Study on degradation of p-Nitrophenol in aqueous solution by the ultrasound and the reaction kinetic

摘要

The study on degradation of p-Nitrophenol in aqueous solution by ultrasound process has been given in this paper. The influence on degradation and laws by several factors, which include the initial concentration, the initial pH, the energy density, the reaction temperature and the presence of saturated gas, have been discussed. The results show that the initial concentration, the initial pH, the energy density are the main factors. The p-Np of lower concentration can be degraded in lower pH and higher energy density. Moreover, within the concentration range which is studied, the reaction follows the first-order kinetic reaction, when the initial concentration is over 60mg/L, the tendency which is the first-order velocity constant with the augment of initial concentration is not obvious sufficiently. Aerating into the solution contributes the degradation of p-Np, but the efficiency is not obvious, and the variation of temperature has almost no influence on the degradation of p-Np. Thought several simplifications of reaction process, the reaction dynamic equation has been constructed, that is dC/dt=-K1C=-0.0089C-0.87530(D-0.23)C,and it can describe ultrasound degradation of p-Nitrophenol properly. Compared to the test value, the calculated value caters on different concentration well, however, it has a certain deviation on different energy density.