Synthesis of a flower-like MoS2/carbon nanocomposite with enhanced adsorption performance toward Eu(iii): the cooperative effects between S atoms and carboxyl groups

Combining experimental studies and theoretical calculations to investigate the performance and mechanism of a MoS2/carbon composite for the effective elimination of Eu(iii) from wastewater.

Download Full-text

Facile preparation of zeolite-activated carbon composite from coal gangue with enhanced adsorption performance

Chemical Engineering Journal ◽

10.1016/j.cej.2020.124513 ◽

2020 ◽

Vol 390 ◽

pp. 124513 ◽

Cited By ~ 11

Author(s):

Hui Li ◽

Feng Zheng ◽

Jing Wang ◽

Jianmin Zhou ◽

Xiaohui Huang ◽

...

Keyword(s):

Activated Carbon ◽

Carbon Composite ◽

Coal Gangue ◽

Adsorption Performance ◽

Facile Preparation ◽

Enhanced Adsorption

Download Full-text

Theoretical and experimental studies of palladium-catalyzed site-selective C(sp3)−H bond functionalization enabled by transient ligands

10.26434/chemrxiv.5717950 ◽

2017 ◽

Author(s):

Haibo Ge ◽

Lei Pan ◽

Piaoping Tang ◽

Ke Yang ◽

Mian Wang ◽

...

Keyword(s):

Bond Activation ◽

Theoretical Calculations ◽

Experimental Studies ◽

Bond Functionalization ◽

Aliphatic Ketones ◽

Site Selectivity ◽

Mechanistic Investigation ◽

Palladium Catalyzed ◽

Metal Catalyzed ◽

Site Selective

Transition metal-catalyzed selective C–H bond functionalization enabled by transient ligands has become an extremely attractive topic due to its economical and greener characteristics. However, catalytic pathways of this reaction process on unactivated sp3 carbons of reactants have not been well studied yet. Herein, detailed mechanistic investigation on Pd-catalyzed C(sp3)–H bond activation with amino acids as transient ligands has been systematically conducted. The theoretical calculations showed that higher angle distortion of C(sp2)-H bond over C(sp3)-H bond and stronger nucleophilicity of benzylic anion over its aromatic counterpart, leading to higher reactivity of corresponding C(sp3)–H bonds; the angle strain of the directing rings of key intermediates determines the site-selectivity of aliphatic ketone substrates; replacement of glycine with β-alanine as the transient ligand can decrease the angle tension of the directing rings. Synthetic experiments have confirmed that β-alanine is indeed a more efficient transient ligand for arylation of β-secondary carbons of linear aliphatic ketones than its glycine counterpart.

Download Full-text

The system of indicators of the quality of the carbon-carbon composite materials and technologies of their production

Informacionno-technologicheskij vestnik ◽

10.21499/2409-1650-2018-3-127-132 ◽

2018 ◽

pp. 127-132

Author(s):

T. N. Antipova ◽

D. S. Shiroyan

Keyword(s):

Composite Material ◽

Low Cost ◽

Experimental Studies ◽

Carbon Matrix ◽

Carbon Composite ◽

Optimal Number ◽

Laboratory Equipment ◽

Carbon Composite Material ◽

Carbon Composite Materials

The system of indicators of quality of carbon-carbon composite material and technological operations of its production is proved in the work. As a result of the experimental studies, with respect to the existing laboratory equipment, the optimal number of cycles of saturation of the reinforcing frame with a carbon matrix is determined. It was found that to obtain a carbon-carbon composite material with a low cost and the required quality indicators, it is necessary to introduce additional parameters of the pitch melt at the impregnation stage.

Download Full-text