Molecular Catalysis
·
2022
·
IF 5.089
Mantong Xue,Jianfei Sun,Xintong Li,Jianlei Qi,Qinqin Xu,Jianzhong Yin
Emissions of carbon dioxide can lead to the greenhouse effect, causing global warming and so on. conversion of carbon dioxide into high-value chemicals through catalysis, which is an effective method to successfully curb carbon emissions and prevent the greenhouse effect. Among them, CO 2 chemical synthesis of cyclic carbonate is one of the important way. In this paper, a new type of supported ionic liquid catalyst (GO-[DBU][Br]) was synthesized by one-pot method. Subsequently, the GO-[DBU][Br] was applied to the cycloaddition reaction of CO 2 in batch reaction and fixed bed continuous reaction, respectively. The stability of the catalyst was also explored, the GO-[DBU][Br] was easily separated and reused at least 5 times without significant loss of catalytic activity. The excellent catalytic performance comes from the synergistic effect of ionic liquid cations, halogenated anions, and a large number of oxygen-containing functional groups on the GO surface, a possible reaction mechanism was thus proposed. The study provides a safe, efficient, and industrial-scale continuous reaction system for CO 2 utilization.
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Analytical Methods
·
2022
·Vol. 15
·期 2
·171-178
·
IF 3.532
Ruilin Yang,Lu Liu,Han Yeong Kaw,Minshu Li,Ji Man Kim,Donghao Li,Cuicui Liu,Meihua Dong,Mingshi Jin
Surface chemistry of electrodes plays a critical role in the fields of electrochemistry and electric-field-assisted separation. In this study, making ingenious use of the ordered mesoporous structure of silica materials and the electrochemical stability of ionic liquids (ILs) when integrated with polyvinylpyrrolidone (PVP), the PVP-modified IL-mesoporous silica/platinum wire (Pt/PVP@meso-SiO2@IL) was fabricated to increase hydroelectric stability and avoid the problem of electrode polarization. The effect of different amounts of mesoporous silica material used to modify the surface of the Pt electrode was systematically investigated. As a result, we successfully obtained a highly ordered mesoporous Pt/PVP@meso-SiO2 material with smooth surface. Because pentyl triethylamine bis(trifluoromethylsulfonyl) imide exhibits a wide electrochemical window between −3 to 3 V, this IL was chosen to modify mesopores under vacuum. Even after repeatedly applying electric field on Pt/PVP@meso-SiO2@IL 100 times, this working electrode remained stable and showed high hydroelectric stability. After verifying the feasibility of this method, it was successfully applied in the electric-field-assisted separation of 2.0 and 3.0 μm polystyrene particles without any impediment from electrode polarization problems. This work provides a brand-new insight for resolving the problem of electrode polarization by developing a versatile tool for the electroseparation of micro-objects.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Xiaolu Tian,Yikun Yi,Zhendi Wu,Guangyu Cheng,Shentuo Zheng,Binren Fang,Tao Wang,Dmitry G. Shchukin,Feng Hai,Jingyu Guo,Mingtao Li
Although the low t Li + and fluid nature of ionic liquid electrolytes can lead to weakened rate capability and higher leakage risks, these challenges can be tackled by incorporating ILs into solid hosts with controlled properties. Herein, we designed a heterogeneous metal organic framework (MOF)/polymerized ionic network (PIN) core-shell composite as a porous host for IL N,N-diethyl-N-(2-methoxyethyl)-N-methylammonium bis(trifluoromethylsulphonyl)imide (DEME-TFSI). The PIN shell with abundant ionic structures exhibit nice compatibility with ILs to achieve high loading, while the MOF core has narrow nanopores to confine large anions in ILs and enhance Li + selectivity. The as-synthesized conductive solid electrolyte (HKUST@PIN-IL-Li) showed high IL loading, high ionic conductivity over 4 × 10 −4 S cm −1 at 25 °C and increased Li + transfer number (0.367) in comparison to hollow H-PIN-IL-Li and bare IL-Li electrolyte. Overall, our research demonstrates for the first time a novel MOF@PIN core-shell structure as a solid framework for IL with high battery performance.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 9
·4337-4345
