INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Shupanxiang Chen,Yining Chao,Junmin Wu,Huan Ye,Xiao Luo,Zhiwu Liang
In this study, an amine polycarboxylate ionic liquid with multiple absorption sites, named [P4442]2[IDA], was selected to synthesize a new type of solid adsorbent for CO2 capture with a modified clay mineral AT (attapulgite). A series of experiments of the synthesized adsorbents were performed using a TGA instrument at atmospheric pressure. Different [P4442]2[IDA] loadings and temperatures were evaluated in the CO2 adsorption process, and the maximal amount of CO2 adsorbed on the adsorbent was 1.531 mmol/g with [P4442]2[IDA] loading of 30% at a temperature of 303 K. Note that, after the [P4442]2[IDA] molecules were impregnated onto the modified AT carrier, the utilization efficiency of [P4442]2[IDA] increased nearly three times, compared with pure [P4442]2[IDA]; this result also indicates that the cost of CO2 capture by ionic liquid is reduced by this method. Moreover, multiple analysis methods were used to analyze the composition and the structure of the adsorbent. The experimental data obtained from the CO2 adsorption process were fitted by two different isotherm models and three different kinetic models; the excellent fit of the Freundlich isotherm model and Avrami’s kinetic model indicates that CO2 capture by this adsorbent is the process which dominated by chemical adsorption and coexists with physical adsorption. In addition, the amount of CO2 adsorbed was only little slightly reduced after ten cycles, exhibiting excellent cyclic adsorption performance which is due to the stability of the bond between the [P4442]2[IDA] molecules and the modified AT carrier, as well as the extremely low volatility of the ionic liquid.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Junyuan Hua,Xiaohua Ma,Wenhui Ji,Quan Li,Benqiao He,Zhenyu Cui,Xiaoping Liang,Feng Yan,Jianxin Li
Ionic liquids (ILs) based liquid-liquid extraction (LLE) is one of the most efficient and green techniques for mining Li from salt lake brines, however, the extraction mechanism still needs to be clarified. Here, tributyl phosphate (TBP) and four kinds of ILs were used as extractant/co-extractant for recovering Li from Mg 2+ /Li + aqueous solution. The extraction conditions including the IL selection, IL/TBP ratio, Li + concentration and Li + /Mg 2+ ratio were analyzed in detail. A Li + recovery of 65.3 % and Li + /Mg 2+ separation factor of 68.4 at the Li + /Mg 2+ ratio of 1/50 wt% were achieved. This high Li extraction efficiency and Li + /Mg 2+ selectivity were analyzed by in-situ FTIR and 31 P NMR, the results turned out that this is attributed to the strong interactions between Li + and TBP/[NTf 2 ] − , and much larger than that of Mg 2+ . This strong interaction facilitated the [C 4 mim] + cation in IL exchange with Li + between organic and aqueous phase that finish the extraction process, which was further proved by EDX and XPS results. Additionally, the binding energy of the extraction intermediates were calculated by density functional theory (DFT), and the most stable one is 3TBP•Li•H 2 O•NTf 2 , suggesting one H 2 O combined with Li + enter into the organic phase during the extraction. As a result, the Gibbs free energy of the extraction between Li + and ILs/TBP mixture can be obtained to be −132.2 kJ mol −1 . In summary, our work showed an in-depth understanding of the extraction mechanism and provides guidelines for the ionic liquids-based Li extraction process in the future.
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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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Polymers
·
2022
·Vol. 14
·期 10
·1950
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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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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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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 MATERIALS SCIENCE
·
2022
·Vol. 57
·期 7
·4876-4894
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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
OPTICAL MATERIALS
·
2021
·
IF 3.08
Yang Wang,Sheng Feng,Wei Wu,Yun Zhou,Zhiwei Ye,Xiaojun Dai,Xun Cao
In this article, we reported a method for synthesizing cluster-like NH 2 -MIL-125(Ti)/BiOBr (NMT/B) Z type heterojunction composite materials with different content by using ionic liquid as bromine source assisted solvothermal method. In visible light , the photocatalytic activity of the materials was analyzed by degradation of tetracycline. Characterize the prepared composite material by XRD , FTIR, SEM, TEM, XPS , UV–vis diffuse reflection spectra (DRS). The result proved that the NH2-MIL-125(Ti) (NMT) nanosheets were tightly loaded on the BiOBr surface. NMT/B composite materials showed higher catalytic activity than monomer materials. The removal rate of TC reached 88% in 90min, which was 3 times and 5.7 times that of the monomer NMT and BiOBr monomer materials, respectively. In the catalytic process, –O 2 - and h + are the main active substances that degrade pollutants. This is proved by free radical capture experiments. It could be inferred that the improved photocatalytic activity of NMT/B composites was contributed to the good energy band structure and the formation of Z-type heterojunctions in close contact, which greatly facilitates the photogenerated carrier and hole migration and dissociation. Cycle experiment proved that the prepared composite material has excellent stability, which indicated that it had a good prospect in practical applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xiangli Gao,Huan Liu,Jianbo Shuai,Junmeng Zhao,Guowen Zhou,Quanbo Huang,Hao Ling,Wenjiao Ge,Xiaohui Wang
Cellulose acetate (CA) is one of the most important cellulose plastics that has demonstrated extensive applications in many areas. In search of a more sustainable and efficient way to prepare CA, we synthesized a novel ionic liquid , [DBUC 8 ]Cl, based on the commonly used catalyst DBU (1,8-diazabicyclo[5.4.0]undecyquin-7-ene) in a simple manner. [DBUC 8 ]Cl can dissolve cellulose more efficiently than the same type of imidazolyl ionic liquid, owing to the stronger alkalinity of DBU. It is noteworthy that highly substituted CA (DS = 2.82) was successfully synthesized via transesterification with alkenyl ester under mild conditions (80 °C, 40 min) without the addition of a catalyst in this solvent, which is superior to most of the reported work. Furthermore, we confirmed that the synthesized CA had good thermoplasticity, and a transparent cellulose acetate film (CAF) was obtained by hot pressing with a small amount of glycerol. Therefore, we propose a new DBU-derived ionic liquid, which may serve as a versatile platform system for producing cellulose-derived bioplastics more sustainably and efficiently.
