JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Xinpeng Liu,Baohua Wang,Xiaole Dong,Yahui Qiu,Qingmei Meng
The desulfurization and regeneration performance of nanofluids composed of oxidizing ionic liquids and four inert nanoparticles are investigated. The addition of different nanoparticles has been proved to have enhancement effect on the H 2 S removal performance of oxidizing ionic liquids. The nanofluids with SiO 2 nanoparticles showed the most significant strengthening desulfurization performance as well as regeneration performance. The optimal weight ratio of SiO 2 nanoparticles in nanofluids was confirmed as 0.5%. The regeneration efficiency of the optimal nanofluid system can exceed 88%, which is far higher than that before the addition of SiO 2 nanoparticles. The mass transfer coefficient increased significantly after the addition of nanoparticles. The nanoparticles and nanofluids before and after absorption were characterized by Fourier transform infrared spectra , nuclear magnetic resonance, scanning electron microscope , transmission electron microscope, energy dispersive spectrum and X-ray photoelectron spectroscopy. It was found that the structure and morphology of SiO 2 nanoparticles remained basically unchanged in the absorption-regeneration process. The main final desulfurization product was identified as sulfate.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
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IF 3.171
Hongshuai Zheng,Jiaqi Huang,Tao Dong,Yifan Sha,Haitao Zhang,Jie Gao,Suojiang Zhang
In light of the increasing demand for environmental protection and energy conservation, the recovery of highly valuable metals, such as Li, Co, and Ni, from spent lithium-ion batteries (LIBs) has attracted widespread attention. Most conventional recycling strategies, however, suffer from a lack of lithium recycling, although they display high efficiency in the recovery of Co and Ni. In this work, we report an efficient extraction process of lithium from the spent LIBs by using a functional imidazolium ionic liquid. The extraction efficiency can be reached to 92.5% after a three-stage extraction, while the extraction efficiency of Ni-Co-Mn is less than 4.0%. The new process shows a high selectivity of lithium ion. FTIR spectroscopy and ultraviolet are utilized to characterize the variations in the functional groups during extraction to reveal that the possible extraction mechanism is cation exchange. The results of this work provide an effective and sustainable strategy of lithium recycling from spent LIBs.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Yaxing Li,Rui Zhang,Xianghai Meng,Ping Ouyang,Haiyan Liu,Chunming Xu,Zhichang Liu
Acid-soluble oil (ASO) was produced during isobutane alkylation catalyzed by chloroaluminate ionic liquids (CAILs). However, the ASO composition characterizations and deactivated CAIL regeneration pathway were not clarified. In this work, a series of characterizations (elemental analysis and infrared, ultraviolet, and mass spectroscopy) were performed to reveal the ASO composition. The result showed that ASO contained numerous conjugated cycloolefins with various alkyl substituents and a few O1–O5 compounds. The activity index (AI) value of fresh CAILs was 1.74 and decreased to 1.18 with the addition of 9.09 wt % ASO because the [Al2Cl7]− anion in CAILs was complexed by C═C and C═O bonds in ASO. The hydrogenation regeneration of deactivated CAILs on the Pd/C catalyst was studied. The AI value of regenerated CAILs increased to 1.45 because unsaturated bonds in ASO were hydrogenated to saturation. Recovery of unsaturated hydrocarbons followed the order benzene > 1-methylcyclopentene > pentamethylcyclopentadiene. This work demonstrated that low ASO recovery was attributed to the partial occupation of the π-electron of unsaturated bonds by the [Al2Cl7]− anion.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
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2019
·Vol. 43
·期 2
·293-301
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IF 2.371
Jiaojiao Xia,Bin Zou,Pengyun Wang,Qing Luo,Xin Shen,Rui Ji
Long-term and excessive use of monocrotophos (MPs) pesticide leads to an accumulation of MPs residues in agricultural products. Electrochemical biosensor technology was developed as a simple and efficient method for detecting MPs. However, commercial acetylcholinesterase (AChE) sensors are not applied in practical MPs detection due to poor stability and reliability. In this study, the advantages of functionalized carbon nanotubes (Cl/MWCNTs) and a bi-enzyme system (horseradish peroxidase (HRP)/AChE) were combined, a novel bi-enzyme electrode (Cl/MWCNTs/HRP/AChE/GCE) was constructed. Under optimal conditions, the bi-enzyme sensor had a wide detection range of 1.0 × 10 –11 to 1.0 × 10 –7 mol/L and low detection limit of 4.5 × 10 –12 mol/L. The proposed AChE biosensor exhibited excellent stability and sensitivity for MPs determination and presented a promising tool for monitoring food safety.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2019
·Vol. 20
·期 7
·1685
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IF 4.183
Zhiyong Li,Ying Feng,Xiaoqing Yuan,Huiyong Wang,Yuling Zhao,Jianji Wang