·
IF 3.3
Zhangbin Liao,Yunlong Duan,Liying Guo,Rongrong Zheng,Liyan Wang,Yanming Chen,Linnan Zhang,Xin Qian
Five titanium-centered heteropoly acids with different metal vacancies were prepared first, and then combined with an ionic liquid by ion exchange to prepare heteropoly acid ionic liquid catalysts Bmim4–6[M(H2O)TiMo11O39] (M = Cu2+, Fe2+, Pb2+, Ti4+, and Zn2+). The structure and thermal properties of each catalyst were tested and analyzed by Fourier transform infrared (FTIR) spectroscopy, ultraviolet (UV) spectroscopy, X-ray powder diffraction (XRD), apparent morphology analysis, and thermogravimetric analysis (TGA). Five heteropoly acid ionic liquids were investigated by using waste mineral water bottles as samples for performance in the catalytic degradation of bottle-grade polyethylene terephthalate (PET), and the degradation product, bis(2-hydroxyethyl) terephthalate (BHET), was analyzed for the chemical structure. The results showed that the five heteropoly acid ionic liquid catalysts were successfully prepared, with good thermal stability. Of these catalysts, Bmim4[Ti(H2O)TiMo11O39] showed the optimal catalytic performance. It achieved an alcoholysis rate of 100% and a yield of BHET of 84.73% with a catalyst dosage of 0.6% (percentage in the total mass of the raw materials) at 190 °C for 5 h. Moreover, after six cycles of use, the alcoholysis rate was still as high as 94.36%, and the yield of BHET was 75.65%. The above results indicated that the prepared heteropoly acid ionic liquid catalysts showed good performance in the catalytic degradation of bottle-grade PET, presenting a promising prospect for development.
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Polymers
·
2022
·Vol. 14
·期 10
·1950
·
IF 4.967
Zhefei Ruan,Yuzhe Du,Hongfei Pan,Ruiming Zhang,Fangfang Zhang,Haolin Tang,Haining Zhang
A solid-state polymer electrolyte membrane is formed by blending poly(vinylidene fluoride-co-hexafluoropropylene) with the synthesized copolymer of poly(methyl methacrylate-co-1-vinyl-3-butyl-imidazolium bis(trifluoromethanesulfonyl)imide, in which lithium bis(trifluoromethane)sulfonimide molecules are applied as the source of lithium ions. The accordingly formed membrane that contains 14 wt.% of P(MMA-co-VBIm-TFSI), 56 wt.% of PVDF-HFP, and 30 wt.% of LiTFSI manifests the best electrochemical properties, achieving an ionic conductivity of 1.11 × 10−4S·cm−1at 30 °C and 4.26 × 10−4S·cm−1at 80 °C, a Li-ion transference number of 0.36, and a wide electrochemical stability window of 4.7 V (vs. Li/Li+). The thus-assembled all-solid-state lithium-ion battery of LiFePO4/SPE/Li delivers a discharge specific capacity of 148 mAh·g−1in the initial charge–discharge cycle at 0.1 C under 60 °C. The capacity retention of the cell is 95.2% after 50 cycles at 0.1 C and the Coulombic efficiency remains close to 100% during the cycling process.Keywords:solid polymer electrolyte;all-solid-state;lithium-ion battery;ion conduction;polymer composite
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Heng Mao,Han Jiang,Le Sang,Shuo Li,Fu-Xue Chen,Zhi-Ping Zhao
Biomass hydrolysis into fermentable reducing sugars is essential for the bioethanol production. Novel integrated ionic liquid (IL) hybrid polymeric fixed-bed reactor with porous sponge-like structure was constructed for inulin hydrolysis. The acidic IL, [(CH 2 ) 3 SO 3 HVIm]HSO 4 was covalently grafted on polysulfone (PSF). The PSF-ILs integrated porous fixed beds were elaborately prepared by famous non-solvent induced phase separation approach. Effects of coagulation bath composition and temperature, fixed bed height, permeation flux, feed temperature and concentration on inulin hydrolysis were explored intensively. The porous sponge-like structure and chemical binding of ILs endowed the fixed beds with excellent catalytic performance, stability, and reusability. Under optimized conditions, once the inulin aqueous solution permeated through the fixed beds, the yield of total reducing sugar (TRS) reached up to 98.82%. Compared with the catalytic membrane, the hydrolysis reaction time was drastically shortened by 92.5%. These findings provided a new strategy on developing high-performance fixed-bed reactors for biomass conversion .
