二乙基羥胺-臭氧體系降解鄰苯二甲酸二甲酯機(jī)理研究
發(fā)布時(shí)間：2018-07-31 11:59
【摘要】：采用二乙基羥胺(DEHA)促進(jìn)臭氧(O_3)降解水中鄰苯二甲酸二甲酯(DMP),并建立了強(qiáng)化O_3氧化能力的O_3/DEHA體系。主要探索了在O_3/DEHA體系中p H、DEHA投量、臭氧通量和DMP投量對該體系的影響及體系的氧化機(jī)理,并通過氣相色譜/質(zhì)譜(GC/MS)對DMP的降解產(chǎn)物進(jìn)行了分析。結(jié)果表明:DEHA能夠有效促進(jìn)臭氧的分解且在酸性條件下(p H=3)明顯提高DMP的降解率,DEHA投量為25μmol/L時(shí)促進(jìn)效果最佳;DMP降解速率隨臭氧通量的增加而增加,隨DMP投量的增加而減小,通過動(dòng)力學(xué)計(jì)算該反應(yīng)符合擬一級動(dòng)力學(xué)反應(yīng);投加叔丁醇(TBA)明顯抑制了DMP的降解,證實(shí)了在酸性條件下DEHA促進(jìn)O_3分解產(chǎn)生了·OH,該自由基對DMP的降解起主要作用;通過產(chǎn)物分析可推導(dǎo)出O_3/DEHA體系中DMP的降解途徑主要從苯環(huán)上碳鏈的斷裂開始,中間生成酸類和脂類化合物,最終礦化為水和二氧化碳。
[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.
【作者單位】： 四川大學(xué)建筑與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51508353)
【分類號】：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.
【作者單位】： 四川大學(xué)建筑與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51508353)
【分類號】：X703
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