Reduction of Nitrate in Groundwater with Modified Iron Nanoparticles
Nitrate reduction using laboratory synthesized Fe/Ni bimetallic nanoparticles was discussed. Nanoparticles were characterized by TEM-EDS, SEM, XRD and BET techniques. Denitrification of 80 mg-N/L nitrate solutions was performed with various Ni contents (1.0, 5.0, 10 and 20％) nanosized Fe/Ni particles compared with monometallic nano-scale Fe0.The introduction of Ni enhances the reduction rate remarkably and 5.0％ Ni loading shows the highest reactivity, for which nitrate was removed completely in 40 min when iron concentration was 1.5 g/L. Different from iron powder, Fe/Ni nanoparticles behaved the largest reaction rate under the condition of neutral solution pH without pH control. After slowly ageing 22 h, the reactivity of freshly prepared nanoscale Fe/Ni particles decreased about 10 times, but with the followed 44 h ageing, little decreasing of reactivity was observed which is equivalent to freshly synthesized nano-Fe0.The effects of initial nitrate concentration and the reduction kinetics were also investigated. For Fe/Ni bimetallic nanoparticles, about 90％ nitrate was transformed to ammonium, and nitrite was detected as intermediate product.
Nitrate Fe/Ni Nanoparticle Denitrification
Tielong Li Lili Sun Aihong Guo Shuima Wang An Yi Zongming Xiu Zhaohui Jin
College of Environmental Science and Engineering, Nankai University Tianjin, China Tianjin Key Labor College of Environmental Science and Engineering, Nankai University Tianjin, China College of Resources and Environment, Hebei Polytechnic University, Tangshan 063009
国际会议
上海
英文
2902-2905
2008-05-16（万方平台首次上网日期，不代表论文的发表时间）