SILVER RECOVERY FROM WASTE PRINTED CIRCUIT BOARDS (PCB) USING DEEP EUTECTIC SOLUTION GLYCELINE Soja Siti Fatimah, Arbiansyah Aldhafi, Abraham Mora
Departement of Chemistry Education, Faculty of Mathematics and Natural Sciences Education
Abstract
Silver metal has the best thermal and electrical conductor properties among all metals, so it can be used in electrical applications. The use of silver in a wider field, it is necessary to look for it as a secondary source. One of the industrial wastes containing silver metal is printed circuit boards (PCBs). This research was carried out beginning from the synthesis of glyceline DES with the row materials of choline and glycerol, which was then used for leaching silver from PCB waste as an environmentally friendly leachate. The resulting glycerin DES was characterized physically and chemically. DES glycerin is a colorless, viscous liquid, and has a density of 1.1379 g/mL at 250C. The DES characterization of glycerin with the FTIR instrument showed an increase in the peak area of the -OH functional group. The results of silver leaching from PCBs waste were analyzed using XRF resulting recovery at 74.32% obtained at a leaching temperature of 1200C, 3x8 hours, at 1000 rpm. The leached filtrate was carried out by electrodeposition of silver using the cyclic voltammetry method with Au, Ag/AgCl, and Pt as the working electrode, reference electrode, and counter electrode, respectively.
