JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Sai-Li Zheng,Yonghe He,Xiao-Kang Qiu,Yuan-Hui Zhong,Lai-Hon Chung,Wei-Ming Liao,Jun He
A novel metal-organic framework [CuCN(TMBP)·H 2 O] n ( TCuCN ) has been synthesized by the reaction of 3,3′,5,5′-tetramethyl-4,4′-bipyrazole (TMBP) and CuCN. Its structure was determined by single-crystal X-ray diffraction (SCXRD) analysis and further characterized by power X-ray diffraction (PXRD) analysis, FT-IR spectroscopy and thermogravimetric (TG) analysis. Previously reported structurally analogous TCuCl , TCuBr , TCuI have also been synthesized for Br 2 adsorption comparison. All of these four MOFs exhibited reversible uptake of Br 2 vapor judging by the unchanged PXRD patterns . Among four MOFs, Br 2 -loaded TCuI showed the most uptake amount of Br 2 (15.7 wt%), providing the formula to be TCuI ·0.33Br 2 . The different uptake amount of Br 2 for TCuX (X = CN, Cl, Br, I) should be mainly ascribed to the intermolecular interaction between CuX and Br 2 .
研究领域:
无机化学
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材料化学
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配位化学
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多孔材料
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气体吸附
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APPLIED ORGANOMETALLIC CHEMISTRY
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2013
·Vol. 27
·期 3
·148-154
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IF 2.011
Li Qiang Wu
Nano n -propylsulfonated γ-Al 2 O 3 is easily prepared by the reaction of nano γ-Al 2 O 3 with 1,3-propanesultone. This reagent can be used as an efficient catalyst for the synthesis of spiro [indoline-3,4-pyrazolo[3,4- e ][1,4]thiazepine]diones in aqueous media. This new method consistently has the advantages of excellent yields and short reaction times. Further, the catalyst can be reused and recovered several times. Copyright © 2013 John Wiley & Sons, Ltd.
研究领域:
催化化学
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有机合成
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绿色化学
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纳米材料
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药物化学
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2026
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IF 2.5
Wentao Zheng,Jialing Chen,Xinwen Zhang,Lu Xu,Qian Gu,Xianku Wu,Xuehua Zhang
The development of efficient, low-viscosity, and environmentally friendly solvents is essential for sustainable CO 2 capture. In this study, a series of ternary deep eutectic solvents (DEAz-DESs) were synthesized using 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) as the hydrogen bond acceptor, and ethylene glycol (EG) along with various azoles as hydrogen bond donors. These DESs exhibited excellent physicochemical properties, including low viscosity (7.83–41.41 mPa·s at 40 °C) and high thermal stability ( T d = 112–133 °C). The low viscosities enabled rapid CO 2 mass transfer and absorption kinetics. Among them, the DBN/Pyrazole/EG (3:1:1) system demonstrated a high CO 2 uptake of 0.194 gCO 2 /gDES at 1 bar and 40 °C. Combined spectroscopic characterization and DFT calculations elucidated dual chemisorption mechanisms: carbamate formation through pyrazolate and carbonate formation mediated by DBN-activated EG, jointly accounting for the elevated CO 2 absorption capacity. Thermodynamic analysis yielded moderate absorption enthalpies (−38 to −63 kJ/mol), indicating favorable regeneration at mild temperatures. The DBN/Pyrazole/EG (3,1:1) DES retained over 90% of its absorption capacity after 10 cycles, demonstrating excellent reusability. Compared with other reported DESs, the DEAz-DESs presented in this work offer superior absorption performance and lower viscosities. These findings suggest that the ternary DBN/azole/EG systems are promising candidates for efficient and sustainable post-combustion CO 2 capture applications.
