JOURNAL OF CHEMICAL THERMODYNAMICS
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2022
·
IF 3.269
Pan Zhang,Yanxi Ji,Wenya Li,Lihua Xu,Lemeng Wang,Dong Fu
The viscosities of N -(2-aminoethyl)ethanolamine (AEEA), 1,4-butanediamine (BDA) and N-methyl- 1,3-propane- diamine (MAPA) activated 2- diethylaminoethanol (DEAE) aqueous solutions were measured at temperatures ( T ) from 303.2 K to 323.2 K, respectively. The DEAE mass fractions ( w DEAE ) and the other three amines ( w AEEA / w BDA / w MAPA ) are 0.300 to 0.500 and 0.050 to 0.150 respectively. The Weiland equation was used to calculate the viscosity of these three solutions, and the calculation results were satisfied with data of the experimental results. With the aid of experimentally determined viscosity data, the activation energy ( E a) of these three solutions was predicted through the Arrhenius formula. With the help of the viscosity data and the diffusion coefficient model of CO 2 in water, the CO 2 diffusion coefficient ( D CO2 ) in these three solutions was calculated. The quantitative relationship between the calculated values (viscosity, activation energy and diffusion coefficient) and the operation conditions (solution mass fraction and temperature) was analyzed. Our results show that the DEAE-BDA absorbent has better application potential due to its lower viscosity, higher CO 2 diffusion coefficient and lower activation energy.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Jing Li,Xiaorui Yan,Yujing Ren,Tiantian Liu,Kairui Li,Haisheng Wei
Design of metal Co-based catalysts by different strategies has aroused many attentions in the chemoselective hydrogenation of nitroarenes to improve their catalytic performance. Herein, Co(6)-N-C catalyst with highly dispersed metal Co and Co-N species was synthesized by the assistance of formed Zn species, which exhibits better performance than single atom Co catalyst in the selective hydrogenation of 3-nitrostyrene, in which the increasing of hydrogenation activity is usually accompanied by unsatisfactory selectivity. In this work, Co(6)-N-C catalyst obtains 98.5 % conversion and > 99 % selectivity of 3-vinylaniline, as well as excellent cyclic stability and desirable substrate universality for the hydrogenation of other substituted nitroarenes. It is demonstrated that the good performance is ascribed to the synergy of metallic Co and Co-N species in the Co(6)-N-C catalyst, improving the activity and selectivity. This work provides a novel strategy to construct an efficient Co-based catalyst for enhanced hydrogenation performance.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
VACUUM
·
2024
·
IF 3.8
Xiaoying Yu,Chunhong Gao,Jinjia Liu,Jiang Wang,Meilin Jia,Gala Sa,Aiju Xu
Photocatalytic technology has good stability and ecological friendliness which is used to treat organic pollutants in wastewater. In this paper, TiO 2 , 1.5%V–TiO 2 and N, V co-doped TiO 2 were synthesized by hydrothermal method for photocatalytic degradation of tetracycline. Meanwhile, XRD , HRTEM , SEM, FT-IR, XPS, UV–Vis DRS , PL and electrochemistry tests were used to characterize the catalysts. The results showed that the appropriate amount of N, V co-doped can cause structural changes of TiO 2 . The co-doped of N and V enhanced the photocurrent response of TiO 2 , increased the specific surface area, reduced the band gap, and improved the efficiency of photodegradation of tetracycline. Accordingly, the tetracycline photocatalytic degradation path was proposed. 6%N-1.5%V–TiO 2 completely degraded tetracycline into CO 2 , H 2 O and NO 3 − . The calculation results show that an appropriate amount of N, V co-doped TiO 2 decreased bandgap, improved the optical absorption performance of TiO 2 . This work demonstrated the potential of N, V co-doped to design efficient photocatalysts .
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2024
·
IF 2.8
Ting-ting Yan,Yi-fei Xu,Dong-yang Xi,Zhiqing Yu,Long Ma,Dan-dan Zhang,Ran Jiang
The study investigated the behavior of N-nitropyrazole (1-NP, C 3 H 3 N 3 O 2 ) under high pressure using a diamond anvil cell, Raman spectroscopy, and simulation calculations. The pressure–volume relationship of the sample, molecular interactions, and changes in optical Raman were analyzed. The Raman experiments revealed abnormal vibration intensities and a discontinuity in peak position at 2.2 GPa. For instance, the C-H stretching vibration produces a new vibration peak under pressure, and the NO 2 torsion mode continues to red shift beyond 2.2 GPa. These observations suggest that the crystal’s phase transition results from the distortion of its hydrogen-bonded network structure. The pressure relief experiment confirms the reversibility of the phase transition.
