Ze-Da Meng

Hanseo University, Kōjō, South Chungcheong, South Korea

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Publications (60)58.18 Total impact

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    ABSTRACT: The authors report novel material PbSe/graphene nanocomposite synthesis via facile ultrasonic assisted method. The structural and physicochemical properties of PbSe/graphene composite are further characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with an energy-dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), and Raman spectroscopy analysis. The photocatalytic activities were investigated by the degradation of methylene blue and rhodamine B as a standard dye. This study suggests that the as-prepared PbSe/graphene nanocomposite can be utilized as an efficient photocatalyst material.
    Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry 04/2015; 45(4). · 0.50 Impact Factor
  • Journal of Industrial and Engineering Chemistry 07/2014; · 2.15 Impact Factor
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    ABSTRACT: In the present work, and were prepared by the chemical deposition method. Structural variations, surface state and elemental compositions were investigated for preparation of sonocatalyst. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and transmission electron microscopy (TEM) were employed for characterization of these new photocatalysts. A rhodamine B (Rh.B) solution under ultrasonic irradiation was used to determine the catalytic activity. Excellent catalytic degradation of an Rh.B solution was observed using the composites under ultrasonic irradiation. Sonocatalytic degradation is a novel technology of treating wastewater. During the ultrasonic treatment of aqueous solutions sonoluminescence, cavitaties and "hot spot" occurred, leading to the dissociation of water molecules. In case of a coupled system, a semiconductor coupled with two components has a beneficial role in improving charge separation and enhancing response to ultrasonic radiations. In case of the addition of as new matter, the excited electrons from the particles are quickly transferred to particle, as the conduction band of is 0.74 eV which is -0.5 eV more than that of . This transfer of charge should enhance the oxidation of the adsorbed organic substrate. The result shows that the photocatalytic performance of nanoparticles was improved by loading .
    Korean Journal of Materials Research 03/2014; 24(1):6-12.
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    ABSTRACT: In this study, we report a novel PtSe2/graphene nanocomposite by facile ultrasonic-assisted techniques. The “as-prepared” nanocomposites were further characterized by various techniques such as X-ray diffraction, scanning electron microscopy with an energy dispersive X-ray analysis, transmission electron microscopy, UV–Vis absorbance spectra analysis, diffuse reflectance analysis, and Raman spectroscopic analysis. The photocatalytic activities of the composites were investigated by the degradation of rhudamine B and methylene blue as a standard dyes. The photodegradation rates of organic dyes by the nanocomposites are found to be markedly high. This study suggests that the as-prepared PtSe2/graphene composite can be utilized as highly efficient photocatalyst materials that employed visible light as an energy source.
    Journal of Materials Science 02/2014; · 2.31 Impact Factor
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    ABSTRACT: Here we report improved photo-catalytic effect of under visible light using carbon nano-tubes (CNT) modified with nanoparticles. The optical properties, structural properties and compositional analysis, as well as the photo-electrochemical properties of the prepared composites were investigated. It was found that the photocurrent density, and the photo-catalytic effect, was increased by modification of CNT in this way. Compared with the separate effects of and CNT nanoparticles, the photocatalytic effect of CNT-modified-with- composites, increased significantly due to a synergistic effect between the CNT and the nanoparticles.
    Journal of the Korean Ceramic Society 01/2014; 51(1).
  • Asian Journal of Chemistry 12/2013; 26(1):145-150. · 0.25 Impact Factor
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    ABSTRACT: We report fast and facile synthesis of Pt/graphene nanocomposite via microwave assisted techniques. The “as-prepared” composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with an energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), UV–vis absorbance spectra analysis, diffuse reflectance spectra (DRS) analysis and Raman spectroscopic analysis. The visible light photo catalytic activities of Pt/graphene nanocomposite were tested by rhodamine B (Rh.B) and methylene blue (MB) as a standard model dyes. These analysis provide a promising development toward graphene based high efficient photocatalyst under visible light as an energy source.
    Materials Science and Engineering B 11/2013; · 1.85 Impact Factor
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    ABSTRACT: We report a simple and effective route to synthesize graphene based platinium selenide nanocomposites by facile and fast microwave assisted techniques. The “as-prepared” composites are further characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), Raman spectroscopic analysis, UV–vis absorbance spectra analysis and UV–vis diffuse reflectance spectra (DRS). The photocatalytic activities were investigated by the degradation of methylene blue and rhudamine B as standard dye. This result gives a promising development towards graphene based efficient photocatalyst that employed visible light as an energy source.
