The Electrochemical Property of Acetylene Black Suspension Solution with Ozone Bubbling and Its Effects on Coppeer Dissolution

The electrochemical properties of acetylene black suspension solutions containing sulfuric and hydrochloric acid were investigated both with and without ozone bubbling. It was found that the potential of the acetylene black suspension solution on Pt electrode increased with ozone bubbling. In 2.5 kg/m3 acetylene black suspension solutions with 0.5 kmol/m 3 H2SO4 or 1 kmol/m3 HCl, the potential was maintained at more than 1.1 V (vs normal hydrogen electrode) for over 1 hour after the ozone bubbling was stopped. In contrast, the solution potentials on Pt electrode reduced to the original value that is less than 0.8 V in 0.5 kmol/m3 H2SO4 or 1 kmol/m3 HCl solution without acetylene black particles, in a short period of time. This phenomenon may result from the formation of extra surface functional groups on the acetylene black particles, which have been oxidized by the ozone. The potential of the acetylene black suspension solution with 0.5 kmol/m3 H2SO4 on Pt electrode was found to decrease with increasing temperature and pH, regardless of the amount of acetylene black. The behaviors of copper dissolution in the acetylene black suspension solution containing 0.5 kmol/m3 H2SO4 with ozone bubbling have also been investigated. It was found that copper dissolves much faster in the solution with acetylene black particles than without them. In addition to this, the rate of copper dissolution was found to increase with the concentration of acetylene black and the temperature below 60°C, but decreased with an increase in pH. The copper dissolution in the suspension solution with ozone bubbling appears to proceed under chemical reaction control for these conditions.