Electrodeposition for Rapid Recovery of Cobalt (II) in Industrial Wastewater Holisha Widiyanto(a*), Widya Ernayati Kosimaningrum(b), Rahmayetty(b)
a)Graduate School of Chemical Engineering, Postgraduate Program University of Sultan Ageng Tirtayasa Jl. Raya Jakarta Km.4 Pakupatan, Serang, 42122, Indonesia
Abstract
Cobalt (II) recovery from wastewater opens the opportunity for sustainability and green process. Herein, cobalt(II) was recovered from the aqueous solution by electrochemical cell method, so called electrodeposition. Cobalt electrodeposition from the solution was conducted in the electrochemical cell using a graphite anode and a stainless-steel cathode by varying current (0.25, 0.5, 0.75, 1 and 1.25 A), pH (2, 3, 4, 5, and 6),and cobalt concentration (10, 20, 30, and 50 ppm). Monitoring of all cobalt concentration changes were using ICP AES spectrophotometer. Electrodeposition at various applied current has been removed 99.81% of cobalt from the solution in 20 minutes. Prolonging electrodeposition up to 25 minutes has removed 100% cobalt in the solution. Electrodeposition was also found useful at acidic to neutral pH by removal efficiency 99.37% in 20 minutes of the process. Cobalt in various concentration solutions can be removed 99.54% by applying a current of 0.25 A for 20 minutes. The SEM image reveals the deposited cobalt on graphite anode,resulted in from 10 ppm cobalt solution,as nanocube particles.The EDX spectrum also confirmed the presence of the deposited cobalt on graphite anode.The conclusion is that the cobalt recovery process from PTA plant wastewater is feasible to be further developed.
