摘要
以内蒙古阿拉善某地下水为水相背景,Fe 3 O 4@SiO 2-NH 2磁性复合纳米材料和阿拉善黏土岩为吸附剂,采用静态批量法进行U(Ⅵ)吸附实验,并通过吸附动力学模型和吸附等温模型对实验数据进行拟合,分析吸附机理,研究了磁性复合纳米材料和阿拉善黏土岩分别在不同条件下对U(Ⅵ)的吸附性能。结果表明,固液比为1∶200、温度为35℃、吸附平衡时间为2 h、pH为5的条件下,复合材料对U(Ⅵ)的吸附效果最佳,为73%左右,说明该材料在特定水相环境中对核素U(Ⅵ)也能表现出较好的吸附性能。阿拉善黏土岩对U(Ⅵ)的吸附研究发现:固液比为1∶200、温度为35℃、吸附平衡时间为24 h、pH为8的条件下对U(Ⅵ)的吸附率为35%左右。吸附实验表明:在特定水相环境中,制备的Fe 3 O 4@SiO 2-NH 2复合粒子比阿拉善黏土岩具有更好的吸附性能和更大的吸附容量。
Fe3O4@SiO2-NH2 magnetic nanoparticles,as a kind of composite material,have been invested in a large amount of research due to its excellent properties and potential application value in the treatment of high-concentration radioactive waste.Alashan,Inner Mongolia,serve as the water aqueous background,the adsorption properties of the composite nanomaterials and Alxa clay rocks on U(Ⅵ)under different conditions were studied to provide strong support for the application of composite magnetic particles.The effect of different factors on the adsorption of uranium(Ⅵ)was studied by using Fe3O4@SiO2-NH2 magnetic composite nanomaterials and Alashan claystone as raw material in static adsorption method.The mostly-known adsorption kinetics model and adsorption isotherm models were applied to the experimental data and analyzed the adsorption mechanism.The results showed that composite particles had the best adsorption effect on U(Ⅵ)at the conditions of solid-liquid ratio 1:200,adsorption equilibrium time 2 h,pH 5 and 35℃,which adsorption rate reached to 73%.The material also showed good adsorption performance in specific environment.The adsorption of U(Ⅵ)on Alxa clay rocks was founded that the adsorption rate was about 35%under the conditions of adsorption equilibrium time 24 h,solid-liquid ratio 1:200,temperature 35℃,pH 8.The adsorption results were in good agreement with the quasi-second-order kinetic model,and the adsorption mechanism involved chemisorption.The adsorption data for two types of adsorbent fitted well with the Freundich isotherm model.The adsorption experiments turned out that the Fe3O4@SiO2-NH 2 composite particles were successfully synthesized and used for the extraction of U(Ⅵ)from large volume of water solution even though in the specific environment,which had a much adsorptive property and larger adsorption capacity than Alxa claystone.The parameters obtained in this experiment provided a vital basis for the establishment of the adsorption model of U(Ⅵ)on specific adsorbent in a certain a
作者
王彦惠
冷阳春
成建峰
卫纯纯
赵玉婷
李东瑞
WANG Yanhui;LENG Yangchun;CHENG Jianfeng;WEI Chunchun;ZHAO Yuting;LI Dongrui(College of nuclear technology and automation engineering,chengdu university of technology,Chengdu of Sichuan Prov.610000,China;College of National Defense Science and Technology,Southwest University of Science and Technology,Mianyang of Sichuan Prov.621010,China)
出处
《核科学与工程》
CAS
CSCD
北大核心
2020年第4期688-695,共8页
Nuclear Science and Engineering
基金
国家自然科学基金重点项目(No.41630646),国家自然科学青年基金(No.41603124)。
