CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Nan Wang,Zhengqi Peng,Hongxia Gao,Teerawat Sema,Jialong Shi,Zhiwu Liang
Effective phase-change solvent system, n-methyl-2-hydroxyethylamine (MAE) + water-insoluble alcohol + H 2 O, was developed for CO 2 capture. First, a preliminary screening of several alcohols was carried out and showed that the MAE/n-butanol/water system had the potential to become an excellent phase change absorbent. Then, through phase change experiment, absorption experiment, desorption experiment, and theoretical energy consumption analysis, the MAE:n-butanol:water ratio of 3:4:3 possessed the most impressive CO 2 capture performance. Theoretical calculation of CO 2 desorption energy consumption showed that in comparison with 30 wt% monoethanolamine (MEA), 50% of reboiler heat duty can be reduced in case of the 3:4:3 system. In addition, equilibrium phase diagram of the three components showed that concentration of n-butanol significantly affected the phase separation. The two-phase species distribution after phase separation was determined using Nuclear magnetic resonance spectroscopy (NMR). This work also shows that temperature has influence on absorption and desorption performance. Finally, the absorbent stability test during absorption–desorption process confirmed that MAE/n-butanol/water absorbent had a great potential for capturing CO 2 .
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 10
·e55051
·
IF 3
Xiaoling Da,Zhaoyi Deng,Tong Wu,Ya Cao,Ming Xiang,Feng Yang
To study the effect of molecular structure on ethylene-vinyl alcohol copolymer (EVOH) thermal stability during processing, EVOH samples with different molecular weights and comonomer distributions were prepared by solubility fractionation from two different commercial materials, and then, the structure features of samples were characterized by 1 H-NMR, viscometry, differential scanning calorimetry, and, especially, successive self-nucleation and annealing. Their thermal stabilities were further analyzed by isothermal oxygen treatment and thermogravimetry. Attenuated total internal reflectance Fourier transform infrared spectroscopy and UV were used to obverse the structural changes in samples (the formation of chromogenic groups: CO and CC ). According to the results of isothermal oxygen treatment at 200°C, at the same ethylene content, low-molecular-weight samples have worse thermal stability, which were extremely easy to yellowing and form insoluble gel. To investigate the structure differences between the low-molecular-weight samples, it was found that long vinyl alcohol segments may not worsen the thermal stability in the conditions of the same ethylene content. But samples with a uniform distribution of ethylene segments and a certain length of ethylene segments will have better thermal stability, which makes it more difficult to form carbonyl even diketene conjugation structure.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2020
·Vol. 43
·期 7
·1339-1347
·
IF 2.878
Xiao-Hong Fan,Yuan-Hang Chang,Li-Tao Wang,Ya-Wei Zhu,Ming-Zhu Dong,Mu-Jie Lv,Juan-Yan An,Qing Yang,Jiao Jiao,Dong Meng,Yu-Jie Fu
Taxanes are natural anticancer constituents, and the sample preparation from matrix normally depends on organochlorine solvents. In this study, green and natural menthol-based aqueous deep eutectic solvent was synthesized and used for sample preparation for taxanes. Five key parameters were optimized and the optimal preparation conditions were as follows: menthol/1-propanol ratio 1:1 (mol/mol), solid–liquid ratio 1:30 g/mL, extraction time 30 min, ultrasonic power 250 W, and water content 80%. Under the above conditions, the total extraction efficiency of seven main taxanes was 1.25- to 1.44-fold to the conventional methods. In addition, a high-performance liquid chromatography method with C 18 column was established for quantitation of seven main taxanes in <25 min, which had excellent linearity ( R 2 > 0.9986), precision (relative standard deviation < 3.00%), repeatability (relative standard deviation < 3.69%), and recovery (90.26–109.00%). This method performed the extraction, and enrichment processes simultaneously, and it had advantages such as high extraction efficiency, simple operation, low cost, and eco-friendliness. This work indicated that the natural menthol-based deep eutectic solvent aqueous could be an excellent alternative to the sample preparation from Taxus or other plants.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Zhang Hongli,Guo Yan,Li Ning,Ma Sumeng,Zhao Fanrong,Wang Kai,Jing Xu,Han Jiajun
