活性炭负载纳米零价铁去除水溶液中U(Ⅵ)的研究
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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.
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.
引文
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[20]Li X L,Wu J J,Liao J L,et al.Adsorption and Desorption of Uranium(VI)in Aerated Zone Soil[J].Journal of Environmental Radioactivity,2013,115(1):143-150.
[2]景晨,李义连,徐佳丽,等.高岭土对铀的吸附试验研究[J].安全与环境工程,2014,21(1):73-76.
[3]Xu J L,Li Y L,Jing C,et al.Removal of Uranium from Aqueous Solution Using Montmorillonite-supported Nanoscale Zero-valent Iron[J].Journal of Radioanalytical and Nuclear Chemistry,2014,299(1):329-336.
[4]徐佳丽.蒙脱石负载纳米零价铁对水溶液中铀的去除研究[D].武汉:中国地质大学博士学位论文,2014.
[5]谢志英,肖化云,王光辉.交联壳聚糖对铀的吸附研究[J].环境工程学报,2010,4(8):1749-1752.
[6]王晓.麦秸处理含铀废水的研究[D].衡阳:南华大学硕士学位论文,2011.
[7]Yuan T G,Chen D Y.Experimental Study on the Treatment of Uranium-contaminated Mine Wastewater Using Zero-valent Iron Nanoparticles[J].Applied Mechanics Materials,2013,316-317:516-519.
[8]李小燕,刘义保,花明,等.纳米零价铁去除溶液中U(VI)的研究[J].核动力工程,2013,34(2):160-163.
[9]吴丽梅,吕国诚,廖立兵.活性炭负载纳米零价铁去除污水中六价铬的研究[J].矿物学报,2012,181-182.
[10]周娟娟,李战军.活性炭/纳米零价铁复合吸附剂的制备及对砷的去除应用[J].环境科学与管理,2012,37(10):106-108.
[11]杨麒,伍秀琼,钟宇,等.活性炭负载纳米零价铁去除溴酸盐的研究[J].湖南大学学报(自然科学版),2013,40(12):98-101.
[12]刘诺.负载纳米零价铁活性炭去除水中CAHs的可行性研究[D].上海:华东理工大学硕士学位论文,2013.
[13]王琼,陈维芳,潘玲,等.纳米零价铁/活性炭复合材料去除水中六氯苯的影响因素研究[J].水资源与水工程学报,2015,26(1):92-95.
[14]Richard A C,Thomas S.The Removal of Uranium onto Carbon-supported Nanoscale Zero-valent Iron Particles[J].Journal of Nanoparticle Research,2014,16:1-13.
[15]高芳,张卫民,郭亚丹,等.羟基磷灰石负载纳米零价铁去除水溶液中铀(VI)的研究[J].中国陶瓷,2015,51(8):10-14.
[16]袁土贵.纳米零价铁处理含铀废水的研究[D].广州:广州大学硕士学位论文,2013.
[17]Antonia L V,Reyes S A,Beatriz C,et al.Removal of Nitrate and Hexavalent Uranium from Groundwater by Sequential Treatment in Bioreactors Packed with Elemental Sulfur and Zero-valent Iron[J].Biotechnology Bioengineering,2010,107(6):933-942.
[18]Yan S,Hua B,Bao Z Y,et al.Uranium(VI)Reduction by Nanoscale Zerovalent Iron in Anoxic Batch Systems[J].Environmental Science&Technology,2010,44(20):7783-7789
[19]Harshala P,Shreeram J,Niyoti S,et al.Uranium Removal from Aqueous Solution by Coir Pith:Equilibrium and Kinetic Studies[J].Bioresource Technology,2005,96(11):1241-1248.
[20]Li X L,Wu J J,Liao J L,et al.Adsorption and Desorption of Uranium(VI)in Aerated Zone Soil[J].Journal of Environmental Radioactivity,2013,115(1):143-150.