ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yu Chen,Yanfei Zhao,Bo Yu,Yunyan Wu,Xiaoxiao Yu,Shien Guo,Buxing Han,Zhimin Liu
A novel four-site ionic liquid (IL) was designed via the neutralization of citrazinic acid with tetrabutylphosphonium hydroxide, which had the highest CO2 absorption capacity of 3.26 mol per molar IL under ambient conditions to date. More importantly, it was found that the IL–CO2 complex displayed visible light absorption because of the delocalization effect in the conjugated anion complex, and it could promote the photoreduction of CO2 over anatase TiO2 under visible light irradiation, producing CH4 as the sole carbonaceous product with a rate of 3.52 μmol g–1 h–1 and a selectivity of >96%. The mechanism investigation indicated that the IL absorbed CO2 to form the IL–CO2 complex showing visible light absorption, which served as a photosensitizer to promote the photoreduction of CO2 over TiO2 under visible light irradiation. This work opens a new way to enhance visible light-driven photoreduction of CO2, which may have promising application.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2020
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IF 4.551
Yan Gao,Zhe Liu,Ruimin Gao,Guangfa Hu,Jianshe Zhao
In this work, a series of organic-inorganic hybrids based on N-alkyl-4-vinylpyridinium bromide ([C n VP]Br) with different carbon chain lengths and Dawson type heteropolyacid (HMoV) were designed and synthesized. And then the hybrids were loaded on mesoporous carbon aerogel (CA) with a high surface area of 1448.26 m 2 /g to form supported catalyst ([C n VP]MoV/CA), which used for extraction-oxidation desulfurization (EODS). Some techniques such as FT-IR, XRD , SEM, EDX , TEM, BET and XPS were used for characterization of the prepared materials. The test results show that the [C 6 VP]MoV/CA possesses the highest efficiency of 99.63% under the optimum conditions. Moreover, the catalysts can be efficiently reused with an efficiency of 85.39% after repeated use for 10 times, which confirms the industrial potential of the prepared [C 6 VP]MoV/CA.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2020
·Vol. 145
·期 5
·2343-2352
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IF 2.731
Li Xin,Liang Dong,Li Kai,Ma Xuemei,Cui Jianlan,Hu Zhiyong
A hypophosphorous acid-based ionic liquid [Bmim]H 2 PO 2 (BMP) was synthesized and characterized by FTIR, 1 HNMR, 13 CNMR and 31 PNMR. Moreover, a new intumescent flame-retardant system composed of BMP and expandable graphite (EG) was used to improve the flame retardancy of high-density polyethylene-based wood–plastic composites (WPC). The retardant properties and thermal decomposition behaviors were investigated by the limiting oxygen index (LOI) test, UL-94 vertical burning test, thermogravimetric analysis (TGA) and cone calorimeter test, respectively. When the mass ratio of BMP to EG was 1:2 and the total amount was kept at 30 mass%, WPC/EG-BMP composite passed UL-94 V-0 rating, and its LOI value increased to 31.5% from 21.4% for neat WPC. In addition, both the peak heat release rate and the total heat release of WPC/BMP-EG composite decreased significantly relative to WPC and WPC/EG composites according to cone calorimeter analysis. The TGA results suggested that BMP had good ability of char formation, and when combined with EG, it could greatly promote the formation of the protective char layer. The surface morphology and chemical structure of char residues were examined using scanning electron microscope–energy-dispersive spectrometer and Raman spectroscopy. It revealed that a compact and thick char layer was formed with the combination of BMP and EG, which hinder the transfer of heat flow and combustible gases in the condensed phase, thus exhibiting excellent flame retardancy. This study demonstrated that BMP and EG had a synergistic effect on the flame retardancy of WPC.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Di Li,Yanyan Gong,Minchen Du,Chao Bu,Cheng Chen,Somboon Chaemcheun,Jia Hu,Yongxing Zhang,Ye Yuan,Francis Verpoort
