CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Bowen Jiang,Jia Liu,Guoqiang Yang,Zhibing Zhang
A novel series of halogen free, hydroxyl group containing poly(ionic liquid)s (PILs) was first synthesized from glycerol dimethyl acrylate (GDA) and 1-vinyl imidazole (1-VIM) through free radical polymerization , follow by an alkylation step and an ion-exchange procedure to form the final imidazolium hydrogen carbonate heterogenous catalyst poly(HCO 3 -OH- n ). The chemical and physical properties were investigated by varying the monomer ratio between GDA and 1-VIM. Among them, poly (HCO 3 -OH-2) exhibited the highest catalytic activity for CO 2 cycloaddition, with the yield of chloropropene carbonate 90% under mild conditions (80 °C, 0.1 MPa, 12 h, 0.15 g catalyst for 32 mmol epichlorohydrin) in the absence of any cocatalyst, metal or solvent. A range of substrates with good to excellent yields under atmosphere was obtained. The poly(HCO 3 -OH- n ) catalyst is collectable and still remains acceptable catalytic activity after six runs. Finally, a preliminary kinetic is calculated on the basis of poly(HCO 3 -OH-2) with the activation energy value of 79.5 kJ·mol −1 . This study highlights that the poly(HCO 3 -OH- n ) enable to reach efficient CO 2 conversion under mild conditions.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shuang Zheng,Shaojuan Zeng,Guilin Li,Xiaoqian Yao,Zhengchen Li,Xiangping Zhang
Effective capture of trace CO 2 in atmosphere or confined spaces to ensure human beings safety draw a lot of attention, however, how to simultaneously improve CO 2 capacity and selectivity still faces great challenge. Herein, combining porous molecular sieves (SBA-15 and MCM-41) and the anion-functionalized ionic liquid (IL) tetraethylammonium glycinate ([N 2222 ][Gly]), a series of hierarchically porous IL composites with different IL loadings were designed and prepared. Compared with pristine supports, the incorporation of [N 2222 ][Gly] simultaneously improves CO 2 capacity and CO 2 /N 2 selectivity by orders of magnitude, especially for confined spaces (<5000 ppm) and air (415 ppm). When the IL loading was 60 wt%, novel micropores were created, especially ultra-micropores (<0.65 nm), which are not present in bare supports and other [N 2222 ][Gly]@SBA-15 (15, 30 and 45 wt%). Among them, 60 wt%[N 2222 ][Gly]@SBA-15 showed the highest CO 2 uptake of 1.45 and 1.88 mmolCO 2 /g-adsorbent at 0.0005 and 0.005 bar under 313 K along with recyclability, which are much superior to the state-of-the-art reported values. Moreover, superb ideal CO 2 /N 2 selectivity of 11,545 at 0.005 bar and 288 K was achieved, which was 288 times that of SBA-15. Meanwhile, mixed gas breakthrough experiments demonstrated that 60 wt% [N 2222 ][Gly]@SBA-15 shows outstanding CO 2 separation performance under simulative confined spaces and ambient air. The ultra-high CO 2 separation performance was attributed to the synergy of chemical interaction between the IL anion and CO 2 as well as newly created micro- and ultra-micropores effect. This work provides guidelines for the design of IL composites with ultra-micropores for efficient trace CO 2 removal.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Munir Hussain,Sohail Yasin,Amjad Ali,Zhiyun Li,Xinpeng Fan,Yihu Song,Qiang Zheng,Wanjie Wang
Ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate is used to explore the interactions between silica and rubber and replacement of silane for preparing volatile organic compounds-free vulcanizate nanocomposites. Herein we investigate the synergistic impact of IL on microscopic structure, nonlinear rheology and Mullins effect of silica filled nitrile butadiene rubber (NBR) nanocomposites. The results show that IL reacts with NBR chains and silica during compounding and vulcanization, which improves silica dispersion, bound rubber content and NBR crosslinking density and thus mediates the reinforcement and strain softening behaviors. In comparison with 5 phr usually used coupling agent bis(3-triethoxysilylpropyl)tetrasulfide, IL at the same amount could significantly improve tensile strength without influencing the dissipation energy of vulcanizates experiencing cyclic tensile deformation, which is enlightening for designing and producing vulcanizate nanocomposites with tailorable elasticity and dissipation behaviors.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
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.
