摘要
为探究膨润土对含铀废水的吸附性能,对膨润土进行钠化预改性,然后用十八烷基三甲基氯化铵(STAC)对钠化膨润土进行有机改性,探究模拟含铀废水pH、固液比、反应时间、反应温度、初始浓度对STAC有机改性膨润土吸附U(Ⅵ)的影响,并探究了膨润土吸附动力学和吸附等温曲线。结果表明,当pH=7.04、固液比4.0 g/L、反应时间480 min、反应温度318.15 K、含铀废水初始浓度<10 mg/L时,该吸附材料处理含铀模拟废水的效果最佳,最高吸附率达到99.52%。准二级动力学方程和Langmuir等温吸附模型更适于阐明STAC有机改性膨润土吸附U(Ⅵ)的过程,反应主要是化学吸附和单层吸附。Langmuir拟合吸附容量最高为198.73 mg/g。
In order to explore adsorption performance of bentonite on uranium-containing wastewater,bentonite was pre-modified by sodium,and then organically modified by octadecyl trimethyl ammonium chloride(STAC).Effects of pH value of simulated uranium-containing wastewater,ratio of solid to liquid,reaction time and temperature,and initial concentration of simulated uranium-containing wastewater on adsorption of U(Ⅵ)by STAC organic modified bentonite were investigated,and adsorption kinetics and adsorption isothermal curve of bentonite were explored.The results show that adsorption material has the best effect on treatment of uranium-containing simulated wastewater and the maximum adsorption rate is 99.52%under the conditions including pH value of 7.04,ratio of solid to liquid of 4.0 g/L,reaction time of 480 min,reaction temperature of 318.15 K,and initial concentration of uranium-containing wastewater of<10 mg/L.Pseudo-second-order kinetic equation and Langmuir isothermal adsorption model are more suitable to clarify adsorption process of U(Ⅵ)on STAC organic modified bentonite,indicating that the reaction is dominated by chemical adsorption and is monolayer adsorption.The maximum adsorption capacity of Langmuir fitting is about 198.73 mg/g.
作者
张益硕
周仲魁
王丝雨
王世俊
孙占学
胡中强
袁嘉懋
樊小磊
ZHANG Yi-shuo;ZHOU Zhong-kui;WANG Si-yu;WANG Shi-jun;SUN Zhan-xue;HU Zhong-qiang;YUAN Jia-mao;FAN Xiao-lei(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Water Resource and Environmental Engineering,East China University of Technology,Nanchang 330013,China;Nuclear Industry Eastern China Construction Engineering Group Co..Ltd.,Nanchang 330013,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2022年第1期127-132,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
国家自然科学基金资助项目(41662024)。
