ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2020
·Vol. 412
·期 13
·3063-3071
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IF 3.637
Li Hongmei,Yue Xiaxia,Gao Ningning,Tang Jun,Lv Xiaoyi,Hou Junwei
Clopidol is one of the most widely used anti-coccidiosis drugs. Its residues in poultry products and the environment pose a serious threat to human health. In this work, microwave-assisted synthesis of magnetic ionic liquid/gold nanoparticles (MIL-Au NPs) as the SERS substrates were first designed for sensitive and reliable determination of clopidol residue in egg samples. The experiment shows that MIL(1-methyl-3-hexyl imidazole ferric tetrachloride ([C 6 mim]FeCl 4 )) and microwave play a key role in the dispersion and morphology of Au NPs. Under the optimal conditions, the as-prepared MIL-Au NPs were applied to the SERS detection of clopidol in methanol and egg solution and its detection limits can be as low as to 0.5 μg/kg (equal to 0.5 ppb) in both solutions. The standard curves with regression coefficients of 0.9298 and 0.93496 were constructed in the linear range of 100–1000 ppb and 0.5–50 ppb for clopidol in egg solutions. Moreover, satisfactory recoveries (97.5–103.2%) were obtained for egg samples. The developed SERS method provides a way for quantitation of clopidol and can be applied for the convenient, reliable, and highly sensitive detection of antibiotic residues in food and environment, which has great potential in food safety and biological monitoring.
Graphical abstract
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Mengran Lou,Ruiying Wang,Lili Yang,Dianzeng Jia,Zhipeng Sun,Luxiang Wang,Yong Guo,Xingchao Wang,Jie Zhang,Hongli Shi
Direct formic acid fuel cells have great application potential in the energy field, but their commercialization is hindered by the CO poisoning and low performance of Pd-based anode catalysts. In this study, novel composite catalysts composed of Pd, organic-inorganic hybrid imidazole ionic liquid polyoxometalates, and N,P-codoped coal-based carbon fibers with good dispersion and smaller Pd nanoparticles were synthesized successfully. Physical and electrochemical characterizations revealed that the as-prepared Pd-based composite catalysts have excellent CO poisoning resistance and enhanced electrocatalytic activity in formic acid electrooxidation. Notably, the CO oxidation onset potential of a catalyst modified by imidazole ionic liquid polyoxometalate with long alkyl chain was 0.1 V lower than that of the unmodified catalyst. The mass activity of the as-prepared Pd catalyst in formic acid oxidation was 754.1 mA mg −1 Pd . It is expected that organic-inorganic hybrid polyoxometalates can be further applied to fuel cell catalysts.
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NATURE MATERIALS
·
2020
·Vol. 19
·期 5
·552-558
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IF 38.663
Bi Sheng,Banda Harish,Chen Ming,Niu Liang,Chen Mingyu,Wu Taizheng,Wang Jiasheng,Wang Runxi,Feng Jiamao,Chen Tianyang,Dincă Mircea,Kornyshev Alexei A.,Feng Guang
We performed constant-potential molecular dynamics simulations to analyse the double-layer structure and capacitive performance of supercapacitors composed of conductive metal–organic framework (MOF) electrodes and ionic liquids. The molecular modelling clarifies how ions transport and reside inside polarized porous MOFs, and then predicts the corresponding potential-dependent capacitance in characteristic shapes. The transmission line model was adopted to characterize the charging dynamics, which further allowed evaluation of the capacitive performance of this class of supercapacitors at the macroscale from the simulation-obtained data at the nanoscale. These ‘computational microscopy’ results were supported by macroscopic electrochemical measurements. Such a combined nanoscale-to-macroscale investigation demonstrates the potential of MOF supercapacitors for achieving unprecedentedly high volumetric energy and power densities. It gives molecular insights into preferred structures of MOFs for accomplishing consistent performance with optimal energy–power balance, providing a blueprint for future characterization and design of these new supercapacitor systems.
