SILVER RECYCLING FROM PHOTO-PROCESSING WASTE USING ELECTRODEPOSITION METHOD

Mochammad Feri Hadiyanto (Chemistry Department, Faculty of Mathematics and Natural Sciences Gadjah Mada University, Yogyakarta)
Agus Kuncaka (Chemistry Department, Faculty of Mathematics and Natural Sciences Gadjah Mada University, Yogyakarta)

Indonesian Journal of Chemistry
Vol 2, No 2 (2002)

            Silver electrodeposition of photo-processing waste and without addition of KCN 1,0 M has been studied for silver recycling. Photo procesing waste containing silver in form of [Ag(S2O3)2]3- was electrolysed at constant potential and faradic efficiency was determined at various of electrolysis times. Electrolysis of 100 mL photo processing waste without addition of KCN 1,0 M was carried out at constant potential 1.20 Volt, while electrolysis 100 mL photo procesing waste with addition of 10 mL KCN 1,0 M electrolysis was done at 1.30 Volt.The results showed that for silver electrodeposition from photo processing waste with addition of KCN 1,0 M was more favorable with faradic efficiency respectively were 93,16; 87,02; 74,74 and 78,35% for 30; 60; 90 and 120 minutes of electrolysis.