SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhifang Tu,Fei Han,Chao Liu,Yingxue Wang,Jianwen Wei,Xiaobin Zhou
Solid-liquid phase-change absorbents (SLPCAs) have a great potential to reduce the energy consumption of CO 2 capture. The main issue in the practical application of SLPCAs is the difficulty in the phase separation of gelatinous solid products. In this study, 2-amino-2-methyl-1-propanol (AMP) was used as a regulator to tune the physical form of the solid products of triethylenetetramine (TETA)-based SLPCAs. Experimental results showed that the AMP-regulated TETA-based SLPCAs successfully avoided the formation of gelatinous products (viscosity up to more than 1000 mPa·s) and yielded easily separated crystalline powders. Among the investigated SLPCAs, TETA/AMP/ N -methyl-2-pyrrolidone (NMP) (TETA:AMP = 2:8, 1 M) exhibited the best CO 2 capture performance with a high CO 2 loading of 0.94 mol·mol −1 and a high regeneration efficiency of 84.14 %. XRD, FT-IR and 13 C NMR analyses indicated that TETA/AMP/NMP absorbed CO 2 to form highly polar carbamate species and protonated amines, which could break the original assimilation state of the SLPCA system; thus, the polar products precipitated out from less polar NMP, leading to a phase change. The theoretical calculations revealed that in the absence of AMP, the TETA-derived products had a tendency to form gelatinous aggregation with large amounts of hydrogen bonds; with the introduction of AMP, the AMP-derived products tended to combine with the TETA-derived products via strong electrostatic attraction and Van der Waals force and effectively inhibited the aggregation formation. Since there was only one hydrogen bond forming between the AMP- and TETA-derived product molecules, the amount of hydrogen bonds was significantly reduced. Eventually, the TETA/AMP/NMP SLPCA avoided the formation of gelatinous products and yielded crystalline powder products.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Yumei Shu,Jinxiu Hu,Lin Yang,Tehreem yaqub,Minhua Ai,Yang Liu,Dandan Shi,Kang Xue,Chengxiang Shi,Xiangwen Zhang,Ji-Jun Zou,Lun Pan
Intramolecular [2+2] photocycloaddition is a reliable way to synthesize high-strained cyclobutyl-containing structures for high-value chemicals. Here we propose a photosensitized dimer of methyl cyclopentadiene (DMCPD) intramolecular [2+2] cycloaddition to synthesize an intriguing liquid caged fuel, namely 3, 8-dimethylpentacyclic [5.3.0.0 2,5 .0 3,9 .0 4.8 ] decane (MPCD), with two four-membered rings, four five-membered rings and two methyl branched chains. The reaction conditions are optimized to obtain a high DMCPD conversion of 80.95% as well as a high MPCD selectivity of 74.19%. Based on the quenching experiment and low-temperature phosphorescence test, intramolecular [2+2] photocycloaddition complies with the Dexter triplet-energy-transfer mechanism, which is essentially double electron exchange between excited photosensitizer and DMCPD. Through kinetic studies, the reaction order ( α =1) and the reaction kinetic equation related to light intensity and DMCPD concentration are obtained. MPCD has excellent physicochemical properties, with a high density of 0.964 g·cm -3 , high net heat of combustion of 42.63 MJ·kg -1 , relatively low kinetic viscosity of 25.03 mm 2 ·s -1 at (20°C), and high specific impulse of 328.19 s.
