为了解普萘洛尔( PRO)在自然水体中的光化学行为及影响因素,采用350 W氙灯模拟日光(λ>290 nm) ,研究了不同初始浓度、初始pH、无机离子、低分子量有机酸共存条件下PRO的光解过程及机制.结果表明,PRO的光解遵循准一级反应动力学,光解速率常数( k)随初始浓度的增加而升高,两者呈显著正相关关系( R2>0.95) .光解过程包括了激发三重态PRO( 3 PRO?)参与的直接光解,以及羟基自由基( ·OH)和单线态氧( 1 O2 )参与的自敏化光解,以直接光解过程为主.随着溶液初始pH的升高,PRO的光解加快.共存无机阴、阳离子均抑制PRO的光解,抑制率随阳离子价态升高而增加.羧酸抑制PRO的光解,抑制能力与羧基、烷基和羟基数目相关.
Photodegradation and influencing factors of propranolol ( PRO) under simulated sunlight were investigated. Effects of PRO initial concentrations, solution pH, coexsit inorganic ions and low molecular organic acids on the photodegradation were studied. The results showed the photodegradation followed the pseudo-first-order kinetics. The rate constant of PRO photolysis ( k) increased with increasing initial concentration, and showed a significant positive correlation ( R2>0.95) . PRO underwent direct photolysis via excited triplet PRO ( 3 PRO?) , and self-sensitized photolysis via hydroxyl radical ( ·OH) and singlet oxygen ( 1 O2 ) . Direct photolysis rate was much greater than the rate of self-sensitized photolysis. The increasing k value was also accompanied with higher pH of the solution. The coexistence of inorganic anion and cation inhibited the photolysis of PRO, and the inhibition rate increased with the increase of the ion valence state. The inhibition ability of carboxylic acid on the photodegradation of PRO is related to the number of carboxyl groups, alkyl groups and hydroxyl groups.
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