聚合硅酸铁催化臭氧氧化硝基氯苯的效能

Iron silicate polymer catalyzed ozonation for removing chloronitrobenzenes in drinking water

摘要:

为了考察实验室合成的聚合硅酸铁在臭氧氧化过程中的作用以及在实际工程中的应用价值,用聚合硅酸铁为催化剂,研究了在静态试验和连续流实验两种反应体系中催化臭氧氧化去除硝基氯苯(CNBs)的效能.静态实验结果表明,在去离子水本底条件下,催化臭氧氧化与单独臭氧氧化相比可以使2-氯硝基苯(oCNB),3-氯硝基苯(mCNB)和4-氯硝基苯(pCNB)去除率分别提高41%、39%和46%;在自来水本底条件下也可分别提高27%、30%和27%;在以自来水为本底的连续流实验中聚合硅酸铁催化臭氧氧化与单独臭氧氧化相比可使oCNB、mCNB和pCNB的去除率分别提高20%、24%和20%.叔丁醇对催化臭氧氧化的抑制作用表明聚合硅酸铁催化臭氧氧化CNBs的作用机理是以羟基自由基为主的间接氧化过程.

Abstract:

In order to study the function and the application value of iron silicate polymer,a series of experiment were conducted in different ozonation reaction systems for degradation of chloronitrobenzenes(CNBs)in aqueous solution. Static test results showed that the iron silicate polymer was activated in catalytic ozonation for degradation CNBs not only in distilled water,but also in tap water; compared with the ozone alone,in deionized water condition,catalyzed ozonation could make the removal efficiency of oCNB,mCNB and pCNB enhanced by 41% ,39% and 46% respectively; in tap water condition,catalyzed ozonation could make the removal efficiency of oCNB,mCNB and pCNB enhanced by 27%,30% and 27% respectively. In a continuous flow process under the tap water condition,catalyzed ozonation could enhance the removal efficiency of oCNB,mCNB and pCNB by 20% ,24% and 20% respectively. As tert-butyl alcohol can inhibit the efficiency of catalyzed ozonation of CNBs,the mechanism of iron silicate polymer enhanced ozone oxidation of CNBs can be identified as that iron silicate polymer catalyzed ozone to decompose into hydroxyl radicals which further break up the molecule of CNBs.