研究领域:
有机合成
·
光化学
·
燃料化学
·
推进技术
·
化学动力学
✓ 已验证
产品关联
DOI
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2013
·
IF 0.559
Ping Yu,Qilong Sun,Jianming Pan,Zhenjiang Tan,Jiangdong Dai,Yongsheng Yan,Feng Cheng
Poly(styrene–divinylbenzene)/Fe3O4 (Fe3O4@St–DVB) magnetic porous polymer microspheres based on suspension polymerization were prepared for adsorption of 2, 4-dichlorophenol (2, 4-DCP) and 2, 6-dichlorophenol (2, 6-DCP) from aqueous solution. The as-prepared product was characterized by Fourier transform infrared spectroscopy, Raman, X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, differential thermal analysis and elemental analysis. The results showed that the composite material has both porous and magnetic characteristics, which aid in faster separation and increase in adsorption capacity. The adsorption performance of the Fe3O4@(St–DVB) magnetic porous microspheres was manifested by batch mode adsorption experiments with respect to pH, initial concentration, contact time and temperature. The adsorbent was found to be sensitive to changes in pH, and the adsorption capacity of 2, 4-DCP is higher than that of 2, 6-DCP. The kinetics experimental data fitted well with the pseudo-second-order model, as three steps belonged to the pseudo-second-order adsorption process. The adsorption isotherms were also described by the Langmuir and Freundlich isotherm models, respectively. It was found that the Langmuir isotherm model fitted the equilibrium data superior to the Freundlich model. Thermodynamic parameters were calculated by the Gibbs free energy function, confirming that adsorption process was spontaneous and endothermic. In addition, the reusability performance of the Fe3O4@(St–DVB) magnetic porous microspheres was demonstrated by four repeated cycles.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 11
·3125-3132
·
IF 5.934
Qian Wang,Lei Wang,Xiaoyu Zhao,Ling Huang,Daojiang Gao,Jian Bi,Xin Wang,Guohong Zou
By introducing Sb3+ cations with a stereochemically active lone pair in the sulfate system, two antimony fluoride sulfates with the same stoichiometric ratio, namely, K2SO4·(SbF3)2 and Rb2SO4·(SbF3)2, were successfully synthesized via mild hydrothermal reactions. The cooperative effects of the alkali metal cation size and lone pairs resulted in a different symmetry for these two title compounds. The compound K2SO4·(SbF3)2 crystallized in a centrosymmetric (CS) space group of P21/c, while Rb2SO4·(SbF3)2 crystallized in the noncentrosymmetric (NCS) space group of P21. Though both of these two compounds consisted of similar structural building units, [SbF3O2]4− tetragonal pyramid complexes and [SO4]2− tetrahedra, they displayed discrepant helix columns in the crystal structure due to the different steric hindrance forces produced by the alkali metal cations. The alkali metal cations K+/Rb+ provided a charge balance and connected the different helix columns to form the three-dimensional framework. The detailed characterizations revealed that Rb2SO4·(SbF3)2 was a potential ultraviolet nonlinear optical material. In addition, theoretical calculations were performed.
研究领域:
无机化学
·
晶体学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2014
·Vol. 36
·期 9
·1597-1605
·
IF 1.455
Ruxangul Jamal,Ahmat Ali,Li Zhang,Yakupjan Osman,Adalet Rahman,Tursun Abdiryim
Poly(3′,4′-ethylenedioxy-2,2′:5′,2″-terthiophene)/ZnO(poly(TET)/ZnO) composites with the ratio of poly(TET) and nano-ZnO from 3:1 to 1:3 were synthesized by hand grinding and ball milling methods, respectively. The photocatalytic activities of the composites were examined through the degradation processes of methylene blue (MB) solution under UV light irradiation, and the possible mechanism for the photocatalytic activity enhancement by synergetic effects between nano-ZnO and poly(TET) was proposed. The results showed that the strong interactions between the poly(TET) and nano-ZnO occurred in the case of ball milling method. The results also proved that the crystallinity of ZnO was not disturbed in both of methods, and the nano-ZnO was uniformly distributed in polymer matrix in the case of ball milling method. The comparative studies showed that the addition of the nano-ZnO could enhance the photocatalytic activities of the composites. The highest degradation efficiency (100%) at 3 h under UV light irradiation occurred in the case of poly(TET)/ZnO(1:1) synthesized by ball milling method. Furthermore, the nanocompsosite displayed higher photocatalytic activity than nano-ZnO, which was due to the holes ( h + ) transferring from the valence band of ZnO to the polymer backbone and the adsorption of MB molecules in polymer matrix via π–π conjugation between MB and aromatic regions of the poly(TET). POLYM. COMPOS., 36:1597–1605, 2015. © 2014 Society of Plastics Engineers
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Carbon Capture Science & Technology
·
2024
·
IF 10.4
Xiaobin Zhou,Yunqiong Tang,Chao Liu,Shengpeng Mo,Yinming Fan,Dunqiu Wang,Bihong Lv,Yanan Zhang,Yinian Zhu,Zongqiang Zhu,Guohua Jing
