Synthesis of nanoiron by microemulsion with Span/Tween as mixed surfactants for reduction of nitrate in water  

作　　者：ZHANG Yunxia LI Tielong JIN Zhaohui WANG Wei WANG Shuaima 

机构地区：[1]College of Environmental Science and Engineering,Nankai University,Tianjin 300071,China

出　　处：《Frontiers of Environmental Science & Engineering》2007年第4期466-470,共5页环境科学与工程前沿（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.20477019);the Tianjin Natural Science Foundation of China(Grant No.07JCZDJC01800).

摘　　要：Denitrification of nitrate in groundwater using iron nanoparticles has received increasing interest in recent years.In order to fabricate iron nanoparticles with homoge-neously spherical shape and narrow size distribution,a simple and“green”method was developed to synthesize iron nano-particles.The conventional microemulsion methods were modified by applying Span 80 and Tween 60 as mixed sur-factants.The maximum content of water in the Water-in-oil(W/O)microemulsion and its appropriate forming conditions were found,and then the microemulsion system consisting of saturated Fe^(2+)solution was used to synthesizeα-Fe ultrafine particles by redox reaction.The nanoparticles were characterized by using powder X-ray diffraction(XRD)and transmission electron microscopy(TEM).The results show that the average diameter of the particle is about 80-90 nm.The chemical activity of the obtained iron nanoparticles was studied by the denitrification experiment of nitrate.The results show that under the experimental conditions,iron removed most of the 80 mg/L nitrate within 30 min.The mass balance of nitrate reduction with nanoscale Fe indicates that endproducts are mainly ammonia.Two possible reaction pathways for nitrate reduction by nanoscale iron particles have been proposed in this work.

关 键 词：mixed surfactants MICROEMULSION iron nanoparticles NITRATE 

分 类 号：O62[理学—有机化学]