    Materials Science in Semiconductor Processing 10/2013; · 1.34 Impact Factor
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    ABSTRACT: In the present work, CoS2 and CoS2-CNT were irradiated by visible light respectively. The generation of reactive oxygen species were detected through the oxidation reaction from 1,5-diphenyl carbazide (DPCI) to 1,5-diphenyl carbazone (DPCO). The composite obtained was also characterized by transmission electron microscopy (TEM), Raman and UV-vis analysis. From the photocatalytic results, the excellent activity of the CoS2-CNT composites for degradation of methylene blue under visible irradiation could be attributed to both the effects of charge transfer to carbon nanomaterial, and the introduced CoS2 to enhance the photogenerated electrons transfer.
    Applied Surface Science 09/2013; · 2.54 Impact Factor
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    ABSTRACT: Reactive oxygen species (ROS) can be produced by interactions between sunlight and light-absorbing substance in natural water environment and can completely destroy various organic pollutants in wastewaters. In this study, CoS2 and CoS2-fullerene were irradiated by visible light respectively. The generation of reactive oxygen species were detected through the oxidation reaction from 1,5-diphenyl carbazide (DPCI) to 1,5-diphenyl carbazone (DPCO). In comparison with the separate effects of CoS2 and fullerene nanoparticles, the photochemically effect of the fullerene photosensitized CoS2 composites is increased significantly due to the synergetic effect between the fullerene and the CoS2 nanoparticles.
    Materials Research Bulletin 08/2013; · 1.97 Impact Factor
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    ABSTRACT: Tin selenide (SnSe) particles and SnSe-graphene composites were fabricated using a facile hydrothermal method. SnSe acted as a photocatalytic semiconductor material attached with graphene inducing excellent photocatalytic activity. The characterizations of composites were studied by X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscope (TEM), and with Energy dispersive X-ray (EDX). Moreover the Raman spectroscopic analysis was also observed of the SnSe-graphene composites with graphene oxide (GO) which has been previously established. The photocatalytic activity of SnSe-graphene was evaluated by measuring the photocatalytic degradation of organic pollutants such as methylene blue (MB), industrial dyes such as Texbrite BA-L (TBA) and Texbrite MST-L (TMST) under visible light. The photocatalytic degradation was analyzed using UV/Vis Spectrophotometer. The kinetic studies were also conducted to determine the order and the rate of the photocatalytic degradation of the organic dyes.
    Fresenius Environmental Bulletin 08/2013; · 0.64 Impact Factor
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    ABSTRACT: This paper introduces a two-step method for the synthesis of hybrid NiS2/TiO2-graphene nano-composites, which exhibited superior properties like photoactivity over single material. The as-prepared composites were characterized by XRD, UV-VIS absorbance spectra, SEM, TEM, EDX, and BET analysis, revealing the uniform covering of the graphene nanosheet with NiS2 and TiO2 nanocrystals. Hence, in the photodegradation of methylene blue, a significant enhancement in the reaction rate was observed with NiS2/TiO2-graphene composites, compared to the pure TiO2 and NiS2-TiO2. The high activity can be attributed to the synergetic effects of high charge mobility, and red shift in absorption edge of NiS2/TiO2-graphene.
    Fresenius Environmental Bulletin 08/2013; 22(4b). · 0.64 Impact Factor
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    ABSTRACT: In the present work, CoS2, CoS2-CNT, and CoS2-CNT/TiO2 were irradiated by visible light respectively. The generation of reactive oxygen species were detected through the oxidation reaction from 1,5-diphenyl carbazide (DPCI) to 1,5-diphenyl carbazone (DPCO). The composite obtained was also characterized by transmission electron microscopy (TEM) and UV-vis analysis. From the photocatalytic results, the excellent activity of the CoS2-CNT/TiO2 composites for degradation of methylene blue under visible irradiation could be attributed to both the effects between photocatalysis of the supported TiO2 and charge transfer of the carbon nanomaterial, and the introduction of CoS2 to enhance the photogenerated electrons transfer.
    Fresenius Environmental Bulletin 08/2013; · 0.64 Impact Factor
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    ABSTRACT: ACF and ZnO modified TiO2 composite materials (ZnO-ACF/TiO2) were prepared by a sol-gel method. The composites were characterized by 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 the MO was determined using UV spectrophotometers. An increase in the photocatalytic activity was observed and attributed to an increase of the photo-absorption effect by the ZnO and the cooperative effect of the ACF.
    Journal of the Korean Ceramic Society 07/2013; 50(4):269-274.
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    ABSTRACT: In this study, novel material Pt–graphene/TiO2 nanocomposites were prepared by facile and fast microwave assisted method. The ‘‘as-prepared’’ composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with an energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM) and UV–Visible absorbance spectra analysis. UV–Visible diffuse spectra (DRS) were obtained by using a scan UV–Visible spectrophotometer equipped with an integrating sphere assembly. The photocatalytic activities were investigated by the degradation of rhodamine B (Rh.B) as a standard dye. The photodegradation rate of Rh.B under UV/Visible light was found markedly high with increasing wt% of graphene in Pt–graphene/TiO2 nanocomposites. This revealed that the excellent photoinduced charge separation abilities and observed red shift in these hybrid semiconductors, transport properties of graphene make these hybrid materials as potential candidates for developing high-performance and next-generation photocatalyst materials.
