ELECTROCHEMICAL SYNTHESIS OF NICKEL HYDROXIDE Ni(OH)2 NANOPARTICLES SOLUTION FOR DETECTING MERCURY (Hg)

Abstract

Nickel hydroxide Ni(OH) 2 nanoparticles were used as sensors for mercury (Hg) in water using a UV-Vis spectrophotometer instrument. The synthesis of Ni(OH) 2 nanoparticles was carried out by electrochemical method using nickel plates as anode and cathode and the process was operated at constant voltage of 25 V for 30 minutes. In this study, 2 variations of the concentration of Ni(OH) 2 nanoparticles were used, namely (5 mL and 4 mL) to detect mercury at concentrations of 0 ppm, 10 ppm, 20 ppm, 30 ppm, 40 ppm, and 50 ppm. Changes in the absorbance value of Ni(OH) 2 nanoparticles will be observed. From the observations, there was a decrease in the absorbance value of Ni(OH) 2 nanoparticles along with the increase in mercury concentration. The decrease in the absorbance value of Ni(OH) 2 nanoparticles is directly proportional to the amount of mercury concentration. The detection limit value was obtained at a volume of 5 mL and 4 mL are 42 ppm, and 75.8 ppm.