采用红背桂叶提取液,制备纳米铁(EL-FeNPs),用于去除水体中的铀离子[U(Ⅵ)],并对绿色合成的EL-FeNPs去除U(Ⅵ)反应前后的微观结构进行表征和分析,观察其反应前后的形态结构。考察了EL-FeNPs的投加量、pH、U(Ⅵ)溶液的初始浓度、反应温度及反应时间等因素对EL-FeNPs去除U(Ⅵ)的影响。研究结果表明:EL-FeNPs呈球状,且均匀分布,其粒径25～45nm。在30℃,pH=6,EL-FeNPs用量5g/L,U(Ⅵ)初始浓度10mg/L,反应时间100min条件下,EL-FeNPs对U(Ⅵ)的去除率为89.64%。
Iron-based nanoparticles(EL-FeNPs) were synthesized by the leaf of excoecaria cochinchensis used to remove U(Ⅵ) in aqueous solution.EL-FeNPs were characterized by SEM,XRD,EDS and FT-IR before and after the reaction.The effects of the experimental conditions,such as pH,the dosage of EL-FeNPs,the initial concentration of U(Ⅵ),the reaction temperature and the reaction time were investigated.The results showed that EL-FeNPs were spherical and uniformly dispersed,the size of EL-FeNPs was 25～45nm.The optimum removal conditions were as follows:Initial U(Ⅵ) concentration of 10mg/L,temperature of 30℃,reaction time of 100min,pH 6,dosing ratio of EL-FeNPs/U(Ⅵ) of 5g/L.The removal of U(Ⅵ) using EL-FeNPs were 89.64%.
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基金资助
国家自然科学基金青年基金项目(51304122);南华大学“青年英才”人才支持计划资助项目(南华政发[2014]49号)
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