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Biotechnology for Biofuels and Bioproducts
·
2023
·Vol. 16
·期 1
·1-10
·
IF 0
Zhang Hanxiao,Li Yan,Zhuang Jing,Dai Jianying,Xiu Zhi-Long,Quan Chunshan
Background The development of biofuels, especially liquid hydrocarbon fuels, has been widely concerned due to the depletion of fossil resources. In order to obtain fuel precursors, the reaction of C–C bond formation is usually carried out with biomass derived ketones/aldehydes as reactants. Acetoin and 2,3-butanediol are two platform chemicals, which are co-existed in fermentation broth and traditionally separated by distillation, and then acetoin could be use as C4 building block to prepare hydrocarbon fuels. In order to mitigate the process complexity, direct aldol condensation reaction of acetoin in fermentation broth was studied in this work. Results A one-pot process of product separation and acetoin derivative synthesis was proposed based on salting-out extraction (SOE). Aldol condensation reaction of acetoin and 5-methyl furfural in different SOE systems was compared, and the results showed that the synthesis of C 10 fuel precursors and separation of C 10 products and 2,3-butanediol from fermentation broth were achieved in one-pot with ethanolammonium butyrate (EOAB) and K 2 HPO 4 as SOE reagents and catalysts. The SOE and reaction conditions such as the concentrations of EOAB and K 2 HPO 4 , reaction temperature and time were optimized. When the system was composed of 6 wt% EOAB-44 wt% K 2 HPO 4 and the mixture was stirred for 6 h at 200 rpm, 40 ℃, the yield of C 10 products was 80.7%, and 95.5% 2,3-butanediol was distributed to the top EOAB-rich phase. The exploration of reaction mechanism showed that an imine intermediate was rapidly formed and the subsequent C 10 product formation was the key step for aldol condensation reaction. Conclusions With EOAB and K 2 HPO 4 as SOE reagents and catalysts, one-pot synthesis of fuel precursor from acetoin fermentation broth was achieved without prior purification. A yield of 80.7% for C 10 products was obtained which was accumulated at the interface of two aqueous-phase, and 95.5% 2,3-BD was distributed to the top EOAB-rich phase. This work provides a new integration process of product separation and derivative synthesis from fermentation broth based on ionic liquid SOE. Graphical Abstract
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Haiyan Du,Nan Zhang,Jinfeng Wang,Feng You
The aim of this work is to fabricate the stretchable, redox-driven shape memory, and self-healable gels sensors using one-step self-assembling method at ambient temperature. The mixed aqueous solution of poly (vinyl alcohol) (PVA), ionic liquid (IL, 1-butyl-3-methylimidazolium tetrafluoroborate), and phytic acid (PA) can transfer to PVA/IL/PA gels due to the multiple hydrogen bonds and electrostatic interaction among the three different molecules. The gel exhibits outstanding redox-driven shape memory fixity in trivalent iron ion solution and reversible recovery in ascorbic acid solution, respectively. The reversible breakage and recombination of hydrogen bonds and electrostatic interaction endows the PVA/IL/PA gels excellent mechanical properties and self-healing effect. The optimum tensile strength and elongation at break ( EB ) of gels are 1.56 MPa and 368%, respectively. The EB and self-healing efficiency of the healed gel can reach up to 161.91% and 74%, which are competitive in ion gels. Moreover, the gel can be used as flexible strain sensors, which exhibit good performance in monitoring human activities and voice recognition. This study will provide one green and universal approach in fabricating multi-functional gels, which show promising applications in the field of tissue engineering, sensors and actuators, and soft electronic materials etc.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Qiang Liu,Siming Zhu
This study proposes a novel and feasible dissolution and fractionation method of depectinated sugar beet pulp (SBP) in NaOH/Urea/H 2 O, ionic liquid (IL) and alkaline treatment processes. Interestingly, the complicated structure of SBP can be treated with 30 % H 2 SO 4 to increase the dissolution rate. Scanning electron microscope (SEM) analysis confirmed that the appearance of cellulose and hemicellulose obtained by two methods were different. At the same time, two lignin fractions showed irregular high-density clusters, which were composed of a large number of submicron particles. The crystal structure of two cellulose fractions changed from cellulose I to cellulose II. The thermal stability of cellulose and lignin obtained by ionic liquid was slightly better than that obtained by NaOH/urea/H 2 O. Results of Fourier transform infrared (FTIR) and 13 C NMR showed that the chemical structures of SBP cellulose, hemicellulose and lignin regenerated from NaOH/urea/H 2 O and ionic liquid were similar.
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高影响因子
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