To tackle the prevalent challenges encountered with polyamine-based non-aqueous absorbents (NAAs), particularly the formation of viscous products and inferior regeneration performance, this study proposed an innovative synergistic regulation strategy that integrated 2-amino-2-methyl-1-propanol (AMP) and n-propanol (NPA). Accordingly, a novel tertiary tetraethylenepentamine (TEPA)-AMP-NPA (T-A-N) NAA was devised. The optimized T-A-N maintained complete homogeneity throughout the entire CO 2 absorption process and achieved an impressive CO 2 loading of 1.15 mol·mol −1 while maintaining a low viscosity of merely 22.47 mPa·s. Remarkably, its absorption capacity showed little decrement after four consecutive absorption-desorption cycles, underscoring its exceptional recyclability. Within the T-A-N system, AMP underwent a reaction with CO 2 , yielding AMP-carbamate and protonated AMP, while TEPA engaged in CO 2 absorption to form zwitterionic carbamates. During the desorption process, NPA served as a regeneration activator, facilitating the conversion of stable TEPA-carbamates into less stable alkyl carbonate intermediates, thereby enhancing the T-A-N's regeneration performance. Moreover, the T-A-N system addressed the issue of TEPA-carbamate self-aggregation into insoluble gelatinous substances by leveraging the synergistic enhancement effects between AMP derivatives and NPA. Specifically, these components effectively bound TEPA-carbamate species via robust electrostatic affinity and intermolecular hydrogen-bond interactions, inhibiting their self-aggregation and preventing the formation of insoluble products. Furthermore, T-A-N exhibited a significant reduction in both sensible and latent heat requirements, by 67 % and 82 % respectively, compared to 30 wt% MEA, highlighting its advantageous energy-saving potential for CO 2 capture. Overall, harnessing the synergistic enhancement effects of AMP and NPA was conducive to the development of polyamine-based NAAs that offered superior CO 2 capture reversibility, low energy consumption, and resistance to insoluble product formation.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Yaozhu Fan,Xuefeng Wang,Yiyan Li,Lingfei Li,Yang Tian
The hypoglycemic peptide MoHpP-2 from Moringa oleifera seeds exhibits excellent α-glucosidase inhibitory activity, but its amelioration in insulin resistant (IR) cells and type 2 diabetes mellitus (T2DM) mice is still unclear. Therefore, the present study aimed to investigate the hypoglycemic effect of MoHpP-2 on C2C12/IR cells, and gut microbiota and metabolite changes of T2DM mice using 16S rRNA high-throughput sequencing and metabolomics. MoHpP-2 within the concentration range could effectively enhance the glucose consumption levels and antioxidant capacity in C2C12/IR cells. MoHpP-2 intervention improves the blood sugar levels, liver function, and organ indices, reverses oxidative damage, and enhances the antioxidant capacity of T2DM mice. Furthermore, it increases the diversity of cecum microorganisms, decreases the ratio of Firmicutes to Bacteroides and some pathogenic bacteria , and reshapes the gut microbial composition of T2DM mice. Moreover, the metabolomic analysis results showed that MoHpP-2 intervention might promote unsaturated fatty acid biosynthesis, inhibit bile acid formation, and regulate linoleic acid metabolism and amino acid metabolism related to oxidative stress, thereby improving insulin resistance and sensitivity in T2DM mice. Overall, the experimental results provide insights into the hypoglycemic effect of MoHpP-2 in vitro and in vivo and its application in hypoglycemic functional food products.
研究领域:
药理学
·
营养学
·
微生物学
·
代谢组学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 9
·6626-6635
·
IF 4.123
Yuanyuan Zhou,Hui Tang,Peiyi Wu
Temperature-induced phase transition together with the liquid–liquid phase separation (LLPS) phenomenon of poly(oligo(2-isopropyl-2-oxazoline)methacrylate) with the comb-shaped architecture (comb-PiPOx) in aqueous solution has been discussed at the molecular level. Differing from linear poly(2-isopropyl-2-oxazoline) (linear-PiPOx), polymer-rich liquid droplets appear at higher temperature compared with the phase transition determined by differential scanning calorimetry (DSC) in comb-PiPOx solution. As investigated using variable-temperature Fourier transform infrared (FTIR) spectra analysis, the densely grafted architecture gives rise to an intra-molecular interaction (hydrophobic interaction of alkyl groups and H-bond of carbonyl groups) dominating the dehydration process of comb-PiPOx. With temperature increment, most of the water within hydrated polymers is expelled to the outer water phase through intra-molecular association, corresponding to the transition temperature. Afterwards, the dehydration of methyl groups on side chain ends reflects the massive aggregation of polymer chains through inter-molecular association, accompanied by hysteretic LLPS.
研究领域:
高分子化学
·
物理化学
✓ 已验证
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 24
·期 3
·681-690
·
IF 3.545
Yunping Zhoujin,Yuping Li,Mingtao Zhang,Sean Parkin,Ju Guo,Tonglei Li,Faquan Yu,Sihui Long
2-((2,6-Dichlorophenyl)amino)benzoic acid (2-DCABA), a potential non-steroidal anti-inflammatory drug and an analog of 2-((2,6-dimethylphenyl)amino)benzoic acid (HDMPA) was synthesized and its polymorphism was studied to investigate the effect of double Cl–CH3 exchange. Three forms-two polymorphs (I and II) and one cocrystal salt (S)-were obtained through polymorph screening in a variety of solvents, and the elusive single crystals of form II of HDMPA were harvested through melt crystallization. The crystal forms were characterized by single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), DSC, and FT-IR. Isomorphism and isostructurality were observed between the form I of each system. The polymorphism of 2-DCABA seems to stem from the conformational flexibility of the molecule, similar to that of HDMPA. Hirshfeld analysis revealed different intermolecular interactions contributing to the stability of the crystal form I of 2-DCABA and HDMPA-I, despite their structural similarity.