The development of deep eutectic solvents (DESs) that can be readily and sustainably recycled is expected to reduce costs and enhance the environmental friendliness of extracting plant-derived active ingredients. Here, a novel temperature-responsive DES prepared from propylene carbonate and n -butanol was employed as the extractant for ultrasound-assisted extraction of berberine from Coptis chinensis Franch. The prepared temperature-responsive DES did not require the addition of acids, bases, or salts. Phase separation between DES and water was achieved under mild conditions simply by adjusting the temperature. At 45 ° C, DES and water formed a single phase and were used for berberine extraction. Upon decreasing the temperature to 25 ° C, the DES phase separated from the aqueous phase, enabling recovery of DES and berberine. The relatively low critical solution temperature (45 ° C) of DES enabled mild extraction conditions, minimizing the thermal degradation of active components. The recovered DES was reused for subsequent extractions; after five cycles, the yield showed no decrease, while berberine recovery remained above 80%. Moreover, the biological activity of the berberine extract was assessed, revealing its efficacy in suppressing the lipopolysaccharide-induced inflammatory response in RAW264.7 cells and inhibiting the proliferation of gastric cancer cells. Furthermore, network pharmacology analysis suggested that berberine may exert antigastric cancer activity by regulating the cell cycle. Overall, this study presents a green and sustainable strategy for berberine extraction and provides a promising basis for its potential application in gastric cancer therapy.
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Busheng Zhang,Liangcai Lin,Canjie Zheng,Xuan Liu,Wanjing Cui,Xin Li,Xiaotong Lyu,Cuiying Zhang
“Empty cup aroma” is an important characteristic and quality evaluation standard of Jiangxiang-type Baijiu (JXB). In this study, an in situ detection method for the empty cup aroma of JXB was established, and the authenticity and origin information of JXB were identified with an untargeted flavoromics strategy. The complex composition of JXB leads to slow ethanol volatilization, which is a potential method for identifying artificial JXB. The results of the sensory analysis showed that acidic, sauce, burnt and qu in the empty cup of JXB were the strongest at the 45 min stage. A total of 155 compounds were detected in the empty cups of 15 JXB from different regions during 45 min of standing, and 34 compounds were identified as key aroma compounds in the empty cups of JXB. Eleven potential markers were screened (VIP > 1), which can be used to distinguish JXB produced in Guizhou/Sichuan and other regions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 11
·1428
·
IF 3.9
Ze Xiao,Xi Lin,Wenhua Feng,Binyi Chen,Qingwei Meng,Tiejun Wang
Hydrogen from biomass, as a promising alternative fuel, is becoming considerably attractive due to its high energy density and clean emissions. The aqueous phase reforming (APR) of biomass-derived oxygenated hydrocarbons and water is a renewable and efficient pathway for hydrogen production and shows great potential. However, the key to the application of this technique is to develop catalysts with high hydrogen productivity. In this work, we first synthesized polyaniline–platinum (PANI-Pt) organo-metallic hybrid precursors and then obtained a high-loaded (~32 wt.% Pt) and highly dispersed (~3 nm Pt particles) Pt@NC−400 catalyst after pyrolysis at 400 °C, and the nanoparticles were embedded in a nitrogen-doped carbon (NC) support. The Pt@NC−400 catalyst showed an almost three times higher hydrogen production rate (1013.4 μmolH2/gcat./s) than the commercial 20% Pt/C catalyst (357.3 μmolH2/gcat./s) for catalyzing methanol–water reforming at 210 °C. The hydrogen production rate of 1,2-propanediol APR even reached 1766.5 μmolH2/gcat./s over the Pt@NC−400 catalyst at 210 °C. In addition, Pt@NC−400 also exhibited better hydrothermal stability than 20% Pt/C. A series of characterizations, including ICP, XRD, TEM, SEM, XPS, N2physisorption, and CO chemisorption, were conducted to explore the physiochemical properties of these catalysts and found that Pt@NC−400, although with higher loading than 20% Pt/C (~23 wt.% Pt, ~4.5 nm Pt particle), possessed a smaller particle size, a more uniform particle distribution, a better pore structure, and more Pt metal active sites. This study provides a strategy for preparing high-loaded and highly dispersed nanoparticle catalysts with high hydrogen productivity and sheds light on the design of stable and efficient APR catalysts.Keywords:oxygenated hydrocarbons;Pt@NC catalysts;aqueous phase reforming;hydrogen production
