活性炭负载纳米零价铁去除水溶液中U(Ⅵ)的研究  

Removal of U(Ⅵ) from Aqueous Solution Using Nanoscale Zero-valent Iron Supported on Activated Carbon

作　　者：刘大前 刘峙嵘[1,2] 王长福[2] 赖毅[2] 黄新[2] 

机构地区：[1]东华理工大学省部共建核资源与环境国家重点实验室培育基地,南昌330013 [2]东华理工大学核工程与地球物理学院,南昌330013

出　　处：《人工晶体学报》2016年第5期1328-1334,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(11375043);江西省科技支撑计划(20151BBG70011);省部共建核资源与环境国家重点实验室培育基地自主基金项目(Z1504)

摘　　要：采用Na BH4还原Fe2+制备活性炭负载纳米零价铁,以去除水溶液中铀酰离子,使用X射线衍射(XRD)对材料进行了表征,考察了活性炭负载纳米零价铁投加量、溶液p H值、反应温度和吸附时间对铀去除效果的影响。分别用动力学和吸附等温模型对吸附数据进行了分析。结果表明:XRD分析活性炭负载纳米零价铁负载的颗粒大部分为纳米零价铁,表面有一层铁氧化物(Fe OOH)生成。活性炭负载纳米零价铁对U(VI)具有很好的去除效果,当投加量为0.5 g/L、U(VI)初始质量浓度为250 mg/L、p H=5、温度为35℃、时间为60 min时,U(VI)去除率为98.52%,吸附量为492.6 mg/g。吸附过程符合准二级动力学模型和Freundlich吸附等温模型,所制备的吸附剂有望解决含铀废水难以有效处理等问题。Nanoscale zero-valent iron supported on activated carbon was synthesized in aqueous solutions by the reduction of Fe2 ＋with Na BH4.The X-ray radiation diffraction（XRD） was used to characterize the nanoscale zero-valent iron supported on activated carbon.The effects of dosages,p H value of solution,temperature and absorption time removal of U（VI） were investigated by nanoscale zero-valent iron supported on activated carbon.The adsorption kinetics and adsorption isotherms models were used to analyse adsorption datas.The results show that：XRD analyze most particles on nanoscale zero-valent iron supported on activated carbon were nanoscale zero-valent iron,and iron oxide（Fe OOH） is generated on the surface of zero-valent iron.Nanoscale zero-valent iron supported on activated carbon had very good removal effect on U（VI）,and when the dosage was 0.5 g/L,the initial concentration of U（VI） was 250 mg/L,p H value of solution was 5,the temperature was 35℃,the contact time was 60 min,the removal rate and adsorption capacity reached 98.52% and 492.6 mg/g respectively.The adsorption process of U（VI） onto nanoscale zero-valent iron supported on activated carbon was in line with the pseudo second-order kinetic model and Freundlich isotherm model.The prepared adsorbent is promising to solve the problem that uranium-contained wasted water is difficult to handle efficiently.

关 键 词：活性炭负载纳米零价铁 铀 吸附 吸附动力学 

分 类 号：X703.1[环境科学与工程—环境工程]