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.

Microwave assisted synthesis of CuS-reduced graphene oxide nanocomposite with efficient photocatalytic activity towards azo dye degradation

2016 ◽  
Vol 4 (4) ◽  
pp. 4600-4611 ◽  
Author(s):  
Priyakshree Borthakur ◽  
Purna K. Boruah ◽  
Gitashree Darabdhara ◽  
Pinaki Sengupta ◽  
Manash R. Das ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Azo Dye ◽  
Dye Degradation ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
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 ◽  
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.

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.

Facile fabrication of reduced graphene oxide/CuI/PANI nanocomposites with enhanced visible-light photocatalytic activity

RSC Advances ◽  
2016 ◽  
Vol 6 (50) ◽  
pp. 44851-44858 ◽  
Author(s):  
Xiufang Wang ◽  
Jun Zhang ◽  
Kehua Zhang ◽  
Wensheng Zou ◽  
Shaohua Chen
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Water Splitting ◽  
Visible Light Photocatalytic Activity ◽  
Degradation Of Dyes ◽  
Reduced Graphene ◽  
Facile Fabrication ◽  
Visible Light Photocatalytic

Novel rGO/CuI/polyaniline nanocomposites with enhanced photocatalytic activity for the degradation of dyes and water splitting H2 production have been synthesized.

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.

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.

Reduced graphene oxide/potassium niobate composite nanoscrolls with enhanced photocatalytic activity for dye degradation

2013 ◽  
Vol 108 ◽  
pp. 139-142 ◽  
Author(s):  
Xiangqing Li ◽  
Taiyang Zhang ◽  
Siwen Gu ◽  
Shi-Zhao Kang ◽  
Guodong Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Dye Degradation ◽  
Potassium Niobate ◽  
Reduced Graphene

Indium-substituted ZnO/reduced graphene oxide nanocomposites: Solvothermal synthesis and enhanced visible-light-driven photocatalytic activity

2014 ◽  
Vol 07 (02) ◽  
pp. 1450013 ◽  
Author(s):  
Jie Zhu ◽  
Wanhong He ◽  
Lu Zhang ◽  
Xu Xiang ◽  
Zhiwei Li
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Dye Degradation ◽  
Shielding Effect ◽  
Bandgap Engineering ◽  
Composite Photocatalyst ◽  
Reduced Graphene ◽  
Visible Light Driven

A new protocol was developed to obtain a composite photocatalyst by incorporating indium to ZnO and subsequently assembling it with reduced graphene oxide (RGO) sheets. The incorporation of indium led to lattice distortion of ZnO and introduction of defect levels. The hybridization with RGO could improve the electron transport and extend the lifetime of photo-generated carriers, leading to enhanced activity for dye degradation driven by visible light. The photocatalytic activity appeared to be dependent on the relative quantity of RGO. The optimized quantity resulted in the highest activity due to the dual role of electron shuttle and "shielding effect" of RGO. In addition, the composite photocatalyst exhibited excellent repeatable use performance, suggestive of its high stability. This study proposed a promising strategy to construct photocatalysts by rational bandgap engineering and tunable composite technology.

scholarly journals Reduced graphene oxide-supported Ag-loaded Fe-doped TiO2 for the degradation mechanism of methylene blue and its electrochemical properties

RSC Advances ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 6488-6501 ◽  
Author(s):  
Dhayanantha Prabu Jaihindh ◽  
Ching-Cheng Chen ◽  
Yen-Pei Fu
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Electrochemical Properties ◽  
Reduced Graphene Oxide ◽  
Water Splitting ◽  
Dye Degradation ◽  
Degradation Mechanism ◽  
Doped Tio2 ◽  
Reduced Graphene

Graphene oxide-based composites have been developed as cheap and effective photocatalysts for dye degradation and water splitting applications.

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