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Junning Shu,Peizhou Li,Xin Huang,Xiaowei Cheng,Na Wang,Hongxun Hao
In this work, the solubility of acetylcysteine in 12 pure solvents (water, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, dimethylformamide, formamide, ethylene glycol, dimethylacetamide, and dimethyl sulfoxide) was determined using a dynamic method over the temperature range from 278.15 to 323.15 K. The results indicate that the solubility of acetylcysteine increases with increases in temperature. Furthermore, the solubility of acetylcysteine in alcohols decreases with decreasing polarity. These solubility data were compared with predictions generated using the modified Apelblat equation, the λh equation, the Wilson model, and the NRTL model. The modified Apelblat equation generated the most accurate values.
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 43
·e202302665
·
IF 2.1
Muhammad Umair Ahmad,Guoying Zhao,Shahid Hussain
Graphical An efficient trifloalumiate supported MOF(UIO-67) catalyst was synthesized to promote the butyl levulinate formation from α-angelica lactone under mild reaction, resulting in remarkable conversion and selectivity. The catalyst was easily separated and could be recycled five times without significant activity loss. Herein, levulinate acid esters (LAEs) were efficiently synthesized from the α-angelica lactone (α-AL) esterification with trifloaluminate ionic liquids supported UIO-67 MOF as Lewis acidic catalyst. A series of UIO-67 catalysts with varied trifloaluminate ionic liquids loading were prepared via the post-modification method and exhibited excellent catalytic activity for α-AL esterification. Remarkable α-AL conversion (100 %) and LAEs selectivity (>99 %) were achieved by UIO-67 catalysts (0.2 mol %) with 12.4 %, trifloaluminate ionic liquids loading (UIO-67-TFA) at 70 °C and 90 min. The UIO-67-TFA catalyst can be reused at least 5 cycles without significant loss of catalytic activity. The UIO-67-TFA catalysts were fully characterized by XRD, SEM, XPS, TGA, IR, N 2 physisorption, etc. The results indicated that the well-distributed active trifloaluminate Lewis acid catalytic sites, high BET surface area, and good thermal stability could contribute to its excellent catalytic activity.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Mingjie Xu,Qiwen Tang,Zhengluo Wang,Hongxi Xiong,Yuhang Xie,Zelong Yu,Xiaohan Wang,Yonglin Chen,Weijiang Zhou,Shuihua Tang
Designing and preparing efficient and stable oxygen evolution reaction (OER) catalysts is crucial to improve water splitting performance. One-dimensional (1D) structural catalysts have received increasing attention for the OER due to their unique structural characteristics. In this study, 1D mesoporous NiFe 2 O 4 (NFO) spinel nanorods are fabricated by electrospinning, and the differences in physical structure and electrochemical performance of NFO nanorods prepared by different electrospinning precursors are investigated. It is found that the NFO nanorods prepared by precursor of nickel-iron hydroxide particles (denoted as NFO H) exhibit a diameter of approximately 200 nm and a surface area of 26.4 m 2 g −1 . In 1 M KOH solution, NFO H nanorods achieve low overpotentials of respective 316 mV and 396 mV to obtain current densities of 10 mA cm −2 and 50 mA cm −2 , as well as a low Tafel slope of 67.2 mV dec −1 , even lower than commercial NFO. Notably, the nanorods also demonstrate excellent long-term stability. The high OER activity can be attributed to the small nanoparticle size, abundant electrochemical active sites provided by the 1D mesoporous nanostructure, and increased conductivity, which promote charge/electron transfer and enhance the conversion of active species, thereby improving the efficiency of water electrolysis. This work may broaden the perspective and approach for the structural design of OER catalysts.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·
