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.
作者
卢思颖
孙中恩
封莉
张立秋
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)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
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)
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
ferromagnetic sludge-based activated carbon
transition metal
catalytic ozonation
p-chlorobenzoic acid
作者简介
责任作者, 教授, zhangliqiu@163.com
