超声辐照对水中双酚A的降解动力学探究.pdfVIP

超声辐照对水中双酚A的降解动力学研究 张可佳，高乃云’，黎雷，马艳 (同济大学污染控制与资源化研究国家重点实验室上海20009) 摘要：采用800kHz频率的超声对双酚A(BPA)的降解效果和动力学规律进行研究。通过投加不 同的物质(如叔丁醇、H202、腐殖酸)和向水中曝气等，考察不同因素对超声降解BPA的影响。 结果表明，超声对BPA的降解过程符合准一级动力学，其降解速率随BPA初始浓度的增加而 降低。投加叔丁醇明显抑制BPA的降解，证明BPA的降解途径主要是oOH氧化。当投加H202 摩尔比200时，降解速率不升反降．溶液中存在腐殖酸会同BPA竞争=OH，并随着腐殖酸浓 度的增加，BPA的降解速率下降．额外曝气会干扰BPA分子靠近空化泡界面，阻碍与=OH的反 应，不利于BPA的降解． 关键词：超声；双酚A；自由基氧化；H202；腐殖酸 onKineticsofUItrasonic of Ain Study DegradationBisphenoI Water kineticsof of A atthe Abstract：Theeffectand ultrasonic degradationbisphenolIBPA)by of800kHzwerestudied．Theeffectsofsome as additives，such frequency t-buryIalcohol，H202， humicacidandair asexternalfactors．Theresultsshowthatthe bubbles，were investigated ultrasonic ofBPAfollowsa orderkineticmodelandtherateconstant degradation pseudo—first decreaseswiththe initialconcentration．Itisidentifiedthat radicalisamajor increasing hydroxyl intheultrasonic ofBPA alcoh01．Therateconstantincreases participant degradationbyt-buryI by 0．1 32％atlow concentrationof ofBPAishinderedwith H202 mmol／L．However,thedegradation thefurther ofthemolarisabout200：1between additionof rate H202．Theboundarypoint H202 and acidin solutionhindersthe ofBPAandtherate BPA．Moreover,humicaqueous degradation constant withthe humicaciddose．T