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S-doped carbon aerogels/GO composites as oxygen reduction catalysts

Journal of Energy Chemistry 2016年第2期25卷 234-243页

作者： mykola seredych Krisztina László Enrique Rodríguez-Castellón Teresa J.Bandosz The City College of New York and The Graduate Center of CUNY Department of Chemistry 160 Convent Avenue New York NY 10031 USA Department of Physical Chemistry and Materials Science Budapest University of Technology and Economics Budapest 1521 Hungary Departamento de Quimica Inorganica Universidad de Malaga Malaga 29071 Spain

Composites of carbon aerogel and graphite oxide（GO） were synthesized using a self-assembly method based on dispersive forces. Their surface was modified by treatment in hydrogen sulfide at 650 and800 ℃. The samples obtained were characterized by adsorption of nitrogen, TA-MS, XPS, potentiometric titration, and HRTEM and tested as catalysts for oxygen reduction reactions（ORR） in an alkaline medium.The synergistic effect of the composite（electrical conductivity, porosity and surface chemistry） leads to a good ORR catalytic activity. The onset potential for the composite of carbon aerogel heated at 800 ℃ is shifted to a more positive value and the number of electron transfer was 2e-at the potential 0.68 V versus RHE and it increased to 4e-with an increase in the negative values of the potential. An excellent tolerance to methanol crossover was also recorded.

关键词： Oxygen reduction reaction Carbon aerogel/GO composites Porosity Surface chemistry Specific interactions

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S掺杂纳米多孔碳的光催化活性:表面化学和孔隙率的重要性(英文)

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催化学报 2014年第6期35卷 807-814页

作者： Teresa J.Bandosz mykola seredych Department of Chemistry The City College of New York 160 Convent Ave New York NY 10031 USA

This minireview summarizes our recent findings on the photoactivity of S-doped nanoporous carbons. The materials were either synthesized from the sulfur-containing polymers or obtained by heat treatment of commercial carbon with hydrogen sulfide. Their surface was extensively charac terized from the points of view of its surface chemistry, porosity, morphology, and electronic properties. The carbons showed enhanced activity towards oxidation of arsine and removal of diben-zothiophenes from model diesel fuel. The latter were oxidized to various oxygen containing intermediates and the cleavage of C–C bonds in aromatic ring was detected when carbon with adsorbed species was exposed to UV or visible light. Irradiation resulted in generation of photocurrent in a broad range of wavelength. The presence of sulfur led to the reduction of oxygen and contributed to an increased capacitive performance. We link these effects to the presence of reduced sulfur in the small pores which enhances the dispersive interactions via inducing a positive charge to carbon atoms, to sulfur in oxygenated forms which contribute to Faradaic reactions and increase the polar interactions, and to the hydrophobicity of a surface in small pores where oxygen can be reduced by excited electrons from chromophoric-like sulfur containing groups.

关键词：光催化活性表面化学多孔碳孔隙率纳米掺杂色散相互作用聚合物合成

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A Sewage Sludge Derived Composite Material for Adsorption of Antibiotics – Kinetics

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Advances in Materials Physics and Chemistry 2012年第4期2卷 35-37页

作者： Pengfei Zhang Rui Ding mykola seredych Teresa J. Bandosz Department of Chemistry City College of New York New York NY 10031 USA Department of Earth and Atmospheric Sciences City College of New York New York NY 10031 USA

A novel sewage-sludge derived composite material was developed for the adsorptive removal of organic pollutants from water. In this study a batch adsorption study was carried out to examine the kinetics of antibiotics adsorption by this composite material. A pseudo-second order kinetics model fits the data extremely well, suggesting that chemical adsorption, rather than physical adsorption, is likely the main mechanism of the separation process.

关键词： Sewage Sludge Composite Material Adsorption Kinetics Antibiotics Wastewater Treatment

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