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JOURNAL OF MOLECULAR LIQUIDS
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2023
·
IF 6
Wentao Zheng,Guangwen Yu,Guibing Xia,Wanghao Shen,Weizhong Shi,Tengteng Zhou,Xiankun Wu
Developing absorbents with highly efficient nitric oxide (NO) absorption and desorption is very important for flue gas denitrification process. Toward this end, a class of DBU-based deep eutectic solvents (DESs) containing alkanones or azoles as functional HBDs for the capture of NO were synthesized in this work, with viscosities of only 7.71–45.57 mPa·s at 303.2 K. Solubilities of NO in these DESs were determined at temperatures from 303.2 to 333.2 K and pressures from zero to 1 bar. It was found that the absorbing abilities of the DESs increased with the increasing HBDs’ alkalinity. Impressively, these DBU-based DESs had remarkable larger absorption capacities than those reported DESs in the literature. According to the solubility curves of NO, chemical absorption was thought to occur accompanying with the physical one in the systems. Therefore, the reaction equilibrium thermodynamic model (RETM) was applied to model the experimental NO solubilities. The corresponding thermodynamic parameters for each system, such as the reaction equilibrium constant, Henry’s law constant, and the enthalpy change were also obtained to assess the NO absorption process in these DESs.
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JOURNAL OF SOLUTION CHEMISTRY
·
2023
·Vol. 52
·期 9
·1033-1047
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IF 1.2
Li Ke,Li Renjiang,Duan Xiuzhi,Deng Dongshun
Emission of NH 3 or CO 2 containing tail gases will aggravate environmental problems of global climate warming, fog, and haze. Developing efficient absorbent for them is highly desirable. In present work, new type V pyrazole (Py)/glycerol (Gly) DESs with Py/Gly molar ratios of 1:1 and 1:2 were prepared. Their densities and viscosities with temperature were measured. The solubilities of NH 3 or CO 2 in two DESs were determined, with the near atmospheric solubilities of NH 3 and CO 2 up to 8.7052 mol·kg −1 and 0.0395 mol·kg −1 for Py/Gly DESs (1:1), respectively. Henry’s constant and the dissolution Gibbs free energy, enthalpy, and entropy changes of gas dissolution were obtained by correlating the experimental data. What’s more, Py/Gly DESs (1:1) presents potential ability to preferentially separate NH 3 from the tail gas containing NH 3 and CO 2 due to its ideal selectivity of NH 3 /CO 2 as high as 189.
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JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Ziqi Sun,Meiling Qi
This work presents the investigation of a novel CO 2 -based poly(ether-carbonate) copolymer, namely poly(propylene ether-carbonate)diol (PPCD), for gas chromatographic (GC) analyses. The PPCD column exhibited column efficiency of 4000 plates/m determined by naphthalene at 120 ℃ with the retention factor 6.23. Its separation performance was investigated by adopting a wide variety of analytes and isomers, including the isomer mixtures of alkanes, substituted benzene isomers with diverse groups, phenols and anilines, and the mixtures of organic solvents of high volatility, aliphatic amines and N-heterocycles. As a result, the PPCD column displayed distinctly higher resolving capability than the commercial columns described herein and achieved high column inertness towards acidic/basic analytes without involving any deactivation procedure. Additionally, it displayed excellent separation repeatability and reproducibility with the relative standard deviation (RSD) values less than 0.01% for within-day and in the range of 0.26% – 0.36% for between-day and 3.0% – 4.1% for between-column ( n = 4). Further, the PPCD column (30 m) was used to GC–MS analysis of the lemongrass essential oil and resolved more components well than the indicated commercial columns, evidencing its outstanding separation performance for analyses of complex samples. Up to date, the CO 2 -based poly(ether-carbonate) copolymers are not reported in the field of chromatography. This work demonstrates their promising future as a new type of selective and inert stationary phases for practical GC analyses.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Sumbal Farid,Qing Mao,Suzhen Ren,Ce Hao,Xufeng Dong
