Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 274, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2021.119056
Keywords
Electroactive composite membrane; Nickel hexacyanoferrate nanoparticles; Coal-based tubular carbon membrane; Ultrahigh removal efficiency; High ion selectivity; Radioactive cesium removal
Categories
Funding
- National Natural Science Foundation of China [21878206]
- Science and Technology Innovation Project for Excellent Talents of Shanxi Province [201805D211040]
- National Key R&D Program of China [2017YFE0129200]
- Fund Program for the Scientific Activities of Selected Returned Overseas Professionals of Shanxi Province in 2019
- JSPS KAKENHI, Japan [19K12395]
- Grants-in-Aid for Scientific Research [19K12395] Funding Source: KAKEN
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The electroactive composite membrane with nickel hexacyanoferrate (NiHCF) nanoparticles deposited on coal-based tubular carbon membrane (CTCM) surface and inner wall showed rapid and selective separation of Cs+ from wastewater. The composite membrane demonstrated extremely high removal rate and Cs+ selectivity, even in solutions with high coexisting ion concentrations. This can be attributed to the dispersion of NiHCF nanoparticles with high selectivity to Cs+ in the CTCM tube, which enhances mass transfer rate.
Radioactive cesium (137Cs) ions exhibit high-energy gamma radiation and long half-life. When they enter water body, serious environmental problems and damage to the human body are always generated. Herein, an electroactive composite membrane was facilely prepared by uniformly deposition of nickel hexacyanoferrate (NiHCF) nanoparticles on the surface and inner wall of coal-based tubular carbon membrane (CTCM) for rapid and selective separation of Cs+ from wastewater. This NiHCF incorporated CTCM tube exhibited an extremely high removal rate (over 99.99%) over a long period. Meanwhile, it also demonstrated extreme Cs+ selectivities even in the solutions with high coexisting ion concentrations (e.g., Cs+:Na+ = 1:99, Cs+:K+ = 1:99). The rapid and selective Cs+ uptake/release should be attributed to the better dispersion of NiHCF nanoparticles with high selectivity to Cs+ in the CTCM tube, which reduced the mass transfer distance, increased fluid turbulence and accelerated mass transfer rate. It is expected that such a NiHCF incorporated CTCM tube could be a promising alternative of conventional materials for the separating of radioactive Cs+ ions.
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