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Electro-adsorption of Cs(I) ions from aqueous solution by capacitive deionization using ACC/MoO3 composite electrode
Xiaojing Liu1, Jinling Wu2, Jianlong Wang2
1Institute of Agricultural Resource and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, China.
The Science of the Total Environment
|December 31, 2022
Summary
A new composite electrode made of activated carbon cloth and molybdenum trioxide (ACC/MoO3) effectively removes cesium ions (Cs+) from radioactive waste using capacitive deionization. This material shows promise for advanced waste treatment applications.
Area of Science:
- Environmental Science
- Materials Science
- Electrochemistry
Background:
- Cesium ion (Cs+) separation from radioactive waste is critical but challenging.
- Capacitive deionization (CDI) offers a promising method for ion separation.
Purpose of the Study:
- To develop and evaluate an ACC/MoO3 composite electrode for Cs+ removal via CDI.
- To characterize the electrode material and understand the Cs+ adsorption mechanism.
Main Methods:
- Fabrication and characterization of ACC/MoO3 composite electrode (SEM-EDS, FTIR, XPS).
- Capacitive deionization experiments to assess Cs+ removal efficiency.
- Analysis of adsorption kinetics, isotherms, and mass transfer.
Main Results:
- The ACC/MoO3 composite electrode exhibits a mesoporous structure with high specific surface area (170.4 m2 g-1) and capacitance (76.3 F g-1).
- Cs+ removal efficiency increased with voltage and decreased with concentration, reaching 44.7% at 1.2 V and 5 mg L-1 Cs+.
- Adsorption followed multi-layer adsorption kinetics, with adsorption to active sites (AAS) as the rate-limiting step.
Conclusions:
- The ACC/MoO3 composite electrode is a viable material for Cs+ separation from radioactive waste.
- CDI using this composite electrode demonstrates potential for efficient radioactive waste management.
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