The reversible phase transfer of compounds between two immiscible liquid phases has many applications in a wide range of fields, and ionic liquids have been widely used as potential functional solvents and catalysts. However, photo-triggered reversible phase transfer of ionic liquids between the organic phase and water phase has not been reported so far. In the present work, the reversible phase transfer of six kinds of azobenzene-based ionic liquid surfactants between the organic phase and water phase is investigated by alternative irradiation of UV and visible light. Factors affecting the transfer efficiency, such as chemical structure and concentration of the ionic liquid surfactants, equilibrium photo-isomerization degree, and the aggregation state of ionic liquid surfactants are investigated in detail. It is shown that transfer efficiency greater than 89% was achieved under optimal conditions, equilibrium photo-isomerization degree of the ionic liquid surfactants is the main factor to determine their transfer efficiencies, and the aggregation ofcis-isomers is not beneficial for the transfer.Keywords:ionic liquids;phase transfer;photo-trigger;reversible
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
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IF 2.298
Yuanchao Pei,Qiuping Lu,Yajuan Niu,Yang Zhao,Yuling Zhao,Zhiyong Li,Huiyong Wang,Jianji Wang
Aggregation of surfactants in ionic liquids (ILs) is poorly understood in spite of their great potential for applications in many fields. In this paper, the aggregation behavior of pyrrolidinium IL surfactants [Cnmpyr]Br (n = 10, 12, 14, and 16) in −OH-functionalized protic ionic liquids (PILs), including ethanolammonium nitrate (EOAN), ethanolammonium formate (EOAF), and 3-amino-1-propanol nitrate (POAN), has been studied by surface tension and 1H NMR methods. The effect of the structure of PILs on the aggregation behavior of the IL surfactants is investigated and compared with that in ethylammonium nitrate (EAN) and water solvents. It is found that adding an −OH group in PIL cations significantly reduces the critical micelle concentration (cmc), while increasing the alkyl chain length of the PILs cations leads to an increase in the cmc values. However, the effect of anion type of the PILs on the aggregation is not pronounced for the investigated ILs. Thermodynamic analysis reveals that the aggregation behavior in EOAN is driven by enthalpy and entropy contributions. In addition, the change in the chemical shift of various protons in the IL surfactants and EOAN has been used to analyze the conformational changes of the IL surfactants in the aggregation process. The results reveal the importance of −OH-functionalized PILs in the development of designer IL-based colloidal systems for chemical reactions and materials synthesis.
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JOURNAL OF MEMBRANE SCIENCE
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2019
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IF 7.015
Wangyang Tang,He Lou,Yifang Li,Xiangbin Kong,Yanhui Wu,Xuehong Gu
This work explored a novel way to modify graphene oxide (GO) with ionic liquid (IL) and incorporate the modified GO into polyether block amide (PEBA) membrane for pervaporation of butanol aqueous solutions. The adsorption properties of GO and ionic liquid N -octylpyridiniunm bis (trifluoromethyl) sulfonyl imide [OPY][Tf2N] modified graphene oxide (IL-GO) for butanol and water were investigated via molecular simulation . Because ionic liquid [OPY][Tf2N] has good butanol affinity and hydrophobicity , the adsorption selectivity of butanol over water by the IL-modified GO increased by about 4 times compared with the pristine GO. Then IL-GO was incorporated into PEBA to fabricate mixed matrix membrane. The membrane was characterized, and the pervaporation performance of the membrane was evaluated. Pervaporation experiments showed that the incorporation of IL-GO is in favour of enhancing the membrane performance. Compared with pristine PEBA membrane, at 35 °C, for 2.5 wt% butanol aqueous solutions, the separation factor and permeation flux of the mixed matrix membrane with 1 wt% content of IL-GO were increased by 31.5% and 18.2%, respectively. Meanwhile, connecting ionic liquid to GO can effectively improve the membrane stability by preventing the loss of ionic liquid in the pervaporation process.
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JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Jinsheng Li,Shuang Wang,Fengxiang Liu,Xu Wang,Hao Chen,Tiejun Mao,Zhe Wang
Dimensionally stable and high level of conductivity is of importance for alkaline exchange membrane (AEM) applications. However, the main challenge for AEMs is to control swelling behavior and construct ion transport “high way” simultaneously. Here we report a series of self-crosslinked membranes using poly (aryl ether ketone) as rigid matrix and imidazolium-based polymeric ionic liquid as hydroxyl transporting groups. The obtained membranes possess anisotropic swelling behavior: no more than restricted 4% in-plane swelling ratio indicate excellent dimensional stability; while, obvious through-plane swelling guaranteed abundant water absorption in the hydrophilic domains, which benefited sufficient hydroxide ion dissociation and improved ion conductivity. The swelling ratio of through-plane can be more than tenfold of in-plane. This result quantifies the dramatic influence of flexible polymeric ionic liquid on specific swelling behavior of membranes for the first time. Moreover, the distinct microscopic phase separation endows the membranes possessing high ion conductivity (0.067 S cm −1 ). The introduction of long-chain polymeric ionic liquid not only facilitate continuous pathway, but also reduce the dependency on λ (average hydration number vs. positive group). After treatment in alkaline conditions, the membranes still exhibit more than 8 MPa tensile strength .
