二乙基羟胺-臭氧体系降解邻苯二甲酸二甲酯机理研究
发布时间：2018-07-31 11:59
【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。
[Abstract]:Diethylhydroxylamine (DEHA) was used to promote the degradation of dimethyl phthalate (DMP),) in water by ozone and a O_3/DEHA system was established to enhance the oxidation ability of O _ (3). The effects of pH DEHA dosage, ozone flux and DMP dosage on the O_3/DEHA system and the oxidation mechanism of the system were investigated. The degradation products of DMP were analyzed by gas chromatography / mass spectrometry (GC/MS). The results showed that: DEHA could effectively promote the decomposition of ozone, and the degradation rate of DMP was significantly increased under acidic condition (pH3). When the dosage of DEHA was 25 渭 mol/L, the degradation rate of DMP increased with the increase of ozone flux, and decreased with the increase of DMP dosage. The addition of tert-butanol (TBA) significantly inhibited the degradation of DMP, which proved that DEHA promoted the decomposition of O _ 3 under acidic conditions, and the free radical played a major role in the degradation of DMP. Through product analysis, it can be deduced that the degradation pathway of DMP in O_3/DEHA system mainly starts from the breaking of carbon chain in benzene ring, and forms acid and lipids in the middle, and finally mineralizes into water and carbon dioxide.
【作者单位】： 四川大学建筑与环境学院;
【基金】：国家自然科学基金资助项目(51508353)
【分类号】：X703
[Abstract]:Diethylhydroxylamine (DEHA) was used to promote the degradation of dimethyl phthalate (DMP),) in water by ozone and a O_3/DEHA system was established to enhance the oxidation ability of O _ (3). The effects of pH DEHA dosage, ozone flux and DMP dosage on the O_3/DEHA system and the oxidation mechanism of the system were investigated. The degradation products of DMP were analyzed by gas chromatography / mass spectrometry (GC/MS). The results showed that: DEHA could effectively promote the decomposition of ozone, and the degradation rate of DMP was significantly increased under acidic condition (pH3). When the dosage of DEHA was 25 渭 mol/L, the degradation rate of DMP increased with the increase of ozone flux, and decreased with the increase of DMP dosage. The addition of tert-butanol (TBA) significantly inhibited the degradation of DMP, which proved that DEHA promoted the decomposition of O _ 3 under acidic conditions, and the free radical played a major role in the degradation of DMP. Through product analysis, it can be deduced that the degradation pathway of DMP in O_3/DEHA system mainly starts from the breaking of carbon chain in benzene ring, and forms acid and lipids in the middle, and finally mineralizes into water and carbon dioxide.
【作者单位】： 四川大学建筑与环境学院;
【基金】：国家自然科学基金资助项目(51508353)
【分类号】：X703
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