title: Degradation photocatalysis of tetrodotoxin as a poison by gold doped PdO nanoparticles supported on reduced graphene oxide nanocomposites and evaluation of its antibacterial activity.
abstract: In this project, synthesis of pure and gold doped PdO-reduced graphene oxide nanocomposites by sonochemical and deposition-precipitation process was performed and characterized using X-ray diffraction (XRD), transmission electronic microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The specific surface area of synthesized un-doped and Au doped PdO-RGO nanocomposites is 83.2, 109.1m2g-1and total pore volume is 0.31, 0.40cm3g-1, respectively. With Tetrodotoxin as a target pollutant, photocatalytic system of UV+photocatalyst+H2O2was set up. Some influencing parameters, including H2O2dosage and initial pH value were investigated and the stability of the photocatalyst was also studied during the photocatalysis. The optimum values of operating parameters were found at an initial pH value of 5.0, a H2O2dosage of 0.15mmol/L-1and photocatalyst dosage of 0.08g. Under the optimal conditions, the highest removal rate of Tetrodotoxin achieved 95%. Compared with the traditional photo-Fenton system, the UV+photocatalyst+H2O2system can not only improve the degradation efficiency of Tetrodotoxin, but also reduce the dosage of H2O2and thus reduce the processing cost. Antibacterial properties of un-doped and Au doped PdO-RGO nanocomposites were investigated by gram negative bacteria Escherichia coli and gram positive Staphylococcus aureus. The results showed that the antibacterial activity enhanced by Au PdO-RGO nanocomposites.
authors.affiliation: Young Researchers and Elites Club, Science and Research Branch, Islamic Azad University, Tehran, Iran. Electronic address: ali.fakhri88@yahoo.com.
authors.forename: Ali
authors.initials: A
authors.lastname: Fakhri
authors.affiliation: Department of Materials Engineering, Karaj Branch, Islamic Azad University, Karaj, Iran.
authors.forename: Mahsa
authors.initials: M
authors.lastname: Naji
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002384:Catalysis; D004926:Escherichia coli / Q000187:drug effects; D006046:Gold / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D053768:Metal Nanoparticles / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D046529:Microscopy, Electron, Transmission; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry; D010165:Palladium / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D013211:Staphylococcus aureus / Q000187:drug effects; D013779:Tetrodotoxin / Q000737:chemistry* / Q000494:pharmacology; D014961:X-Ray Diffraction
chemical_list: D000900:Anti-Bacterial Agents; D010087:Oxides; D013779:Tetrodotoxin; D010165:Palladium; D006046:Gold; D006108:Graphite; C048320:palladium oxide; D006861:Hydrogen Peroxide
keywords: Antibacterial activity; Gold doped; PdO; Photocatalytic; Sonochemical method; Tetrodotoxin