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工程科学与技术:2016,48(3):209-214
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二乙基羟胺-臭氧体系降解邻苯二甲酸二甲酯的机理学研究
(四川大学建筑与环境学院)
Mechanism Research on the Diethyl Hydroxylamine-Ozone System Degradation Dimethyl Phthalate
(College of Architecture and Environment, Sichuan Univ)
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投稿时间:2015-10-26    修订日期:2016-01-20
中文摘要: 本研究采用二乙基羟胺(DEHA)促进臭氧(O3)降解水中邻苯二甲酸二甲酯(DMP),并建立了强化O3氧化能力的O3/DEHA体系。主要探索了在O3/DEHA体系中pH、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(pH=3)明显提高DMP的降解率,DEHA投量为25μΜ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浓度的增加而减小,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)能够明显抑制DMP的降解,验证了在酸性条件下,·OH对DMP的降解起主要作用;通过产物分析可推导出O3/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: This research adopts the diethyl hydroxylamine (DEHA) promote ozone (O3) degradation of dimethyl phthalate (DMP), and established the O3 / DEHA system that can enhanced O3 oxidation ability. It mainly explored the effect of pH, DEHA dosages, ozone flux and DMP dosages in O3 / DEHA system and the oxidation mechanism in the system. And the degradation products were analyzed through gas chromatography /mass spectrometry (GC/MS). Experimental results showed that the DEHA can effectively promote the decomposition of ozone and obviously improved DMP degradation rate under acid condition (pH = 3), the promoting effect was best when DEHA dosage was 25 μΜ. DMP degradation rate increased with the increase of ozone flux, and increased with the decreases of DMP concentration, the reaction conformed to the first order kinetics reaction by dynamics calculation. Adding tert-butyl alcohol (TBA) significantly inhibited the degradation of the DMP, confirmed the ·OH plays an important role in the degradation of DMP under acid condition. Through the analysis of the product, it can be deduced that DMP degradation pathway in O3 / DEHA system mainly started from the chain scission of benzene ring, and then the intermediates transformed to esters molecules and acids which were finally mineralized to water and carbon dioxide.
文章编号:201501125     中图分类号:    文献标志码:
基金项目:51508353;纳米双金属复合氧化物催化臭氧的效能及机理研究
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引用文本:
张永丽,刘蓓,张静,周鹏,史雅楠.二乙基羟胺-臭氧体系降解邻苯二甲酸二甲酯的机理学研究[J].工程科学与技术,2016,48(3):209-214.
Zhang Yongli,Liu Bei,Zhang Jing,Zhou Peng,Shi Yanan.Mechanism Research on the Diethyl Hydroxylamine-Ozone System Degradation Dimethyl Phthalate[J].Advanced Engineering Sciences,2016,48(3):209-214.