Nanoscale pyrazolate-based coordination polymers (CPs) are becoming increasingly popular as electrocatalysts owing to their customizable compositions and structures. However, using them for oxygen evolution reaction (OER) is highly challenging due to their unsatisfactory catalytic efficiency and relatively low stability. Herein, a simple one-step solvothermal process was employed for the fabrication of polycrystalline nickel-pyrazolate [Ni(Pz)] with an unusual lamellar nanorod-assembled microsphere morphology for the first time using ethanol as a green organic solvent via controlling other physical parameters. Meanwhile, the Ni(Pz) structure and morphology are investigated to derive its formation process following the different monomeric feed ratios relying on the metal/ligand interactions of CP. Shaping the Ni(Pz) electrocatalyst in well-oriented lamellar nanorod-assembled microspheres brings the advantage of porosity and high specific surface area, which expedites mass/charge transport and contact with the electrolyte as well as creates less tortuous pathways for charge distribution, thus improving the charge homogeneity. These high-class structural features and polycrystalline nature of Ni(Pz)-E-PVP facilitate amazing catalytic OER activity with a low overpotential of 290 mV at 10 mA cm–2 and a Tafel slope of only 94 mV dec–1 beyond the yardstick material (i.e., RuO2) in alkaline solution. A suite of measurements, entailing X-ray photoelectron spectroscopy and density functional theory calculations, suggest that the rich Ni–N4 moieties in Ni(Pz)-E-PVP are central species providing adsorption sites for OER intermediates. This facile protocol is prophesied to commence the imminent development of noble metal-free, effective, and low-priced electrocatalysts for OER.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Yangke Long,Shixin Huang,Shiyin Zhao,Guicong Xiao,Jianlin Sun,Dan Peng
The practical application of periodate-based advanced oxidation technologies (PI-AOTs) for wastewater treatment requires efficient and cost-effective activators. Pyrolyzed Fe–N/C materials are potential candidates, however, their actual active sites and activation mechanisms are yet to be fully understood. Herein, a series of Fe–N/C samples (denoted as Fe@NC- X ) with differing structures and iron components were delicately synthesized. Experimental studies on the structure–activity relationship and density functional theory (DFT) computations revealed that Fe–N x species serve as the dominant active site for periodate activation, while the inactive iron-based particles (i.e., Fe 0 and Fe 3 C) optimized the binding affinity of surrounding carbon layers with periodate, resulting in enhanced activity. In-depth exploration of the oxidative mechanism revealed that Fe@NC- X activated periodate through an electron transfer regime. Our results also showed that the optimal Fe@NC-0.2/periodate system was highly effective in catalyzing the oxidation of 4-CP, outperforming many reported activators. These findings provide an indispensable foundation for the rational development of advanced Fe–N/C activators and offer vital insights into the mechanism underlying pollutant destruction through PI-AOTs.
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HUMAN & EXPERIMENTAL TOXICOLOGY
·
2021
·
IF 2.903
Hai-Yan Jiang,Yan-Ni Bao,Feng-Mei Lin,Yong Jin
Triptolide (TP), the main active compound extracted from medicine- tripterygium wilfordii Hook f. (TWHF). It has anti-tumor and immunomodulatory properties. Our study aimed to investigate the mechanisms of hepatotoxicity treated with TP in vivo and in vitro, as well as their relationship with the NF-κB (p65) signal pathway; and to assess TP-induced hepatotoxicity after CYP2E1 modulation by the known inhibitor, clomethiazole, and the known inducer, pyrazole. Mice were given TP to cause liver injury and IHHA-1 cells were given TP to cause hepatocyte injury. The enzyme activity and hepatotoxicity changed dramatically when the CYP2E1 inhibitor and inducer were added. In comparison to the control group, the enzyme inducer increased the activity of CYP2E1, whereas the enzyme inhibitor had the opposite effect. Our findings suggest that TP is an inducer of CYP2E1 via a time-dependent activation mechanism. In addition, TP can promote oxidative stress, inflammatory and involving the NF-κB (p65) signal pathway. Therefore, we used triptolide to stimulate C57 mice and IHHA-1 cells to determine whether TP can promote oxidative stress and inflammation by activating CYP2E1 in response to exacerbated liver damage and participate in NF-κB (p65) signaling pathway.
