二乙基羟胺-臭氧体系降解邻苯二甲酸二甲酯机理研究  

Mechanism Research on the Diethyl Hydroxylamine-ozone System Degradation Dimethyl Phthalate

作　　者：张永丽[1] 刘蓓[1] 张静[1] 周鹏[1] 史雅楠[1] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2016年第3期209-214,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51508353)

摘　　要：采用二乙基羟胺(DEHA)促进臭氧(O_3)降解水中邻苯二甲酸二甲酯(DMP),并建立了强化O_3氧化能力的O_3/DEHA体系。主要探索了在O_3/DEHA体系中p H、DEHA投量、臭氧通量和DMP投量对该体系的影响及体系的氧化机理,并通过气相色谱/质谱(GC/MS)对DMP的降解产物进行了分析。结果表明:DEHA能够有效促进臭氧的分解且在酸性条件下(p H=3)明显提高DMP的降解率,DEHA投量为25μmol/L时促进效果最佳;DMP降解速率随臭氧通量的增加而增加,随DMP投量的增加而减小,通过动力学计算该反应符合拟一级动力学反应;投加叔丁醇(TBA)明显抑制了DMP的降解,证实了在酸性条件下DEHA促进O_3分解产生了·OH,该自由基对DMP的降解起主要作用;通过产物分析可推导出O_3/DEHA体系中DMP的降解途径主要从苯环上碳链的断裂开始,中间生成酸类和脂类化合物,最终矿化为水和二氧化碳。Diethyl hydroxylamine （DEHA） was used to promote ozone （03 ） degradation of dimethyl phthalate （DMP）. The effect of pH, DEHA volumes,ozone flux and DMP volumes in O3/DEHA system and the oxidation mechanism were studied,and the degradation products were analyzed through gas chromatography/mass spectrometry （GC/MS）. Experimental results showed that under the condition of pH = 3 and DEHA dosage of 25 I.Lmol the DEliA can effectively improve DMP degradation rate. DMP degradation rate increases with tile increase of ozone flux and the decreases of DMP dosage,the reaction contorms to the first order kinetics reaction by dynamics calculation. Adding tertbutyl alcohol （TBA） significantly inhibits the degradation of the DMP, which confirms that the DEHA promote the decomposition of O3 and produced · OH under acid condition,so the free radicals plays an important role in the degradation of DMP.

关 键 词：臭氧 二乙基羟胺 邻苯二甲酸二甲酯 氧化 降解 

分 类 号：X131.2[环境科学与工程—环境科学]