Fe_3O_4/ZrO_2-H_2O_2非均相类Fenton体系对3,4-二氯三氟甲苯的降解  

Degradation of 3,4-dichlorobenzotrifluoride by Fe_3O_4/ZrO_2-H_2O_2 heterogeneous Fenton-like system

作　　者：孙正男 杨琦[1] 纪冬丽[1] 李博[1] 王士东[1] 郑琳[1] 

机构地区：[1]中国地质大学(北京)水资源与环境学院北京水资源与环境工程重点实验室,北京100083

出　　处：《环境工程学报》2015年第8期3590-3596,共7页Chinese Journal of Environmental Engineering

基　　金：北京市产学研项目(51900265005);国家"水体污染控制与治理"科技重大专项(2009ZX07207-008;2009ZX07419-002;2009ZX07207-001;2015ZX07406005);中央高校基本科研业务费专项资金(2652013101;2652013086;2652013087;2652015118;2652015005;2652015006);重点防控重金属汞;铬;铅;镉;砷便携/车载/在线监测仪器开发与应用示范项目(2012YQ060115)

摘　　要：以浸渍法制备的新型纳米Fe3O4/Zr O2为催化剂,3,4-二氯三氟甲苯(3,4-DCBTE)为目标污染物,用Fe3O4/Zr O2-H2O2非均相类Fenton体系对目标污染物进行降解,考察催化剂的催化效果和温度、pH、H2O2投加量和掺杂比等因素对催化剂催化效果的影响。结果表明,以纳米Fe3O4/Zr O2作为催化剂的非均相类Fenton体系对3,4-二氯三氟甲苯的处理效果极佳;随着温度的升高,纳米Fe3O4/Zr O2的催化效果不断提高;当pH降低时,催化剂的催化效果有明显提升,原始pH(pH=5.7)时反应去除效果最佳,去除率可达88.6%;催化剂用量的增加同样可以提高3,4-二氯三氟甲苯的降解效率;催化剂中Fe3O4∶Zr O2的物质的量比为1∶2时效果较其他掺杂比的催化剂效果更好,去除率最终可以达到96.82%;当H2O2投加量增加时,3,4-二氯三氟甲苯的降解效率先提高后降低,投加量为0.3 m L时去除效果最好,几乎可以完全去除目标有机物。以Fe3O4/Zr O2-H2O2非均相类Fenton体系处理3,4-二氯三氟甲苯时,目标污染物的降解符合一级反应动力学。3,4-dichlorobenzotrifluoride （3,4-DCBTE） was dehalogenated with oxidation treatment by means of heterogeneous Fenton-like system, using nanoseale Fe3Q/ZrO2 as catalyst. This innovative nanoscale catalyst was prepared by the impregnated method. To find the most optimum catalytic conditions of nanoseale Fe3O4/ZrO2, the influence factors were investigated. The results indicated that the treatment effect of 3,4- DCBTE was significantly improved by adding nanoscale Fe3O4/ ZrO2, the removal efficiency can reach 94.59% and the removal efficiency only need 20 minutes to reach 80%. As the temperature increasing, the catalytic effect of nanoscale Fe304/ZrO2 catalyst was constantly improved obviously. As the pH reducing, the effect of nanoscale Fe3O4/ZrO2 catalyst was also improved, when pH was not adjusted （pH = 5.7） , the removal efficien- cy was the best which can reach 88.6%. Also, an increase with the amount of catalyst could enhance the degra- dation effect. If the molar ratio of Fe3O4： ZrO2 is 1 ： 2, the catalytic effect was better than others doping ratio cat- alysts. With the increase of dosage of hydrogen peroxide （H2O2）, the degradation efficiency of 3,4-DCBTE firstly increased and then decreased. The optimum removal efficiency was observed with the dosage of 0. 3 mL. The results also suggested that the reaction oroeess followed the first-order kinetics.

关 键 词：非均相类Fenton体系 纳米Fe3O4/ZrO2 3 4-二氯三氟甲苯(3 4-DCBTE) 

分 类 号：X703[环境科学与工程—环境工程]