NGHIÊN CỨU SỰ HÌNH THÀNH VÀ PHÂN HỦY PEROXYMONOCARBONATE (HCO4 - ) TRONG DUNG DỊCH

Tóm tắt

In this work, the formation and decomposition of a strongly oxidative peroxymonocarbonate ion (HCO4 –) prepared in-situ from the reaction between bicarbonate and hydrogen peroxide was studied. To determine the HCO4 – concentration in presence of residual hydrogen peroxide, a procedure of iodometric titration was set up at low temperature (below -10 oC) at which the effect of residual H2O2 was negligible. The effects of HCO3 –: H2O2 molar ratio and pH on the obtained HCO4– concentration as well as the kinetic model of the HCO4– formation/decomposition were investigated. The results revealed that the reaction time to get the maximum concentration in most conditions was in range of 40 – 60 minutes. The optimized conditions for the formation of HCO4– were HCO3–: H2O2 molar ratio of 1:2.5 and pH of 9 with constant rate values of formation (k) and decomposition (k’) of 0.0598 min-1 and 0.0054 min-1, respectively.