SOLVENT EXTRACTION AND ION EXCHANGE
·
2021
·
IF 2.513
Yifu Hu,Chuan Lu,Qi Chen,Yaoyang Liu,Yu Zhou,Caishan Jiao,Meng Zhang,Hongguo Hou,Yang Gao,Guoxin Tian
In this paper, pertraction of Nd(III) and U(VI) from nitric acid media through a flat-sheet supported liquid membrane (FSSLM) was studied by using a self-made liquid membrane device, respectively, with N, N’-dimethyl-N, N’-dioctyl-3-oxadiglcolamide (DMDODGA) diluted in 40/60 (V/V)% n-octanol/kerosene as the carrier. The effects of various factors, such as the acidity of the feed and stripping phases, neodymium concentration, uranium concentration, DMDODGA concentration are discussed. The optimized conditions for Nd(III) transport were found to be 3 M HNO3 in the feed phase, 0.5 M HNO3 in the stripping phase, 0.48 M DMDODGA in n-octanol/kerosene as the carrier. When the initial concentration of Nd(III) was 1 × 10−4 mol/L, the transport rate of Nd(III) was 86.4(±2.2)%. Compared with Nd(III), the liquid membrane was less effective in the transport of U(VI), the highest transport rate of U(VI) was 57.2 (±2.6)%.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2020
·Vol. 49
·期 2
·166-178
·
IF 1.273
Zhu Liqing,Liu Bijun,Yang Xia,Zhuo Liangang,Mu Wanjun,Chen Yue,Yang Yuchuan,Wei Hongyuan,Li Xingliang
Thermodynamic equilibria of complexes of 1,3-diamino-2-hydroxypropane- N , N , N ', N '-tetraacetic acid (DHPTA) with heavy lanthanides (Tb 3+ , Ho 3+ and Lu 3+ ) in aqueous solution have been investigated with potentiometry, spectrophotometry, luminescence spectroscopy and nuclear magnetic resonance spectroscopy (NMR). The results identified three 1:1 Ln/DHPTA (Ln: Tb 3+ , Ho 3+ and Lu 3+ ) complexes with different degrees of deprotonation, LnL − , Ln(H −1 L) 2− , and Ln(OH)(H −1 L) 3− , where H −1 represents the deprotonation of the hydroxyl group between two methyliminodiacetate groups in the DHPTA structure. The alkoxide form of the DHPTA hydroxyl group directly binds to the lanthanide atom, forming highly strong chelation. The complex of Ln(H −1 L) 2− could be present as a dimeric or polymeric complex in solution.
研究领域:
配位化学
·
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Huiqi Duan,Xiaoping Huang,Xiaoyu Cao,Zhanfang Cao,Hong Zhong,Jianxian Zeng,Hu Zhou,Jianrong Xue,Yuan Liu
Flotation collectors with strong collecting ability and superior selectivity have important application prospects for recovering complex and refractory copper sulfide resources. Herein, a novel surfactant of N-benzoyl-N’,N’-diethyl thiourea (BDETU) with C O and C S groups is synthesized for separation of chalcopyrite and pyrite. The flotation performance and adsorption mechanism of BDETU to chalcopyrite and pyrite were evaluated by flotation experimental, adsorption experimental, contact angle measurements, UV–vis spectroscopy, as well as FTIR analyses and DFT calculation. By comparing the flotation performances with the traditional flotation collector of O-isopropyl-N-ethyl thionocarbamate (IPETC), it becomes evident that BDETU exhibit stronger collecting ability and excellent selectivity for chalcopyrite against pyrite. These results might be attributed to the facts that BDETU can selectively adsorb on the surface of chalcopyrite and strengthen its surface hydrophobicity, while the hydrophobicity of pyrite surface is not improved with the weak adsorption of BDETU on its surface. The analyses of adsorption mechanism reveal that BDETU is chemically adsorbed on the surface of chalcopyrite by the reactions of the functional groups (C O and C S) to the copper species with the formation of C O Cu and C S Cu structures.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
·
2016
·
IF 0.661
Zhengyi Li,Yuan Chen,Yue Yin,Zhiming Wang,Xiaoqiang Sun
A simple and convenient two-step method has been developed and used to synthesise 25 (4 of which are novel) unsymmetrical N,N′-disubstituted thioureas in water. Alkylamines or variously substituted arylamines reacted smoothly with phenyl chlorothionoformate at room temperature to form thiocarbamates, which were then reacted with another alkyl- or arylamine in water at reflux to afford the unsymmetrical N,N′-disubstituted thioureas in good to excellent yields. Mild conditions, simple work-up, high yields as well as using water as solvent are the major advantages of the method.