研究领域:
药物化学
·
晶体学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 13
·6133-6150
·
IF 4.4
Zhao Jihe,Hu Jiwen,Dong Yonglu,He Daguang,Gui Xuefeng,Cui Xiaohua,Tu Yuanyuan,Lin Shudong
Thermal runaway accidents have occurred mainly during storage and transportation of azo compounds because large amounts of heat were released during the course of thermal decomposition. In this study, the thermal runaway characteristics of 2,2′-azobis(2-methylbutyronitrile) (AMBN) were first comprehensively investigated via differential scanning calorimetry (DSC), accelerating rate calorimetry (ARC), and gas chromatography/mass spectrometry (GC-MS). The onset temperature ( T on ), heat of decomposition ( Q ), and adiabatic temperature rise (Δ T ad ) were determined, which were involved in the safety of storage and transportation. Corresponding thermokinetic analyses were performed using DSC and ARC data. The data obtained from the experiments and calculation were utilized to predict the self-accelerating decomposition temperature (SADT), the control temperature ( T NR ), and the emergency temperature ( T C,I ). In addition, the flammable components in the pyrolysis products of AMBN were studied, particularly mixed with incompatible materials, such as HCl, NaOH, and Fe 2 O 3 , which helped predict the risk of thermal runaway during storage and transportation. Graphical Abstract
研究领域:
化学工程
·
安全科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CELLULAR BIOCHEMISTRY
·
2018
·Vol. 120
·期 5
·7602-7611
·
IF 2.959
Xiaolin Wang,Teng Ma,Xiaojian Wan,Yan Meng,Zhenzhen Zhao,Jinjun Bian,Rui Bao,Xiaoming Deng,Tao Yang
IGFBP7 as an early biomarker has been used to identify patients at risk of developing acute kidney injury (AKI). Nevertheless, its role in AKI remains obscure. The aim of our study is to determine the role and mechanism of IGFBP7 in lipopolysaccharide (LPS)-induced HK-2 cells in vitro and on sepsis-induced AKI by cecal ligation and puncture (CLP) in vivo. Here, we identified that IGFBP7 expression was increased in patients with AKI and HK-2 cells with LPS (1, 2, and 5 μg/mL) induction. HK-2 cells with LPS induction showed cell cycle arrest at G1-G0 phases and cell apoptosis and activated ERK1/2 parallel with the changes in the proteins belonging to the ERK1/2 pathway, including Cyclin D1, P21, Bax, and Bcl-2, which were inhibited by the IGFBP7 knockdown. Moreover, IGFBP7 overexpression significantly induced cell cycle arrest at G1-G0 phases and cell apoptosis of HK-2 cells, which were inhibited by PD98509, an ERK1/2 signaling inhibitor. IGFBP7 knockdown effectively alleviated the severity of the renal injury, evidenced by decreases in the urinary levels of creatinine, blood urea nitrogen, and albumin, cell apoptosis, and activation of ERK1/2 signaling in CLP mice. Taken together, our findings indicate that IGFBP7 regulates sepsis-induced AKI through ERK1/2 signaling.
研究领域:
肾病学
·
分子生物学
·
细胞生物学
·
传染病学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2016
·Vol. 18
·期 10
·3075-3081
·
IF 8.506
Dezhang Ren,Zhiyuan Song,Lu Li,Yunjie Liu,Fangming Jin,Zhibao Huo
A novel approach for the production of 2,5-hexanedione (HDN) and 3-methyl-2-cyclopenten-1-one (3-MCO) from 5-hydroxymethylfurfural (HMF) by water splitting with Zn is reported for the first time. The use of high temperature water (HTW) conditions is the key for the efficient conversion of HMF to HDN and 3-MCO. Parameters regarding the Zn amount, temperature and reaction time are optimized and HDN and 3-MCO are produced in 27.3% and 30.5% yields, respectively. The roles of HTW and ZnO obtained by oxidation of Zn in water for the conversion of HMF, together with intermediate structures, are discussed to understand the mechanism of the reaction.
研究领域:
化学工程
·
有机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）