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Journal of Nanomaterials
·
2022
·
IF 3.791
Ziyi Jiao,Yonggang Teng,Chunjing Zhan,Youbei Qiao,Yuying Ma,Chaoli Wang,Hong Wu
Photodynamic antimicrobial chemotherapy (PACT) is a promising therapy against biofilm infection. However, due to the saliva clearance and obstacle of biofilm, the photosensitizer is difficult to concentrate in the infection site; then, the PACT is less effective on oral biofilm infection. In this article, we report a special nano-antibacterial agent (SiO2-PCe6-IL) to solve the bottleneck problem of PACT in treatment of oral biofilm infections. The SiO2-PCe6-IL was composed of SiO2 and poly ionic liquid photosensitizer (PCe6-IL) and had tri-fold features of eliminate biofilm infection: high binding ability, breaking biofilm barriers, and enrichment photosensitizer in infection site. In oral biofilm, the SiO2-PCe6-IL changed to SiO2-PIL+ like claws of octopus that could hold tightly with biofilm. Then, the poly-dodecyl on the SiO2-PIL+ broke down the barrier of biofilm. The results of HR-MS and zeta potential indicated that SiO2-PCe6-IL could change to positive (SiO2-PIL+) in acidic environment. The interaction forces and morphology results proved that the SiO2-PIL+ had a higher affinity to biofilm and could destroy the biofilm structure. Then, the photosensitizer was enriched in biofilm at sites of infection. The in vitro and in vivo experiments showed that SiO2-PCe6-IL could effectively eradicate oral biofilm infections and control of dental caries.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 7
·4876-4894
·
IF 4.682
Liu Hongxu,Xie Junhao,Zhao Jingxuan,Xue Peng,Lv Xue,Sun Shulin
With the rapid development of industrial technology, wastewater pollution has gradually become an important social issue and severely affects sustainable development. Polymer membranes separation technology provides an effective way for industrial wastewater treatment. Herein, 1-butyl-3-vinylimidazole bromide ionic-liquid grafted poly(vinylidene fluoride) (PVDF-g-IL) were prepared by irradiation-induced radical grafting method. The corresponding PVDF-g-IL films were prepared by non-solvent-induced phase separation method and were used to separate dye and emulsion wastewater for the first time. The results indicated that the grafted IL improved the hydrophilicity, porosity and average pore size, water flux, oil resistance, and anti-pollution ability of PVDF films. The PVDF-g-IL membranes exhibit splendid filtration performance for cationic dyes and emulsion wastewater, and the best one can achieve over 98% rejection and nearly 100% flow recovery. This research provides a simple and effective membrane preparation strategy for PVDF-based functional membranes and which behave as potential application prospects in dyes wastewater and oil–water emulsions purification field.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 18
·8855-8862
·
IF 3.925
Yabing Tian,Chen Xing,Wenxiang Wang,Shiguo Zhang,Yan Zhang
Pd-catalyzed Suzuki–Miyaura cross-coupling reactions have attracted considerable attention. Porous organic polymers (POPs) are potential heterogeneous catalysts to overcome the shortcomings of the homogeneous reaction. However, most POPs are microporous, which strongly hindered the mass transfer process during the catalytic reaction. In this work, a Pd-containing, highly crosslinked, mesoporous poly(ionic liquid) (SMPIL–Pd) was designed as a heterogeneous catalyst for efficient Suzuki–Miyaura coupling reactions. This catalyst was fabricated by hyper-crosslinking of a salen-containing mesoporous poly(ionic liquid) via a simple Friedel–Crafts alkylation reaction followed by Pd(II) coordination via the –N2O2– tetradentate structure of the salen structure. A series of characterization studies revealed that SMPIL–Pd possesses predominant porosity and extremely rigid networks, highly dispersed catalytic active sites, mesoporous structures, and large specific surface areas. Consequently, this catalyst exhibited excellent catalytic activity towards Suzuki–Miyaura coupling reactions under an air atmosphere in 50% aqueous ethanol. SMPIL–Pd also demonstrated outstanding stability and recyclability, and it can be reused seven cycles without a significant loss of activity.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 22
·5121-5133
·
IF 6.813
Guoqiang Zhang,Zhongqiu Liu,Yinuo Li,Yuanyuan Yu,Yujing Liu,Anguo Ying
Solid strong bases have attracted great research interest because of their excellent catalytic performance in the valorization of lignin into monocyclic aromatic compounds (MCACs). However, the high catalytic efficiency of solid strong bases for obtaining lignin-based MCACs is weakened due to the leaching and deactivation of basic sites caused by H2O formed in the reaction. More importantly, the precise fabrication of solid strong bases with ordered porous and unique hydrophobicity remains a grand challenge for the development of heterogeneous catalysts. Herein, novel multifunctional poly(ionic liquid)s (MFPILs) with Brønsted–Lewis dibasic sites, well-defined mesoporous channels, and hydrophobicity were successfully fabricated by a regulation-induced copolymerization. In addition, MFPILs show better catalytic performance with 21.99 wt% yield of lignin-based MCACs. The efficient catalytic properties of MFPILs for the directional valorization of lignin into MCACs are attributed to the synergistic catalysis, i.e., the mesoporous confinement, the sequence effect of Brønsted–Lewis dibasic sites on the transfer of active hydrogen, and hydrophobicity. This work not only has a certain guiding significance for the development of novel solid bases, but also provides an efficient catalytic strategy for producing lignin-based MCACs by co-catalysis.