研究领域:
有机化学
·
绿色化学
✓ 已验证
DOI
高影响因子
TETRAHEDRON
·
2020
·
IF 2.233
Zhen-Hua Li,Xiao-Meng Sun,Jin-Jing Qin,Zhi-Yong Tan,Wen-Biao Wang,Yao Ma
An efficient and divergent synthesis of N -arylbenzimidazoles and N -arylindazoles from arylamino oximes based on reaction conditions selection was developed. The synthesis was approached by treating oximes with BTC and the chemoselectivity was regulated by the amount of Et 3 N. This switchable N–N and N–C bond formation process features mild reaction conditions, simple execution, high chemoselectivity and broad substrate scope.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
·
2019
·Vol. 85
·期 12
·
IF 4.077
Xinyu Lu,Weiwei Wang,Lige Zhang,Haiyang Hu,Ping Xu,Tao Wei,Hongzhi Tang
N,N-Dimethylformamide (DMF) is one of the most common xenobiotic chemicals, and it can be easily emitted into the environment, where it causes harm to human beings. Herein, an efficient DMF-degrading strain, DM1, was isolated and identified as Methylobacterium sp. This strain can use DMF as the sole source of carbon and nitrogen. Whole-genome sequencing of strain DM1 revealed that it has a 5.66-Mbp chromosome and a 200-kbp megaplasmid. The plasmid pLVM1 specifically harbors the genes essential for the initial steps of DMF degradation, and the chromosome carries the genes facilitating subsequent methylotrophic metabolism. Through analysis of the transcriptome sequencing data, the complete mineralization pathway and redundant gene clusters of DMF degradation were elucidated. The dimethylformamidase (DMFase) gene was heterologously expressed, and DMFase was purified and characterized. Plasmid pLVM1 is catabolically crucial for DMF utilization, as evidenced by the phenotype identification of the plasmid-free strain. This study systematically elucidates the molecular mechanisms of DMF degradation by Methylobacterium.IMPORTANCE DMF is a hazardous pollutant that has been used in the chemical industry, pharmaceutical manufacturing, and agriculture. Biodegradation as a method for removing DMF has received increasing attention. Here, we identified an efficient DMF degrader, Methylobacterium sp. strain DM1, and characterized the complete DMF mineralization pathway and enzymatic properties of DMFase in this strain. This study provides insights into the molecular mechanisms and evolutionary advantage of DMF degradation facilitated by plasmid pLVM1 and redundant genes in strain DM1, suggesting the emergence of new ecotypes of Methylobacterium.
研究领域:
环境微生物学
·
生物化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 25
·期 10
·1435-1441
·
IF 1.174
Zhirong Chen,Weitao Yang,Hong Yin,Shenfeng Yuan
The uncatalyzed reaction of p -tolyl isocyanate ( p -TI) with water in N , N -dimethylformamide (DMF) was investigated by high performance liquid chromatography (HPLC). The reactions were carried out at different temperatures from 293 K to 323 K, using various molar ratios of water to p -TI. DMF, as a special amide , was proved to be an efficient catalyst for water–isocyanate reaction. Under the reaction conditions in this study, substituted urea was the only final product observed. An appreciable amount of intermediate p -toluidine was detected. Concentrations of the isocyanate group as well as the amine and urea were determined as a function of time. New kinetic equations were deduced for each of the substance on the basis of a multistep mechanism, instead of a simple second order reaction as usual. Kinetic constants were calculated using the software MATLAB . Furthermore, the effects of temperature and concentrations of reactants on the reaction rate and amine content were discussed. The activation energy of each step was also determined.
