NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 17
·7659-7670
·
IF 3.591
Kangjun Xie,Zhen Dong,Nan Wang,Wei Qi,Long Zhao
The selective elimination of radioactive TcO4− from radioactive waste is becoming increasingly critical for environmental security. In this work, a series of novel adsorbents (Si-IL-X, X = NO3, Cl, BF4, NTf2) modified with ionic liquids containing different anions (X) were synthesized via radiation grafting of 1-vinyl-3-ethylimidazolium tetrafluoroborate onto silanized silica and subsequent anion replacement. The surface and structural properties of the prepared adsorbents were characterized by FT-IR spectroscopy, TGA, XPS, and SEM-EDS. Subsequently, their adsorption properties for ReO4− (a nonradioactive surrogate of TcO4−) were studied in detail via batch and column experiments. The batch experiments indicated that the Si-IL-X showed high ReO4− removal efficiency over a broad pH range of 3–10, and their maximum adsorption capacities were in the range of 147.93–289.02 mg g−1 against ReO4−. It was found that the adsorption ability of Si-IL-X was related to the anion structure of the ionic liquid, and the order was Si-IL-NO3 > Si-IL-Cl > Si-IL-BF4 > Si-IL-NTf2, which was mainly determined by the hydrophilicity and ionic radius of the anions. Besides, their adsorption capacities barely decreased after electron beam radiation of 800 kGy. In column experiments, the adsorbents exhibited excellent selectivity and could capture ReO4− efficiently from simulated radioactive wastewater containing a large number of coexisting ions. In addition, the XPS and FT-IR spectroscopic analyses indicated that adsorption was carried out by an ion-exchange process. The results suggested that Si-IL-X showed excellent application prospect for efficient capture of TcO4− from Hanford waste and other common acidic radioactive wastes.
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CATALYSIS LETTERS
·
2021
·Vol. 151
·期 12
·3523-3531
·
IF 3.186
Bian Yuhang,Shan Qingwen,Guo Changchang,Liu Chaozheng,Zhang Juan
High biodiesel yield was obtained by using poly (acidic ionic liquid)s. The ionic liquid monomer was synthesized through quaternary ammonization on the N,N-Dimethyl-3-aminophenol with 1,3-propanesultone and p-Hydroxybenzenesulfonic acid. The IL monomer and formaldehyde was used to synthesize the poly(acidic ionic liquid)s. Several physicochemical techniques were used in the characterization of this poly(acidic ionic liquid)s. The esterification of oleic acid and methanol was used to investigate the catalytic activity of the synthesized catalyst. In order to obtain the maximum yield, four parameters (reaction time, amount of methanol, temperature and catalyst amount) were considered. In the optimum condition (5 wt% catalyst amount, 9:1 methanol/oleic acid ratio at 80 °C for 1.5 h), the ester yield was up to 93.3%. After four cycles of use, the catalytic activity of FCPIL did not exhibit significant decline. Graphic Abstract
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Yibin Yang,He Zhou,Yao Xiao,Li Feng,Lijun Yang,Wenyun Mu,Xiaoyan Peng,Lixia Bao,Jiliang Wang
It is still a big challenge to obtain hydrophobic thermoplastic starch with outstanding mechanical performance due to the inevitable usage of typical hydrophilic plasticizers like glycerol during processing. Herein, we report a novel hydrophobic thermoplastic starch using a supramolecularly induced thermoplasticization technique. To achieve this aim, a functional sucrose-based ionic liquid crystal (ILC) including numerous chloride atoms has been firstly synthesized, and the obtained ILC molecules are then used as supramolecular inducers to thermoplasticize corn starch granules. Thermoplasticity and hydrophobicity of the prepared supramolecularly induced thermoplastic starch (STPS) with different ILC contents have been extensively investigated. Mechanism of the supramolecularly induced thermoplasticization has been investigated using molecular simulation as well. The prepared STPS with the maximum tensile strength of 8.4 MPa and water contact angle of about 117° show large potential applications in green and sustainable packaging materials.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Bo-Yun Liu,Min-Jie Chen,Liang Yang,Bo Zhao,Tao Xia,Gang-Gang Chang
