摘要
实验室条件下,液相还原法FeSO4.7H2O和KBH4反应制备纳米铁,用XRD、TEM对其性能进行表征,结果表明该纳米铁平均粒径为50 nm,主要成分为α-Fe0。实验室进一步制备植物油改性纳米铁,TEM表明油膜均匀包覆在纳米铁颗粒表面,且纳米铁粒子分布均匀,分散较好。厌氧条件下,纳米铁与硝基苯反应,研究纳米铁和植物油改性纳米铁对硝基苯的降解性能,以及不同初始铁投加量、植物油质量分数、初始pH对硝基苯降解的影响。研究表明,纳米铁和植物油改性纳米铁均对硝基苯有较强的降解能力,理论摩尔比下,1 h内纳米铁和改性纳米铁对硝基苯的降解率达99.85%和56.74%;油膜质量分数为1%和2%的改性纳米铁降解硝基苯效果较好;随着初始纳米铁投加量的增加,硝基苯的降解越快;初始pH对改性纳米铁降解硝基苯有一定影响,酸性条件有利于改性纳米铁降解硝基苯。
Nanoscale zero-valent iron （ZVI） is prepared in the laboratory by liquid phase reducing method using KBH4 and FeSOa·7H20. Then the ZVI is modified by vegetable oil, so vegetable oil modified zero-valent iron is prepared. XRD and TEM shows that the average particle size of ZVI prepared is 50 nm and its main component is u-Fe0. As to vegetable oil modified ZVI is successfully surrounded by the oil membrane, and it is well-dispersed, less aggregation of vegetable oil modified ZVI is observed. The experiments are conducted in anaerobic conditions, zero-valent iron and nitrobenzene is reacted to investigate the removal ability of ZVI and modified ZVI, the influence of different oil mass fraction, initial iron mass, initial pH. Results indicated that both ZVI and modified ZVI have the ability to degrade nitrobenzene, in 1 hour, degradation rate of ZVI and oil-modified ZVI has reached to 99.85% and 56.74% respectively; the optimized oil mass fraction tended to be 1% and 2%; As the increase of initial iron mass, the degradation yielded to be faster and more completely; the initial pH tended to have some influence on the degradation, the acidic initial conditions is beneficial to the degradation.
出处
《生态环境学报》
CSCD
北大核心
2013年第6期1048-1052,共5页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(41272253)
环保公益性行业科研专项项目(2011467010)
关键词
纳米铁
乳化油
原位修复
硝基苯
zero-valent iron
vegetable oil
in-situ remediation
nitrobenzene
