JOURNAL OF MOLECULAR STRUCTURE
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2021
·
IF 3.196
Chenli Wei,Zeyu Guo,Yongjie Li,Jie Huang
A new nitrogen-rich energetic complex Cd(DMF) 2 BTZAF (1) (DMF= N,N-Dimethylformamide, H 2 BTZAF= 3, 3′-bis(1H-tetrazol-5-yl)-4, 4′-azofurazan) was first synthesized by the reaction of Cd(NO 3 ) 2 ·4H 2 O with 4-amino-3-(5-tetrazolate)-furazan. The compound 1 was characterized by elemental analysis and FT-IR spectrum analysis, respectively. The crystal structure of complex 1 was determined by single-crystal X-ray diffraction. It revealed that 1 crystallizes in the monoclinic space group P2 1 /c. A Cd 2+ ion is coordinated by four N atoms and two O atoms to form a distorted octahedral structure. Among them, four nitrogen atoms are from the four BTZAF 2− ions and the other two oxygen atoms are from two DMF molecules. Moreover, the thermal decomposition behavior of compound 1 was studied with DSC and TG-DTG methods. The non-isothermal kinetic parameters of compound 1 was calculated by Kissinger's method and Ozawa-Doyle's method. In addition, the thermal safety performance and the impact sensitivity of complex 1 were measured and calculated, and the results showed that the synthetic compound has good insensitivity and stability.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Pingping Yang,Xuejiao Hu,Yizhou Tu,Guizhou Xu,Lin Sun,Xianchuan Xie
Organic micropollutant in the aquatic environment has become a worldwide problem. In this study, a new DMpillar[5]arene-based porous organic polymer (DMPBP[5]) with the highest surface area of 1347.4 ± 39.3 m 2 g −1 is developed through Friedel-Crafts alkylation reaction between DMpillar[5]arene (DMP5) and 4,4′-bis(chloromethyl)-1,1′-biphenyl (BCMBP) to remove a wide range of organic micropollutants with fast removal rate and large uptake amounts. The synthesized DMPBP[5] can capture many types of organic pollutants in water including positively charged, negatively charged and neutral ones and those with different hydrophilicity, through host–guest interaction, hydrophobic interaction, electrostatic interaction and π-π interaction. For some pollutants, the adsorption kinetic constants of DMPBP[5] are thousands of times larger than that of activated carbon (AC) and even 10 4 -10 5 times larger than that of resin (XAD-4), and the adsorption capacities of DMPBP[5] are about 3 and 4 times higher than that of AC and XAD-4, respectively. The superior adsorption performance of DMPBP[5] is attributed to permanent porosity and accessible binding sites because of the introduction of rigid structure. Even at environmentally relevant concentrations, DMPBP[5] can quickly remove the pollutants simultaneously and can be easily regenerated with methanol under ambient conditions. In short, due to the wide adsorption range, excellent adsorption performance, and easy recyclability, DMPBP[5] is an excellent adsorbent for wastewater treatment with great application potential.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
·
IF 2.888
Chunli Zhi,Yang Tang,Jinru Wan,Xingming Liu,Honglin Chen,Xunqiu Wang
Isobaric vapour-liquid equilibrium data of {dimethyl succinate (DMS) + dimethyl glutarate (DMG) + dimethyl adipate (DMA)} ternary system was measured at 2 kPa, 5 kPa and 8 kPa with a dynamic recirculating apparatus and the temperature ranged from 364.46 to 403.55 K. The experimental data was correlated with NRTL, Wilson and Uniquac models. The results showed that the maximum value of the root mean square deviation of the vapour phase mole fraction of the ternary system correlated by the three models is 0.0083, 0.0076 and 0.0084, respectively. The vapour-liquid equilibrium data of the ternary system was predicted by the interaction parameters of NRTL, Wilson and the Uniquac models in the literature. The results showed that the maximum value of the root mean square deviation of the vapour phase mole fraction of the ternary system predicted by the three models is 0.0547, 0.0471, and 0.0498, respectively. The deviation between the experimental value and the regression value or the predicted value was small, and both met the needs of design calculation of the engineering separation. The results obtained from the regression of experimental values are significantly better.