The engineering of highly efficient and stable heterogeneous catalysts for catalytic conversion of CO 2 to high value-added products is highly desirable but presents a great challenge. Herein, we reported the synthesis of a series of multifunctional IL@H-Zn/Co-ZIF composite catalysts with a unique porous hollow capsule structure and encapsulated amino-functionalized ionic liquids (ILs). The unique hollow capsule structure of IL@H-Zn/Co-ZIF provides sufficient space for loading active ILs ([C 2 NH 2 Mim + ][Br − ]) and fast mass transfer of substrate molecules during catalysis. Furthermore, the microporous Zn-ZIF shell can effectively avoid the leaching of active ILs. Benefiting from the unique hollow structure, the resultant IL@H-Zn/Co-ZIF demonstrated excellent catalytic performance (>95% yield), and good recyclability (still remained about 90% activities after 5 cycles) when applied in the CO 2 cycloaddition reaction under solvent and co-catalyst free conditions.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 39
·期 5
·537-544
·
IF 3.154
Lv Xiao-Jing,Xu Li-Bin,Qian Liang,Yang Yuan-Yuan,Xu Zhi-Yi,Li Jin,Zhang Cheng
An imidazolium-based ionic liquid (IL) modified triphenylamine derivative, namely 1-(4-((4-(diphenylamino)benzoyl) oxy)butyl)-3-methyl imidazole tetrafluoroborate (TPAC 6 IL-BF 4 ), was designed and synthesized, and further applied with 3,4-ethylene dioxythiophene (EDOT) to prepare conjugated copolymer P(EDOT:TPAC 6 IL-BF 4 ) via electrochemical polymerization. The cyclic voltammetry curves show that the copolymer P(EDOT:TPAC 6 IL-BF 4 ) possesses two pairs of redox peaks, which should be ascribed to the redox behaviors of EDOT and triphenylamine. The ultraviolet-visible (UV-Vis) absorption spectrum of P(EDOT:TPAC 6 IL-BF 4 ) exhibits one maximum absorption peak at 580 nm and a small shoulder characteristic peak at 385 nm under neutral state which are assigned to π-π * conjugated structure of EDOT and triphenylamine. After being applied at the positive voltage, the copolymer color changes from dark blue to light blue, which is close to the color of poly(3,4-ethylenedioxythiophene) (PEDOT). Surprisingly, the copolymer P(EDOT:TPAC 6 IL-BF 4 ) shows shorter switching time of 0.37 s, 0.30 s at 580 nm and 0.38 s, 0.45 s at 1100 nm compared with PEDOT. It is more intriguing that the copolymer P(EDOT:TPAC 6 IL-BF 4 ) exhibits electrochromism even in free supporting electrolyte. The results confirm that the existence of imidazolium-based ionic liquid has an improvement on the ion diffusion properties and the switching time of conjugated polymer, which may provide a potential direction for the preparation of high-performance electrochromic materials.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2020
·
IF 2.615
Ai-min LIU,Meng-xia GUO,Zi-yang LÜ,Bao-guo ZHANG,Feng-guo LIU,Wen-ju TAO,You-jian YANG,Xian-wei HU,Zhao-wen WANG,Yu-bao LIU,Zhong-ning SHI
To investigate the electrochemical reduction mechanism of Ta(V) in ethylene carbonate and aluminum chloride (EC−AlCl 3 ) solvate ionic liquid, cyclic voltammetry experiments were conducted on a tungsten working electrode. Four reduction peaks were observed in the cyclic voltammogram of the EC−AlCl 3 −TaCl 5 ionic liquid. The reduction peaks at −0.55, −0.72, and −1.12 V (vs Al) were related to the reduction of Ta(V) to tantalum metal by three stages including the formation of Ta(IV) and Ta(III) complex ions. The reduction of Ta(III) to tantalum metal was an irreversible diffusion-controlled reaction with a diffusion coefficient of 3.7×10 −7 cm 2 /s at 323 K, and the diffusion activation energy was 77 kJ/mol. Moreover, the cathode products at 323 K were characterized by scanning electron microscopy, energy-dispersive spectroscopy, and X-ray photoelectron spectroscopy. The results showed that tantalum metal and tantalum oxides were obtained by potentiostatic electrodeposition at −0.8 V for 2 h.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Bin Jiang,Shuai Hou,Luhong Zhang,Na Yang,Na Zhang,Xiaoming Xiao,Xiaodong Yang,Yongli Sun,Xiaowei Tantai
Ionic liquids (ILs) as promising absorbents for SO2 capture in flue gas desulfurization have been extensively studied. In this work, a multisite absorption strategy was used to synthesize ether-linked diamine protic ionic liquids (EDPILs) for efficient SO2 capture. The prepared EDPILs containing ether-linkage chain exhibited superior SO2 absorption relative to conventional protic ionic liquids (PILs). Density functional theory calculations demonstrated that the ether-linkage chain intensified the physical interaction between EDPILs and SO2. In a subsequent experiment, bis(2-dimethylaminoethyl) ether dilactate [BDMAEE][L]2, which possessed outstanding SO2 capture capacities, was used to prepare aqueous solutions (aq), which reduced viscosity of PILs and improved their applicability. An in-depth assessment of the desulfurization performance of [BDMAEE][L]2 aq revealed that effective SO2 absorption can be achieved even at relatively low concentrations. Specifically, 50 wt % [BDMAEE][L]2 aq exhibited a high absorption capacity (1.04 molSO2/molILs, 0.097 gSO2/gabsorbents) as well as a high SO2/CO2 selectivity at 0.2 vol % SO2 and 40 °C. Overall, ether-linked absorbents with improved desulfurization performance (high SO2 absorption capacity, satisfactory SO2 removal efficiency, and excellent reusability) possess good application prospects in flue gas desulfurization.