摘要
以液相还原法制备纳米零价铁,将其负载于石墨表面制备负载型纳米零价铁复合材料(G-nZVI),并用来去除溶液中的U(Ⅵ),考察初始溶液的pH、反应温度、反应时间、U(Ⅵ)的初始浓度以及固液比等因素对复合材料(G-nZVI)去除U(Ⅵ)影响。用扫描电镜(SEM)和X射线衍射(XRD)技术对反应前后的材料进行表征,分析其去除U(Ⅵ)的机理。结果表明:纳米零价铁颗粒分散在石墨粉的表面,没有产生团聚。反应后溶液中主要生成UO2和U(Ⅳ)氢氧化物沉淀。石墨负载型纳米零价铁对U(Ⅵ)有很好的去除效果,在pH为4.0,温度为30℃,反应时间为60 min,固液比为0.25 g/L,初始U(Ⅵ)浓度为10 mg/L条件下,U(Ⅵ)的去除率和吸附容量分别达到99.67%和43.2 mg/g,说明该复合材料(G-nZVI)在含铀放射性废水的处理与环境修复中具有潜在的应用价值。
The nano-zero-valent iron was prepared by liquid phase reduction method and loaded on the surface of graphite powder to form graphite-loaded nano-zero-valent iron composite(G-nZVI).The materials were used to remove U(Ⅵ)from the solution.The effects of initial solution pH,reaction temperature and time,initial concentration of U(Ⅵ)and solid-liquid ratio on the removal of U(Ⅵ)from composite materials(G-nZVI)were investigated.The composites before and after the reaction were characterized by scanning electron microscopy(SEM)and X-ray diffraction(XRD)to analyze the mechanism of U(Ⅵ)removal.The research results show that nano-zero-valent iron particles are dispersed on the surface of graphite powder and there is no agglomeration phenomenon.Mainly components are UO2 and U(Ⅳ)hydroxide precipitate in the solution after the reaction.Graphite-loaded nano-zero-valent iron has a good adsorption effect on U(Ⅵ).The removal rate and adsorption capacity of U(Ⅵ)reach 99.67%and 43.2 mg/g,respectively,when the conditions of pH value is 4.0,temperature is 30℃,reaction time is 60 min,solid-liquid ratio is 0.25 g/L,initial U(Ⅵ)concentration is 10 mg/L.The result shows that the composite material(G-nZVI)has potential application value in the treatment and environmental restoration of uranium-containing radioactive wastewater.
作者
刘学
李小燕
陈玉洁
桑伟璇
陈蓉
LIU Xue;LI Xiao-yan;CHEN Yu-jie;SANG Wei-xuan;CHEN Rong(State Key Laboratory Breeding Base of Nuclear Resources and Environment,East Chain University of Technology,Jiangxi 330013,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2020年第8期1967-1973,共7页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(41761090,11465002)
江西省自然科学基金资助项目(20171ACB2021)
核资源与环境国家重点实验室资助项目(NRE1608)。
关键词
石墨
纳米零价铁
负载
铀
去除
graphite powder
nano-zero-valent iron
uranium
loading
removal
