Effect of Ga and Gd as Catalyst in ZnO/Reduced Graphene Oxide Composites upon Photodegradation Process

2019 ◽  
Vol 287 ◽  
pp. 59-63
Author(s):  
Suntree Sangjan ◽  
Rattikan Saetan ◽  
Assareeya Aoboun
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Dye Degradation ◽  
Blue Dye ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Kinetic Mechanisms ◽  
Catalyst Type ◽  
Ft Ir

Photocatalytic degradation was improved by addition of gallium (Ga) and gadolinium (Gd) as catalysts for zinc oxide/reduced graphene oxide (ZnO/rGO) composites. Preparation, physical characterisation, dye degradation, photocatalytic activity and kinetic mechanisms of Ga-ZnO/rGO and Gd-ZnO/rGO composites were investigated. Physical characteristics of the composites were studied using Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD) and transmission electron microscopy (TEM). Photocatalytic activity of the composites was investigated by degradation of reactive blue dye solution as a function of contact time, catalyst type and catalyst concentration. Results indicated that Ga-ZnO/rGO (2 wt%Ga) and Gd-ZnO/rGO (0.6 wt%Gd) were capable of dye degradation at 62.76% and 54.43% respectively under UV irradiation for 3 h with the photocatalytic process described by pseudo first order kinetics as 0.0059 and 0.0058 min-1. Findings confirmed that addition of Ga and Gd in composite systems enhanced removal of reactive blue dye solution. Optimum conditions were recorded for Ga 2 wt% and Gd 0.6 wt% in ZnO/rGO composite. Results indicated that Ga-ZnO/rGO (2 wt%Ga) and Gd-ZnO/rGO (0.6 wt%Gd) showed promise for removal of reactive blue dye.

rGO–diaminobutane surfaces with optimized N doping and hydrodynamics as dual proton–electron conductors and carbon photocatalysts

2021 ◽  
Vol 45 (1) ◽  
pp. 383-393
Author(s):  
Mohammad Razaul Karim ◽  
Mohammed M. Rahman ◽  
Abdullah M. Asiri
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Water Splitting ◽  
Light Harvesting ◽  
Dye Degradation ◽  
Interlayer Distance ◽  
Organic Hybrid ◽  
Reduced Graphene ◽  
N Doping

A reduced graphene oxide–diaminobutane (rGO–DAB) organic hybrid revealed excellent N doping, flexible interlayer distance, and light-harvesting property to support optimized photocatalytic activity for water splitting and dye degradation.

scholarly journals Incorporation of reduced graphene oxide into faceted flower-like {001} TiO 2 for enhanced photocatalytic activity

2018 ◽  
Vol 5 (8) ◽  
pp. 180613 ◽  
Author(s):  
Haijin Liu ◽  
Peiyao Li ◽  
Haokun Bai ◽  
Cuiwei Du ◽  
Dandan Wei ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Theoretical Calculations ◽  
X Ray ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Photocatalytic Activities

Anatase TiO 2 with {001} facets is much more active than that with {101} facets, which has been verified via experiments and theoretical calculations. Graphene has garnered much attention since it was initially synthesized, due to its unique properties. In this study, reduced graphene oxide (RGO)/{001} faceted TiO 2 composites were fabricated via a solvothermal method. The composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectrophotometry, photoluminescence and Raman analysis. The results revealed that the graphene oxide was reduced during the preparation process of the {001} faceted TiO 2 , and combined with the surface of {001} TiO 2 . The photocatalytic activities of the composites were evaluated through the degradation of basic violet, under both white light ( λ > 390 nm) and visible light ( λ = 420 nm) irradiation. The results indicated that the photocatalytic activities of the {001} faceted TiO 2 were significantly improved following the incorporation of RGO, particularly under visible light irradiation. Theoretical calculations showed that the band structure of the {001} faceted TiO 2 was modified via graphene hybridization, where the separation of photoinduced electron–hole pairs was promoted; thus, the photocatalytic activity was enhanced.

scholarly journals Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with effective Photocatalytic Activity for Wastewater Treatment

2020 ◽  
Author(s):  
Muhammad Ikram ◽  
A. Raza ◽  
M. Imran ◽  
A. Ul-Hamid ◽  
S. Ali
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Electron Microscope ◽  
Reduced Graphene Oxide ◽  
Dye Degradation ◽  
Spherical Shape ◽  
Molecular Vibration ◽  
Homogeneous Distribution ◽  
Ag Nps ◽  
Reduced Graphene

Abstract Graphene oxide (GO) was obtained through modified hummers method and reduced graphene oxide (rGO) was acquired by employing heat treatment. Various concentrations (2.5, 5, 7.5 and 10 wt.%) of silver (Ag) were incorporated in GO nanosheets by adopting hydrothermal approach. Synthesized Ag decorated rGO photocatalyst Ag/rGO was characterized using X-ray diffraction (XRD) to determine phase purity and crystal structure. XRD patterns showed the formation of GO to Ag/rGO. Molecular vibration and functional groups were determined through Fourier Transform Infrared spectroscopy (FTIR). Optical properties and a decrease in bandgap with insertion of Ag were confirmed with UV-visible (Uv-vis.) spectrophotometer and Photoluminescence (PL). Electronic properties and disorders in carbon structures were investigated through Raman spectroscopy that revealed the existence of characteristic bands (D and G). Surface morphology of prepared samples was examined with Field Emission Scanning Electron Microscope (FESEM). Homogeneous distribution, size and spherical shape of Ag NPs over rGO sheets were further confirmed with the help of High-Resolution Transmission Electron Microscope (HR-TEM). Dye degradation of doped and undoped samples was examined through Uv-vis. spectra. Experimental results indicated that photocatalytic activity of Ag@rGO enhanced with increased doping ratio owing to diminished electron-hole pair recombination. Therefore, it is suggested that Ag@rGO can be used as a beneficial and superior photocatalyst to clean environment and wastewater.

