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Carbon/TiO<sub>2</sub> Prepared from Anatase to Pitch and their Photocatalytic Performance
Chen, Ming-Liang,Ko, Young-Shin,Oh, Won-Chun Korean Carbon Society 2007 Carbon Letters Vol.8 No.1
Carbon/$TiO_2$ composites were prepared by $CCl_4$ solvent mixing method with different mixing ratios. Since the carbon layers derived from pitch on the $TiO_2$ particles were porous, the Carbon/$TiO_2$ composite series showed a good adsorptivity and photo decomposition activity. The BET surface area for the carbon layer in the sample increases to increasing with pitch contents. The SEM results present to the characterization of porous texture on the Carbon/$TiO_2$ composite and pitch distributions on the surfaces for all the materials used. From XRD data, a weak and broad carbon peak of graphene with pristine anatase peaks were observed in the X-ray diffraction patterns for the Carbon/$TiO_2$. The EDX spectra show the presence of C, O and S with strong Ti peaks. Most of these samples are richer in carbon and major Ti metal than any other elements. Finally, the excellent photocatalytic activity of Carbon/$TiO_2$ with slope relationship between relative concentration (C/$C_0$) of MB and t could be attributed to the homogeneous coated pitch on the external surface by $CCl_4$ solvent method.
Chen, Ming-Liang,Bae, Jang-Soon,Yoon, Hee-Seung,Lim, Chang-Sung,Oh, Won-Chun Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.3
Three kinds of organometallic compounds (chromium acetylacetonate, magnesium acetate and vanadyl acetylacetonate) were used as transition metal precursor, titanium n-butoxide and multi-walled carbon nanotube as titanium and carbon precursor to prepare metal oxide-CNT/$TiO^2$ composites. The surface properties and morphology of metal oxide-CNT/$TiO^2$ composites were by Brauer-Emett-Teller (BET) surface area measurement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy dispersive X-ray (EDX) analysis. The photocatalytic activity of prepared metal oxide-CNT/$TiO^2$ composites was determined by the degradation effect of methylene blue in an aqueous solution under irradiation of visible light.
Synthesis and Characterization of Metal (Pt, Pd and Fe)-graphene Composites
Chen, Ming-Liang,Park, Chong-Yeon,Choi, Jong-Geun,Oh, Won-Chun The Korean Ceramic Society 2011 한국세라믹학회지 Vol.48 No.2
In this study, we prepared graphene by using the modified Hummers-Offeman method and then introduced the metals (Pt, Pd and Fe) for dispersion on the surface of the graphene for synthesis of metal-graphene composites. The characterization of the prepared graphene and metal-graphene composites was performed by X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis and transmission electron microscopy (TEM). According to the results, it can be observed that the prepared graphene consists of thin stacked flakes of shapes having a well-defined multilayered structure at the edge. And the metal particles are dispersed uniformly on the surface of the graphene with an average particle size of 20 nm.
Synthesis and Characterization of Metal (Pt, Pd and Fe)-graphene Composites
Ming-Liang Chen,박종영,최종근,오원춘 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.2
In this study, we prepared graphene by using the modified Hummers-Offeman method and then introduced the metals (Pt, Pd and Fe) for dispersion on the surface of the graphene for synthesis of metal-graphene composites. The characterization of the prepared graphene and metal-graphene composites was performed by X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis and transmission electron microscopy (TEM). According to the results, it can be observed that the prepared graphene consists of thin stacked flakes of shapes having a well-defined multilayered structure at the edge. And the metal particles are dispersed uniformly on the surface of the graphene with an average particle size of 20 nm.
Ming-Liang Chen,Won-Chun Oh 한국탄소학회 2007 Carbon Letters Vol.8 No.2
In this work, activated carbon (AC) after HNO3 modification was used as the support during the production of supported TiO2 to increase the high deposition efficiency and the photocatalytic activity. The results of N2 adsorption showed that the BET surface area of samples decreased with an increasing of the concentration of HNO3 due to the penetration of TiO2. From XRD data, a single crystal structure of anatase peak was observed in diffraction patterns for the AC coated with titanium complexes. From the SEM results, almost all particles were aggregated with each other at the carbon surface and AC was covered with TiO2 particles in all of the samples. The EDX spectra show the presence of C, O, Ti and other elements. It was also observed a decreasing of amount of C content with increasing Ti and O content from the EDX. The results of FT-IR revealed that the modified AC contained more surface oxygen bearing groups than that of the original AC. The effect of surface acidity and basity calculated from Boehm titration method was also evaluated from correlations as a function of NaOH, NaHCO3, and Na2CO3 uptake. The surface modification of AC by HNO3 leads to an increase in the catalytic efficiency of AC/TiO2 catalysts, and the catalytic efficiency increases with increasing of HNO3 concentration.
Ming-Liang Chen,Chang-Sung Lim,Won-Chun Oh 한국탄소학회 2007 Carbon Letters Vol.8 No.3
[ TiO2 ]ACF composites were prepared by the electrochemical method with Titanium (IV) n-butoxide (TNB) electrolyte under different electrochemical operation time. The BET surface area for TiO2/ACF composites decrease with the increase of electrochemical operation time. There is a single crystal structure which is anatase in all of the samples from the data of XRD. The SEM micrphotographs of TiO2/ACF composites show that the TiO2 particles were well mixed with the ACF. There are O and P with strong C and Ti peaks in all samples from EDX results, and it also shows that a decrease of the C content with a increasing of Ti content with increasing of the electrochemical operation time in the over all composites. DSC cures show that the exothermic peak of all composites at 560℃ represents the transformation heat of amorphous parts to anatase phase and the discontinuous grain growth of the transformed anatase particles. Finally, the excellent photoactivity of TiO2/ACF composites (especially, ACFT10) could be attributed that the decrease of concentration of MB can be concluded to be much faster for the adsorption by ACF than for photocatalytic decomposition by TiO2.
Ming-Liang Chen,배장순,Hee-Seung Yoon,임창성,오원춘 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.3
Three kinds of organometallic compounds (chromium acetylacetonate, magnesium acetate and vanadyl acetylacetonate) were used as transition metal precursor, titanium n-butoxide and multi-walled carbon nanotube as titanium and carbon precursor to prepare metal oxide-CNT/TiO_2 composites. The surface properties and morphology of metal oxide-CNT/TiO_2 composites were by Brauer-Emett-Teller (BET) surface area measurement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and energy dispersive X-ray (EDX) analysis. The photocatalytic activity of prepared metal oxide-CNT/TiO_2 composites was determined by the degradation effect of methylene blue in an aqueous solution under irradiation of visible light.