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

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

10.21203/rs.2.23414/v2 ◽

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

New Journal of Chemistry ◽

10.1039/d0nj05062h ◽

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.

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

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2016.10.023 ◽

2016 ◽

Vol 4 (4) ◽

pp. 4600-4611 ◽

Cited By ~ 26

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

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Visible light driven reduced graphene oxide supported ZnMgAl LTH/ZnO/g-C3N4 nanohybrid photocatalyst with notable two-dimension formation for enhanced photocatalytic activity towards organic dye degradation

Environmental Research ◽

10.1016/j.envres.2021.111079 ◽

2021 ◽

Vol 197 ◽

pp. 111079

Author(s):

K. Bhuvaneswari ◽

G. Palanisamy ◽

G. Bharathi ◽

T. Pazhanivel ◽

Indra Raj Upadhyaya ◽

...

Keyword(s):

Photocatalytic Activity ◽

Graphene Oxide ◽

Visible Light ◽

Reduced Graphene Oxide ◽

Dye Degradation ◽

Organic Dye ◽

Two Dimension ◽

Reduced Graphene ◽

Visible Light Driven ◽

Organic Dye Degradation

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

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.287.59 ◽

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.

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

Separation and Purification Technology ◽

10.1016/j.seppur.2013.02.018 ◽

2013 ◽

Vol 108 ◽

pp. 139-142 ◽

Cited By ~ 16

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

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

Functional Materials Letters ◽

10.1142/s1793604714500131 ◽

2014 ◽

Vol 07 (02) ◽

pp. 1450013 ◽

Cited By ~ 1

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.

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