MnFe2O4 decorated reduced graphene oxide heterostructures: Nanophotocatalyst for methylene blue dye degradation

Vacuum ◽  
2020 ◽  
Vol 173 ◽  
pp. 109150 ◽  
Author(s):  
Bidisha Mandal ◽  
Jnanranjan Panda ◽  
Pabitra Kumar Paul ◽  
Ratan Sarkar ◽  
Bharati Tudu
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Dye Degradation ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Oxide Heterostructures ◽  
Reduced Graphene

Synthesis of reduced graphene oxide decorated with Sn/Na doped TiO2 nanocomposite: a photocatalyst for Evans blue dye degradation

2021 ◽  
Author(s):  
K. S. Jithendra Kumara ◽  
G. Krishnamurthy ◽  
Prabhaker Walmik ◽  
Satish Naik ◽  
R. S. Priya Rani ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Evans Blue ◽  
Dye Degradation ◽  
Blue Dye ◽  
Doped Tio2 ◽  
Evans Blue Dye ◽  
Reduced Graphene

scholarly journals Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with effective Photocatalytic Activity for Wastewater Treatment

2020 ◽  
Author(s):  
Muhammad Ikram ◽  
Ali Raza ◽  
Muhammad Imran ◽  
Anwar Ul-Hamid ◽  
Atif Shahbaz ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Electron Microscope ◽  
Reduced Graphene Oxide ◽  
Dye Degradation ◽  
Spherical Shape ◽  
Molecular Vibration ◽  
Homogeneous Distribution ◽  
Ag Nps ◽  
Reduced Graphene

Abstract Graphene oxide (GO) was obtained through modified hummers method and reduced graphene oxide (rGO) was acquired by employing heat treatment. Various concentrations (2.5, 5, 7.5 and 10 wt.%) of silver (Ag) were incorporated in GO nanosheets by adopting hydrothermal approach. Synthesized Ag decorated rGO photocatalyst Ag/rGO was characterized using X-ray diffraction (XRD) to determine phase purity and crystal structure. XRD patterns showed the formation of GO to Ag/rGO. Molecular vibration and functional groups were determined through Fourier Transform Infrared spectroscopy (FTIR). Optical properties and a decrease in bandgap with insertion of Ag were confirmed with UV-visible (Uv-vis.) spectrophotometer and Photoluminescence (PL). Electronic properties and disorders in carbon structures were investigated through Raman spectroscopy that revealed the existence of characteristic bands (D and G). Surface morphology of prepared samples was examined with Field Emission Scanning Electron Microscope (FESEM). Homogeneous distribution, size and spherical shape of Ag NPs over rGO sheets were further confirmed with the help of High-Resolution Transmission Electron Microscope (HR-TEM). Dye degradation of doped and undoped samples was examined through Uv-vis. spectra. Experimental results indicated that photocatalytic activity of Ag@rGO enhanced with increased doping ratio owing to diminished electron-hole pair recombination. Therefore, it is suggested that Ag@rGO can be used as a beneficial and superior photocatalyst to clean environment and wastewater.

scholarly journals Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with effective Photocatalytic Activity for Wastewater Treatment

2020 ◽  
Author(s):  
muhammad ikram ◽  
Ali Raza ◽  
Muhammad Imran ◽  
Anwar Ul-Hamid ◽  
Atif Shahbaz ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Electron Microscope ◽  
Reduced Graphene Oxide ◽  
Dye Degradation ◽  
Spherical Shape ◽  
Molecular Vibration ◽  
Homogeneous Distribution ◽  
Ag Nps ◽  
Reduced Graphene

Abstract Graphene oxide (GO) was obtained through modified hummers method and reduced graphene oxide (rGO) was acquired by employing heat treatment. Various concentrations (2.5, 5, 7.5 and 10 wt.%) of silver (Ag) were incorporated in GO nanosheets by adopting hydrothermal approach. Synthesized Ag decorated rGO photocatalyst Ag/rGO was characterized using X-ray diffraction (XRD) to determine phase purity and crystal structure. XRD patterns showed the formation of GO to Ag/rGO. Molecular vibration and functional groups were determined through Fourier Transform Infrared spectroscopy (FTIR). Optical properties and a decrease in bandgap with insertion of Ag were confirmed with UV-visible (Uv-vis.) spectrophotometer and Photoluminescence (PL). Electronic properties and disorders in carbon structures were investigated through Raman spectroscopy that revealed the existence of characteristic bands (D and G). Surface morphology of prepared samples was examined with Field Emission Scanning Electron Microscope (FESEM). Homogeneous distribution, size and spherical shape of Ag NPs over rGO sheets were further confirmed with the help of High-Resolution Transmission Electron Microscope (HR-TEM). Dye degradation of doped and undoped samples was examined through Uv-vis. spectra. Experimental results indicated that photocatalytic activity of Ag@rGO enhanced with increased doping ratio owing to diminished electron-hole pair recombination. Therefore, it is suggested that Ag@rGO can be used as a beneficial and superior photocatalyst to clean environment and wastewater.

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