腐殖酸协同Mn^(2+)催化臭氧氧化降解五氯苯酚  

Synergistic effect of Mn^(2+) and humic acid in catalytic ozonation of pentachlorophenol

作　　者：任健[1,2] 何松波[1] 孙承林[1] 

机构地区：[1]中国科学院大连化学物理研究所洁净能源国家实验室,辽宁大连116023 [2]中国科学院大学,北京100049

出　　处：《现代化工》2013年第7期68-71,73,共5页Modern Chemical Industry

基　　金：国家重点基础研究发展计划(973)项目(2009CB421606);国家高技术研究发展计划("863"计划)项目(2009AA063903);中国科学院知识创新工程领域前沿项目(K2009D02)

摘　　要：研究了向Mn2+催化臭氧氧化体系中添加少量腐殖酸对PCP去除效率的影响。结果表明:腐殖酸与Mn2+在催化臭氧氧化降解PCP过程中存在着明显的协同效应。在ρ(PCP)=30 mg/L,n(HA)∶n(PCP)值为3.18的条件下,氧化反应30 min,PCP去除率高达98.63%。分别向Mn(Ⅱ)/O3+HA、Mn(Ⅱ)/O3、O3+HA及单独臭氧氧化体系中加入.OH自由基抑制剂叔丁醇后,各个氧化体系中PCP的降解效率均受到了不同程度的抑制。实验结果表明,Mn(Ⅱ)/O3+HA氧化降解PCP以自由基的氧化为主,其拟一级反应表观速率常数为0.133 min-1,分别是Mn(Ⅱ)/O3及单独臭氧氧化体系的1.87、8.31倍。The effect of adding small amount of humic acid in the Mn^2＋ catalytic ozonation system on the degradation efficiency of PCP is investigated.The results show that the marked synergistic effect between HA and Mn^2＋ for the ozonation of PCP is noticed at an initial ρ（PCP） of 30 mg/L and reaction time of 30 min.The PCP removal rate can be up to 98.63% with the optimal mole ratio of 1.6 between HA and PCP.Furthermore,the reduction of PCP degradation efficiency to some extent are observed in all cases by the addition of ·OH radical scavenger,t-butanol in the Mn（Ⅱ）/O3 ＋ HA,Mn（Ⅱ）/O3 and O3 ＋ HA oxidation processes and even the single ozonation system.In addition,the apparent pseudo-first-order kinetic constant of PCP degradation by Mn（Ⅱ）/O3 ＋ HA process is 0.133 min-1,which is 1.87 and 8.31 fold of that by Mn（Ⅱ）/O3 and single ozonation process,respectively.

关 键 词：臭氧氧化 POPS 五氯苯酚 腐殖酸 

分 类 号：X703.1[环境科学与工程—环境工程]