Formations of Active Species and By-Products in Water by Pulsed High-Voltage Discharge

摘要

Formations of active species and by-products are different from bubbling different gases in a pulsed high-voltage discharge reactor. The identification of all the products and the formation rate determination of active species are quite important as the process is applied to wastewater disposal. Serials of measurements were conducted to do the identifications and determinations in this paper. Amounts of; OH all increased but that of H_2O_2 all decreased by bubbling gas. The; OH formation rate was 3.49 x 10~(-7), 3.56 x 10~(-7), 3.21 x 10~(-7) and 1.94 x 10~(-7) mol l~(-1) s~(-1) with bubbling nitrogen, argon, air and oxygen respectively, but it was 1.61 x 10~(-7) mol s~(-1) l~(-1) without bubbling. Without any bubbling, the H_2O_2 formation rate was up to 6.53 x 10~(-6) mol l~(-1) s~(-1), while it was 9.97 x 10~(-7), 1.663 x 10~(-7), 1.73 x 10~(-6) and 3.14 x 10~(-6) mol l~(-1) s~(-1) with bubbling nitrogen, argon, air and oxygen, respectively. NO_2~- and NO_3~- was detected in discharged water with bubbling nitrogenous gas. Their formation made the pH decreased.