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High photonic effect of organic dye degradation by CdSe–graphene–TiO2 particles
Trisha Ghosh,오원춘,조광윤,Kefayat Ullah,Vikram Nikam,박종연,Ze-Da Meng 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
Photocatalytic activity of CdSe (cadmium selenide) decorated graphene composites coupled with TiO2(titanium oxide) was investigated with organic dye solutions. The characterizations of composites were studied by X-ray diffraction (XRD), energy dispersive X-ray (EDX), scanning electron microscope (SEM),and with transmission electron microscope (TEM). The degradation of methyl orange (MO) and rhodamine B (RhB) was observed by measuring the decrease in the concentration by UV spectrophotometer. The synergistic effect of graphene on CdSe and TiO2 was demonstrated by comparative study. The composites were tested for recyclability, investigating the stability of CdSe–graphene/TiO2 composites.
박종연,최종근,Trisha Ghosh,,오원춘 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.5
In this study, CdS combined activated carbon/TiO_2 (CdS-AC/TiO_2) composites were prepared by a sol-gel method to improve the photocatalytic performance of TiO_2. These composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and UV-vis analysis. The photocatalytic activities were examined by the degradation of methylene blue (MB) under visible light irradiation. The photodegradation rate of MB under visible light irradiation reached 90.1% in 120 min. The kinetics of MB degradation was plotted alongside the values calculated from the Langmuir-Hinshelwood equation. The 0.2 CAT sample showed the best photocatalytic activity, which might be due to an increase in the photo-absorption effect by activated carbon and the cooperative effect of CdS.
Meng, Ze-Da,Ghosh, Trisha,Cho, Jung-Hwan,Zhu, Lei,Park, Chong-Yeon,Choi, Jong-Geun,Oh, Won-Chun The Korean Ceramic Society 2011 한국세라믹학회지 Vol.48 No.6
Activity carbon (AC), Cu and $Cu_2O$ modified $TiO_2$ composites (Cu/$Cu_2O$-AC/$TiO_2$) were prepared using a sol-gel method. The characteristics of the composites were evaluated using Brunauer-Emmett-Teller (BET) surface area measurements, X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis and scanning electron microscope (SEM) analysis. A methyl orange (MO) solution under visible light irradiation was used to determine the photocatalytic activity. The degradation of MO was determined using UV/Vis spectrophotometry. $Cu_2O$, Cu and the cooperative effect of the AC increased the photo-absorption effect, thus increasing in photocatalytic activity.
Ze-Da Meng,Trisha Ghosh,Lei Zhu,박종연,최종근,오원춘 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.6
Activity carbon (AC), Cu and Cu_2O modified TiO_2 composites (Cu/Cu_2O-AC/TiO_2) were prepared using a sol-gel method. The characteristics of the composites were evaluated using Brunauer-Emmett-Teller (BET) surface area measurements, X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis and scanning electron microscope (SEM) analysis. A methyl orange (MO) solution under visible light irradiation was used to determine the photocatalytic activity. The degradation of MO was determined using UV/Vis spectrophotometry. Cu_2O, Cu and the cooperative effect of the AC increased the photo-bsorption effect, thus increasing in photocatalytic activity.
Meng, Ze-Da,Cho, Sun-Bok,Ghosh, Trisha,Zhu, Lei,Choi, Jong-Geun,Park, Chong-Yeon,Oh, Won-Chun Materials Research Society of Korea 2012 한국재료학회지 Vol.22 No.2
AC and ZnS modified $TiO_2$ composites (AC/ZnS/$TiO_2$) were prepared using a sol-gel method. The composite obtained was characterized by Brunauer-Emmett-Teller (BET) surface area measurements, X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis, scanning electron microscope (SEM) analysis, and according to the UV-vis absorption spectra (UV-vis). XRD patterns of the composites showed that the AC/ZnS/$TiO_2$ composites contain a typical single and clear anatase phase. The surface properties as observed by SEM present the characterization of the texture of the AC/ZnS/$TiO_2$ composites, showing a homogenous composition in the particles showing the micro-surface structures and morphology of the composites. The EDX spectra of the elemental identification showed the presence of C and Ti with Zn and S peaks for the AC/ZnS/$TiO_2$ composite. UV-vis patterns of the composites showed that these composites had greater photocatalytic activity under visible light irradiation. A rhodamine B (Rh.B) solution under visible light irradiation was used to determine the photocatalytic activity. The degradation of Rh.B was determined using UV/Vis spectrophotometry. An increase in the photocatalytic activity was observed. From the photocatalytic results, the excellent activity of the Y-fullerene/$TiO_2$ composites for the degradation of methylene blue under visible irradiation could be attributed to an increase in the photo-absorption effect caused by the ZnS and to the cooperative effect of the AC.