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JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Wenbo Zhu,Yongzhong Jia,Jinhe Sun,Pengrui Zhang,Fei Shao,Yan Jing
A novel synergistic extraction system was studied for the separation of lithium isotopes using lithium salts solution as aqueous phase and dichloromethane containing 4′-acetylbenzo-15-crown-5 and [BMIm][NTf 2 ] as organic phase with solvent extraction method . The key factors such as anions of lithium salts, concentrations of LiNTf 2 , initial pH values of aqueous phase, solvents, volume ratio of dichloromethane and [BMIm][NTf 2 ] were investigated in this study. Results showed that the maximum extraction rate of lithium was 68.36% and the maximum single stage separation factor of 6 Li and 7 Li was 1.056 ± 0.002. The formed complex in organic phase was studied by the slope analysis method, which indicated that the complex was composed of Li-ion and 4′-actylbenzo-15-crown-5 by 1:1. The thermodynamic parameters of the 6 Li and 7 Li exchange reaction were calculated by data obtained on temperature during experiments, which explained that the exchange behavior of 6 Li and 7 Li in this system was a spontaneous exothermic reaction . In addition, this system was able to efficiently separate lithium isotopes at lower temperature.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Haiyan Jia,Taotao Yang,Quan Xu,Jingkun Xu,Limin Lu,Yongfang Yu,Ping Li
In this paper, core-shell structured poly (indole‑5‑carboxylic acid) @ poly (3, 4‑ethylenedioxythiophene) (PIn‑5‑COOH@PEDOT) composite was prepared by a facile two-step chemical oxidation method. The composite possesses large specific surface area, high stability, good electrical conductivity and redox activity, which was designed as label-free electrochemical immunosensing platform for the monitor of the prostate specific antigen (PSA). In this sensing system, PIn-5-COOH served as both signal molecule and antibody carrier. The coating PEDOT was used to enhance the conductivity and stability of PIn-5-COOH. Benefiting from the synergistic effects between PIn-5-COOH and PEDOT, the fabricated immunosensor exhibited a wide linear range of 0.01–25 ng mL −1 and low detection limit of 3.4 pg mL −1 (S/N = 3) for the assay of PSA, coupled with good selectivity, reproducibility and stability. The immunosensor is simple, sensitive, specific and reproducible, which could provide a potential approach for clinical diagnosis.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Xiaoli Zhang,Shuhua Shan,Hanqing Li,Jiangying Shi,Yang Lu,Zhuoyu Li
A novel peroxidase (FMBP) was extracted and purified from foxtail millet bran in our previous study and it possessed excellent anti-colon cancer activity both in vitro and in vivo . However, the active fragment of FMBP responsible for the anti-colon cancer effects remains unclear. In present, three different truncated sequences of FMBP were designed and cloned into a plasmid vector (pMal-s). Three recombinant segments were successfully expressed in host strain Escherichia coli DH5α induced by IPTG (0.3 mM) at 37 °C for 4 h, respectively named MBP-FMBP-1, MBP-FMBP-2 and MBP-FMBP-3. MTT assay showed that only MBP-FMBP-2 possessed significant anti-colon cancer activity, and its anti-colon cancer activity was equivalent to FMBP. Further, the results showed that MBP-FMBP-2 significantly reversed the 5-Fu resistance in human colorectal cancer HCT-8/Fu cell through inhibiting cell proliferation, promoting cell apoptosis and increasing the intracellular accumulation of 5-Fu. RT-PCR and western blot assays showed that MBP-FMBP-2 also decreased the expression levels of multi-drug resistance protein 1 (MRP1), P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP). These results indicate that MBP-FMBP-2 is the effective segment of FMBP which exhibits anti-colon cancer activity and has potential as an outstanding chemotherapeutic agent against colon cancer.