✓ 已验证
产品关联
DOI
高影响因子
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.
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 6
·1657-1665
·
IF 2.936
Bian Yuhang,Liu Junyang,Zhang Guoliang,Peng Zhijian,Li Chunshan
Abstract High yield of methyl methacrylate was gained by using ionic liquid functionalized copolymer of ethylene dimethacrylate and 4-vinylbenzyl. The solid acid catalyst (VEM-ILs) was obtained through quaternary ammonization on the tetraethylenepentamine-functionalized copolymer with 1,3-propanesultone and HSO 3 CF 3 . The acid amount of VEM-ILs was 1.46 mmol/g. The surface area and pore volume of VEM-ILs were 11.1 m 2 /g and 0.04 cm 3 /g. To appraise the catalytic activity of the catalyst, the esterification between methacrylic acid and methanol was implemented. The optimized condition was as follows: 21.15 wt% catalyst dosage based on the weight of methacrylic acid, 90 °C, MAA to MeOH ratio of 1:1.5 and 3 h reaction time. Under the optimal condition, the yield of ester reached 76.5%. After four times use, the catalyst still exhibited a good catalytic effect.
Graphical Abstract
✓ 已验证
产品关联
DOI
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.
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Fatima-ezzahra Ettoumi,Ruyuan Zhang,Tarun Belwal,Miral Javed,Yanqun Xu,Li Li,Lv Weide,Zisheng Luo
Nanobubbles (NBs) generated-nanojets membrane poration have gained enormous attention. In this study, NBs were fabricated as a novel green approach to assist ionic liquid (IL) [C 4 C 1 im][BF 4 ] extraction of polyphenols from Carya cathayensis Sarg. husk. NBs were successfully generated with mean size of 85.47 ± 5 nm, zeta potential of +39 ± 2.24 mV, and concentration of 21.15 ± 0.75 × 10 8 particles/mL (stable for over 48 h in IL solution). Compared to common solutions extract, IL-NBs extract showed significantly higher ( p < 0.05) antioxidant activity and polyphenols yields with a total polyphenol, total flavonoid, and total tannins contents of 85.67 ± 2.05 mg GAE/g DW, 42.44 ± 1.17 mg CE/g DW, and 8.2 ± 0.05 mg TAE/g DW, respectively. The SEM results confirmed that NBs’ nanojets caused morphological destruction of the husk powder. Overall, IL-NBs solution showed better extraction efficiency of polyphenols than other solutions, giving insight into a new “green” nanotechnology-based extraction method.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2021
·
IF 2.917
Ai-min LIU,Yu YAO,Meng-xia GUO,Yu-bao LIU,Zhong-ning SHI,Feng-guo LIU,Xian-wei HU,Wen-cai HE,Zhao-wen WANG
The density, conductivity, and viscosity of the 1,3-dimethyl-2-imidazolinone and lithium nitrate (DMI– LiNO 3 ) solvated ionic liquid were measured as a function of temperature. Additionally, the electrochemical mechanism and electrodeposition of neodymium from the DMI–LiNO 3 solvated ionic liquid were investigated. Cyclic voltammetry results indicate that the electrochemical reduction of Nd(III) is irreversible and proceeds via one-step with three-electron transfer, which is controlled by diffusion with a diffusion coefficient of 5.08×10 −8 cm 2 /s. Energy- dispersive X-ray spectrometry and X-ray photoelectron spectroscopy data confirm that the electrodeposit obtained after electrodeposition at −4 V (vs Ag) using the DMI–LiNO 3 –Nd(CF 3 SO 3 ) 3 solvated ionic liquid contains metallic neodymium.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Zhaomin Wang,Fanming Zeng,Dongyu Zhang,Xinyu Wang,Weiling Yang,Yong Cheng,Chun Li,Limin Wang
