钙基复合氧化物对五氯酚生成二噁英的阻滞作用  

Inhibition of calcium-based composite oxide on PCDD/Fs formation from PCP

作　　者：杨帆[1,2] 黎烈武[2] 童东革[1] 黄林艳[2] 芦会杰[2] 李倩倩[2] 黄鑫辰 赵彦辉[2] 李宾克 苏贵金[2] 

机构地区：[1]成都理工大学材料与化学化工学院,成都610059 [2]中国科学院生态环境研究中心环境化学与生态毒理学国家重点实验室,北京100085

出　　处：《环境化学》2015年第8期1439-1445,共7页Environmental Chemistry

基　　金：国家863项目(2012AA062803);北京市科技计划(Z141100001014001)资助

摘　　要：以市售的Ca O为阻滞剂,分别添加Mg O、Ce O2、Ba O、γ-Al2O3金属氧化物形成钙基复合氧化物,通过探究它们对前驱体五氯酚(PCP)生成PCDD/Fs反应的阻滞作用,讨论了Mg O、Ce O2、Ba O、γ-Al2O3金属氧化物对Ca O阻滞作用的影响.结果表明,在280℃下加热2 h,钙基复合氧化物对PCP生成PCDD/Fs的阻滞活性都很高.在PCDD/Fs的生成总量上,Ce O2、Ba O、γ-Al2O3金属氧化物对Ca O的阻滞效果起到促进作用;但在ITEQ方面,仅Ba O对Ca O的阻滞效果有促进作用.Ca O与Ba O钙基复合氧化物对PCP生成PCDD/Fs的阻滞效率达到99.98%,总毒性当量阻滞效率TSEI-TEQ达到99.62%.钙基复合氧化物可能的阻滞机理是Ca O、Mg O、Ce O2、Ba O、γ-Al2O3均具有一定的碱性,能与酚类前驱体发生中和反应,阻滞了Ullman反应的发生,进而减少了PCDD/Fs的生成.Inhibition of calcium-based composite oxides on the formation of PCDD/Fs from PCP precursor was investigated in a laboratory-scale reactor at 280 ℃ for 2 h. The calcium-based composite oxides were prepared by mixing Ca O with Mg O,Ce O2,Ba O and γ-Al2O3,respectively.The results show that the total suppressing efficiency（ TSE） of PCDD/Fs formation by these calcium-based composite oxides were all rather high. The addition of Ce O2,Ba O and γ-Al2O3 into Ca O reduced the total amount of produced PCDD/Fs. However,only Ba O increased the TSE in I-TEQ（ TSEI-TEQ） of the newly formed PCDD/Fs. The TSE and TSEI-TEQof PCDD/Fs formation over Ca O and Ba O mixture were 99. 98% and 99. 62%,respectively. It was speculated that since Ca O,Mg O,Ce O2,Ba O and γ-Al2O3 are alkaline,they can react with the PCP precursor,to prevent the occurrence of Ullman reaction and the formation of PCDD/Fs.

关 键 词：PCP PCDD/FS 阻滞 钙基复合氧化物 

分 类 号：X592[环境科学与工程—环境工程]