JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2022
·
IF 3.119
Kangling Yin,Li Chen,Feng Liu,Taotao Fan,Yuehang Wu,Shuai Li,Zongcheng Yan
Focused on developing a biocompatible and eco-friendly extraction platform, aqueous two-phase systems (ATPS) containing betaine-xylitol deep eutectic solvent (DES), three small-molecular alcohols (1-propanol, 2-propanol, and tert-butanol), and water were investigated here. The effect of alcohol properties on the efficiency to form ATPS with aqueous solution of DES was studied at 298.15 K and atmospheric pressure. The results suggested that the formation of the ATPS was attributed to the incompatibility between the DES and alcohol in aqueous medium, allowing the increase in the biphasic region using tert-butanol with the highest hydrophobicity among three alcohols. Combined with Karl Fischer titration, the high-performance liquid chromatography (HPLC) analysis was used to evaluate the tie-lines of the ATPS, and it was found that DES components were enriched in the lower phase while alcohol was transferred preferentially to the upper phase. Additionally, the increase in the concentrations of ATPS phase compositions was responsible for the increase in the length of tie-lines, which led to a higher driven force for phase separation. The detailed experimental data were highly correlated by the NRTL model based on a low root-mean-square deviation (≤1.79%). Moreover, five biomolecules (gallic acid, syringic acid, quercetin, kaempferol, and isorhamnetin) were used as probes to determine the extraction ability of the studied DES/alcohol ATPS. This work may lay a promising foundation for the diversity development of the ATPS.
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DYES AND PIGMENTS
·
2022
·
IF 5.122
Yingying Xiang,Yujiao Tu,Lei Jiang,Lin Yuan,Ze Liu,Qiang Xie,Xuequan Xiong,Fei Song
As one of the most widely used azo synthetic dyes, long-term consumption of excessive amaranthcan cause a threat to health. It is very urgent to establish high selective and sensitive method for amaranth detection. Orange fluorescent carbon dots utilizing l -methionine and o-phenylenediamine as raw materials, namely S,N-CDs, were prepared via one-step hydrothermal method . Dialysis, thin layer chromatography and chromatographic column were employed for further purification. The purified dual-mode nanoprobe based on fluorescent and UV absorption was successfully established. For fluorescent, excellent linear ranges of 5–70 μM and 110–195 μM were obtained, and low detection limit was 345.22 nM. For UV absorption, excellent linear ranges of 0–155 μM with low detection limit 12.70 nM. It revealed that inner filter effect and static quenching dominated in amaranth quenching the fluorescent of S,N-CDs. Furthermore, the dual-mode nanoprobe could be efficiently applied to determine amaranth in fruit juice, carbonated drink, and strawberry jam samples. It provided a new insight on the purification of carbon dots and detection of amaranth by dual-mode nanoprobe.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 15
·3658-3668
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IF 6.813
Xirui Kong,Yichen Kong,Xiaobin Liao,Sheng Liu,Yan Zhao
Lithium–sulfur batteries (LSB) are regarded as one of the next-generation energy storage systems with a high energy density. However, the shuttle effect of lithium polysulfides (LiPSs) and irreversible consumption of the Li anode prevent the practical application of Li–S batteries. In this work, a mixed tetrahydrofuran (THF) and dipropyl ether (DPE) based electrolyte has been optimized for Li–S batteries. Due to the common-ion effect, the LiPS solubility has been significantly inhibited when the sulfur cathode is operating in a concentrated electrolyte containing an optimized solvent system with weak dissolving power. And no self-discharge effect occurred in the cells with these electrolytes during a 10 day storage. Besides, the coulombic efficiency (CE) for Li deposition/stripping has been improved by optimizing the ratio of dual lithium salts. Impressively, Li‖Cu half-cells can run stably for more than 500 cycles with a high CE (>99.3%). For these reasons, a Li–SeSPAN cell with a L1L2TE-1382 electrolyte demonstrates an excellent capacity retention (>94% after 500 cycles) with an ultrathin (50 μm) Li metal anode. With a good compatibility of the optimized electrolyte for both the Li metal anode and sulfur cathode, this work provides a new design strategy for the electrolyte for lithium–sulfur batteries.
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Separation Science Plus
·
2022
·Vol. 5
·期 9
·513-519
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IF 0
Yanni Huang,Jia Chen,Gafang Fu,Chi Zhang,Hongdeng Qiu
This work reported the preparation and evaluation of a 2D porous graphene as the stationary phase for gas chromatography with high-resolution performance from non-polar to polar structural isomers. As a result, the dynamically coated porous graphene capillary column has a film thickness of about 16 μm. After aging treatment at different temperatures, the porous graphene capillary column exhibited high thermal stability up to 300°C. In addition, the porous graphene capillary column has good column repeatability and reproducibility. The retention time RSDs are 2.61–3.90% ( n = 3) during the days and 4.58–4.78% ( n = 3) column-to-column. This work demonstrates the advantageous separation performance of a good potential for the porous graphene as a new stationary phase for gas chromatography analysis.
