紫外光解加速喹啉生物降解和矿化的机制

On the Mechanism of UV Photolysis for Accelerating Quinoline Biodegradation and Mineralization

喹啉是一种较难生物降解的有机化合物,为此,分别采用3种方法对喹啉溶液进行生物降解,即直接生物降解(B)、紫外光解后再进行生物降解(P+B)和将草酸加入到喹啉溶液中再进行生物降解(OA+B).实验结果表明,采用方法(P+B)时,其降解和矿化速率比方法 B要分别高出27%和40%.通过对喹啉光解中间产物的分析发现,喹啉在光解过程中有草酸的生成,因而推测是草酸作为电子供体,通过共基质的原理加速了喹啉的初始反应速率.这一推测通过直接向喹啉溶液中加入草酸,其降解和矿化速率与经过紫外光解预处理的实验结果相似而得以证明.

As quinoline is a kind of recalcitrant organic compounds ,in this work ,three protocols ,direct biodegradation（B） ,biodegradation after UV photolysis（P＋B） ,and biodegradation after adding oxalic acid into quinoline solution（OA＋B） ,were employed for quinoline biodegradation .The experimental results in‐dicated that quinoline biodegradation and mineralization were accelerated by 27% and 40% by （P＋B） than that by protocol B .Analysis on quinoline photolytic intermediates gives that oxalic acid generated during photolysis ,which hypothesize that oxalic acid released electrons to accelerate initial quinoline mono‐oxy‐genation reaction by means of co‐substrate .The hypothesis was valuated by protocol （OA＋ B） ,in which the quinoline biodegradation and mineralization were similar to protocol （P＋B） .