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.

Dye degradation performance, bactericidal behavior and molecular docking analysis of Cu-doped TiO2 nanoparticles

“…59 Drop in band gap energy with an increase in Cu concentration is attributed to Cu 2+ ions that intercalated between host lattices of TiO 2 and generated oxygen vacancies due to charge compensation effect. In addition, band 73 Anatase 99% 180 min Sol-gel 5 Anatase 98% 120 min Hydrothermal 47 Anatase 90% 180 min Microwave-assisted sol-gel 11 Anatase 90% 350 min Solvothermal 74 Anatase 70% 120 min Sol-gel 55 Anatase 99% 200 min Sol-gel 66 Anatase 90% 180 min…”

“…Cu-doped TiO 2 showed signicant results when compared with the data reported in the literature and included in Table 2. 72,73 Based on these ndings, Cu-doped TiO 2 can be considered to possess an excellent potential for use toward treatment of polluted water.…”

Development of Multi-Concentration Ag:Cu Bimetallic Nanoparticles as a Promising Bactericidal for Antibiotic-Resistant Bacteria as Per Molecular Docking Exploration

“…K shows absorption index, and E g is equal to band gap energy in eV. The value of "n" is related to electronic transition type of band gap [13,26,68,69]. The band gap of prepared bimetallic products was calculated and found to be 3.2, 2.9, 2.7, and 2.6 eV, as demonstrated in Fig.…”

Adsorption of T.N.T. from Wastewater Using Ni-Oxide and Cu-Oxide Nanoparticles

“…has been listed as a significant pollutant to public health and aquatic life by the USEPA 7 . Different methods, such as catalysis, photocatalysis, and adsorption have been used to eliminate contamination from wastewater [8][9][10][11][12][13][14][15][16] .…”