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Fan Liu,Yao Shen,Li Shen,Cheng Sun,Liang Chen,Qiaoli Wang,Sujing Li,Wei Li
To achieve low regeneration energy consumption and viscosity, a novel amino-functionalized ionic liquid [TEPAH][2-MI] combined with organic solvents has been proposed for CO2 capture in this work. The results demonstrated that the absorption loading of [TEPAH][2-MI]/N-propanol (NPA)/ethylene glycol (EG) was 1.72 mol·mol–1 (28 wt %, 257 g·L–1), which was much higher than that of monoethanolamine/water, and the regeneration efficiency was maintained at 90.7% after the fifth regeneration cycle. The viscosities of the solution were only 3.66 and 7.65 mPa·s before and after absorption, respectively, which were significantly lower than those of traditional nonaqueous absorbents. The reaction mechanism investigated via 13C NMR and quantum calculations summarized that CO2 first reacted with the amino group of [TEPAH]+ to form the carbamates through the zwitterion formation and protonation process, while CO2 reacted with the N atom of [2-MI]− to directly form the carbamate. Then, some of them further reacted with NPA and EG to form the carbonates. Moreover, Nπ and Nτ tautomers of [TEPAH][2-MI] could convert into each other continuously when CO2 was absorbed. During CO2 desorption, the carbamates and carbonates reacted with AFILH+ to decompose and released CO2 directly.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 8
·1765-1775
·
IF 2.578
Caixia Li,Chao Ma,Juan Li
Because of good thermal stability, nonflammability and rich structural designability, ionic liquids (ILs) have been used as flame retardants for poly(lactic acid) (PLA). However, as a small molecule, IL has the disadvantages of poor thermal stability and water resistance, and so on. In this paper, an imidazole-type poly(ionic liquid) (PIL) containing a phosphate anion was synthesized using 1-vinylimidazole, triethyl phosphate, and 1,2-divinylbenzene and marked as PDVE[DEP]. The PDVE[DEP] was used to improve the flame retardancy of PLA. The flame retardancy and thermal degradation behaviors of PLA/PDVE[DEP] composites were investigated by the limited oxygen index (LOI), UL-94 vertical burning, cone calorimetry, and thermal gravity analysis, and so on. The results showed that only 1.0 wt% PDVE[DEP] allows PLA to achieve the UL-94 V0 rating and obtain LOI value 25.6 vol%. The PDVE[DEP] improve the flame retardancy of PLA by melting-away mode. In addition, it catalyzes the transesterification of PLA and changes the degradation products.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 16
·6428-6434
·
IF 3.288
Chang Dong,Yijia Yu,Xiaoling Zhang,Liyan Huang,Ying Wu,Jun Li,Zhengping Liu
Ionic liquids (ILs) with wide electrochemical windows are increasingly used as electrolytes to improve the energy density of graphene-based supercapacitors. However, due to irreversible agglomeration during the reduction of graphene oxide (GO) to reduced graphene oxide (RGO) and less compatibility between the IL electrolyte and RGO, RGO-based electrode materials in an IL electrolyte usually exhibit poor electrochemical properties. To address these issues, we chose an ionic liquid with a similar structure to the electrolyte as a modifier and fabricated reduced graphene oxide composites modified with the chosen ionic liquid (RGO–IL) by a hydrothermal method. The integration of ILs with RGO could prevent the aggregation and restacking of GO layers and improve the compatibility between the RGO–IL electrode and IL electrolyte. The symmetrical supercapacitor assembled using the obtained RGO–IL2 electrode material showed an outstanding energy density (50.19 W h kg−1 at 0.75 kW kg−1) and excellent cycle performance (87.23% retention of the original value after 2000 cycles at 5 A g−1) in the IL electrolyte. These superior performances make RGO–IL composites one of the apposite choices of electrode materials for supercapacitors.