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PubMed
高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 3
·期 4
·1033-1041
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IF 4.912
Lei Hu,Xiaoli Dai,Ning Li,Xing Tang,Yetao Jiang
The catalytic transfer hydrogenation (CTH) pathway is a promising and appealing method for the selective hydrogenation of biomass-derived 5-hydroxymethylfurfural (HMF) into 2,5-bis(hydroxymethyl)furan (BHMF) via the Meerwein–Ponndorf–Verley (MPV) reaction, in which the development of effective and economical catalysts is of great significance. Herein, this work designed and prepared a new hafnium-based metal–organic coordination polymer (Hf-DTMP) by the simple assembly of hafnium tetrachloride (HfCl4) and diethylene triaminepenta(methylene phosphonic acid) (DTMP). Comprehensive studies demonstrated that Hf-DTMP is an amorphous and mesoporous catalyst with a strong acid–base bifunctionality, and so, it displayed excellent catalytic activity for the CTH of HMF into BHMF with a high yield of 96.8% in 2-butanol (sBuOH) at a moderate reaction temperature of 130 °C for 4 h. In addition, Hf-DTMP exhibited good heterogeneity, reusability and stability, and it could be easily recovered from the reaction mixture by filtration and consecutively used for at least 5 recycles without a dramatic loss in catalytic activity. More gratifyingly, Hf-DTMP also showed superior universality for the CTH of 5-methylfurfural (MF), furfural (FF), levulinic acid (LA), ethyl levulinate (EL) and cyclohexanone (CHN) into the corresponding products with high yields, obviously indicating that it has tremendous potential for the selective hydrogenation of various biomass-derived carbonyl compounds.
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NUCLEIC ACIDS RESEARCH
·
2019
·Vol. 47
·期 19
·e119
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IF 11.147
Chen Danping,Wang Yang,Mo Mingming,Zhang Junjie,Zhang Yanfei,Xu Yuzhi,Liu Si-Yang,Chen Jun,Ma Yingjun,Zhang Li,Dai Zong,Cai Chun,Zou Xiaoyong
The current methods for quantifying genome-wide 5-methylcytosine (5mC) oxides are still scarce, mostly restricted with two limitations: assay sensitivity is seriously compromised with cost, assay time and sample input; epigenetic information is irreproducible during polymerase chain reaction (PCR) amplification without bisulfite pretreatment. Here, we propose a novel Polymerization Retardation Isothermal Amplification (PRIA) strategy to directly amplify the minute differences between epigenetic bases and others by arranging DNA polymerase to repetitively pass large electron-withdrawing groups tagged 5mC-oxides. We demonstrate that low abundant 5-hydroxymethylcytosine (5hmC), 5-formylcytosine (5fC) and 5-carboxycytosine (5caC) in genomic DNA can be accurately quantified within 10 h with 100 ng sample input on a laboratory real-time quantitative PCR instrument, and even multiple samples can be analyzed simultaneously in microplates. The global levels of 5hmC and 5fC in mouse and human brain tissues, rat hippocampal neuronal tissue, mouse kidney tissue and mouse embryonic stem cells were quantified and the observations not only confirm the widespread presence of 5hmC and 5fC but also indicate their significant variation in different tissues and cells. The strategy is easily performed in almost all research and medical laboratories, and would provide the potential capability to other candidate modifications in nucleotides.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 9
·5439-5453
·
IF 1.674
Huang Feng,Li Wenzhi,Zhang Tingwei,Li Dawei,Liu Qiyu,Zhu Xifeng,Ma Longlong
A carbonaceous solid acid catalyst with high strong-acid density was synthesized by facile functionalization of a biomass-derived mesoporous carbon with benzenesulfonic acid. The catalyst was characterized by using Fourier transform infrared spectroscopy, elemental analysis, X-ray photoelectron spectroscopy, transmission electron microscopy, and N 2 adsorption–desorption. The carbonaceous solid catalyst containing Brønsted acid sites was used for the production of 5-hydroxymethylfurfural (HMF) from hexoses such as fructose, glucose, and cellulose in γ-valerolactone (GVL)-H 2 O mixture. By reaction at 130 °C for 20 min using fructose as a