生物表面活性剂改性对纳米铁/炭去除地下水中NO3--N的影响  

Effect of biological surfactant on the reduction of NO_3^--N in groundwater using nano iron/carbon

作　　者：高阳阳[1,2,3] 刘国[1,2,3] 陈西亮 张俊杰[1,2,3] 余雯雯[1,2,3] 

机构地区：[1]成都理工大学环境与土木工程学院,成都610059 [2]地质灾害防治与地质环境保护国家重点实验室,成都理工大学成都理工大学环境与土木工程学院,成都610059 [3]四川省环境保护地下水污染防治与资源安全重点实验室,成都理工大学成都理工大学环境与土木工程学院,成都610059

出　　处：《环境科学学报》2016年第9期3258-3265,共8页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.41272266)~~

摘　　要：纳米铁由于其反应活性强、来源广泛等优点被广泛应用在去除地下水NO-3-N污染中.利用生物表面活性剂对纳米铁进行改性可以避免采用化学表面活性剂改性对环境造成的二次污染.本研究采用鼠李糖脂、茶皂素、无患子3种生物表面活性剂对纳米铁进行改性后附着在活性炭上构成改性纳米铁/炭复合材料,通过批试验、沉降试验、迁移试验等研究生物表面活性剂对纳米铁/炭复合材料的改性作用.结果表明:鼠李糖脂、茶皂素、无患子对纳米铁/炭改性后去除NO-3-N效果最佳时的投加量分别为0.7%、1.0%、0.7%,此时对比三者改性作用,鼠李糖脂改性纳米铁/炭去除NO-3-N效果最佳,无患子改性纳米铁/炭迁移效果最佳;鼠李糖脂投加量在0.1%到1.3%范围内时,改性纳米铁/炭迁移能力随投加量的增加而增大.for the strong reactivity and extensive sources of Nano iron,it has been widely applied in treating the groundwater NO-3-N pollution. With the modification of nano iron with biological surfactant,second pollution by synthetic surfactants can be avoided. In this study,we provided rhamnolipid,tea saponin and sapindus as biological surfactant to modify nano iron,which was then attached to activated carbon. Batch experiments,settlement and migration experiments were carried out to investigate the effect of biological surfactant. Experimental results show that the optimum dosage of rhamnolipid,tea saponin and sapindus for NO-3-N removal was 0.7%、1.0% and 0.7%,respectively. rhamnolipid showed the highest NO-3-N removal performance,and sapindus showed the optimum migration. Within the scope of 0. 1% to 1. 3%,the migration ability of modified nano iron increases with the dosage of rhamnolipid.

关 键 词：生物表面活性剂 纳米铁/炭 NO-3-N 地下水 

分 类 号：X523[环境科学与工程—环境工程]