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Synthesis of graphene oxides and carbon spheres for applications in the removal of water pollutants
( Shashi Prabha Dubey ),권영남,이창하 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Herein, we report the fabrication of different carbon materials, either bare or ornamented with metallic nanoparticles. Graphene oxide (GO) and carbon spheres (CS) were prepared separately followed by synthesis of graphene- metal nanocomposites and graphene-carbon sphere hybrid aerogel. Graphene-based metal and metal oxide composites were synthesized hydrothermally using NaBH4 as a reducing agent and sodium sorbate as a stabilizer. Graphene-carbon sphere hybrid aerogel decorated with silver nanoparticles was then synthesized by induced reduction and gelation of a mixture of GO and silver doped CS in an oil bath. The synthesized materials have been characterized by various spectroscopic analyses. The inactivation of E. coli, the catalytic degradation of 4-nitrophenol, and the adsorption of heavy metals and dye were examined. Disinfection, catalytic and adsorption ability of CNMs showed promising efficacy towards a variety of water contaminants.
Shashi Prabha Dubey,권영남,Thuy T.M. Nguyen,이창하 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
The aim of the present study is to synthesize dispersible reduced graphene oxide (RGO) viafunctionalization with metals and metal oxides and explore their potential applications in waterpurification. Graphene-based metal and metal oxide composites were synthesized hydrothermally usingsodium borohydride as a reducing agent and sodium sorbate as a stabilizer. Single (Ag, Cu2O, and Fe3O4)and bimetallic (Ag-Cu2O, Ag-Fe3O4, and Cu2O-Fe3O4) nanoparticles were incorporated on the surface ofRGO. The synthesized composites were characterized by various analytical methods. The inactivation ofE. coli, the catalytic degradation of 4-nitrophenol, and the adsorption of As(V) were examined using theRGO composites.
Raspberry derived mesoporous carbon-tubules and fixed-bed adsorption of pharmaceutical drugs
Shashi Prabha Dubey,권영남,이창하,Amarendra Dhar Dwivedi,Mika Sillanpaa,Lena Q. Ma 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Novel mesoporous carbon-tubules were prepared from wild plant leaves of Rubus idaeus (Raspberry) andtheir physicochemical characteristics were analyzed by spectroscopic and potentiometric titrationmethods. The developed carbon-tubules were applied for the aqueous phase decontamination of threepharmaceutical drugs. Ibuprofen, naproxen and clofibric acid were selected for the study. Batch andfixed-bed studies were performed to investigate the adsorption of selected pharmaceutical drugs. Mathematical modelings were applied to the experimental data in order to estimate the maximumadsorption capacity and evaluate the characteristics of the fixed-bed. Based on finding, the adsorptionmechanism was investigated by adsorbate and adsorbent physicochemical characteristics.