α-Hydroxy ketones are a series of biologically active fragments in nature as well as important synthons for organic chemistry. Herein, an AgOAc/1-ethyl-3-methylimidazolium acetate ionic liquid system was developed for the CO2-promoted hydration of propargylic alcohols and H2O to produce α-hydroxy ketones. Diverse desired products could be obtained in satisfactory yields under 1 bar of CO2 pressure with the catalysis of only a trace amount of silver (0.005–0.25 mol %), which is the lowest level ever reported for the metal-catalyzed systems. In particular, this system had robust recyclability, and it could be reused effectively at least 5 times. Furthermore, an unprecedented turnover number (TON) of 9200 was achieved, which is considered to be the highest TON ever reached for this hydration.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Min Shao,Muhan Chen,Mei Fan,Guoting Luo,Ci Jin,Zhangjie Huang
In this study, based on a cyano-functionalized ionic liquid, 1-nitrile-1-octylpyrrole bromide ([C 8 Y 3 Pr]Br), a [C 8 Y 3 Pr]Br/cyclohexane/tributyl phosphate (TBP)/NaCl microemulsion system was constructed and used for the extraction of Pd(II) and preparation of Pd nanoparticles from multimetal solutions. The key extraction parameters including vibration time, [C 8 Y 3 Pr]Br concentration, phase ratio ( R W/O ), and HCl concentration were evaluated. Compared with other ionic-liquid microemulsion systems, the cyano-functionalized ionic liquid [C 8 Y 3 Pr]Br microemulsion system showed excellent extraction performance for Pd(II). Almost all Pd(II) was extracted (>98.0%) from a multimetal solution using the microemulsion system, while the separation factors ( β Pd/M ) of [C 8 Y 3 Pr]Br-based microemulsions for Pd(II) with Cu 2+ , Fe 3+ , Ni 2+ , Zn 2+ , Co 2+ , and Mg 2+ exceeded 1.0 × 10 3 . The mechanism extracting Pd(II) using [C 8 Y 3 Pr]Br was confirmed to be an anion-exchange reaction via Job’s method, spectral analysis (UV, FTIR), and DFT calculations. Alcohols and hydrazine hydrate were used as demulsifiers, and Pd nanoparticles were directly obtained from the microemulsion phase. The Pd nanoparticles were identified by TEM, XPS, and XRD analyses. The chemical structures of extracted species based on the microemulsion system and the mechanism of demulsification of alcohols were studied. Thus, an effective new process was developed in this study for the direct preparation of Pd nanoparticles from mixed metal solutions via solvent extraction.
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ChemSusChem
·
2021
·Vol. 15
·期 1
·e202101398
·
IF 8.928
Yinghui Bian,Weichuan Jiang,Yonglei Zhang,Lishun Zhao,Xiaohang Wang,Zichuan Lv,Shuai Zhou,Yuqing Han,Hui Chen,Meng-Chang Lin
Graphical A closer look at sulfur : An Al−S cell using an AlCl 3 /acetamide electrolyte based on the oxidation of S IV shows a high working voltage of 1.70–1.95 V, whereas the cell based on the reduction of S (S x 2− ) exhibits a voltage of 0.31–1.20 V. A high-voltage Al−S cell with 0.33 mAh capacity can successfully light up a red LED (forward voltage: 1.6–2.0 V) for 2 h. This work may help in promoting the development of high-performance and low-cost Al−S batteries. Al-based batteries are promising next-generation rechargeable batteries owing to the abundance of raw materials and their high potential energy density. The Al−S system has attracted considerable attention because of its high energy density and low cost. However, its low discharge voltage plateau (0.6–1.2 V) hampers its practical application. Herein, eight ionic liquids or deep eutectic solvents were studied as electrolyte candidates for an Al−S cell. This was the first study to demonstrate that an Al−S cell based on an AlCl 3 /acetamide electrolyte (1.3 molar ratio) showed high discharge voltage plateaus (1.65–1.95 V) and a charging cut-off voltage of 2.5 V in Al−S cells. An Al−S cell of 0.33 mAh capacity with the AlCl 3 /acetamide electrolyte successfully lit up a red LED (forward voltage 1.6–2.0 V) for around 2 h. This work may help in promoting the development of high-performance and low-cost Al−S cells.
