T-FMSAC制备及其催化臭氧氧化去除p-CBA效能研究  

Preparation of T-FMSAC and its catalytic ozonation performance on the removal of p-CBA in water

作　　者：卢思颖 孙中恩[1] 封莉[1] 张立秋[1] ZHANG Li-qiu;LU Si-ying;SUN Zhong-en;FENG Li(Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China)

机构地区：[1]北京林业大学环境科学与工程学院,北京100083

出　　处：《中国环境科学》2017年第6期2139-2144,共6页China Environmental Science

基　　金：北京市教委共建项目(2015GJ-02);国家自然科学基金项目(51178046)

摘　　要：以污泥基活性炭为基质,采用化学共沉淀法制备了不同过渡金属(Mn、Co和Cu)掺杂的铁磁污泥基活性炭(T-FMSAC,T=Mn、Co、Cu),重点考察了过渡金属种类及其掺杂比例对T-FMSAC催化臭氧氧化去除水中对氯苯甲酸(p-CBA)效能的影响,并对臭氧与T-FMSAC催化剂的最佳投量进行了研究确定.结果表明,在臭氧投加量为1mg/L,催化剂投加量为40mg/L条件下,反应进行40min后,Mn-FMSAC的催化活性最高,其催化臭氧氧化对p-CBA的去除率为76%,高于Co-FMSAC(72%)及Cu-FMSAC(65%).并且,随着金属掺杂比例的增加(100:1,50:1,25:1,10:1(污泥量:金属掺杂量,W:W)),T-FMSAC催化臭氧氧化对p-CBA的去除率逐渐降低.在100:1掺杂比例下,催化剂不仅能够简单地通过磁铁分离,且具备最佳催化活性.100:1Mn-FMSAC催化臭氧氧化工艺对p-CBA的去除率随臭氧浓度的增加而增加;当臭氧投加量为1mg/L时,100:1Mn-FMSAC催化剂的最佳投量为40mg/L.叔丁醇的加入显著抑制了100:1Mn-FMSAC催化臭氧氧化降解p-CBA的效能,表明该反应过程遵循羟基自由基反应机制.Basing on the activated carbon prepared from sludge,different transition metals(Mn,Co,and Cu)dopedferromagnetic sludge-based activated carbons(T-FMSAC,T=Mn,Co,and Cu)were prepared by chemicalcoprecipitation method.The effects of metal species and doping ratio on the removal efficiency of p-chlorobenzoic acid(p-CBA)in water by T-FMSAC catalytic ozonation were investigated,and the optimal dosages of initial ozone andT-FMSAC catalyst were further determined.Experimental results showed that,after40minutes of ozonation,Mn-FMSACexhibited the highest catalytic activity under the initial ozone and catalyst dosage of1mg/L and40mg/L respectively,andthe removal efficiency was76%,higher than that for Co-FMSAC(72%)or Cu-FMSAC(65%).In addition,the removalefficiency of p-CBA decreased with the increase in the doping ratio from SAC:metal=100:1to10:1.With the doping ratioof100:1,the T-FMSAC exhibited the optimal magnetic separation property and catalytic activity.The optimal conditionfor100:1Mn-FMSAC catalytic ozonation was determined to be[O3]0=1mg/L and[FMSAC]0=40mg/L.Besides,theinhibition of p-CBA degradation by tertiary butyl alcohol(TBA)indicated that this process followed the hydroxyl radicalreaction mechanism.

关 键 词：铁磁污泥基活性炭 过渡金属 臭氧催化氧化 对氯苯甲酸 

分 类 号：X703[环境科学与工程—环境工程]