钛酸钡压电臭氧化降解水中的硝基苯  

Degradation of nitrobenzene from water by piezoelectric ozonation of barium titanate

作　　者：庄玮 杨婧[1] 龚冰柔 郑莹 赵纯[1] ZHUANG Wei;YANG Jing;GONG Bing-rou;ZHENG Ying;ZHAO Chun(College of Environment and Ecology,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学环境与生态学院,重庆400030 [2]四川省城乡建设研究院,四川成都610043

出　　处：《中国环境科学》2021年第10期4654-4661,共8页China Environmental Science

基　　金：国家自然科学基金资助项目(22076015);重庆市自然科学基金(cstc2019jcyj-msxmX0463)。

摘　　要：将臭氧(O_(3))体系与压电(PE)体系相结合提出了压电臭氧化(PE-O_(3))体系,探究了该体系对难降解有机污染物硝基苯(NB)的降解效果,考察了转速、O_(3)浓度、钛酸钡(BT)投加量和初始pH值对NB去除的影响.此外,探讨了PE-O_(3)体系降解NB过程中存在的活性物质,并分析了反应机理.结果表明:PE-O_(3)体系对NB的降解体现出明显的协同效应(协同系数高达5.04),在15min内对NB的去除率高达85.37%,反应符合一级反应动力学规律,k为0.1256min^(-1).此外,PE-O_(3)体系在120min内对NB实现了74.06%的矿化.随着磁力转子转速的增加,体系反应速率提升,当转速提高到1500r/min时,反应速率常数可达到0.1446min^(-1).反应速率随体系中BT浓度和O_(3)浓度的增加而增加,但一定程度后,增长趋势变缓.NB降解速率随pH值的增加而增大,当pH值为9.0时,在15min后体系中的NB降解率达85.69%.反应过程中产生的是降解NB的主要活性物质.The single ozone process is difficult to degrade refractory pollutants.Although the electrolysis ozonation process has been proven to effectively degrade and mineralize refractory organic pollutants,it is limited by electrode materials and mass transfer.The piezoelectric ozonation(PE-O_(3))process was proposed by combined the ozone(O_(3))process with the piezoelectric(PE)process.The PE-O_(3) process showed a significant synergistic effect(the synergy index=5.04)on the degradation of nitrobenzene(NB).Besides,the degradation ratio of NB was 85.37%in PE-O_(3) process within 15min,and the reaction conformed to pseudo first order(k=0.1256min^(-1)).The TOC removal ratio was 74.06%in PE-O_(3) process within 120min.As the rotation speed increased,the reaction rate increased.However,the reaction rate constant could reach 0.1446min^(-1) when the rotation speed increased to 1500r/min.The reaction rate increased with the increase of BT and O_(3) concentration in PE-O_(3) process,but the increasing trend slowed down after a certain degree.Moreover,the degradation rate of NB increased with the increase of pH value.When the pH value is 9.0,the degradation rate of NB in the system reached 80%after 15min.Notably,the•OH produced during the reaction is the main active species to degrade NB.

关 键 词：钛酸钡 压电臭氧化 硝基苯 压电 臭氧 

分 类 号：X52[环境科学与工程—环境工程]