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Arabian Journal of Chemistry
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2021
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IF 5.165
Yanping Chen,Qichao Zhao,Yanling Yao,Tianhao Li
Water electrolysis is a promising method for hydrogen production, so the preparation of low-cost and efficient electrocatalysts with a quick and simple procedure is crucial. Herein, iron phosphate (Fe 7 (PO 4 ) 6 ) was prepared via microwave radiation using ionic liquid (IL) as iron and phosphorus dual-source. This method is simple and rapid, and the product can be directly used as electrocatalysts without further treatment. The experimental results show that the IL can influence the morphology and electrocatalytic performance. Moreover, the addition of carbon nanotubes (CNTs) is favorable for formation of iron phosphate nanoparticles to improve the catalytic activities. As hydrogen evolution reaction (HER) catalyst, this iron phosphate/CNTs exhibits an onset overpotential of 120 mV, Tafel slope of 32.9 mV dec -1 , and current densities of 10 mA cm −2 at overpotential of 185 mV. Then, it obtains a good activity for oxygen evolution reaction (OER) with a low onset potential of 1.48 V, Tafel slope of 73.3 mV dec -1 , and it only needs an overpotential of 300 mV to drive the 10 mA cm −2 . This bifunctional catalyst also shows good durability for HER and OER. This microwave-assisted method provides an outstanding strategy to prepare iron phosphate in a simple and fast process with good catalytic performance for water splitting.
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JOURNAL OF CHROMATOGRAPHIC SCIENCE
·
2019
·Vol. 57
·期 10
·950-960
·
IF 1.216
Wu Youyi,Zhou Jingwen,Wang Xuedong,Zhang Zhanen,Gao Shiqian
Ionic liquid-based hollow-fiber liquid–liquid–liquid microextraction (IL-HF-LLLME) coupled to capillary electrophoresis (CE) has been developed for the determination of six sulfonamides (SAs) in aquaculture waters. A series of extraction parameters was optimized to enhance the extraction efficiency, which included type and pore size of hollow fiber, type and composition of extraction solvent, pH value of donor phase, the concentration of acceptor phase and the mass ratio of donor phase to acceptor phase along with extraction temperature and time. Under optimal conditions, the IL-HF-LLLME-CE method provided a wide liner range for six SAs from 2 to 1,000 μg L−1 (r2 ≥ 0.9995), the limits of the detection from 0.25 to 0.48 and the enrichment factors from 122 to 230, respectively. Relative standard deviations for intra- and interday precision were 1.4–5.3% and 1.8–7.5% (n = 5), respectively. The proposed method was successfully applied for the determination of trace-level SAs in seven real-world aquaculture water samples with good recoveries (80.4–100.7%). Also, sulfamerazine and sulfamethoxazole were detected at the level of 0.52–1.60 μg L−1 in two water samples. Due to its good sensitivity, simple operation, short analysis time and eco-friendliness, the developed method has a great application potential in analysis of trace SA residues in aquaculture waters.
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BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Qiuxi Wei,Chen Wang,Xue Zhou,Tsunghsueh Wu,Yanying Wang,Chunya Li,Nianjun Yang
Metal-organic framework nanocrystal (Zn-MOF) was synthesized by using 3,3'-{(propane-1,3-diyl)bis[1-(4-carboxybenzyl)-1H-imidazol-3-ium]} hexafluorophosphate ionic liquid as the functional monomer and Zn 2+ as the central metal ion under hydrothermal conditions. Spatially confined gold nanoparticles (Au-NP) were prepared by in-situ reduction of chloroauric acid in the nanopores of Zn-MOF using acetic acid as the reducing agent to fabricate [email protected] nanocomposites . [email protected] was further functionalized with 1H-imidazolium-1,3-bis(2-aminoethyl)bromide ionic liquid (IBABr) to prepare [email protected] nanocomposites. All abovementioned nanomaterials were thoroughly characterized by TEM , SEM, XPS , FTIR, and nitrogen-adsorption surface area analysis. [email protected] were then deposited onto a glassy carbon electrode and used as the photoactive element to fabricate a label-free photoelectrochemical (PEC) immunosensor by immobilizing anti-squamous cell carcinoma antigen (anti-SCCA). The PEC sensing principle is based on the photocurrent decline due to the blocking effect of SCCA on the electron and mass transfer after binding SCCA to anti-SCCA. The photocurrent variation related to the specific recognition of SCCA shows a linear relationship to the logarithm of SCCA concentration in the range of 5.0 pg mL −1 to 15.0 ng mL −1 . The detection limit is as low as 2.34 pg mL −1 . Such a signal-off PEC immunosensor is highly selective, sensitive, stable, and reproducible towards SCCA detection. Its performance is comparable to enzyme-linked immunosorbent assay from the studies on clinical samples. This immunosensor is promising for the label-free determining SCCA in clinical human serum samples.