Antimony anode has attracted increasing attention with its suitable voltage platform and high theoretical capacity. Nonetheless, its actual application is largely hindered by the capacity loss due to the volume effect during the cyclic process. Herein, A novel polyhedral structure nitrogen and carbon doped Sb/Sb 2 O 3 (Sb/Sb 2 O 3 -NC) nanoparticles are designed via a liquid phase reaction approach followed by a thermal treatment process. The nanocomposite anode used for lithium-ion batteries (LIBs) delivers a reversible specific capacity as high as 460 mAh g −1 after 100 cycles at 2 A g −1 and excellent rate performance of 353 mAh g −1 at 10 A g −1 . In addition, at a current density of 500 mA g −1 , Sb/Sb 2 O 3 -NC exhibits a capacity of 318 mAh g −1 after 100 cycles and excellent rate performance of 183 mAh g −1 at 2 A g −1 for sodium-ion batteries (SIBs). The results suggest that the polyhedral Sb/Sb 2 O 3 -NC could be a potential candidate as anode material for LIBs and SIBs.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Qiao Yang,Jingcheng Hao
Metal sulfide nanomaterials have been extensively studied due to their attractive applications in various fields. Although various synthetic approaches have been developed, it remains a great challenge to establish a universal and green method for fabricating metal sulfide nanomaterials with tailorable structures (e.g., shapes and sizes). Here we report a ionothermal strategy to synthesize metal sulfide particles with diverse components and controllable architectures. Transition metal sulfide (TMS) nanostructures such as hierarchical Cu 7 S 4 microspheres , ZnS and CdS nanoparticles , PdS polyhedrons, and Bi 2 S 3 nanorods have been successfully synthesized with metal salts and amino acid-based ionic liquids , [TBP][Cys] (tetrabutyl-phosphonium cation and L -cysteine anion). We unveiled the structures, optical properties , and formation mechanism of TMSs. As a typical application of the as-prepared TMSs, the hierarchically structured Cu 7 S 4 nanocrystals enable high-performance photocatalysis degradation of dyes (e.g., methylene blue) in water. Our study not only provides new insights into the ionic liquid-mediated assembly strategy but also achieves an efficient catalyst for photocatalytic degradation.
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Rongrong Wang,Xirong Huang
The hydrophobic ionic liquid [C8mim][PF6] (1-octyl-3-methylimidazolium hexafluorophosphate)-based bicontinuous microemulsion stabilized by the anionic surfactant [C4mim][AOT] (1-butyl-3-methylimidazolium bis(2-ethylhexyl) sulfosuccinate) was first tried as a medium for horseradish peroxidase (HRP)-triggered oxidative polymerization of aniline. The effects of the mass ratio of [C8mim][PF6]-to-water (α), the mass fraction of [C4mim][AOT] in the total mixture (γ), and temperature (T) on the enzymatic polymerization were investigated using UV–vis–NIR absorption, electron spin resonance, and small-angle X-ray scattering spectroscopy techniques. The bicontinuous microemulsion is demonstrated to play a template role in the biosynthesis of polyaniline (PANI). The conductivity of the resulting PANI depends on the microemulsion microstructure and the microstructure- and T-dependent catalytic properties of the solubilized HRP. With the increase in α, the conductivity of the synthesized PANI decreases due to the increase in the template curvature (decrease of the microdomain size) and the decrease in the activity and stability of HRP. Compared with α, γ has little effect on the microdomain size of the template; so, the γ-dependent change in the conductivity of PANI is mainly caused by the changes of the microstructure-dependent activity and stability of HRP. Over the range of 20–35 °C, T has little effect on the microdomain size, but it greatly changes the activity and stability of HRP. With the increase in T, the activity of HRP increases steadily, but its stability decreases significantly, which should be one of the reasons why the conductivity of PANI decreases with increasing T. In conclusion, lower values of α, γ, and T are favorable for the biosynthesis of conductive PANI. The present study not only deepens the insight into the role of the template in the process of PANI synthesis, but also opens up a green new way for the biosynthesis of the conducting polymer.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）