SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Mingxia Sun,Juanjuan Feng,Yang Feng,Xubo Xin,Yali Ding,Min Sun
The efficient sample pretreatment and high-performance chromatographic separation are essential for an accurate analysis of the complex sample. Finding a material that can apply as both sorbent for sample preparation and stationary phase for chromatography is greatly important for analytical chemistry. With a large number of active sites and designable properties, the dendrimers displayed potential performance for sample preparation and chromatographic separation. In order to improve its selectivity restricted by the limited type of functional groups (amide, ethylidene, amino groups), ionic liquid (1,1′-(1,4-butyricdiyl)bis(1-aminopropyl imidazolium)dibromide) were introduced to functionalize dendrimers. With porous silica as the base, ionic liquid-functionalized dendrimer grafted silica (SiO 2 @G1.5-IL) was obtained and characterized by X-ray photoelectron spectroscopy, elemental analyzer, as well as specific surface and porosity analyzer. The material was used as stationary phase for mixed-mode chromatography and sorbent for SPE, respectively. Under reversed-phase liquid chromatography (RPLC), it successfully separated some hydrophobic analytes (five polycyclic aromatic hydrocarbons (PAHs), two bisphenols, diphenylpropane, and diphenylmethane), by utilizing hydrophobic, π-stacking and hydrogen bonding interactions. Based on the hydrophilic effect, it could separate hydrophilic analytes (nucleosides and alkaloids), which coincident with hydrophilic interaction liquid chromatography (HILIC). And it exhibited better separation capacity than NH 2 @SiO 2 and SiO 2 @G1.5 under the above two modes. Furthermore, the thermodynamic parameters (ΔH, ΔS, and ΔG) of the above types of analytes on the SiO 2 @G1.5-IL column were also investigated in detail, revealing the controlling factors during the chromatographic separation. And the relative standard deviations (RSDs, 0.03–2.95%, n = 10) of the repeatability of chromatographic separation were satisfactory. After that, SiO 2 @G1.5-IL-based SPE column was online combined with high-performance liquid chromatography to investigate the extraction selectivity for three types of hydrophobic organic pollutants (PAHs, estrogens, and bisphenols), and compared to SiO 2 and C18 columns. According to their extraction performance, PAHs were selected as the target analytes, and the online analytical method was established. The limits of detection were as low as 0.001 μg L -1 due to the high enrichment factor reach to 3869, limits of quantity were 0.003–0.17 μg L -1 , linear ranges were from 0.003 to 15.0 µg L -1 , the adsorption capacity was 16.10 μg g −1 , as well as RSDs were 0.5–3.7%, 0.6–6.7%, and 4.2–9.0% for intraday, interday tests and reproducibility. Finally, it was applied to analyze the environmental water samples (tap water, snow water, and rainwater), and satisfactory results were obtained (spiked recoveries were 86.8%-120.9%). Therefore, SiO 2 @G1.5-IL was a powerful material that can be used for the chromatographic separation of both hydrophobic and hydrophilic samples by RPLC or HILIC mode, as well as the efficient online extraction of hydrophobic targets prior to C18 column-based high-performance liquid chromatography.
