Study on the regularity of Se(IV) adsorption by bentonite from different regions
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Qifeng Jiang
and
Rong Hua
Abstract
Bentonite exhibits obvious geological characteristics in different areas, and its chemical composition varies. To investigate the impact of these variations on the adsorption of Se(IV), the chemical structures and elemental contents of three types of bentonites were characterized using FTIR and XRF. By conducting a series of experiments and fitting the results with the kinetic adsorption model and the isothermal adsorption model, it was discovered that bentonite exhibits diverse adsorption modes for Se(IV). In acidic environments, the adsorption mode primarily involves forming an outer-sphere complex, whereas in neutral and alkaline environments, the primary mode is to form an inner-sphere complex. Zhi-Shin bentonite, which has low alumina content and high iron oxide content, demonstrates poor adsorption effectiveness on Se(IV) at low temperatures (less than 45 °C), but exhibits good adsorption effectiveness at high temperatures (more than 50 °C). Conversely, bentonite with high alumina content and low iron oxide content demonstrates the opposite effect. Furthermore, for bentonite with high iron oxide content, Se(IV) will form more inner-sphere complexes with iron oxide, and the adsorption behavior is not easily affected by changes in ionic strength and pH.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This work was funded by Nuclear energy development project (technology for the mining and metallurgy of associated uranium resources - on the demonstration of uranium co training in Bayan Ura, Inner Mongolia) and China Uranium Industry Co, Ltd. - The Foundation of State Key Laboratory of Nuclear Resources and Environment Joint Innovation Fund Project (2022NRE-LH-15); and Natural Science Fund project in Jiangxi province: Synthesis of irradiated modified triphenylphosphine polymer and study on the supernormal separation and enrichment behavior of rhenium (Project number: 20232ACB203014).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Articles in the same Issue
- Frontmatter
- Heat transfer and pressure drop analysis of a microchannel heat sink using nanofluids for energy applications
- Study on the regularity of Se(IV) adsorption by bentonite from different regions
- Design study of small modular gas-cooled fast reactor employing modified CANDLE burnup with radial direction shuffling scheme
- Ecological interface design and evaluation for feedwater dearating system in NPPs
- Comparative analysis of fuel burnup calculations of fourth-generation European fast reactors
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Articles in the same Issue
- Frontmatter
- Heat transfer and pressure drop analysis of a microchannel heat sink using nanofluids for energy applications
- Study on the regularity of Se(IV) adsorption by bentonite from different regions
- Design study of small modular gas-cooled fast reactor employing modified CANDLE burnup with radial direction shuffling scheme
- Ecological interface design and evaluation for feedwater dearating system in NPPs
- Comparative analysis of fuel burnup calculations of fourth-generation European fast reactors
- Unfiltered air inleakage analysis of the control room envelope of Kuosheng nuclear power plant
- Calendar of events