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Chemistry-An Asian Journal
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2020
·Vol. 15
·期 7
·1081-1087
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IF 4.056
Tingting Chen,Shuai Liu,Hao Ying,Zhonghao Li,Jingcheng Hao
Graphical A reactive ionic liquid strategy was demonstrated for fabricating unusual 3D Rh particles toward efficient electrocatalytic N 2 fixation. Until now, the synthesis of Rh particles with unusual three-dimensional (3D) nanostructures is still challenging. A 3D nanostructure enables fast ion/molecule transport and possesses plenty of exposed active surface, and therefore it is of great interest to construct 3D Rh particles catalysts for the N 2 reduction reaction (NRR). Herein, we proposed a reactive ionic liquid strategy for fabricating unusual 3D Rh particles with nanowires as the subunits. The ionic liquid n -octylammonium formate simultaneously worked as reaction medium, reductant and template for the successful construction of 3D Rh particles. The as-prepared 3D Rh particles demonstrated excellent activity for electrocatalytic N 2 fixation in 0.1 M KOH electrolyte under ambient conditions with a high NH 3 yield of 35.58 μg h −1 mg cat. −1 at −0.2 V versus reversible hydrogen electrode (RHE), surpassing most of the state-of-the-art noble metal catalysts. Our reactive ionic liquid strategy thus holds great promise for the rational construction of high-performance electrocatalysts toward NRR.
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FUEL
·
2020
·
IF 5.578
Guo Qiu,Biaohua Chen,Chongpin Huang,Ning Liu,Xiuliang Sun
Methods for the conversion of carbohydrates into 5-hydroxymethylfurfural (5-HMF), which is an important platform chemical, have been attracted extensive attention. In present study, Sn modified ionic liquid polymer (PIL-Sn) was prepared by one-pot polymerization of imidazole and epichlorohydrin, and utilized as a novel and efficient catalyst for 5-HMF production. The optimal 5-HMF yield of 51.1% with 99% conversion was obtained from glucose catalyzed by PIL-Sn in dimethyl sulfoxide at 130 °C with reaction time of 1 h. This catalytic system can also be applied for the transformation of other carbohydrates with satisfactory yields. The mechanism of PIL-Sn-catalyzed conversion of glucose to 5-HMF has been studied using density functional theory (DFT) calculations. The DFT results showed that the five-coordinated SnCl 5 - as a preferred species played an important role in the isomerization of glucose to fructose. This research provides a new strategy to design efficient catalysts for 5-HMF synthesis.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
·
IF 5.162
Bo Li,Qi Zhang,Yuanfeng Pan,Yuchen Li,Zhihong Huang,Ming Li,Huining Xiao
Porous magnetic cellulose/Fe 3 O 4 beads (CFBs), consisting of cellulose as matrix and ferrosoferric oxide, were successfully fabricated from microcrystalline cellulose dissolved in an ionic liquid and further modified with glutaric anhydride. The porous structure of modified magnetic cellulose/Fe 3 O 4 beads (MCFBs) was created by nano-sized calcium carbonate (CaCO 3 ). The resulting MCFBs were well characterized and employed as effective adsorbents for removal of dyes from aqueous solution. The adsorption behaviors indicated that the adsorption kinetics was preferably fitted to the pseudo-second-order kinetic model; whereas the adsorption isotherms were well described by Langmuir model with the maximum adsorption capacity of 1186.8 and 151.8 mg/g for methylene blue (MB) and Rhodamine B (RhB), respectively. Moreover, MCFBs are magnetically separable, thus leading to a range of green-based and promising adsorbents towards organic pollutants with easy recovery.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jingjing Li,Zhiyu Wang,Xiaodong Tang,Xiaojie Lei