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Journal of Cleaner Production
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2023
·
IF 11.1
Dan Zhou,Jianfei Sun,Mantong Xue,Qinqin Xu,Jianzhong Yin
Carbon dioxide (CO 2 ) has been recognized a renewable C1-level green chemical synthesis feedstock . Achieving 100 % atom utilization is possible through the cycloaddition reaction of CO 2 with epoxides . Ionic liquids are commonly used catalysts for this reaction, but conventional immobilization methods may lead to the loss of active components under severe conditions. Developing a new Ionic Liquid catalytic system offers a promising and eco-friendly approach to efficient CO 2 cycloaddition. In this study, imidazolium ionic liquid was chemically immobilized on graphene oxide (GO) to get a novelty catalyst GO-SmIm Br. The impact of catalyst dosage, temperature, pressure, and reaction time on the reaction performance of CO 2 and propylene oxide was systematically investigated in a batch reaction system, achieving a propylene carbonate yield of up to 90.4 % in the CO 2 cycloaddition reaction. Even after five cycles, the yield only decreased by 9.6 %, showcasing its robust catalytic activity . Further assessment in a fixed-bed reactor at 120 °C for 8 h demonstrated a continuous propylene carbonate yield of 55.6 %, highlighting the potential of GO-SmIm Br for efficient and sustainable CO 2 utilization.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
·
IF 4.2
Ge Li,Bingtao Zhang,Zhe Tan,Ling Jiang,Zhikan Yao,Lin Zhang
Cellulose, a sustainable raw material, holds great promise as an ideal candidate for membrane materials. This work focused on establishing a green route for fabricating cellulose nanofiltration membranes by reusing a binary solvent of a mixture of ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate and dimethyl sulfoxide (DMSO). The rheological and thermodynamic properties of cellulose solutions were thoroughly investigated to gain fundamental insights into cellulose membrane formation using a mixture solvent. The morphologies and separation performances of the cellulose membranes were also studied. Based on these results, we successfully developed a cellulose membrane with a remarkable water flux of 101.8 L/m2·h, and the rejections for both Congo Red and Evans Blue were higher than 99.7%. Furthermore, the cellulose membrane demonstrated excellent antifouling performance and stability in long-term operation. Moreover, we conducted an attempt on the recycling and reuse of IL and DMSO, revealing that the structure and separation performance of the cellulose membrane produced using the recovered solvent were comparable to those of the membrane obtained using the original solvent. These results highlighted a sustainable approach to fabricating high-performance cellulose membranes.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yong Zheng,Qian Wang,Yongjun Zheng,Zhen Wang,Dayong Tian
Electrolytic recovery of pure aluminum is a conventional method for the recycling of waste aluminum alloys, which is very important to economic development and environmental protection. However, the conventional electrolytic recovery process suffers from several inherent problems, which restricts the further development of this technology. In this study, an air- and moisture-stable 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ionic liquid was applied in the dissolution of aluminum chloride. The upper phase of the resulting mixture was used as a low-temperature electrolyte in the electrolytic recovery of pure aluminum. The results of cyclic voltammetry and linear sweep voltammetry showed that aluminum could be electrodeposited from the electrolyte and that the main impurity elements of the aluminum alloy could also be stripped off by the electrolytic method. Based on these measurements, the electrolytic recovery process was conducted at 0.2−0.6 V and 303.2−373.2 K. Scanning electron microscope micrographs showed that smooth, compact and well-adherent deposits were obtained at 0.4 V from 303.2 to 323.2 K. In this situation, the preferred crystallographic orientation of these deposits was the (200) plane. Meanwhile, the mass content of aluminum in all deposits was higher than 99.6% according to the purity characterization. This study may be useful for the further application of ionic liquids in the low-temperature recycling of waste aluminum alloys.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Shuang Zheng,Shaojuan Zeng,Guilin Li,Bowen Li,Lu Bai,Haiyan Jiang,Qiwei Yang,Xiangping Zhang
Porous ionic liquid (IL) composites, such as impregnated, encapsulated, and porous ILs, are widely used for CO2 capture. However, IL-based adsorbents generally have relatively low IL loading, which cannot fully exploit the unique advantages of ILs. Porous ILs with high IL loading over 90 wt % had high viscosity affecting mass transfer. Therefore, how to simultaneously avoid high viscosity and improve the CO2 absorption rate and IL loadings is of great significant. Herein, a novel fluid IL composite with self-assembled porosity and chemical sites was originally proposed for the CO2 separation. It was prepared by introducing amino-acid IL (AAIL) [N2222][Gly] as the dispersing phase, the mixture of [Emim][Tf2N] (IL1) and [HDBU][Im] (IL2) as the continuous phase, and silica H-20 as the emulsifier, which was named AAIL-H20-IL1/IL2. The results demonstrated that an excellent CO2 capacity of 2.30 mmolCO2/g-sorbent was obtained (313 K/1 bar) with the highest IL loading of 98 wt % among the state-of-the-art value. Meanwhile, micro droplets and porous structures can effectively increase the CO2 absorption rate. The superior CO2 capacity was deduced by the chemisorption of [N2222][Gly] and [HDBU][Im] revealed by in situ FTIR and DFT calculation. In general, this work proposes a pioneer strategy to prepare fluid porous IL composites with ultrahigh IL loading for facilitating CO2 separation.