研究领域:
物理化学
·
有机化学
·
反应动力学
·
高分子化学
·
催化化学
·
分析化学
✓ 已验证
DOI
高影响因子
POLYMER SCIENCE SERIES B
·
2020
·Vol. 62
·期 5
·473-482
·
IF 0.976
Henglun Cheng,Shang Mengyao,He Yuan,Shentu Baoqing,Gao Zhuyi
Abstract A phenyl-substituted terephthalamide β-nucleating agent, N,N '-diphenylterephthalamide (DPTH) was synthesized and characterized by Fourier transform infrared spectroscopy (FTIR) and 1 H nuclear magnetic resonance ( 1 H NMR). DPTH’s effect on the crystallization and melting behaviors in isotactic polypropylene (iPP) was investigated by differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD) and polarizing optical microscope (POM). The results illustrated that DPTH was an effective β-nucleating agent for iPP. The relative content of β-crystal ( k β ) increased with the rise of the DPTH content and reached a maximum of 0.652 at 0.6% DPTH content. The Avrami and Jeziorny methods were used to describe the nonisothermal crystallization kinetics of iPP. Higher crystallization rate constant Z c and lower halftime of crystallization t 1/2 were obtained in iPP containing DPTH.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Dan Zhao,Yun Zhuang,Chunshan Fan,Xihui Zhang,Fang Yang,Yuhuan Chen
The densities of six binary systems containing N,N-dimethylcyclohexylamine (DMCA) and ethanol, n-propanol, iso-propanol, n-butanol, iso-butanol, or tert-butanol were reported in this work at temperatures ranging from (288.15 to 318.15) K and atmospheric pressure. According to the experimental density values, molar volume (Vm), thermal expansion coefficient (αp), and excess molar volume (VmE) were calculated. The results showed that VmE values were all negative over the entire composition. The minimum values of the six systems at 298.15 K were located at (−1.097, −1.094, −0.900, −1.033, −1.154, and −1.073) cm3·mol–1 at about xDMCA = 0.4, respectively. All these are dependent on intermolecular interactions and the steric structural effect. Furthermore, VmE variations with composition (xDMCA) as well as temperature were well fitted with the Redlich–Kister-type polynomial equation.
研究领域:
物理化学
·
热力学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Dandan Jiang,Yingzhen Zhang,Xin Qiao,Jun Xiao,Kunming Liu,Juanhua Li,Jinbiao Liu
An iron-catalyzed selective N═S coupling of N-methoxy amides and sulfoxides has been developed and was found to be a highly efficient method for the synthesis of N-acyl sulfoximines. Electron-donating as well as electron-withdrawing groups on the phenyl ring are tolerated, and even sensitive substituents are compatible. The current catalytic transformation was conducted under an air atmosphere and can be easily scaled up to a gram scale with a catalyst loading of only 1 mol %. In this case, both coupling partners are used in their native forms, thus obviating prior functionalization and activation.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2018
·
IF 3.972
Feng Chen,Chunxiang Xu,Qingyu Xu,Yizhi Zhu,Zhu Zhu,Wei Liu,Xiuxiu Dong,Feifei Qin,Zengliang Shi
CH3NH3PbBr3 single crystal, one of organometal halide perovskites, as novel optoelectronic and photovoltaic materials could be easily precipitated using an antisolvent method. Understanding of the growth mechanism will significantly improve reproducibility, quality, and controllability of the single crystals. However, it is difficult to capture the growth process due to the super solubility of CH3NH3PbBr3 crystals in N,N-dimethylformamide solution. Here, filter paper was used to separate the intermediate states of CH3NH3PbBr3 crystals out of N,N-dimethylformamide solution in the growth process. The developed fabrication approach can monitor the morphology evolution of CH3NH3PbBr3 single crystals as a whole. Meanwhile, the precursor solution’s properties and degradation of CH3NH3PbBr3 single crystals were also investigated systematically. It indicates that the CH3NH3PbBr3 single crystal growth process is similar to sodium chloride crystals grown from solution in the presence of nitrilotriacetamide. The results help us to deeply discern the growth mechanism of CH3NH3PbBr3 single crystal in N,N-dimethylformamide solution and design controllable optoelectronic devices.
研究领域:
材料科学
·
光电材料
·
晶体生长
✓ 已验证
DOI
高影响因子
Asian Journal of Organic Chemistry
·
2020
·Vol. 9
·期 7
·1076-1080
·
IF 3.13
Siyu Wu,Gengwen Yin,Caihong Cheng,Bo Liang,Haiquan Zhang
Graphical A new product -PDMBPRI-4F was synthesized by one-step method, which has the special property of fluorescence quenching caused by intramolecular charge transfer. Nucleophilic substitution process with loss of one fluorine atom was observed when pentafluorophenyl substituted benzo[ghi]perylene triimide and perylene diimide were heated in N , N -dimethylformamide, in which N , N -dimethylformamide acted both as solvent and nucleophile reagent. Unexpectedly, the obtained product exhibited significant intramolecular charge transfer optical properties in solutions. The mechanism of nucleophilic substitution and the influence of substituent were further studied and proposed in this manuscript.
研究领域:
有机化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）