EVALUATION OF THE FUNCTIONALIZATION OF GOLD NANOPARTICLES PREPARED BY LASER ABLATION FOR THE DETECTION OF HEAVY METALS IN POLLUTED WATER SAMPLES

The research was carried out with the purpose of functionalizing AuNPs gold nanoparticles prepared by laser ablation for the detection of heavy metals in contaminated water samples in the province of Tayacaja Huancavelica. The solid state pulsed Nd: YAG laser was used to produce gold nanoparticles by the laser ablation technique, using as a target a 24 carat gold plate with dimensions 1 cm x 1 cm with a thickness of 1mm, immersed in 20 ml of ultrapure water contained in quartz cuvettes. The nanoparticles were characterized by UV-Vis spectrophotometry. The target was ablated with infrared radiation of wavelength at 1064 nm from the laser equipment, with energy of 60.28 mJ/p and 32.99 mJ/p at a frequency of 10 Hz, for 60 minutes. AuNPs were obtained in colloidal state, whose diameters were 25 nm calculated with the spectrophotometer, ob-serving an absorption peak centered at 518.12 nm characteristic of spherical gold nanoparticles. It is concluded that AuNPs in colloidal state allow the detection of heavy metals the concentrations of lead, cadmium and arsenic contained in water, by changing the color of the AuNPs colloid proportional to the concentration of each heavy metal detected. It is concluded that AuNPs in colloidal state allow the detection of heavy metals the concentrations of lead, cadmium and arsenic contained in water, by changing the color of the AuNPs colloid proportional to the concentration of each heavy metal detected. It is concluded that AuNPs in colloidal state allow the detection of heavy metals Cd2+, Pb2+, and As+2 in water.