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CHEMOSPHERE
·
2023
·
IF 8.8
Qian Qu,Huan Li,Shuman Li,Zhijie Hu,Mingzhao Zhu,Junhong Chen,Xuebiao Sun,Yuqi Tang,Zejun Zhang,Yuanzhu Mi,Weichu Yu
Stable emulsions can have numerous negative impacts on both the oil industry and the environment. This study focuses on the synthesis of two ionic liquids (via. PPBD and PPBH) with four hydrophobic branches and four ionic centers that can effectively treat oil-water emulsions at a low temperature of 40 °C. Their chemical structure was explored using Fourier-transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance hydrogen spectra ( 1 H NMR). The effect of temperature, PPBD and PPBH concentration, oil-water ratio, salinity and pH value on the demulsification efficiency (DE) of W/O emulsion was studied detailly and several commercial demulsifiers were also used for comparison. Results revealed that by adding 250 mg/L of PPBH in an E30 emulsion and leaving it for 120 min at 40 °C, the DE could reach 96.34%. Meanwhile, in an E30 emulsion (oil-water mass ratio of 3:7) with 250 mg/L of PPBD, the DE of 95.23% could be obtained at 40 °C for 360 min. Especially, the DE of PPBH could reach 100% in an E70 emulsion (oil-water mass ratio of 7:3) at the same conditions. Additionally, the demulsifier (PPBH) exhibited excellent salt resistance and outperformed some commonly used commercial demulsifiers. Several methods were utilized to investigate the potential demulsification mechanism, including measuring interfacial tension (IFT), three-phase contact angle (CA), droplet contact time, zeta potential , and observing samples under optical microscopy.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Qinzhi Yuan,Guangjun Mei,Cheng Liu,Qian Cheng,Siyuan Yang
To improve the quality of the iron concentrate, the efficient separation of pyrrhotite from magnetite has always been an important beneficiation objective. In this paper, a novel collector of sulfur-containing ionic liquid (SCIL) was synthesized by using the isobutyl xanthic acid with N -tetrabutyl quaternary ammonium salt, and its molecular structure was characterized by 1 H NMR, 13 C NMR and FTIR analysis. The SCIL was used as a flotation collector for the first time to selectively separate pyrrhotite from magnetite by reverse flotation. Its flotation performance and adsorption mechanism on pyrrhotite or magnetite were investigated by microflotation tests, FTIR spectra, zeta potential measurement, XPS analysis and MDS. The microflotation results demonstrated that the SCIL has excellent collecting ability and selectivity for pyrrhotite against magnetite, compared with the traditional collector of sodium butyl xanthate (SIBX). Specifically. the flotation test results of mixed mineral shown that the S grade was reduced from 25.72 % of feed to 2.92 % of concentrate using SCIL as the collector, confirming its high efficiency. The analyses of zeta potential measurement and FTIR spectra indicated that SCIL was chemisorbed onto the pyrrhotite surface. The XPS results further confirmed that the C S bond of SCIL could be associated with S sites of the pyrrhotite surface, and Fe sites of the pyrrhotite surface might react with the C N or the C S bonds of SCIL. MDS further indicated that the adsorption of SCIL onto the pyrrhotite surface was much stronger than the SIBX.