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MOLECULAR CRYSTALS AND LIQUID CRYSTALS
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2023
·
IF 0.7
Chao Feng,Chang-Peng Lv,Jing-Jing Guo,Dong-Xu Li,Juan-Ni Zhang
The article discusses the synthesis and characterization of a new Cu-based complex, [Cu(Hpz)4SO4]]•[Cu(Hpz)4(H2O)SO4]•H2O (1), obtained via solvothermal method with the ligand 1H-pyrazole (Hpz). The complex exhibits a co-crystal structure composed of two independent units. The crystal structure was further confirmed by PXRD Rietveld refinement. In three-electrode system tests, the electrode made from this co-crystal complex displayed a high specific capacitance and a good cycling stability. At a scan rate of 3 mV s−1, the maximum specific capacitance was 242.4 F g−1, and after 2000 cycles at a current density of 2 A g−1 in a 1 M KOH solution, a capacitance of 95.5% was retained.
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Chemical Science
·
2023
·Vol. 15
·期 2
·726-735
·
IF 8.4
Rong Zhang,Jiajing Lan,Fei Wang,Shumei Chen,Jian Zhang
In this study, we synthesized multi-nuclear indium oxide clusters (InOCs) using 1,1′-ferrocene dicarboxylic acid (H2FcDCA) as the chelating and surface protection ligand. The obtained clusters include the cubane-type heptanuclear InOCs ([In7]) and the sandwich-type thirteen-nuclear InOCs ([In13]). Notably, [In13] represents the highest nuclear number reported within the InOC family. In addition, the presence of labile coordination sites in these clusters allowed for structural modification and self-assembly. A series of [In7] clusters with adjustable band gaps have been obtained and the self-assembly of [In7] clusters resulted in the formation of an Fe-doped dimer, [Fe2In12], and an imidazole-bridged tetramer, [In28]. Similarly, in the case of [In13] clusters, the coordinated water molecules could be replaced by imidazole, methylimidazole, and even a bridged carboxylic acid, allowing the construction of one-dimensional extended structures. Additionally, part of the H2FcDCA could be substituted by pyrazole. This flexibility in replacing solvent molecules offered diverse possibilities for tailoring the properties and structures of the InOCs to suit specific applications.
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CHEMOSPHERE
·
2023
·
IF 8.8
Ge Zhang,Weihong Wu,Meng Yao,Yumeng Cui,Yunhong Jiao,Hongqiang Qu,Jianzhong Xu
The traditional method of preparing graphene will cause serious environmental pollution, and the combustion of polymer materials will seriously harm people's health. In this paper, a Cu-MOF-coated graphene composite flame retardant (G@Cu-MOF) rich in flame retardant elements such as B and N was synthesized through green mechanical ball milling method. Flame retardants reduce the threat to the environment and people's lives and property. After adding 6 wt% G@Cu-MOF, the peak heat release rate, total heat release rate, CO production and CO 2 production of epoxy resin (EP) composite samples decreased by 55, 14, 59, and 55%, respectively. This type of Cu-MOF releases incombustible gases such as boron trifluoride (BF 3 ) and ammonia (NH 3 ) during combustion, diluting the concentration of combustible gases and producing copper borate in the condensed phase. Cu 2+ is reduced to Cu, and boron compounds are converted into boron oxides. The thermal conductivity of graphene can reduce the temperature of the matrix, and has good flame retardancy. It synergistically acts with Cu-MOF to promote the formation of high-quality residual char, and can significantly inhibit the heat and smoke release of EP. It plays a role in flame retardancy and protecting the substrate from fire. This study provides a new approach for preparing graphene hybrid flame retardants through mechanical ball milling, in order to improve the flame retardancy of EP and suppress the release of smoke and toxic gases.
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