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RSC Advances
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2019
·Vol. 9
·期 40
·23119-23128
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IF 3.049
Mei Liu,Xueqin Ding,Xuelian Wang,Jianzhong Li,Huansheng Yang,Yulong Yin
A series of guanidinium ionic liquid modified magnetic chitosan/graphene oxide (GIL-MCGO) nanocomposites have been prepared for DNA extraction via magnetic solid-phase extraction technology. These nanocomposites are of only 20 nanometers in diameter. Single stranded DNA or DNA sodium salts that were absorbed by GIL-MCGO could be quickly collected by an external magnet and extracted. The DNA extraction efficiency of 11 GIL-MCGO nanocomposites was evaluated using NanoDrop. Factors that could impact the DNA extraction process, such as pH, temperature, extraction time, and ionic strength were systematically investigated via single-factor experimental analysis. Under the optimum extraction conditions, a maximum DNA extraction capacity of 233.0 ± 0.4 mg g−1 of GIL-MCGO nanocomposite was achieved. The solid phase extraction method based on GIL-MCGO nanocomposites has been demonstrated with the extraction of DNA from a series of complex sample matrices, including single stranded DNA samples, salmon sperm DNA sodium salt, human whole blood and E. coli cell lysate. The DNA extracted by using the GIL-MCGO nanocomposites are well suitable for PCR amplifications. In addition, an initial study on the interaction between GIL-MCGO and DNA was conducted: the preference of GIL-MCGO on DNA absorption with varying base composition was tested. Only a slight loss in the DNA extraction efficiency of GIL-MCGO was observed after four extraction–desorption cycles, proving excellent regeneration performance and recyclability of the GIL-MCGO nanocomposites in the DNA extraction process.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Ao Li,Hongyan Song,Hong Meng,Yingzhou Lu,Chunxi Li
Sodium hypochlorite (NaClO) is a strong oxidant with facile electrochemical regenerability whereby a sustainable oxidative desulfurization (ODS) process of fuel may be viable. Here, a ultrafast deep ODS process was proposed by using ionic liquid (IL) catalyst and NaClO oxidant, and its catalytic mechanism was studied through GC-MS, FTIR, and in-situ ESR technique. The results show that the IL with C 16 alkyl groups makes the amphiphilic catalysts oil dispersible, and the catalytic activity of the imidazolium is higher than that of pyridinium and ammonium based IL catalysts. Dibenzothiophene (DBT) in model oil and real diesel can be oxidized completely within 30 min, and 99% of catalytic performance can be remained after 8 recycled uses. Under the catalysis of [C 16 MIM][PMoO], NaClO is firstly decomposed into radical oxygen species of O 2 − and OH that oxidize Mo = O of the catalyst to its peroxide form Mo(O 2 ), whereby DBT was oxidized into DBTO 2 . The present ultrafast and sustainable ODS process is perspective for industrial application, and the oxidation mechanism revealed here is instructive for ODS of fuel and other catalytic oxidation reactions.
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CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Lihua Zhang,Wentao Shi,Junqin Wang,Longming Jin,Gang Hu,Qiang Zheng,Haibo Xie,Peng Chen
Gelation and rheological behaviors of cellulose/CO 2 -based reversible ionic liquid (RIL)/DMSO solutions were investigated. The exponents of specific viscosity η sp versus concentration c were determined for wood pulp (WP) and microcrystalline cellulose (MCC) solutions. The complex viscosity acquired using oscillatory shear closely follows the steady shear viscosity, thus revealing the applicability of Cox-Merz rule. The influence of RIL content in the solvent on apparent viscosities, activation energy, intrinsic viscosities, specific viscosity-c[η] master curve, and relaxation time were also investigated. Gelation occurred in this cellulose solution system due to thermal-induced CO 2 release from the decomposition of the CO 2 -based reversible ionic liquid. The formed gel was stable in air, but re-dissolved when exposed to CO 2 , indicating the switch-on and switch-off effects of CO 2 in cellulose dissolution and gelation.
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SEPARATION SCIENCE AND TECHNOLOGY
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2019
·
IF 1.354
Chenhua Shu,Lina Wang,Peijun Kong,Meizhu Gao
A poly ionic liquid, poly(1-vinyl imidazole)-p-xylylene dichloride (PVIm-PXDC), was synthesized and used for fuel oil denitrogenation. The structure of PVIm-PXDC was characterized and the denitrogenation performance was investigated. Results indicate that the pseudo-second-order kinetic model and Langmuir model are appropriate to describe the adsorption kinetics and thermodynamics, respectively. The adsorption ability of PVIm-PXDC for different nitrogen compounds follows the order of indole > pyrrole > quinoline > pyridine. The equilibrium adsorption amount decreased about 10% for all the nitrogen compounds after six regeneration cycles and the denitrogenation and regeneration processes have no influence on the structure of PVIm-PXDC.
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危险品化学品经营许可证（带存储）