MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yang Yuan,Hui Jia,Jibao Liu,Fei Gao,Xu Zhu,Zihan An,Jie Wang
The development of new low-cost, highly selective and efficient methods for the separation and detection of heavy metal ions in aqueous environments is of great importance for water safety and biological health. In this study, a novel ion separation membrane was prepared for the separation of copper ions in cadmium ion detection solution. Compared with the commercial membrane, the ion mobility was increased by 64.02 %, and further separated by selective complexation of thiacalix[4]arene-p-tetrasulfonate (TCAS), and the separation factor for Cu/Cd reached 34.66. This allowed Cd to be detected preferentially, and reduced the interference of other ions in the detection. The joint electric field environment was regulated to separate the organics and reduce the interference to the detection. The sensing performance was enhanced by modifying the screen-printed electrodes. The proposed sensing platform allows for simultaneous pre-processing and detection and has a detection limit of 0.19 μg-L −1 (S/N = 3) for Cd 2+ .
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RSC Advances
·
2017
·Vol. 7
·期 85
·54266-54276
·
IF 3.108
Haiyan Ji,Haitao Ju,Rong Lan,Peiwen Wu,Jia Sun,Yanhong Chao,Suhang Xun,Wenshuai Zhu,Huaming Li
Hexagonal boron nitride supported catalysts have been well-developed in catalytic desulfurization, but struggle from the drain of catalytically active sites. Herein, an ionic liquid functionalized BN is constructed for stabilization of catalytic sites (phosphomolybdic acid, HPMo). A stable and well-dispersed supported catalyst was successfully obtained, which was confirmed by a series of characterizations. Detailed oxidative desulfurization experiments showed that the IL-induced high dispersity of the HPMo indicated a promising catalytic performance; meanwhile, the IL-assisted stability dominated an enhanced recycling performance. Additionally, the satisfying catalyst exhibited an excellent catalytic activity to numerous sulfur compounds and a fine resistance to interferents. Moreover, the possible reaction process was studied by GC-MS.
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2017
·Vol. 185
·期 3
·606-618
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IF 1.751
Zou Bin,Chu Yanhong,Xia Jiaojiao,Chen Xueshan,Huo Shuhao
Porcine pancreatic lipase (PPL) was immobilized onto functionalized ionic liquid-modified silica carrier using gelatinization and physical adsorption. The immobilized lipase was characterized with N 2 adsorption–desorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FT-IR) before and after modification and immobilization. The results showed that the modification of the ionic liquid and the introduction of lipase had been successfully approved. The rate of enzymatic reaction and its influencing factors was primarily studied by enzymatic reaction kinetics. K
m values of PPL-SiO 2 @CA and PPL-IM/BF 4 -SiO 2 @CA were 4.9 and 3.7 mg/ml, respectively. It indicated that the modification of the functionalized ionic liquid enhanced the affinity between the immobilized enzyme and the substrate. The immobilization efficiency, specific activity, optimum temperature, optimum pH, thermal stability, reusability, and storage stability of the immobilized enzyme were investigated. We found that the stability of the immobilized enzyme was significantly higher than that of the unmodified immobilized enzyme. Specially, PPL-IM/BF 4 -SiO 2 @CA maintained good thermal stability and retained more than 92% of its activity at 65 °C after preheating 3 h.
Above, the immobilized lipase maintained more than 92% of its initial activity after incubating at 65 °C for 3 h.
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PubMed
高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2018
·Vol. 41
·期 5
·739-748
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IF 2.139
Jiaojiao Xia,Bin Zou,Gangbin Zhu,Ping Wei,Zhenjiang Liu
To promote the activity and stability of immobilized porcine pancreatic lipase (PPL), novel carrier was combined with special immobilization method. Enzymatic activity was enhanced after immobilized onto ionic liquid modified magnetic Fe 3 O 4 by electrostatic adsorption. Activity of immobilized enzyme (PPL-IM/BF 4 -Fe 3 O 4 @CA) reached 596 U/g PPL. Through the combination of electrostatic adsorption and embedding immobilization methods, we improve binding force between the carrier and enzyme, and further enhance the efficiency and stability of immobilized enzyme. The activity of PPL-IM/BF 4 -Fe 3 O 4 @CA after repeated third use was 78%. After storage at room temperature for 5 days, the residual activity was 89%. Enzymatic properties and catalytic kinetics of immobilized enzymes were studied, and the effect mechanism of ionic liquid modified Fe 3 O 4 on PPL was revealed. The effect of ionic liquid on the carrier structure was investigated by characterization of XRD, FT-IR, SEM and TG. The mechanism and enzymatic properties of immobilized PPL via electrostatic adsorption and embedding were analyzed. A novel and efficient immobilized PPL was developed.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Zhinan Wang,Xianfeng Hou,Jin Sun,Meng Li,Zhiyong Chen,Zhenzhong Gao