feedstock, an HMF yield 78.1% was achieved. The catalytic performance of the catalyst in conversion of fructose into HMF hardly changed over seven cycles, demonstrating that the catalyst had excellent recyclability. The yields of HMF derived from glucose and cellulose reached 33.2 and 22.5%, respectively, whereas those of total furans were 42.1 and 33.7%, respectively. The proposed reaction system was promising in transforming biomass-based carbohydrates into fine chemicals, given the use of green functionalization methods, the utilization of sustainable biomass-derived carbon precursor and solvents, catalyst with high acid density, and the availability of high HMF yield.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2018
·
IF 3.468
Changsong Hu,Huiyan Zhang,Rui Xiao
In order to inhibit the coke formation on the external surface of HZSM-5 during catalytic fast pyrolysis (CFP) of biomass, core-shell structured HZSM-5@silicalite-1 zeolite catalysts were hydrothermally synthesized through the growth of silicalite-1 along the surface of a commercial HZSM-5. The catalyst characterization results indicate that silicalite-1 outer shell layer was successfully formed on the HZSM-5 core particles. Silicalite-1 coating was proved to be effective to reduce the external acidity as well as keep the internal acidity and channel patency of core HZSM-5 by catalytic probe reactions. The catalytic performances of HZSM-5@silicalite-1 samples in CFP of biomass were investigated using a bench-scale continuous feeding two-stage fluidized-bed/fixed-bed combination reactor. The results show that the productions of olefins and BTX were promoted (especially BTX), while the formations of catalyst coke and PAHs were significantly inhibited after silicalite-1 coating.
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RSC Advances
·
2014
·Vol. 4
·期 103
·59175-59184
·
IF 3.708
Jianming Pan,Heping Gao,Yunlei Zhang,Jun Zeng,Weidong Shi,Changhua Song,Yongsheng Yan,Longbao Yu,Dandan Chang
This work addressed efficient one-pot conversion of cellulose to 5-hydroxymethylfurfural by porous solid acid in the presence of 1-ethyl-3-methyl-imidazolium chloride ([Emim]Cl). On the basis of stable water-in-oil pickering high internal phase emulsions (HIPEs), porous solid acid (HC-PDVB-SS-SO3H) was prepared by polymerizing divinylbenzene (DVB) and sodium p-styrenesulfonate (SS), succedent sulfonation in H2SO4 and hypercrosslinking process. HC-PDVB-SS-SO3H with a stable network exhibited mesopores within a macropore structure, high BET specific surface area and more super-strong acid sites. To test catalytic activity, the reaction conditions were optimized via response surface methodology, and the sequence of the three variables affecting HMF yield followed the order, temperature > reaction time > amount of catalyst. By comparing with the other as-prepared porous solid acid, it can also be concluded that BET specific surface area and super-strong acid site both played key roles in cellulose conversion. Moreover, HC-PDVB-SS-SO3H was very easily reused at least four times without significant loss of activity.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Hongtao Cui,Junying Xue,Wanzhong Ren,Minmin Wang
SnO 2 quantum dots are prepared at an ultra-large scale by a productive synthetic procedure without using any organic ligand. The grinding of solid mixture of SnCl 2 ⋅2H 2 O and ammonium persulphate with morpholine in a mortar at room temperature produces 1.2 nm SnO 2 quantum dots within 5 min. The formation of SnO 2 is initiated by the reaction between tin ions and hydroxyl groups generated from hydrolysis of morpholine in the released hydrate water from SnCl 2 ⋅2H 2 O. It is considered that as water is rapidly consumed by the hydrolysis reaction of morpholine, the growth process of particles is self-terminated immediately after their transitory period of nucleation and growth. As a result of simple procedure and high toleration to scaling up of preparation, at least 50 g of SnO 2 quantum dots can be produced in one batch in our laboratory. The as prepared quantum dots present high electrochemical performance due to the effective faradaic reaction and the alternative trapping of electrons and holes.
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