Grantee Research Project Results
Final Report: Mesoporous Adsorbents for Perfluorinated Compounds
EPA Grant Number: SU839448Title: Mesoporous Adsorbents for Perfluorinated Compounds
Investigators: Vasiliev, Aleksey , Mohseni, Ray
Institution: East Tennessee State University
EPA Project Officer: Page, Angela
Phase: I
Project Period: December 1, 2018 through November 30, 2019 (Extended to August 30, 2020)
Project Amount: $15,000
RFA: P3 Awards: A National Student Design Competition Focusing on People, Prosperity and the Planet (2018) RFA Text | Recipients Lists
Research Category: P3 Challenge Area - Safe and Sustainable Water Resources , P3 Awards
Objective:
In this project we plan to develop porous adsorbents for cleanup of water contaminated by perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS). Most of existing technologies are expensive and insufficiently efficient. The proposed materials with high adsorption capacity (up to 6.8 mmol/g) will be used for reversible adsorption of these contaminants from drinking water or wastewater. The innovative aspect of the project is the use of bridged polysilsesquioxanes combining high structural stability with high concentration of surface amino-groups serving as adsorption sites. The project is based on the hypothesis that porous hybrid materials containing bridged amines can adsorb PFOA and PFOS from contaminated water with significantly enhanced adsorption capacity.
Summary/Accomplishments (Outputs/Outcomes):
Effective adsorbents for polyfluorinated compounds (PFCs) were obtained and successfully tested in adsorption of perfluorooctanoic and perfluorooctanesulfonic acids. Bridged silsesquioxanes containing secondary and tertiary amino groups were synthesized by sol-gel condensation of bis[3-(trimethoxysilyl)propyl]amine and N-methyl-3,3’ bis(trimethoxysilyl)- dipropylamine in acidic media in the presence of surfactants. Obtained materials were mesoporous with high BET surface area. They combine high structural stability with high concentration of surface amino groups serving as adsorption sites. Batch adsorption tests demonstrated their high adsorption capacity on PFCs: in some experiments it reached up to 88% of the adsorbent weight. Adsorption of PFCs changed the surfaces of the adsorbent nanoparticles from hydrophilic to hydrophobic thus providing their agglomeration and floatability. Column tests showed fast adsorption of PFCs even at high concentrations and high flow rates. Obtained results can be used in the development of an effective filtration device for clean-up of water contaminated by PFCs.
Conclusions:
- Novel mesoporous materials with high concentration of basic adsorption sites were synthesized by sol-gel method using bridged bis-trimethoxysilanes.
- Obtained materials with particle size up to 300 nm had high BET surface area (up to 189 m2/g) that provides easy access of adsorbing molecules to the adsorption sites.
- The materials demonstrated high adsorption capacity to PFOA and PFOS. The highest amount of adsorbed polyfluorinated compounds was about 90% of the mass of adsorbent.
- Adsorbed acids are bonded to the surface strongly and remain on the adsorbents at heating up to 180 °C.
- After adsorption, the materials agglomerated and became hydrophobic that makes easy its separation from water.
- Regeneration study confirmed a possibility of recycling the adsorbent without loss of its adsorption capacity.
In summary, proposed adsorbents for treatment of PFOA/PFOS-contaminated waste waters have the following advantages over existing materials: they are easy to prepare, easy to use, and easy to recycle.
References:
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Journal Articles on this Report : 1 Displayed | Download in RIS Format
Other project views: | All 2 publications | 1 publications in selected types | All 1 journal articles |
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Kuvayskaya A, Lotsi B, Mohseni R, Vasiliev A. Mesoporous adsorbents for perfluorinated compounds. Microporous and Mesoporous Materials 2020; 305:110374. |
SU839448 (Final) |
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Progress and Final Reports:
Original AbstractThe perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.