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Hengjun Gai,Caiyun Zhong,Xiaofeng Liu,Lin Qiao,Xiaowei Zhang,Meng Xiao,Hongbing Song
In this study, gold (Au) and ruthenium (Ru) atoms were successfully anchored onto poly(ionic liquid)s (PILs) containing imidazolium-based ionic liquids (ILs) and ethylene glycol dimethacrylate (EGDMA), thereby yielding efficient heterogeneous encapsulated metal catalysts Au/PILs and Ru/PILs for the catalytic wet air oxidation (CWAO) of ammonia. The as-synthesized catalysts were characterized via X-ray photoelectron spectroscopy, scanning electron microscopy mapping, and transmission electron microscopy. The results indicated that the metal nanoparticles with uniform distribution could be produced due to the interactions between the supports and the metals, leading to an excellent catalytic property for catalysts. These catalysts exhibited good activity and stability for the CWAO of ammonia with high selectivity to nitrogen (N 2 ) under mild conditions. Compared with the Au/PILs catalyst giving 65.8% conversion with a selectivity of 99%, the Ru/PILs catalyst provided 86.5% ammonia conversion with 95% selectivity to N 2 under 1 MPa at 160 °C in 4 h.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Tiejun Mao,Shuang Wang,Xu Wang,Fengxiang Liu,Jinsheng Li,Hao Chen,Di Wang,Geng Liu,Jingmei Xu,Zhe Wang
A high-performance solid-state electrolyte was obtained using porous polybenzimidazole (pPBI) and ionic liquid (IL) (i.e., (1-(3-trimethoxysilylpropyl)-3-methylimidazolium chloride). IL is hydrolyzed to form Si–O–Si networks under acidic conditions, which guarantee the enhanced mechanical properties. The porous structure and Si–O–Si networks improve the acid retention capacity and conductivity simultaneously. The prepared porous composite film exhibits a proton conductivity as high as 0.103 S cm–1 at 170 °C. Then, an all-solid-state supercapacitor (ASSC) was assembled using the obtained film electrolyte and activated carbon electrodes. The electrochemical performance was evaluated at different temperatures (30, 60, 90, 120, and 150 °C). The prepared ASSC displayed a specific capacitance of 85.5 F g–1 at 120 °C, which is 3 times higher than that at 30 °C. Meanwhile, the ASSC displayed excellent long-term cycle stability after 10 000 constant current charge and discharge tests, 91.0% capacitance retention, and 95.8% coulomb efficiency. All the results indicate that the porous polymer electrolyte is promising for application in high-temperature energy-storage devices.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 20
·5309-5316
·
IF 3.286
Zhang Dianwei,Tang Jiaqi,Liu Huilin
A highly selective and sensitive fluorescent probe for optosensing lambda-cyhalothrin (LC) was prepared. The probe was based on sulfur-doped carbon dots (CDs) coated with molecularly imprinted polymers (MIPs). Doping the CDs with sulfur and modifying the surfaces of the CDs with an ionic liquid enhanced the performance of the fluorescent probe. The selectivity of the probe was improved through the application of molecular imprinting technology utilizing acrylamide and 1-vinyl-3-butylimidazolium tetrafluoroborate [VBIm][BF 4 ] as functional monomers. The resulting probe was used to detect LC, which is a pesticide residue, in vegetables and tea. Under optimal detection conditions, the linear range of the probe was found to be 1–150 μg kg −1 and the limit of detection to be 0.5 μg kg −1 by analyzing excitation/emission maxima at 350/450 nm. The developed method was successfully used to determine LC in vegetables and tea, yielding recoveries of 98.90–116.93%. These results suggest that this fluorescent probe based on MIP-coated, room-temperature ionic-liquid-sensitized, sulfur-doped carbon dots has great potential to be utilized for the precise detection of LC in complex samples.
Graphical abstract
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危险品化学品经营许可证（带存储）