IF 29.4
Xin Zhang,Tian Yin,Jianping Ge
Thermochromic photonic crystals are promising materials for thermal printing due to their unfaded colors under chemical/illuminated environments and the absence of toxic chemicals. However, the slow thermochromic response, the multistep printing procedures, the use of inks or developing liquids, and the requirement of expensive parts in printers limit their applications. Here, a thermochromic polyurethane/hydrophobic-SiO 2 photonic crystal/paraffin (PU/HPO-SiO 2 -PC/Para) film with an integrated multilayer structure is fabricated for all-solid-state and single-step thermal printing that is fully compatible with commercial printers. The fast thermochromic response in milliseconds enables high-resolution and grayscale printing as the paraffin infiltration and the color change can be finely controlled in a microscale range. The integrated and hydrophobic multilayer structure renders the thermochromic film good stability in daily liquids, which addresses the long-existing concern of print fading. Meanwhile, the integrated multilayer structure also enhances the mechanical stability when it is deposited on fibrous paper so that people can fold, cut, or staple the thermal papers, and make notes confidently in practical usage.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Xiushuai Guan,Shanbiao Jin,Le Liu,Xiya Zhao,Xiaochao Zhang,Changming Zhang,Zhong Li,Caimei Fan
The utilization of oxygen vacancies to modulate the surface properties of catalysts is a powerful way to enhance catalytic activity. In this work, the doping effect of Bi 3+ on the performance of CeO 2−δ (Ce x Bi 1−x O 2−δ ) hybrid nanorods with rich oxygen vacancies for the photo-thermal synthesis of dimethyl carbonate (DMC) from CO 2 /CH 3 OH (140 ℃, 1.6 MPa, 4 h) is systematically investigated. It is found that Ce 0.9 Bi 0.1 O 2−δ exhibits the best catalytic performance, achieving a photo-thermal yield of 3.13 mmol∙g −1 without any dehydrating agent (1.14 times compared to thermal catalysis). It turns out that regulating the concentration of Bi 3+ ions not only modifies the oxygen vacancy content, but also improves the light harvesting efficiency. Moreover, a series of characterization techniques, such as X-ray photoelectron spectroscopy, Raman spectrometer and electron paramagnetic resonance are employed to analyze and verify that the asymmetric oxygen vacancies are conducive to the improvement in the CO 2 adsorption-activation. Finally, a possible reaction mechanism model of Bi 3+ doping on CeO 2−δ for the photo-thermal synthesis of DMC from CO 2 and CH 3 OH is proposed. This work provides a practical approach to catalyst surface engineering design.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Zitao Li,Shuang Xing,Jing Liu,Xiaocong Wu,Sichao Zhang,Di Ma,Xianwei Liu
Microbial transglutaminase (MTG) is a usable enzyme for biomacromolecule modification. In the present study, a “molecular chaperonin” strategy was developed to produce MTG in E. coli cytoplasm with high expression level and a “small molecule-mediated chemical modification” strategy was adopted to strip propeptide chaperonin efficiently during purification . Propeptide (Pro) was expressed separately as a chaperonin to facilitate MTG expression in E. coli cytoplasm with a yield up to 300 mg or about 9 kU from 1 L fed-batch culture. Furthermore, small molecular chemicals were applied to interfere the interaction between MTG and Pro. Chemical acetylation was identified as a suitable method to strip Pro resulting in pure MTG with high specific activity up to 49.6 U/mg. The purified acetylated MTG was characterized by MS analysis. The deconvoluted mass and Peptide Sequence Tags analysis confirmed acetylation on amino groups of MTG protein. Finally, the applications of obtained MTG were demonstrated via protein polymerization of bovine serum albumin and PEGylation of human interferon-α2b. Our method provides MTG with high purity and specific activity as well as unique merit with masked amino groups thus avoiding self-polymerization and cross-linking between MTG and substrates.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）