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CHINESE JOURNAL OF CHEMISTRY
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2022
·Vol. 40
·期 13
·1585-1591
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IF 5.56
Wenming Zhang,Xiaoyu Chen,Haoshan Xu,Yiqun Liu,Xiaohui Zhao,Zisheng Zhang,Ling Li
Comprehensive Summary In recent years, the anode materials of bismuth(Bi)-based potassium ion batteries with high theoretical capacity and suitable potassium ion insertion potential have attracted extensive attention. However, due to the volume expansion of Bi, the performance of Bi-based anode materials is not ideal during potassium ion (de)intercalation. In order to solve these problems, we report a three-dimensional (3D) ternary bismuth nanoparticles/conductive polymers/carbon nanotubes (Bi/PPy/CNT) hybrid anode material for K-ion batteries. At a current density of 100 mA·g –1 , its reversible capacity reaches 302 mAh·g –1 after 200 cycles, while it reaches 195.7 mAh·g –1 after 600 cycles at 1 A·g –1 . Its excellent performance is attributed to the hydrogel network which provides a range of electron transport networks and high porosity. Carbon nanotubes are used as electron enhancers to reduce the volume expansion of Bi particles during the reaction. This study provides a prerequisite for expanding the application of 3D ternary materials.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 10
·2602-2612
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IF 6.813
Haosheng Xin,Haiyong Wang,Song Li,Xiaohong Hu,Chenguang Wang,Longlong Ma,Qiying Liu
Catalytic conversion of renewable cellulose, instead of fossil resources, to high-value ethylene glycol (EG) is of great significance for reducing considerable worries regarding the energy problem. However, the EG production from cellulose is dependent on Ni and Ru based catalysts. Herein, encapsulated Co@C catalyst was firstly applied for EG production from cellulose combined with tungstic acid (TA). The mixing of the two catalysts in different ratios was compared and well-controlled, and the highest 67.3% yield of EG can be achieved. TA is used mainly to promote both the cellulose hydrolysis and the retro-aldol reaction of glucose to glycolaldehyde. Co@C catalysts are responsible for the hydrogenation of glycolaldehyde to EG. Compared with traditional noble metals and composite catalysts, the inexpensive and easily synthesized Co@C catalysts could greatly reduce the cost of production of EG. The Co@C catalysts encapsulated with outside graphene layers can keep high stability for at least 6 runs.
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ACS Applied Polymer Materials
·
2022
·
IF 4.855
Dinglei Zhong,Shoutian Qiu,Jiemei Zhou,Dongwei Ma,Yong Wang
Block copolymers are showing great potential in the preparation of advanced membranes for precise separations, and there is a strong interest in the development of hollow-fiber membranes (HFMs) from block copolymers. Herein, we report polysulfone-block-poly(ethylene glycol) (PSF-b-PEG) HFMs with enhanced separation performance prepared by a convenient stretching strategy. Axial stretching is first applied to the melt-spun PSF-b-PEG hollow fibers, efficiently reducing the wall thickness and outer diameter of the hollow fibers. The stretched hollow fibers are then subjected to selective swelling, thus producing HFMs with interconnected nanoporosity. We find that the degree of stretching significantly influences the diameter, length, and separation performance as well as the crystallization behavior of the hollow fibers before and after selective swelling. With a stretching percentage of 527%, the HFMs exhibit simultaneously enhanced water permeance and rejection because of thinned fiber walls and reduced pore sizes. This work reveals the important role of axial stretching in upgrading the performance of block copolymer HFMs and demonstrates that the selective swelling coupled with melt spinning is promising in the cleaner preparation of HFMs.