The olefin alkylation of thiophenic sulfur (OATS) in model fluid catalytic cracking gasoline was carried out using the temperature-responsive catalyst which was prepared by mixing the temperature-responsive ionic liquid (TRIL) and p-toluenesulfonic acid (PTSA) with the mass ratio 1:10 (10% TRIL–PTSA). The liquid–liquid biphasic system was formed during the OATS and returned to the liquid–solid state automatically after completion of the reaction at cooling temperature, which enhanced the mass transfer efficiency and separation ability of oil and the catalyst. As for 10% TRIL–PTSA, the acid strength was adjusted properly by TRIL, and the anionic cluster of [−SO3(−SO3H)x]– was also found by Fourier transform infrared, 1H NMR, and thermogravimetric–differential scanning calorimetry, which displayed a better catalyst performance over PTSA. Moreover, the effects of various factors were fully discussed, including the reaction temperature, reaction time, and catalyst dosage. Under optimal conditions, the conversion of thiophene (T) can reach 100% and it can remain unchanged during 10 recycles. Furthermore, apparent reaction kinetics for OATS was discussed. It suggested that the alkylation of T conformed to the pseudo-first-order kinetic characteristic, and the apparent activation energy was 47.6 kJ/mol. Finally, the synergistic catalysis mechanism was proposed.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2020
·
IF 2.627
Xiaozu Wang,Xiaogang Li,Juan Yue,Yangming Cheng,Ke Xu,Qian Wang,Fan Fan,Zhaohui Wang,Zhaoliang Cui
Ionic liquid (IL), 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6) as a new and environmentally friendly diluent was introduced to prepare poly(vinylidene fluoride) (PVDF) membranes via thermally induced phase separation (TIPS). Phase diagram of PVDF/[BMIM]PF6 was measured. The effects of polymer concentration and quenching temperature on the morphologies, properties, and performances of the PVDF membranes were investigated. When the polymer concentration was 15 wt%, the pure water flux of the fabricated membrane was up to nearly 2000 L·m −2 ·h −1 , along with adequate mechanical strength. With the increasing of PVDF concentration and quenching temperature, mean pore size and water permeability of the membrane decreased. SEM results showed that PVDF membranes manufactured by ionic liquid (BMImPF6) presented spherulite structure. And the PVDF membranes were represented as β phase by XRD and FTIR characterization. It provides a new way to prepare PVDF membranes with piezoelectric properties.
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JOURNAL OF SEPARATION SCIENCE
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2021
·Vol. 44
·期 18
·3357-3365
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IF 3.645
Lizhen Qiao,Ruiting Sun,Yuan Tao,Chunmei Yu,Yang Yan
Guanidinium-based ionic liquids possess lower toxicity and greater designability than commonly used species and have presented good performances in liquid-phase extraction and stationary phase for capillary gas chromatography. In the present work, a novel type of surface-confined guanidinium ionic liquid stationary phase was developed by bonding a hexaalkylguanidinium ionic liquid N,N,N’,N’ -tetramethyl- N”,N”- diallylguanidinium bromide onto the surface of 3-mercaptopropyl modified silica. The obtained surface-confined guanidinium ionic liquid silica materials were characterized by elemental analysis, infrared spectroscopy and thermogravimetric analysis, and then packed as a high-performance liquid chromatography column for the evaluation of chromatographic retention behavior. Typical polar compounds were used to evaluate the separation performances, and the changes of retention with water content in mobile phase further suggested the hydrophilic interaction liquid chromatography retention mechanism. Moreover, the effect of different chromatographic factors (salt concentration, mobile phase pH, and column temperature) on retention was investigated with a series of compounds as test solutes to gain insights into the retention mechanism. The results indicated that the surface-confined guanidinium ionic liquid stationary phase exhibited a hydrophilic interaction liquid chromatography/anion-exchange mixed-mode retention behavior and possessed promising potential in separating a wide range of compounds as an alternative stationary phase for high-performance liquid chromatography.
