碳包覆磁性Fe_3O_4的制备及其对废水中铀的吸附行为研究
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摘要
研究了以磁性纳米Fe_3O_4为原料,利用水热反应法制备碳包覆磁性Fe_3O_4颗粒复合基体(Fe_3O_4@HTC),然后用氢氧化钠改性得到Fe_3O_4@HTC-NaOH。考察了溶液pH、铀初始质量浓度、吸附时间和温度对Fe_3O_4@HTC-NaOH吸附铀的影响。结果表明:在溶液中铀质量浓度100 mg/L、溶液pH=5.5、室温条件下吸附200 min后,Fe_3O_4@HTC-NaOH对铀的最大吸附量为456.67 mg/g;吸附过程中自发吸热,反应符合准二级动力学模型和Langmuir吸附等温模型;经过5次重复使用,Fe_3O_4@HTC-NaOH对铀的吸附量仍高达初始吸附量的77.43%,可重复使用。
Carbon-coated magnetic Fe_3O_4 particle composite(Fe_3O_4@HTC) was synthesized by hydrothermal reaction with magnetic nano-ferric oxide as raw material.The modification of Fe_3O_4@HTC by NaOH then adsorption of uranium(Ⅵ) from waste water was researched.The effects of pH,initial concentration of uranium(Ⅵ),adsorption time and temperature on the adsorption capacity of Fe_3O_4@HTC-NaOH for uranium(Ⅵ) were investigated.The results show that the maximum adsorption capacity of 456.67 mg/g can be achieved within 200 min under pH of uranium solution of 5.5.The kinetic studies show that the adsorption process can be well simulated by pseudo second-order rate equation.The thermodynamics analysis results indicate that the adsorption process can be described by Langmuir adsorption isotherm equation,and the adsorption reaction is a spontaneous endothermic.During dynamic absorption-elution experiments,good reusability and high desorption efficiency of Fe_3O_4@HTC-NaOH for uranium(Ⅵ) are obtained with the fifth utilization of 77.4%.
Carbon-coated magnetic Fe_3O_4 particle composite(Fe_3O_4@HTC) was synthesized by hydrothermal reaction with magnetic nano-ferric oxide as raw material.The modification of Fe_3O_4@HTC by NaOH then adsorption of uranium(Ⅵ) from waste water was researched.The effects of pH,initial concentration of uranium(Ⅵ),adsorption time and temperature on the adsorption capacity of Fe_3O_4@HTC-NaOH for uranium(Ⅵ) were investigated.The results show that the maximum adsorption capacity of 456.67 mg/g can be achieved within 200 min under pH of uranium solution of 5.5.The kinetic studies show that the adsorption process can be well simulated by pseudo second-order rate equation.The thermodynamics analysis results indicate that the adsorption process can be described by Langmuir adsorption isotherm equation,and the adsorption reaction is a spontaneous endothermic.During dynamic absorption-elution experiments,good reusability and high desorption efficiency of Fe_3O_4@HTC-NaOH for uranium(Ⅵ) are obtained with the fifth utilization of 77.4%.
引文
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[2] 尚兵,耿秀生.浅谈贫铀弹对环境的污染和人体的危害[J].中国预防医学杂志,2001(3):70-73.
[3] 罗明标,刘淑娟,余亨华.氢氧化镁处理含铀放射性废水的研究[J].水处理技术,2002,28(5):274-277.
[4] 郭栋清,李静,张利波,等.核工业含铀废水处理技术进展[J].工业水处理,2019,39(1):14-20.
[5] 张帆,李菁,谭建华,等.吸附法处理重金属废水的研究进展[J].化工进展,2013,32(11):2749-2756.
[6] 彭国文.新型功能化吸附剂的制备及其吸附铀的试验研究[D].长沙:中南大学,2014.
[7] 郑超,刘珊珊,刘伟,等.磁性吸附材料对重金属离子吸附的研究进展[J].山东工业技术,2019(5):40.
[8] 刘红娟,谢水波,张希晨,等.氧化石墨烯复合材料吸附铀的研究进展[J].材料工程,2018,46(5):11-21.
[9] 熊骁,王清良,李乾,等.Fe(OH)3胶体对铀的吸附行为[J].原子能科学技术,2016,50(1):39-45.
[10] 王胜林,王强斌,古宏晨,等.磁性微球的生物医学应用研究进展[J].化学世界,2001,42(7):384-387.
[11] 任欢鱼,刘蕾,刘勇健.磁流体的制备与性质研究[J].中国粉体技术,2003,9(1):21-23.
[12] WANG H,LIU Y G,ZENG G M,et al.Grafting of β-cyclodextrin to magnetic graphene oxide viaethylenediamine and application for Cr(Ⅵ) removal[J].Carbohydrate Polymers,2014,113:166-173.
[13] LIZ J,HUANG Z W,GUO W L,et al.Enhanced photocatalytic removal of uranium(Ⅵ) from aqueous solution by magnetic TiO2/Fe3O4 and its graphenecomposite[J].Environmental Science & Technology,2017,51(10):5666-5674.
[14] 李瑞雪.新型磁性纳米功能材料的制备与性能研究[D].广州:华南理工大学,2010.
[15] 刘晓龙,韦宗慧,冯超,等.磁流体制备及性质研究[J].物理实验,2012,32(8):6-10.
[16] 丁明,曾桓兴.中和沉淀法 Fe3O4的生成研究[J].无机材料学报,1998,13(4):619-624.
[17] ZOU Y D,WANG X X,AI Y J,et al.β-cyclodextrin modified graphitic carbon nitride for the removal ofpollutants from aqueous solution:experimental and theoretical calculation study[J].Journal of Materials Chemistry:A,2016,4:14170-14179.
[18] SUN Y B,WU Z Y,WANG X X,et al.Macroscopic and microscopic investigation of U(Ⅵ) and Eu(Ⅲ) adsorption on carbonaceous nanofibers[J].Environmental Science &Technology,2016,50:4459-4467.
[19] ZOU Y D,CAO X H,LUO X P,et al.Recycle of U(Ⅵ) from aqueous solution by situ phosphorylation mesoporous carbon[J].Journal of Radioanalytical and Nuclear Chemistry,2015,306:515-525.
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[24] 邢拥国,张志宾,花榕,等.聚苯胺/TiO2复合材料对U(Ⅵ)吸附性能的研究[J].原子能科学技术,2018,52(7):1222-1230.