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高影响因子
IONICS
·
2022
·Vol. 28
·期 9
·4103-4110
·
IF 2.961
Liu Hui,Zhu Weichen,Zhou Hongyan,Wang Jianzhong
The development of dual-ion metal-free batteries is restricted by the strong self-discharge effect and dissolution of some anode active materials in the polar electrolyte. This in turn leads to low coulombic efficiency and discharge capacity loss. It is of great significance to alleviate this phenomenon through the redox reactions of polymeric active materials. In this study, a metal-free poly(anthraquinonyl sulfide)-graphite battery was constructed based on a pure N -butyl- N -methylpiperidinium bis(trifluoromethylsulfonyl)imide ionic liquid electrolyte. The cell had a discharge capacity of 70.5 mAh g −1 (0.1 C) and a capacity retention rate of 98.6% after 100 cycles, with a coulombic efficiency of 98.3% (1 C). Comparative studies proved that the self-discharge effect of poly(anthraquinonyl sulfide)-graphite batteries is weaker than that of some dual-graphite batteries. Cyclic voltammetry experiments revealed that the redox reaction was highly reversible. Most significantly, this type of poly(anthraquinonyl sulfide)-graphite batteries provides a new way for the design of metal-free dual-ion batteries with excellent long-term cycling performance and minimal self-discharge effect. Graphical abstract
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 98
·期 1
·129-139
·
IF 3.709
Yajuan Wang,Wenqiang Liu,Jiangxin Li,Juan Zhang
Background Chinese research on citrate is typically into plasticizer alternatives to the carcinogenic phthalate (PAEs) plasticizers. PAEs plasticizers can induce obesity and metabolic disorders, whereas citric acid vinegar plasticizers have the advantages of low biological toxicity and environmental friendliness. Results Novel porous macromolecule oxazine poly-ionic liquid solid acid catalysts were prepared and characterized by scanning electron microscopy (SEM), Brunner−Emmet−Teller(BET) measurements, Fourier transform infrared spectroscopy (FTIR), energy dispersive spectrometer (EDS) and thermogravimetric analysis (TGA). Characterization results showed that the synthesized catalyst was a porous polymer with good heat stability. The catalytic performance of the catalyst was evaluated by synthesis of tributyl citrate from citric acid and n -butanol. Conclusion The optimal reaction conditions were determined as 9% (wt%) citrate mass. The experimental results showed that the optimal reaction conditions were determined as amount of catalyst 9% (wt% citrate mass), 150 °C reaction temperature, 3.5 h reaction time and 1:3 ratio of citric acid and n -butanol. Under optimal conditions, the conversion rate of citrate acid was ≤91.74%. The catalytic activity did not reduce obviously after being reused for ten times. Then, the reaction conditions were fited by the surface optimization method. The fitted optimum conditions were as follows: 8.881% amount of catalyst (mass of citric acid), 148.259 °C reaction temperature, 3.331 h reaction time, 1:2.958 citric acid: n -butanol ratio; this gave a conversion rate of citric acid of ≤92.998%. The simulation results are in good agreement with the experimental results. © 2022 Society of Chemical Industry (SCI).
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