Two ultrasound-assisted pretreatment technologies, ultrasound-assisted alkaline and ultrasound-assisted aqueous ionic liquid tetrabutylammonium hydroxide ([TBA][OH]), are compared systematically in regard to enzymatic saccharification. Pretreated Eucalyptus samples were characterized by powder X-ray diffraction, 13 C cross polarization/magic-angle spinning solid state NMR spectroscopy, Fourier transform infrared spectroscopy, Scanning electron microscope (SEM) and chemistry composition analysis. These results not only explain the enzymatic saccharification difference between samples from the microstructure level, but also provide helpful information for relevant pretreatment research. Ultrasound-assisted [TBA][OH] pretreatment acquired a significant enhancement in the initial enzymatic rate of cellulose (79.39 mg/g/h), and a reducing sugar yield of 426.6 mg/g at 48 h. The pretreatment combining inexpensive aqueous ionic liquid and ultrasound may provide a promising strategy in the field of bio-refinery because of its unique advantages.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Shuting Zhang,Jianwen Wei,Linlin Geng,Lin Ge,Lei Liao
Novel bifunctionalized amine-based protic ionic liquid/KIT-6 composite adsorbents for carbon dioxide (CO 2 ) adsorption have been prepared by impregnating amine-based protic ionic liquids of different types (tetraethylenepentamine nitrate, [TEPA][NO 3 ], or tetraethylenepentamine lysinate, [TEPA][Lys]) and concentrations (20, 30, 40, and 50 wt%) onto N-[3-(trimethoxysilyl)propyl]ethylenediamine-grafted KIT-6. These innovative hybrid adsorbents exhibited remarkable CO 2 adsorption performance and thermal stability. In particular, the adsorbent with 40 wt% [TEPA][Lys] loading exhibited the highest adsorption capacity at 90 ℃ (3.670 mmol·g −1 ), which was almost 5 times higher than that of the original carrier KIT-6 (0.850 mmol·g −1 ). This excellent adsorption performance can be ascribed to the synergistic effect of strong affinity between the amine groups and CO 2 and high porosity of the support. After five adsorption/desorption cycles, the CO 2 adsorption by the adsorbents demonstrated significant regeneration, and the saturated adsorption capacities of 2N-K6-P30 and 2N-K6-L40 were only 8.98 % and 7.77 % lower than those of the original ones, respectively. In addition, the infrared results revealed that CO 2 adsorption is a synergistic process of physical and chemical adsorption, in which chemisorption is dominated, and the CO 2 adsorption mechanism is consistent with the zwitterion mechanism. In conclusion, the bifunctionalized amine-based protic ionic liquid/KIT-6 adsorbents can be suggested as potential/recyclable materials for efficient removal of CO 2 from industrial flue gases after desulfurization.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Jianwei Zhang,Shengjun Tian,Ronghao Liu,Xiaoxia Liu,Jinxin Guo,Yanzhao Yang
As gold is a non-renewable resource, it holds both economic and environmental importance to enhance the recycling of precious metal waste from secondary resources. Herein, a guanidine salt ionic liquid ([DIETMG][NTf 2 ]) with low water solubility and viscosity was synthesized by molecular design of guanidine salt ionic liquid with good biocompatibility and biodegradability, and a solvent-free system of [DIETMG][NTf 2 ]-water was constructed to extract Au(Ⅲ). The findings reveal that the extraction efficiency of Au(Ⅲ) can reach 97.57 % under optimal extraction conditions. Further thermodynamic and kinetic studies revealed that the reaction process is spontaneous and exothermic, with the extraction rate being primarily controlled by interfacial chemical reactions. The system demonstrates remarkable selectivity for Au(Ⅲ) in solutions containing a mix of various metal ions. Finally, ascorbic acid (Vc) was employed as a stripping agent to obtain gold at room temperature. After 8 cycles, [DIETMG][NTf 2 ] still achieved a 90% extraction efficiency. This study provides a new idea and method for recovery of gold from secondary resources.