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Materials
·
2021
·Vol. 14
·期 15
·4225
·
IF 3.623
Zeliang Guan,Zhijun Zhang,Binyang Du,Zhangquan Peng
Today, the requirement for clean, highly efficient, and safe energy seems to be higher and higher due to non-renewable energy and pollution of the environment. At this moment, lithium-ion batteries (LIBs) look like a reliable solution for this dilemma since they have huge energy density. However, the flammability of the conventional electrolyte used in the LIBs is one of critical disadvantages of LIBs, which compromises the safety issue of LIBs. Herein, we reported a non-flammable zwitterionic ionic liquid-based electrolyte named TLPEC, which was fabricated by simply mixing a novel zwitterionic ionic liquid TLP (93 wt%) and ethylene carbonate (EC, 7 wt%). The TLPEC electrolyte exhibited a wide electrochemical potential window of 1.65–5.10 V and a robust ionic conductivity of 1.0 × 10−3S cm−1at 20 °C, which renders TLPEC to be a suitable electrolyte for LIBs with enhanced safety performance. The LIBs, with TLPEC as the electrolyte, exhibited an excellent performance in terms of excellent rate capability, cycling stability, and high specific capacity at 25 and 60 °C, which were attributed to the stability and high ionic conductivity of TLPEC electrolyte during cycling as well as the excellent interface compatibility of TLPEC electrolyte with lithium anode.Keywords:zwitterionic ionic liquid;electrolyte;lithium-ion battery;non-flammability;excellent cycling stability
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Hongbing Song,Lei Liu,Bingxiao Feng,Haozhong Wang,Meng Xiao,Hengjun Gai,Yubao Tang,Xiaofei Qu,Tingting Huang
In this work, modified g-C 3 N 4 was fabricated successfully by calcination of ionic liquid (IL) and urea. The addition of IL changed the polymerization mode of urea, induced the self-assembly of urea molecules, modified the morphological structure of the tightly packed g-C 3 N 4 , and extended the electron conjugation system. When using 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) as a modifier, the heteroatom Cl could be inserted into the g-C 3 N 4 to optimize the electronic structure. The results of characterizations indicate that the unique structure of modified g-C 3 N 4 has an expanded electron delocalization range, introduces an interlayer charge transmission channel, promotes the charge transmission, reduces the band gap, enhances the absorption of visible light, and inhibits electron-hole recombination. Modified g-C 3 N 4 showed excellent photocatalytic performance for the degradation of rhodamine B and tetracycline. Furthermore, the effect of different anions in 1-butyl-3-methylimidazolium salts ([Bmim]Cl, [Bmim]Br, [Bmim][BF 4 ], and [Bmim][PF 6 ]) on the structure and function of g-C 3 N 4 are discussed.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2019
·Vol. 21
·期 48
·26387-26398
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IF 3.567
Rong An,Muqiu Wu,Jing Li,Xiuhua Qiu,Faiz Ullah Shah,Jianliang Li
A strongly ‘pinned’ ionic liquid (IL, [BMIM][PF6]) film on a silicon (Si) surface via carbon capsuled Fe3O4 core–shell (Fe3O4@C) nanoparticles is achieved, revealing excellent friction-reducing ability at a high load. The adhesion force is measured to be ∼198 nN at the Fe3O4@C-Si interface by the Fe3O4@C colloidal AFM tip, which is stronger than that at both Fe3O4@C-Fe3O4@C (∼60 nN) and IL-Si (∼10 nN) interfaces, indicating a strong ‘normal pin-force’ towards the Si substrate. The resulting strengthened force enables the formation of lateral IL networks via the dipole–dipole attractions among Fe3O4 cores. The observed blue shift of the characteristic band related to the IL anion in the ATR-FTIR spectra confirmed the enhanced interaction. The N–Si, P–O chemical bonds formed as a result of the IL interactions with the Si substrate confirmed by XPS spectroscopy suggested that the IL lay on the Si plane. This orientation is favorable for Fe3O4@C nanoparticles to exert ‘normal pin-force’ and press the IL film strongly onto surfaces. The IL ions/clusters are thus anchored by these Fe3O4@C ‘pins’ onto the substrate to form a dense film, resulting in a smaller interaction size parameter, which is responsible for the reduced friction coefficient μ.
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