不同载体携带纳米零价铁在多孔介质中的迁移特性  

Transport characteristics of nanoscale zero valent iron carried by three different vehicles in porous media

作　　者：苏燕[1] 赵勇胜[2] 梁秀春 李璐璐[1] 秦传玉[2] 

机构地区：[1]吉林大学地下水资源与环境教育部重点实验室,吉林长春130021 [2]吉林大学环境工程系,吉林长春130021 [3]吉林市水利水电勘测设计研究院,吉林吉林132013

出　　处：《中国环境科学》2015年第1期129-138,共10页China Environmental Science

基　　金：北京市教育委员会市属高校创新能力提升计划(TJSHG201310772028);吉林大学研究生创新基金(2014097);国家自然科学基金(41302183);博士后科学基金(2013M530987);高等学校博士点基金(20130061120085)

摘　　要：批次试验和模拟柱试验探讨了NZVI在3种载体（水、十二烷基硫酸钠（SDS）溶液和SDS泡沫）中的稳定性以及在3种载体携带作用下NZVI在多孔介质（0.25～0.5mm,0.5～0.9mm,0.9～1.4mm）中的迁移特性.由实验可知,对于NZVI悬浊液,在0.9～1.4mm,0.5～0.9mm和0.25～0.5mm介质中,NZVI从模拟柱中的溢出率分别为20.9％,17.4％和6.5％,NZVI在介质中分布的均匀性关系为0.9～1.4mm＞0.5～0.9mm＞0.25～0.5 mm;对于SDS-NZVI悬浊液,NZVI在0.9～1.4mm和0.5～0.9mm介质中的迁移性较0.25～0.5mm介质远远增强,NZVI在介质中分布均匀性关系为0.5～0.9mm＞0.9～1.4mm＞0.25～0.5mm;对于NZVI负载泡沫,NZVI在0.5～0.9mm与0.25～0.5mm介质中的迁移性较NZVI悬浊液和SDS-NZVI悬浊液增强,NZVI在0.5～0.9mm介质中分布均匀性较好,0.25～0.5mm其次,0.9～1.4mm均匀性最差.研究结果表明,SDS溶液和SDS泡沫与水相比较均有效促进了NZVI在3种介质中的运移,然而对于0.9～1.4mm介质,SDS溶液对NZVI迁移的促进作用较SDS泡沫更明显,对于0.25～0.5mm介质,SDS泡沫对NZVI迁移的促进作用较SDS溶液更大.Batch and column experiments were conducted to discuss the stability of NZVI in three vehicles, such as water, sodium dodecyl sulfate （SDS） solution and SDS foam, and the transport properties in three diameter sands （0.25-0.5mm, 0.5-0.9mm, 0.9-1.4mm） within the three vehicles. Three main results Were obtained in this work. First, for bare NZVI suspension, the effluent rate of NZVI from column were 20.9%,17.4% and 6.5% for 0.9-1.4mm, 0.5-0.9mm and 0.25-0.5mm diameter sands, respectively. Moreover, the spatial distribution of NZVI particles in porous media met the following order： 0.9-1.4mm〉0.5-0.9mm〉0.25-0.5mm. For SDS-NZVI suspension, the delivery ability were more enhanced in 0.9-1.4mm, 0.5-0.9mm than that in 0.25-0.5mm diameter sand. The spatial distribution of NZVI particles in porous media met the following order： 0.5-0.9mm 〉0.9-1.4mm〉0.25-0.5mm. For NZVI-laden foam, the mobility of NZVI in porous media was enhanced in 0.5-0.9mm and 0.25-0.5mm diameter sands compared with that of NZVI suspension and SDS-NZVI suspension. The spatial distribution of NZVI particles in 0.5-0.9mm diameter sand was the best, followed by 0.25-0.5mm and 0.9-1.4m diameter sands. Finally, the results showed that the migration of NZVI in porous media was accelerated by SDS solution and SDS foam compared to water. Besides, the acceleration of transport of NZVI carried by SDS solution was relatively obvious in 0.9-1.4mm diameter sand, while the acceleration of transport of NZVI carried by SDS foam was greater than that by SDS solution in 0.25-0.5mm diameter sand.

关 键 词：载体 纳米零价铁 迁移特性 多孔介质 

分 类 号：X523[环境科学与工程—环境工程]