    Chemical Engineering Journal 07/2013; 231:76-83. · 3.47 Impact Factor
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    ABSTRACT: Multiwalled carbon nanotubes (MWCNTs) modified with Pd and TiO2 composite catalysts were synthesized by the sol-gel method followed by solvothermal treatment at low temperature. The chemical composition and surface structure were characterized by X-ray diffraction (XRD), energy-dispersive X-ray (EDX) spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Photocatalytic recycle degradation experiments were carried out under both UV and visible light irradiation in the presence of MWCNT/TiO2 and Pd-MWCNT/TiO2 composites. As expected, the nanosized Pd-MWCNT/TiO2 photocatalysts had enhanced activity over the non Pd treated MWCNT/TiO2 material in the degradation of a rhodamine B (Rh.B) solution. An increase in photocatalytic activity was observed and attributed to an increase in the photo-absorption effect by MWCNTs and the cooperative effect of Pd and TiO2 nanoparticles. According to the recycled results, the as-prepared Pd-MWCNT/ TiO2 sample had a good effect on it.
    Journal of the Korean Ceramic Society 07/2013; 50(4):251-256.
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    ABSTRACT: This study was focused on the intriguing photocatalytic activity of CdSe-graphene composites synthesized by facile hydrothermal method, in which the composites successfully degraded highly complex commercial industrial dyes by the process of photocatalysis. Industrial dye such as Texbrite BBU- L (TBBU, liquid) and Texbrite BAC-L (TBAC, liquid) were used as sample compounds. A small reactor arrangement was organized to carry out the photocatalytic degradation of TBBU and TBAC using UV lamp (8W, VL-4.LC). The aqueous dilutions of the two industrial dyes were done forming 0.0003% V/V solution of TBBU and 0.00025% V/V solution of TBAC, owing to the slightly higher colour intensity of TBAC. The absorbance graph obtained from UV-Vis spectroscopic analysis showed the gradual decrease in the absorbance of the dyes with increasing time after the addition of the CdSe-graphene composites. The photocatalytic degradation were calculated based on the decreasing concentration as a function of increasing time obtained after the initial adsorption/desorption equilibrium. Results demonstrated CdSe-graphene composites effectively degrade TBBU and TBAC under optimum conditions.
    Carbon 2013, Rio Dei Jenairo, Brazil; 07/2013
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    ABSTRACT: In this study novel material PbS–graphene/TiO2 composites were prepared by sol–gel method. The ‘‘as- prepared’’ composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with an energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), UV–vis diffuse reflectance spectra (DRS) and Raman spectroscopic analysis. The photocatalytic activities were investigated by the degradation of methylene blue (MB) as a standard dye. We observed that coupling of PbS with TiO2 extends the photoresponse to visible region. This revealed that the excellent photoinduced charge separation abilities and transport properties of graphene make these hybrids as potential candidates for developing high-performance next-generation devices.
    Journal of Industrial and Engineering Chemistry 07/2013; · 2.15 Impact Factor
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    ABSTRACT: In this study, series of electrodes were prepared. The decrease of surface area compared with that of the pristine activated carbon indicated the blocking of micropores on the surface of the activated carbons; was further supported by scanning electron microscopy. The X-ray diffraction results showed that the composites contained a mixture of anatase forms of TiO2 particles when the precursor was TiO2 powder, whereas when the precursor was TOS, the composites contained only the typical single and clear anatase TiO2 particles. The energy dispersive X-ray spectroscopy showed the presence of C, O and Ti peaks for all samples. It was found that catalytic decomposition of methylene blue solution could be attributed to synthetic effects between the TiO2 photocatalysis and electro-assisted ACs network and that photoelectrocatalytic oxidation increased with added of Co and graphene composition.
    Asian Journal of Chemistry 01/2013; 25(10):5415-5419. · 0.25 Impact Factor
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    ABSTRACT: Surface plasmon resonance induced synthesis of Ag/graphene composites from Ag/graphene oxide (Ag/GO) in a two-phase (water–toluene) solvent was reported. Transmission electron microscopy (TEM) results revealed that the Ag nanoparticles with size of 5–8 nm were trimly distributed on reduced graphene oxide sheets. Raman and X-ray photoelectron spectroscopy (XPS) have demonstrated low defect density and high deoxygenation degree of graphene in Ag/graphene composite. The excellent structure and morphology of Ag/graphene composites contributed to superior electrical properties for reduction of H2O2.
    Applied Surface Science 01/2013; 265:578–584. · 2.54 Impact Factor