The Decomposition of Cyanide by the Electrodeposited Lead Dioxide Electrode

전착이산화납전극에 의한 시안염 분해

  • 한만석 (인하대학교 화학공학과) ;
  • 탁용석 (인하대학교 화학공학과) ;
  • 이충영 (인하공업전문대학 공업화학과) ;
  • 남종우 (인하대학교 화학공학과)
  • Received : 1997.01.17
  • Accepted : 1997.04.28
  • Published : 1997.06.10


${\beta}-PbO_2$ electrode, which was electrodeposited on Ti madras, was prepared and for the decomposition of cyanide in electroplating wastewater. After the investigation of temperature and pH conditions for no hydrogen cyanide evolution during the decomposition of cyanide, the optimum current densities of ${\beta}-PbO_2$ electrodeposition and cyanide decomposition were determined in 500ppm NaCN solution, and durability of ${\beta}-PbO_2$ electrode was also investigated. Hydrogen cyanide was actively generated above $40^{\circ}C$ and was not evolved above pH 13. ${\beta}-PbO_2$ electrode electodeposited at $5A/dm^2$ showed the best cyanide decomposition efficiency The decompostion efficiency was about 70% at low decomposition current density ($0.08A/dm^2$), and it decreased gradually to about 10% as the decomposition current density increased up to $4A/dm^2$. The film of ${\beta}-PbO_2$ electrodeposited was corrosive at $20A/dm^2$ and was broken at $50A/dm^2$.