研究领域:
化学
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材料科学
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DOI
高影响因子
CHIRALITY
·
2024
·Vol. 36
·期 2
·e23643
·
IF 2.8
Xiaojun Li,Qi Li,Liying Yang,Liqin Huang,Chenchen Peng,Jianyong Zheng
In this study, lipase-catalyzed resolution of N-acetyl-DL-methionine methyl ester (N-Ac-DL-MetOMe) was evaluated. A lipase from Brucella thiophenivorans was prone to exhibit high activity and excellent enantioselectivity toward N-Ac-DL-MetOMe to produce the key chiral intermediate N-acetyl-L-methionine methyl ester (N-Ac-L-MetOMe). The results showed that the enzymatic reaction was carried out in 100 g/L racemic substrate for 2 h, the conversion reached 51.3%, the enantiomeric excess value N-Ac-L-MetOMe exceeded 99%, and the enantiomeric ratio value >200. Therefore, the lipase from B. thiophenivorans has potential prospects for the resolution of N-Ac-DL-MetOMe to produce the important intermediate N-Ac-L-MetOMe.
研究领域:
生物催化
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酶工程
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有机化学
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2013
·Vol. 37
·期 8
·2537-2540
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IF 2.966
Songbai Liu,Jiahui Zhou
Surfactants have long been underestimated in synthetic organic chemistry despite their great potential in promoting solubility, reactivity and selectivity in metal-mediated cross-couplings. In this study the strategy of surfactant promotion was exemplified in copper-catalyzed N-arylation of indoles in water. The different effects of surfactants during the coupling reaction were first explored. The superior promoting effect of the natural zwitterionic surfactant, betaine, was found and attributed to the capability of the formed complex to stabilize the copper intermediate in the catalytic transformation and facilitate transportation of the reactants. The concept of surfactant promotion through complexation is valuable in metal-mediated cross-couplings. This method also exhibited good recycling ability. This study will greatly facilitate exploration of surfactant promotion in metal-mediated cross-couplings.
研究领域:
有机化学
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合成化学
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DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Yujun Zhang,Shenghua Ye,Min Gao,Yong Li,Xuan Huang,Jun Song,Hong Cai,Qianling Zhang,Junmin Zhang
Heterogenization of homogeneous catalysis through supported single-atom catalysts (SACs) provided a feasible solution to recycling catalysts while keeping its efficiency in chemical synthesis. In this work, Cu SACs anchored on N-doped graphene (Cu SACs/NG) were prepared and first used for C–N coupling reactions. During the preparation, Cu–N–C structures, including Cu–N4 moieties, were formed in a one-step pyrolysis method. As-prepared Cu SACs/NG exhibited excellent catalytic activity toward C–N coupling reactions with a broad scope of substrates and showed outstanding performance of recycling. Compared with Cu nanoparticles (Cu NPs/NG), the advantages of single-atom catalysts were validated via experimental and theoretical calculations. The enhanced performances were attributed to increasing the number of active sites and increasing the intrinsic activity of each active site. This work provides an alternative synthetic strategy for fabricating atomically dispersed SACs and represents a significant advance for coupling reactions.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2022
·Vol. 414
·期 5
·1881-1890
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IF 4.478
Wu Yike,Liu Yuanyuan,Shang Zhengjun,Liu Xin,Xu Yong,Liu Wenlan
Aberrant protein N-glycosylation is one of the hallmarks of malignancy, while its role in oral cancer (OC) progression is still poorly understood making it a perfect biomarker for early-stage cancer. In this work, we describe a MALDI-MS-based N-glycomic analysis with multivariate data analysis approach for exploration and classification of the patients with OC. Various statistical analyses were used to determine differential N-glycome profiles. There were 8 glycan structures significantly increased ( p < 0.05) in all OC-derived microvesicles (MVs). Importantly, the increases in these glycans were significantly greater in the early stage of OC than those in the advanced stage of OC. Additionally, N-glycomic profiles from the serum were also performed, demonstrating a significant change of 11 glycan structures ( p < 0.05). Our data highlighted the effectiveness approach of MALDI-MS-based MV N-glycomic profiling on OC screening, and presented strong potential for further identifying targeted glycoproteomics signatures of the cancer.
