摘要
以十二烷基苯磺酸钠(SDBS)为目标物,研究了臭氧氧化、活性炭吸附、活性炭催化臭氧化对SDBS的去除特性,并研究了天然有机物(NOMs)对催化臭氧降解SDBS的影响.结果表明,活性炭催化臭氧化较单独使用臭氧或活性炭对SDBS去除效率有显著提高,而且最有效阶段在反应初的20 min之内及臭氧和反应物浓度较高的反应阶段.时间为5 min时(通常的水力停留时间),在臭氧及活性炭单独作用下,SDBS的降解率分别为17%、12.2%,而在活性炭催化臭氧化体系中,SDBS的降解率达到54.2%,明显优于单独使用臭氧氧化、活性炭吸附的处理效果之和.活性炭催化臭氧化机制可能是由于活性炭促进臭氧降解形成更多的自由基;也可能是由于活性炭对反应物和臭氧的强烈吸附造成反应物浓度富集而提高反应效率.经过较长时间、高浓度臭氧预处理并没有显著改变活性炭催化臭氧化降解SDBS的效果.模拟水样中NOMs的存在导致活性炭催化臭氧化效率有所下降,但在NOMs浓度不高的情况下,该系统仍可以对SDBS发挥较强的降解作用.
The anionic surfactant sodium dodecyl benzene sulfonate（SDBS） is employed as the target pollutant;the SDBS degradation in the processes of ozone（O3）,activated carbon（AC） and activated carbon catalytic ozonation were studied.The impact of natural organic matter（NOMs） on the degradation of SDBS by catalytic ozonation was also investigated.Results show that：SDBS removal by using activated carbon catalytic ozonation is higher than that of using single ozonation or AC adsorption respectively;and the most effective time is the early 20 min when the concentrations of ozone and SDBS are relatively high.In the first 5 min（general hydraulic retention time）,SDBS removals of the ozonation and AC adsorption were only about 17% and 12.2%,respectively;while the removal of catalytic ozonation reached 54.2% which was much more than the total removal of single ozonation and single adsorption,which showed significant efficiency of the catalytic ozonation.The mechanism of catalytic ozonation involves more radicals could be generated by ozone with the presence of AC;or much higher concentrations of both ozone and reactant would achieve,which enhances the reaction efficiency.Compared with the raw AC,AC experienced relatively long time and high concentration ozone treatment showed little effects on its decomposition efficiency of SDBS during catalytic ozonation.NOMs in the water samples decreased SDBS removals by catalytic ozonation;but the removals kept high under relatively low NOMs concentrations.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2011年第3期699-704,共6页
Environmental Science
基金
太原市科技局战略性新兴产业培育专项(2010)
关键词
活性炭
催化臭氧化
臭氧
阴离子表面活性剂
activated carbon（AC）
catalytic ozonaiton
ozone
anionic surfactant
