水中染料酸性嫩黄的超声/H_2O_2降解动力学研究

采用超声/H2O2降解水中酸性嫩黄染料,探讨了超声波/H2O2降解酸性嫩黄的动力学规律并考察了超声波功率、染料初始浓度、H2O2用量以及初始pH对降解速率的影响。结果表明,超声波对酸性嫩黄的降解以及超声波/H2O2对酸性嫩黄的协同降解均符合一级反应动力学规律,降解速率常数随超声波功率的增大而增大,随染料初始浓度的增大而减小;投加适量的H2O2可提高降解速率,但H2O2用量过高反而会使降解速率减慢;溶液pH<5时,降解速率较快,且pH越小,降解速率越快;pH≥5时,降解速率较慢。

Degradation Kinetics of Acid Yellow in Water by Ultrasound/H2O2

Ultrasound/H2O2 was used to degrade acid yellow in water. The degradation kinetics law was discussed and effects of ultrasound power, H2O2 concentration, pH and initial concentration of acid yellow on degradation efficiency were investigated. Results showed that the degradation by ultrasound/H2O2 or ultrasound conforms to first-order reaction law, with degradation rate constant increasing with ultrasound power and decreasing with increasing initial concentration of acid yellow. The degradation efficiency can be improved by adding H2O2, but over dosage of H2O2 will result in decline of degradation rate. Degradation rate constant was higher and degradation rate increased with decreasing pH when pH was less than 5 while the degradation rate constant was lower when pH was more than 5.