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APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Yicheng Chen,Qianjun Zhang,Fan Zhang,Zile Li,Yongkang Zhou,Yingxue Qin,Longyu Xu,Feng Feng,Qingtao Wang,Qunfeng Zhang,Xiaonian Li
In the semi-hydrogenation of acetylene, nickel-based catalysts offer a promising alternative to precious metal palladium catalysts. Despite the positive hydrogenation activity of nickel-based catalysts, there is still room for improvement in terms of their selectivity and stability. In this study, a simple incipient wetness impregnation method was employed to prepare Ni(OAC) 2 -IL/Al 2 O 3 catalyst and its performance in the selective hydrogenation of acetylene was investigated. It was found that under the conditions of 170 °C and a space velocity of 600 h −1 , the 3 % Ni(OAC) 2 -IL/Al 2 O 3 catalyst achieved a 95.3 % acetylene conversion with an 85.6 % ethylene selectivity. Furthermore, the catalyst exhibited outstanding stability over a 100 hour test. TEM , XPS and C 2 H 4 -TPD experiments showed that the Ni species were encapsulated in the ionic liquids (ILs), and the interaction between the metal ions , nickel, and the ILs ensured a high dispersion and stability of the actives on the carriers, and the electronic effect between the ionic nickel and the ionic liquids increased the electron cloud density of the Ni, which improved the catalyst selectivity , which is the main reason for its excellent catalytic performance.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jiateng Shi,Junfeng Wang,Tao Dong,Jie Yan,Danfeng Jiang,Zengxi Li,Haitao Zhang
The ionic liquid tetrakis(decyl)ammonium dicyanamide ([TKN][Dca]) was investigated for the selective extraction of Co(II) from a simulated spent battery leachate, achieving efficient separation of Co(II) from Ni(II) and Li(I). [TKN][Dca] demonstrate a high Co(II) extraction efficiency in a 4 mol/L NaCl solution, without requiring pH adjustment. The separation factor ( β Co/Ni ) for [TKN][Dca] was determined to be 47433. Density functional theory (DFT) calculations and ESI-MS spectra revealed that the predominant anionic species involved in Co(II) extraction were [Co(Dca) 3-x Cl x ] − , with [Co(Dca)Cl 2 ] − and [Co(Dca) 2 Cl] − as the primary complexes. The strong coordination between the dicyanamide anion (Dca − ) and Co(II) enabled selective separation of Co(II) from the leachate. Co(II) was efficiently stripped from the loaded organic phase using Na 2 SO 4 , with the extraction efficiency after stripping comparable to that of fresh [TKN][Dca]. Furthermore, [TKN][Dca] exhibits excellent stability and maintained consistent performance over multiple extraction-stripping cycles, highlighting its potential for sustainable applications in metal separation fields.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yifei Ye,Yuanyuan Cui,Li Yang,Jiaxu Zhang,Jianmin Sun
A novel external-skeleton B-containing ionic liquid modified SBA-15 catalyst BBN-Imi-SBA-15-I (BBN denotes borabicyclo[3.3.1]nonane, Imi represents imidazolium ionic liquid) was successfully constructed by a post-modification method for efficiently catalyzing CO 2 -epoxide coupling reaction under both metal- and solvent-free conditions. 5BBN-Imi-SBA-15-I (5 refers to the molar ratio of Si to B), thanks to its synergistic effects of Lewis acid, weak base sites from tertiary amine and quaternary ammonium, hydrogen bond group and nucleophilic group, displayed good catalytic activity with 97 % product yield and 99 % selectivity at 100 °C, 2 MPa in the absence of cocatalyst. The obtained catalyst demonstrated good recyclability during six consecutive catalytic runs, also presented generality for various mono-substitute epoxides. Through in-situ NH 3 diffuse reflectance infrared Fourier transform spectroscopy (NH 3 -DRIFTS) characterization, the Lewis acidity of organo-boron was verified. Besides, kinetics research also proved the positive effect of multiple active components on efficient catalysis under milder conditions over SiO 2 -based metal-free catalysts.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2012
·Vol. 39
·期 6
·2857-2865
·
IF 0.697
Deng Fang,Luo Xubiao,Shu Hongying,Tu Xinman,Luo Shenglian
TiO 2 microspheres were synthesized by the sol–gel method using the ionic liquid (IL) 1-vinyl-3-propylimidazolium iodide (VPIM + I − ) as a reaction medium, then calcined at 500 °C. The samples were characterized by X-ray diffraction, scanning electron microscopy, and ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy. The phase of TiO 2 microspheres is anatase, and VPIM + I − is able to favor the growth of anatase phase and prevents the collapse of small pores. The photocatalytic activity of TiO 2 -IL was tested by degradation of 2-nitrophenol under UV light illumination. The photocatalytic activity of TiO 2 -IL was higher than that of samples prepared in the reaction medium without VPIM + I − .
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GREEN CHEMISTRY
·
2012
·Vol. 14
·期 10
·2752-2758
·
IF 6.32
Yu-Nong Li,Jin-Quan Wang,Liang-Nian He,Zhen-Zhen Yang,An-Hua Liu,Bing Yu,Chao-Ran Luan
A combined experimental and computational study on the imidazolium ionic liquid-promoted conversion of fructose to 5-hydroxymethylfurfural (HMF) was performed. In particular, 1-butyl-3-methyl-imidazolium bromide (BMImBr) was found to be unexpectedly effective for conversion of fructose into HMF without utilizing any other additive or catalyst. Under the optimized conditions, nearly 100% conversion of fructose with a 95% yield of HMF could be obtained. In addition, BMImBr could be easily recovered and reused over 6 times without significant loss of activity. This protocol represents a simple, recyclable and environmentally friendly pathway for HMF production. Furthermore, the detailed mechanism of the BMImBr-promoted conversion of fructose into HMF was also studied through an in situ FT-IR technique, NMR and density functional theory calculations, and demonstrated that the hydrogen bond interaction between BMImBr and fructose could play an important role in promoting the dehydration of fructose. This work also provides further understanding at the molecular level of the reaction process for ionic liquid-promoted conversion of fructose to HMF.
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危险品化学品经营许可证（带存储）