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ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Chenhui Duan,Zihui Liang,Jinguo Cao,Bowen Jin,Yidong Ming,Shimin Wang,Binghe Ma,Tao Ye,Congcong Wu
Formamidinium (FA)-based perovskites remained state-of-the-art in the field of perovskite solar cells (PSCs) owing to the exceptional absorption and carrier transport properties, while the transition from photoactive (α-) to photoinactive (δ-FAPbI3) phase is the impediment that causes performance degradation and thus limits the deployment of FA-based PSCs. The unfavorable phase transition originates from tensile strain in the FAPbI3 crystal lattice, which undergoes structural reorganization for lattice strain balancing. In this work, we found that the ionic liquid (IL) could be used as the strain coordinator to balance the lattice strain for stability improvement of FAPbI3 perovskite. We theoretically studied the electronic coupling between IL and FAPbI3 and unraveled the originality of the IL-induced compressive strain. The strain-relaxed α-FAPbI3 by IL showed robust stability against environmental factors, which can withstand ambient aging for 40 days without any phase transition or decomposition. Moreover, the strain-relaxed perovskite films showed a lower trap density and resulted in conversion efficiency improvement from 18.27 to 19.88%. Based on this novel strain engineering strategy, the unencapsulated PSCs maintained 90% of their initial efficiency under ambient-air aging for 50 days.
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FUEL
·
2022
·
IF 8.035
Shao-Xu Mao,Qi-Hang Zhou,Hui-Li Guo,Ming Du,Wen-Shuai Zhu,Hua-Ming Li,Jing-Yu Pang,Dong-Bin Dang,Yan Bai
A novel porous phosphomolybdate-based poly(ionic liquid) catalyst containing 70 % water (PDIM-PMo-W 70% ) was assembled with H 3 PMo 12 O 40 (HPMo) and poly-[3-dodecyl-1-vinylimidazolium] bromine (PDIMBr), and characterized by FT-IR, UV–vis, XRD, XPS, Contact angle test, SEM, TEM, TGA, and N 2 adsorption–desorption analysis. The turnover frequency (TOF) value of PDIM-PMo-W 70% for (dibenzothiophene) DBT removal can reach 41.15 h −1 at 50 °C, which is 35.47 and 9.92 times higher than that of HPMo and PDIM-PMo. The catalyst could be recycled at least five times without a significant change in catalytic activity . The water content of the catalyst, reaction temperature, the molar ratio of H 2 O 2 /S, catalyst dosage and different sulfur-containing compounds upon oxidative desulfurization (ODS) performance were studied in detail. Most notably, the effects of water on the microstructure and catalytic activity of polyoxometalate-based poly(ionic liquid) were systematically investigated for the first time. As well as the water absorption behavior on the catalyst was reversible, and the dehydrated catalysts after soaking in water could still show excellent catalytic activity. In addition, a reasonable reaction mechanism was proposed with the aid of EPR analysis and radical quenching experiments.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jie Tian,Junyan Wei,Yeping Liang,Ruixue Guo,Beibei Li,Ruijuan Qu,Dongmei Zhou,Zunyao Wang,Ping Sun
This study aimed to investigate the catalytic performance of Fe 3 O 4 /ZnO in the ozonation of 1-hexyl-3-methyl imidazolium bromide ([HMIM]Br). The Fe 3 O 4 /ZnO composite was prepared by a quick and convenient two-step coprecipitation method, and the optimum mass ratio of Fe 3 O 4 :ZnO was determined as 1:8. The structure, surface morphology, and chemical composition of the Fe 3 O 4 /ZnO composites were studied by characterization methods. The degradation efficiency of [HMIM]Br reached 96% in 5 min in catalytic ozonation with the Fe 3 O 4 /ZnO composite, an increase of 20% compared with ozonation alone. Moreover, the pseudo-first-order rate constant was 1.5 times higher than ozonation alone. With the increase in the catalyst dosage, the degradation efficiency of [HMIM]Br first improved and then decreased, and the optimum dosage was 0.25 g/L. The increase in pH value and the introduction of Cu 2+ effectively promoted the catalytic ozonation of [HMIM]Br with Fe 3 O 4 /ZnO, while the reducing inorganic ions inhibited the ozonation reaction. Different water matrices had little influence on the catalytic performance of Fe 3 O 4 /ZnO. Radical scavenging and EPR experiments showed that hydroxyl radicals (•OH), superoxide radicals (O 2 •- ) and singlet oxygen ( 1 O 2 ) were the main active species in this system. Meanwhile, product identification showed that the degradation of [HMIM]Br mainly included hydroxylation, imidazole ring cleavage and bond cleavage. Toxicity prediction illustrated that the catalytic ozonation of [HMIM]Br could effectively reduce its toxicity. The efficiency, toxicity, reusability, and stability experiments suggested that the developed catalyst, Fe 3 O 4 /ZnO composite, had promising prospects in catalytic ozonation.
