Adsorption behavior of U(VI) and mechanism analysis by organically modified vermiculite

被引：0

作者：

机构：

[1] School of Nuclear Science and Technology, University of South China, Hengyang

[2] School of Chemistry and Chemical Engineering, University of South China, Hengyang

来源：

Xia, Liang-Shu | 1600年 / Atomic Energy Press卷 / 48期

关键词：

Adsorption; Kinetics; Mechanism; Modified vermiculite; Thermodynamics; Uranium;

D O I：

10.7538/yzk.2014.48.12.2187

中图分类号：

学科分类号：

摘要：

The adsorption behavior of U(VI) on modified vermiculite by HDTMA·Br was studied with static experiments. The effects of the amount of adsorbent, pH, initial mass concentration of uranium and time on the removal rate of uranium were investigated. The unit mass of adsorption process was analyzed in thermodynamics and kinetics, and the adsorption mechanism was analyzed with FT-IR and SEM. The results indicate that the removal rate of uranium can increase with the increase of adsorbent amount and time, and the decrease of initial mass concentration of uranium. The adsorption equilibrium tends to be achieved in 120 min, and solution using flocculant and modified vermiculite can be improved. The adsorption of uranium by organically modified vermiculite is a complex process, so Langmuir monolayer adsorption theory and Freundlich adsorption theory cannot fully explain the adsorption process. The removal mechanism of uranium by using modified vermiculite fits Langmuir adsorption law, and is in line with quasi-second order kinetic equation. It is confirmed by FT-IR that -OH and Si-O play an important role in the adsorption of uranium. SEM shows that the adsorption of uranium using modified vermiculite causes the structure change. ©, 2014, Atomic Energy Press. All right reserved.

引用

页码：2187 / 2194

页数：7

共 17 条

[1]

Matthes W., Kahr G., Sorption of organic compounds by Al and Zr-hydroxy-intercalated and pillared bentonite, Clays and Clay Minerals, 48, 6, pp. 593-602, (2000)

[2]

Yu X., Wu X., Lu P., Et al., Study on kinetics of Cu2+ adsorption on vermiculite in liquid/solid systems, Natural Science Journal of Xiangtan University, 29, 2, pp. 80-86, (2007)

[3]

Wang F., Liang C., Du L., Et al., Characteristics of adsorption of Cu and Zn in natural vermiculite and zeolite, Journal of Shenyang Agricultural University, 38, 4, pp. 531-534, (2007)

[4]

Li H., Tan G., Peng T., Study on the dynamic adsorption of vermiculite to cadmium, Chemical Research and Application, 12, 6, pp. 661-663, (2000)

[5]

Wang W., Wu P., Preparation of organic vermiculite and application for adsorption of 2, 4-dichlorophenol from aqueous solutions, Journal of Functional Materials, 44, 6, pp. 1-5, (2013)

[6]

Nie F., Wu X., Hu Y., NH4-N removal capacity of vermiculite stuffing in constructed wetland, Urban Environment & Urban Ecology, 16, 6, pp. 280-282, (2003)

[7]

Ma X., Liu X., Liu X., Preliminary study on adsorption performance of modified vermiculite, Energy Environmental Protection, 18, 5, pp. 46-48, (2004)

[8]

Wu P., Research on the structural characteristic of HDTMA-vermiculite, Earth Science Frontiers, 8, 2, pp. 321-326, (2001)

[9]

Wang X., Xia L., Tan K., Et al., Studies on adsorption of uranium(VI) from aqueous solution by wheat straw, Environmental Progress & Sustainable Energy, 31, 4, pp. 566-576, (2012)

[10]

Xia L., Zhang X., Huang X., Synergistic treatment of uranium-containing wastewater by attapulgite and FeSO4, Atomic Energy Science and Technology, 47, 11, pp. 1945-1950, (2013)

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