Ze-Da Meng,Lei Zhu,Trisha Ghosh,Chong Yeon Park,Kefayat Ullah,Vikram Nikam,오원춘 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
Ag2Se-Graphene/TiO2 composite was synthesized by a facile sonochemical method. The as-prepared products were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM) and UV-vis diffuse reflectance spectrophotometer. During the reaction, both of the reduction of graphene oxide and loading of Ag2Se and TiO2 particles were achieved. The as-prepared Ag2Se-Graphene/TiO2 composites possessed great adsorptivity of dyes, extended light absorption range, and efficient charge separation properties simultaneously. Hence, in the photodegradation of rhodamine B (Rh.B), a significant enhancement in the reaction rate was observed with Ag2Se-Graphene/TiO2 composites, compared to the pure TiO2. The high activity can be attributed to the synergetic effects of high charge mobility, and red shift in absorption edge of Ag2Se-Graphene/TiO2 composites.
Lei Zhu,Ze-Da Meng,Trisha Ghosh,오원춘 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.2
To improve the visible-light induced photocatalytic application performances of TiO2, in this study, the NiS2 modied TiO2 composites were prepared by two methods: hydrothermal method and sol–gel method. The composites were denoted as hs-NiS2/TiO2, and sg-NiS2/TiO2 and characterized by XRD, UV-vis absorbance spectra, SEM, TEM, EDX, and BET analysis. The photocatalytic activities under visible light were investigated by the degradation of methyl orange (MO). The photodegradation rate of methyl orange under visible light with NiS2/TiO2 composites was markedly higher than that of pure TiO2, and the effect of hs-NiS2/TiO2 composites was better than that of sg-NiS2/TiO2. The results indicate that the hydrothermal process could partly inhibit the agglomeration of NiS2/TiO2. Thus, the dispersion of nanoparticles was improved, and that the promoting effect of NiS2 could extend the light absorption spectrum toward the visible region.
Photocatalytic Degradation of Methylene Blue by Pd/MWCNT/TiO2 under UV and Visible Light Irradiation
최종근,박종연,Lei Zhu,Ze-Da Meng,Trisha Ghosh,오원춘 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.6
Pd/MWCNT/TiO2 composites were synthesized by a sol-gel technique using multi-walled carbon nanotubes (MWCNT), palladium (II) chlorite (PdCl2) and titanium tetrachloride (TiCl4) as the carbon, palladium and titanium precursors. The Pd/MWCNT/TiO2 composites prepared were characterized by BET surface area measurements, X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The photocatalytic activity of the composites was evaluated using the degradation of methylene blue (MB) under UV and visible light irradiation as a model.
Meng, Ze-Da,Zhu, Lei,Ghosh, Trisha,Park, Chong-Yeon,Ullah, Kefayat,Nikam, Vikram,Oh, Won-Chun Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
$Ag_2Se$-Graphene/$TiO_2$ composite was synthesized by a facile sonochemical method. The as-prepared products were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM) and UV-vis diffuse reflectance spectrophotometer. During the reaction, both of the reduction of graphene oxide and loading of $Ag_2Se$ and $TiO_2$ particles were achieved. The as-prepared $Ag_2Se$-Graphene/$TiO_2$ composites possessed great adsorptivity of dyes, extended light absorption range, and efficient charge separation properties simultaneously. Hence, in the photodegradation of rhodamine B (Rh.B), a significant enhancement in the reaction rate was observed with $Ag_2Se$-Graphene/$TiO_2$ composites, compared to the pure $TiO_2$. The high activity can be attributed to the synergetic effects of high charge mobility, and red shift in absorption edge of $Ag_2Se$-Graphene/$TiO_2$ composites.
Park, Chong-Yeon,Choi, Jong-Geun,Ghosh, Trisha,Oh, Won-Chun The Korean Ceramic Society 2011 한국세라믹학회지 Vol.48 No.5
In this study, CdS combined activated carbon/$TiO_2$ (CdS-AC/$TiO_2$) composites were prepared by a sol-gel method to improve the photocatalytic performance of $TiO_2$. These composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and UV-vis analysis. The photocatalytic activities were examined by the degradation of methylene blue (MB) under visible light irradiation. The photodegradation rate of MB under visible light irradiation reached 90.1% in 120 min. The kinetics of MB degradation was plotted alongside the values calculated from the Langmuir-Hinshelwood equation. The 0.2 CAT sample showed the best photocatalytic activity, which might be due to an increase in the photo-absorption effect by activated carbon and the cooperative effect of CdS.