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JOURNAL OF BIOMATERIALS APPLICATIONS
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2022
·
IF 2.712
Zao Cheng,Junfei Gao,Qianqian Liu,Qun Gu
This work describes the relationship between the antibacterial activity and the ester chain length (C1-C8) of (R)-3-Hydroxybutyric ((R)-3-HB) alkyl esters that synthesized from (R)-3-HB acid ((R)-3-HBA) by esterification reaction. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) decrease as the length of the (R)-3-HB alkyl ester chain increases from 1 to 6, but (R)-3-HB-C7 and (R)-3-HB-C8 have their own rules for different microorganisms. Among them, the (R)-3HB-C6 has the relatively best antibacterial and antifungal properties, which MIC were 1.95 mg mL−1 against E. coli and S. aureus; 0.98 mg mL−1 against C. albicans and B. subtilis; 0.49 mg mL−1 against A. niger. Finally, the antimicrobial mechanisms of the (R)-3HB-C6 are revealed, and these include disruption of biofilm and the bacterial wall/membrane, leakage of the intracellular content, and change in the transmembrane potential. These results imply the potential application of (R)-3-HB alkyl ester as new antimicrobial agents; future research can use this as an antibacterial element to synthesize new polymer materials or agents with high-efficiency antibacterial activity.
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PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 2
·1028-1034
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IF 4.036
Mengmeng Dong,Yanfei Lv,Xue Peng,Shichao Zhao
Silver sulfide (Ag2S) is a traditional semiconductor material, however, the photoelectric properties of Ag2S particles under different environments are still lacking. In this paper, we reported the preparation of Ag2S particles and their photoelectric properties under different environments. Results showed that the photoelectric performance of Ag2S particles was closely related to the environment. It was found that a copper phthalocyanine coating could improve the light response, the mixture of alcohols and air could increase the photoconductivity, and the mixture of carbon disulfide and air could decrease the photoconductivity. The mechanism of the effect of various experimental conditions on photoelectric properties was also discussed.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2022
·Vol. 102
·期 2
·400-411
·
IF 2.606
Yue Wenda,Liang Jun,Wang Honghai,Zhang Yu,Li Chunli,Su Weiyi
In the entrapment of enzymes by sol-gel method, the special procedures for obtaining the unique structure of xerogel are sometimes destructive to enzymes, while the internal structure of xerogels is easily broken. To solve the above problems, we present an economical, bio-friendly procedure for the entrapment of Candida antarctica lipase B in silica xerogel. In this procedure, an encapsulation-structured enzyme-carrying silica xerogel was produced by controlling the evaporation rate of the solvent at ambient pressure during drying, while tetramethoxysilane and methyltrimethoxysilane were used as the co-precursors. The xerogel synthesis was modified and optimized for improving the stability and reusability of the enzyme, while the xerogel characteristic structure was preserved. Moreover, the effects of the co-precursors amount on the mechanical strength, pore structure, hydrophobicity, enzyme loading, and enzyme stability of the enzyme-carrying silica xerogels were systematically investigated. And the best performance was observed at the co-precursors content of 30.28 wt%. Finally, the catalytic performance of the enzyme-carrying silica xerogels on the transesterification of n -butanol with ethyl acetate was demonstrated.
Graphical abstract
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JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Zexian Qin,Hongye Cheng,Zhen Song,Lijun Ji,Lifang Chen,Zhiwen Qi
Lemon essential oil is a complex mixture with citral as the primary terpenoid and limonene as the main terpene. Isolation of terpene and terpenoid, known as deterpenation, is crucial for improving the essential oil quality. In this work, liquid–liquid extraction with deep eutectic solvents (DESs) is utilized for lemon essential oil deterpenation. The performance of 77 DESs formed by seven hydrogen bond acceptors (HBA) with eleven hydrogen bond donors (HBD) is evaluated using COSMO-RS model and verified experimentally. The influences of HBA and HBD structures are investigated and explained by σ-profile. Among 77 DESs, the DES composed of tetrabutylammonium bromide and levulinic acid, namely TBAB:LEA(1:2), is finally selected due to its better performance than the conventional solvent hydrous ethanol. The excellent performance of TBAB:LEA(1:2) in deterpenation of natural lemon essential oil suggests it is a promising solvent in the downstream processing of natural essential oil.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Lei Wang,Boqiang Li,Dionysios D. Dionysiou,Baiyang Chen,Jie Yang,Juan Li
Hydroxyl radical (•OH) is an active species widely reported in studies across many scientific fields, and hence, its reliable analysis is vitally important. Currently, alcohols are commonly used as scavengers for •OH determination. However, the impacts of alcohols on the reliability of •OH detection remain unknown. In this study, we found that adding different types and different amounts of alcohols in water samples treated with ultraviolet irradiation undesirably produced substantial amounts of hydrogen peroxide (H2O2), which is a known •OH precursor. This means that the conventional •OH determination method using alcohols is likely unreliable or even misleading. Through careful investigation, we revealed an overlooked reaction pathway during H2O2 and •OH transformations. Varying oxygen concentrations, pHs, alcohol dosages, and types altered H2O2 formation, which can affect •OH determination accuracy. Among alcohols, n-butanol is the best scavenger because it quenches •OH rapidly but re-forms little H2O2.
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