UV/H<sub>2</sub>O<sub>2</sub>体系光降解邻苯二甲酸二丁酯研究

UV/H₂O₂体系光降解邻苯二甲酸二丁酯研究

摘要: 研究了邻苯二甲酸二丁酯(DBP)在UV/H₂O₂体系中的光降解.结果表明:DBP在UV/H₂O₂体系中能很好地降解,且其光降解速率大于在单一UV辐照下的光降解速率;在pH为中性条件下DBP的光降解速率最快,而在强酸性或碱性条件下DBP的光降解速率均较低;在一定H₂O₂浓度范围内,DBP的光降解速率随c(H₂O₂)的升高而增大,但当c(H₂O₂)过高时,其对·OH自由基的清除作用使DBP的光降解速率减慢.DBP的光降解速率随其初始质量浓度的增大而降低;在实验质量浓度范围内,DBP的光降解速率常数近似与其初始质量浓度成负一级反应动力学关系.

Abstract: The photodegradation of dibutyl phthalate（DBP） in UV/H₂O₂ systems was studied.The results showed that DBP was more effectively degraded by UV/H₂O₂ system than by UV light.The DBP displayed faster degradation rate in neutral medium than in acid or alkali medium.The rate of destruction of DBP increased when increasing concentration of H₂O₂,but the effect decreased at high level of H₂O₂ due to its removal effect to ·OH.The initial mass concentration of DBP presented negative effect to pseudo-first-order reaction kinetics constant of its photodegradation in UV/H₂O₂ system.