( 1 ), the nickel complex {[Ni 3 (L 1 ) 3 (L 2 ) 2 (H 2 O) 4 ]·2DMF} n ( 2 ) and the cobalt complex {[Co 2 (L 1 ) 2 (DMF) 2 ]·H 2 O} n ( 3 ). The structures were characterized and their properties studied by means of single-crystal X-ray diffraction, infrared spectroscopy, elemental analysis, ultraviolet spectroscopy, fluorescence spectroscopy, thermogravimetric analysis. The single-crystal structure analysis showed that the complexes 1 – 3 are infinitely extended three-dimensional network-like structures of space groups P 1 - , P 1 - , P 2 1 / n , respectively. The results of fluorescence analysis and thermogravimetric analysis showed that complexes 1 – 3 have good thermal stability and fluorescence properties, respectively. Complex 3 can also maintain good thermal stability at 230 °C, and the maximum fluorescence emission wavelength is 370 nm.
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高影响因子
危险品化学品经营许可证（带存储）