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JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Binyu He,Huawen Peng,Yang Chen,Qiang Zhao
An imidazolium ionic liquid (1-aminoethyl-3-methylimidazolium bromide, AMIB) was exploited to prepare thin film composite membranes (TFCMs) exhibiting high water permeability, salt rejection, antibiotics separation and antibacterial properties. Polyamide TFCMs were prepared by “piperzine ~ trimesoyl chloride” (PIP-TMC) interfacial polymerization. AMIB molecules were anchored to membrane surface through “acyl chloride ~ amine” amidation. Salt rejection and water flux of the modified membrane (PIP-TMC-AMIB) was 95 ± 1% (R Na2SO4 ) and 135 ± 5 L m −2 h −1 at 6 bar pressure. Thus the permeance of the modified TFCM is ~ 4 times as high as that of lab-made pristine PIP-TMC TFCM. The PIP-TMC-AMIB membrane shows high water permeance (~ 25 Lm −2 h −1 bar) and effective rejection (>90%) toward antibiotics such as 50 ppm ciprofloxacin, tetracycline, oxytetracycline, levofloxacin and erythrocin. In addition, the membrane exhibits effective separation of antibiotics/sodium chloride mixtures, and highly improved antibacterial properties by killing 99% E. coli colonies.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2019
·Vol. 20
·期 24
·6198
·
IF 4.183
Fang Wang,Chong Xie,Liying Qian,Beihai He,Junrong Li
Electro-actuated polymer (EAP) can change its shape or volume under the action of an external electric field and shows similar behavioral characteristics with those of biological muscles, and so it has good application prospects in aerospace, bionic robots, and other fields. The properties of cellulose-based electroactive materials are similar to ionic EAP materials, although they have higher Young’s modulus and lower energy consumption. However, cellulose-based electroactive materials have a more obvious deficiency—their actuation performance is often more significantly affected by ambient humidity due to the hygroscopicity caused by the strong hydrophilic structure of cellulose itself. Compared with cellulose, chitosan has good film-forming and water retention properties, and its compatibility with cellulose is very excellent. In this study, a chitosan/cellulose composite film doped with ionic liquid, 1-ethyl-3-methylimidazolium acetate ([EMIM]Ac), was prepared by co-dissolution and regeneration process using [EMIM]Ac as the solvent. After that, a conductive polymer, poly(3,4-ethylenedioxythiophene)/poly (styrene sulfonate) (PEDOT: PSS), was deposited on the surface of the resulted composite, and then a kind of cellulose-based electroactive composites were obtained. The results showed that the end bending deformation amplitude of the resulted material was increased by 2.3 times higher than that of the pure cellulose film under the same conditions, and the maximum deformation amplitude reached 7.3 mm. The tensile strength of the chitosan/cellulose composite film was 53.68% higher than that of the cellulose film, and the Young’s modulus was increased by 72.52%. Furthermore, in comparison with the pure cellulose film, the water retention of the composite film increased and the water absorption rate decreased obviously, which meant that the resistance of the material to changes in environmental humidity was greatly improved.Keywords:electroactive materials;electroactive properties;chitosan/cellulose composite film;[EMIM] Ac;mechanical properties
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