Photo catalytic applications of gold nanoparticles synthesized by green route and electrochemical degradation of phenolic Azo dyes using AuNPs/GC as modified paste electrode

摘要

AbstractA highly efficient, quick and environmentally benign protocol has been adopted to synthesize AuNPs using the plant extract ofSueda fruciotosa. UV–vis spectroscopy, XRD, HRTEM, SEM and FTIR were used to characterize the prepared AuNPs. Different concentrations of plant extract were used to optimize the size, morphology and distribution of AuNPs. AuNPs were of small size and spheroid in shape at lower concentration. AuNPs showed a surface plasmon resonance at 443?nm. According to HRTEM the average size of AuNPs was 6–8?nm. The AuNPs were appraised for their photo degradation activity on methylene blue (MB) as an experimental substrate. Photo-catalytic activity of AuNPs was found to be dependent on the concentration of catalyst, irradiation time, size and aggregation of AuNPs. Furthermore, AuNPs exhibited an excellent electro-catalytic activity. The sensitivity of modified AuNPs was also studied for phenolic Azo dyes (PAD) which showed its good degradation activity. These gold nanoparticles found to be significantly applicable in the field of electrochemistry, sensors, catalysis, nano-devices, treatment of waste water and conversion of toxic agents into less toxic compound.Highlights?Synthesis and characterization of gold nanoparticles by green method.?S.?fruciotosaplant extract are used as stabilizer and reducing agent.?Photocatalytic activity and photo degradation of methylene blue.?Electrocatalytic activity and cyclic voltammetric analysis of catechol.?Electrochemical degradation of Phenolic Azo Dyes using modified AuNPs paste electrode.]]>