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| Study on Removal of U(Ⅵ) from Water Bodies by STAC Modified Bentonite |
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Received:September 01, 2021
Revised:September 06, 2021
Accepted:September 10, 2021
Published Online:December 17, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2022.01.019 |
| KeyWord:octadecyl trimethyl ammonium chloride (STAC); bentonite; uranium; adsorption; mechanism |
| Author | Institution |
| ZHANG Yi-shuo |
东华理工大学 |
| Zhou Zhong-kui |
东华理工大学水资源与环境工程学院 |
| WANG Si-yu |
东华理工大学 |
| WANG Shi-jun |
东华理工大学水资源与环境工程学院 |
| SUN Zhan-xue |
东华理工大学 |
| HU Zhong-qiang |
东华理工大学水资源与环境工程学院 |
| YUAN Jia-mao |
东华理工大学水资源与环境工程学院 |
| FAN Xiao-lei |
东华理工大学水资源与环境工程学院 |
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| Abstract: |
| 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. |
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