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Micromachines
·
2022
·Vol. 13
·期 8
·1235
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IF 3.523
Zhi Zhang,Yao Wang,Qun Chen,Qingguo Gao,Liming Liu,Jianjun Yang,Xinjian Pan,Yu Miao,Feng Chi
The electrophoretic display (EPD) has attracted widespread attention due to its great visual perception, energy-saving, portability, and bistability. However, the EPD still has many problems in response time, colorization, etc., which limits its practical application. In this paper, novel blue electrophoretic particles were prepared with copper (II) phthalocyanine and high ionization 1-butyl-1-methyl piperidinium bromide mono ionic liquid. It was shown that electrophoretic particles dispersed in a non-polar tetrachloroethylene medium had high Zeta potential and electrophoretic mobility. At the same time, electrophoretic particles showed better dispersion stability. Finally, the prepared blue electrophoretic particles and white titanium dioxide particles were compounded to prepare blue and white dual-color electrophoretic dispersion. An EPD cell was made to test its performance. The results showed that the prepared blue and white dual-color electrophoretic dispersion could realize a reversible response. Piperidine mono ionic liquid increased the surface potential of copper (II) phthalocyanine from +30.50 mV to +60.27 mV, enhancing it by 97.61%. Therefore, we believed that modifying particles with high ionization mono ionic liquid had great applicability to the modification of electrophoretic particles, and blue particles prepared with piperidine mono ionic liquid as a charge control agent (CCA) were excellent candidates for EPDs.Keywords:zeta potential;ionic liquid;copper (II) phthalocyanine;electrophoretic particle
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 11
·6282
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IF 6.208
Weikai Ding,Yousef Sultan,Shumei Li,Wenjun Wen,Bangjun Zhang,Yiyi Feng,Junguo Ma,Xiaoyu Li
Previous studies have indicated that the harmful heavy metal lead (Pb) contamination in aquatic systems has caused intelligence development disorders and nervous system function abnormalities in juveniles due to the increased permeability of the blood–brain barrier. Ionic liquids (ILs) are considered “green” organic solvents that can replace traditional organic solvents. Studies have found the presence of ILs in soil and water due to chemical applications or unintentional leakage. Therefore, what would happen if Pb interacted with ILs in a body of water? Could ILs enable Pb to more easily cross the blood–brain barrier? Therefore, we examined the combined exposure of Pb and ILs in common carp at low concentration (18.3 mg L−1of Pb(CH3COO)2•3 H2O and 11 mg L−1of the IL 1-methyl-3-octylimidazolium chloride, 5% of their LC50) for 28 days in the present study. The result of a neurobehavioral assay showed that chronic exposure of lead at lower concentrations significantly altered fish movement and neurobehaviors, indicating that lead exposure caused neurotoxicity in the carp. Increases in the neurotransmitter dopamine levels and injuries in the fish brain accounted for neurobehavioral abnormalities induced by lead exposure. Moreover, we also found that lead could easily cross the blood–brain barrier and caused significant bioaccumulation in the brain. Particularly, our study indicated that the ionic liquid could not synergistically promote blood–brain barrier permeability and hence failed to increase the absorption of lead in the fish brain, suggesting that the combined exposure of lead and ILs was not a synergistic effect but antagonism to the neurotoxicity. The results of this study suggested that ILs could recede the Pb induced neurotoxicity in fish.Keywords:Cyprinus carpio;Pb;ionic liquid;combined exposure;neurotoxicity
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危险品化学品经营许可证（带存储）