Review elucidating graphene derivatives (GO/rGO) supported metal sulfides based hybrid nanocomposites for efficient photocatalytic dye degradation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mahwash Mahar Gul ◽  
Khuram Shahzad Ahmad
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Hybrid Composites ◽  
Dye Degradation ◽  
Metal Sulfide ◽  
Pollutant Removal ◽  
Metal Sulfides ◽  
Degradation Rates ◽  
Graphene Derivatives ◽  
Photocatalytic Dye Degradation

Abstract Photocatalysis by utilizing semiconductors for the removal of toxic pollutants has gained tremendous interest for remediation purposes. The organic pollutants usually include; pesticides, dyes and other phenolic compounds. An imperative restraint associated with the photocatalytic effectiveness of the catalyst is the rapid recombination of the light generated electrons and holes. The particle agglomeration and electron-hole recombination hinders the rate of pollutant removal. For decades, researchers have used metal-sulfides efficiently for photocatalytic dye degradation. The recent use of hybrid nanomaterials with the combination of graphene derivatives such as graphene oxide and reduced graphene oxide (GO/rGO)-metal sulfide has gained interest. These composites have displayed an impressive upsurge in the photocatalytic activity of materials. The current review describes the various researches on dye photodegradation by employing (GO/rGO)-metal sulfide, exhibiting a boosted potential for photocatalytic dye degradation. A comprehensive study on (CuS, ZnS and CdS)–GO/rGO hybrid composites have been discussed in detail for effective photocatalytic dye degradation in this review. Astonishingly improved dye degradation rates were observed in all these studies employing such hybrid composites. The several studies described in the review highlighted the varying degradation rates based on diverse research parameters and efficacy of graphene derivatives for enhancement of photocatalytic activity.

scholarly journals Vanadium doped CaTiO3 cuboids: Role of vanadium in improving the photocatalytic activity

2021 ◽  
Author(s):  
Harsha Bantawal ◽  
Sandhya U. Shenoy ◽  
Denthaje Krishna Bhat
Keyword(s):  
Photocatalytic Activity ◽  
Water Splitting ◽  
Dye Degradation ◽  
Low Cost ◽  
Physicochemical Stability ◽  
Photocatalytic Dye Degradation

CaTiO3 has attracted enormous interest in the field of photocatalytic dye degradation and water splitting owing to its low cost, excellent physicochemical stability and structural tunability. Herein, we have developed...

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.

Effects of morphology, surface area, and defect content on the photocatalytic dye degradation performance of ZnO nanostructures

RSC Advances ◽  
2014 ◽  
Vol 4 (77) ◽  
pp. 41099-41110 ◽  
Author(s):  
Natalia Morales Flores ◽  
Umapada Pal ◽  
Reina Galeazzi ◽  
Alberto Sandoval
Keyword(s):  
Photocatalytic Activity ◽  
Surface Area ◽  
Dye Degradation ◽  
Zno Nanostructures ◽  
Defect Content ◽  
Photocatalytic Dye Degradation

Contributions of morphology, surface area, and defect content, on the photocatalytic activity of ZnO nanostructures have been discussed.

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.

ZnO Tetrapods for Potential Photocatalytic Dye Degradation

2018 ◽  
Vol 779 ◽  
pp. 97-101 ◽  
Author(s):  
Shynggys Sadyk ◽  
Timur Sh. Atabaev
Keyword(s):  
Photocatalytic Activity ◽  
Electron Microscope ◽  
Dye Degradation ◽  
Uv Light ◽  
Photocatalytic Properties ◽  
Light Illumination ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Photocatalytic Dye Degradation ◽  
Scanning Electron

In this study, a facile method was used to prepare ZnO tetrapods for potential dye degradation applications. Field emission scanning electron microscope (FESEM), energy-dispersive X-ray spectroscopy (EDX) and UV-Vis spectroscopy were employed to investigate the morphology, chemical composition, and photocatalytic properties of prepared ZnO tetrapods. A Rhodamine B (RB) dye was used as a model dye to study the photocatalytic activity of the prepared sample. It was shown that RB dye can be efficiently degraded in the presence of ZnO tetrapods under continuous UV-light illumination. Thus, prepared ZnO tetrapods with excellent photocatalytic properties can be potentially used in wastewater treatment.

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.

Sign in / Sign up

Export Citation Format

Share Document