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DOI: https://doi.org/10.4491/eer.2018.177
Immobilization of Prussian blue nanoparticles in acrylic acid-surface functionalized poly vinyl alcohol sponge for cesium adsorption
Hyobin Wi1, Sung-Won Kang2, and Yuhoon Hwang1
1Department of Environmental Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
2Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Republic of Korea
Corresponding Author: Yuhoon Hwang ,Tel: +82-2-970-6626, Fax: +82-2-971-5776, Email: yhhwang@seoultech.ac.kr
Received: May 21, 2018;  Accepted: July 12, 2018.
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ABSTRACT
Prussian blue (PB) is known to be an effective material for radioactive cesium adsorption, but its nano-range size make it difficult to be applied for contaminated water remediation. In this study, a simple and versatile approach to immobilize Prussian blue in the supporting matrix via surface functionalization was investigated. The commercially available poly vinyl alcohol (PVA) sponge was functionalized by acrylic acid (AA) to change its major functional group from hydroxyl to carboxylic, which provides a stronger ionic bond with PB. The amount of AA added was optimized by evaluating the weight change rate and iron(III) ion adsorption test. The FTIR results revealed the surface functional group changing to a carboxyl group. The surface functionalization enhanced the attachment of PB, which minimized the leaching out of PB. The Cs+ adsorption capacity significantly increased due to surface functionalization from 1.762 to 5.675 mg/g. These findings showed the excellent potential of the PB-PAA-PVA sponge as a cesium adsorbent as well as a versatile approach for various supporting materials containing the hydroxyl functional group.
Keywords: Acrylic acid | Cesium adsorbent | Poly vinyl alcohol sponge | Prussian blue | Radioactive material | Surface functionalization
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