新型气体扩散电极体系高效产H_2O_2的研究

Novel Gas Diffusion Electrode System for Effective Production of Hydrogen Peroxide

以自制新型石墨/聚四氟乙烯(PTFE)气体扩散电极在无隔膜体系中进行双氧水发生工艺的优化研究,主要探讨了不同石墨和PTFE质量比、阴极电位、pH值和氧气流速对H2O2产率的影响.结果表明,以石墨和PTFE质量比为2∶1的气体扩散电极为阴极,在pH=3,Na2SO4浓度为0.1mol·L-1,氧气流速为0.4L·min-1,阴极电位为-0.55V(vsSCE)时,2h后H2O2可以达到60mg·L-1.该新型体系有较高的H2O2产率和电流效率(可达60%以上),且pH值适用范围较广,可望应用于水中污染物的处理.

Hydrogen peroxide production via cathodic reduction of oxygen on self-made gas diffusion electrode was studied in an undivided system. The effects of mass ratio between graphite and PTFE, cathodic potential, pH, and gas flow rate on hydrogen peroxide output were investigated. When the mass ratio between graphite and PTFE was 2：1, pH=3, Na2SO4 concentration was 0.1 mol·L-1, oxygen flow rate was 0.4 L·min-1, and cathodic potential was -0.55 V （vs SCE）, hydrogen peroxide concentration could reach about 60 mg·L-1 after 2 h. It had a good hydrogen peroxide output and current efficiency. The pH values applicable to hydrogen peroxide production could be extended to a wide range in this undivided system and this novel gas diffusion electrode system is expected to be applicable in waste water treatment.