研究领域:
生物化学
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肿瘤学
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分子生物学
✓ 已验证
DOI
PubMed
高影响因子
TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY
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2016
·
IF 0.634
Xirui Lv,Yue Zhou,Anguo Zhang,Lihong Zhou,Qingle Zeng
A straightforward and environment-friendly protocol for the synthesis of valuable chiral N-(tert-butylsulfinyl)imines has been developed. Different from traditional process with benzaldehydes as substrates, arylmethyl alcohols, benzylthiol, dibenzyl ether, thioether, and disulfide are used as alternative substrates to react with tert-butanesulfinamide in the presence of KOtBu under air for the synthesis of chiral N-(tert-butylsulfinyl)imines. This is a transition metal-free, mild, cost-effective, and simple process.
研究领域:
有机化学
·
环境化学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2016
·Vol. 7
·期 20
·3423-3433
·
IF 5.687
Ke Wang,Zefeng Song,Chonggao Liu,Wangqing Zhang
The thermo- and pH/CO2-responsive poly[N-[2-(dialkylamino)ethyl]acrylamide]s containing a polyacrylamide backbone but different N-substitutes of dialkylamine were synthesized and their solution properties were comparatively checked. A controllable RAFT synthesis of poly[N-[2-(dialkylamino)ethyl]acrylamide]s was achieved when a typical trithiocarbonate containing an easily cleavable R group was employed. The RAFT polymerization rate decreases with the increasing C-number in the N-substitutes. The thermo- and pH/CO2-responsive property of poly[N-[2-(dialkylamino)ethyl]acrylamide]s is firmly correlative to the N-substitutes. With the C-number in the R-substitute increasing, the solution properties of poly(N-[2-(dialkylamino)ethyl]acrylamide)s undergo a soluble-to-thermoresponsive-to-insoluble evolution, and the critical pH of poly[N-[2-(dialkylamino)ethyl]acrylamide]s gradually decreases. The dialkylamine moieties in the poly[N-[2-(dialkylamino)ethyl]acrylamide]s lead to a characteristic CO2-response during CO2/N2 bubbling. The present study reveals the structure-dependent solution properties of the thermo- and pH/CO2-responsive poly[N-[2-(dialkylamino)ethyl]acrylamide]s, and these multistimuli-responsive polymers are believed to be very useful due to the controllable RAFT synthesis and tunable solution properties.
研究领域:
高分子化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Mingming Du,Anxian Peng,Hongyue Liu,Huimei Chen,Qiyun Li,Zheng Fang,Ganning Zeng,Rongjun Yan
The well-designed internal electric field (IEF) with band bending effects will effectively accelerate the separation and transfer of photogenerated charges to foster a photocatalytic performance. Hence, in this work, the IEF-induced BiOCl/TiO2 p-n heterojunctions are prepared through the hydrothermal method for photocatalytic H2O2 production. The BiOCl/2TiO2 composite performed a superior H2O2 yield of 4.75 mM h–1, which is 4 times higher than that of pristine BiOCl. The p-n heterojunction mechanism was investigated via XPS and photoelectrochemical property tests, in which BiOCl/2TiO2 showed the highest photogenerated charge separation efficiency for boosting photocatalytic activity. This work provided an effective strategy for the design of p-n heterojunction photocatalysts to enhance photocatalytic performance.
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
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 10
·e4483
·
IF 3.581
Xufeng Wu,Lingyu Li,Wenlong Jiang,Lihong Zhou,Qingle Zeng
Tosylhydrazones are a kind of labile and highly reactive compounds, which are apt to be transformed into reactive diazo compounds and then into extremely reactive carbenes under the basic condition. In order to fulfil the valuable C-N coupling reaction, diaryliodonium salts are evaluated and prove to be a class of efficient electrophiles. The reaction with ligand-free copper salt as catalyst shows a wide range of substrate scope. A plausible mechanism is proposed.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）