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http://dx.doi.org/10.4491/KSEE.2013.35.9.636

Evaluation on Removal Efficiency of Methylene Blue Using Nano-ZnO/Laponite/PVA Photocatalyzed Adsorption Ball  

Oh, Ju Hyun (Construction Environment Research Division, Korea Institute of Construction Technology)
Ahn, Hosang (Construction Environment Research Division, Korea Institute of Construction Technology)
Jang, Dae Gyu (Construction Environment Research Division, Korea Institute of Construction Technology)
Ahn, Chang Hyuk (Construction Environment Research Division, Korea Institute of Construction Technology)
Lee, Saeromi (Construction Environment Research Division, Korea Institute of Construction Technology)
Joo, Jin Chul (Construction Environment Research Division, Korea Institute of Construction Technology)
Publication Information
Journal of Korean Society of Environmental Engineers / v.35, no.9, 2013 , pp. 636-642 More about this Journal
Abstract
In order to overcome drawbacks (i.e., filtration and recovery) of conventional powder type photocatalysts, nano-ZnO/Laponite/PVA (ZLP) photocatalyzed adsorption balls were developed by using in situ mixing of nanoscale ZnO as a photocatalyst, and Laponite as both adsorbent and supporting media in deionized water, followed by the poly vinyl alcohol polymerization with boric acid. The optimum mixing ratio of nano-ZnO:Laponite:PVA:deionized water was found to be 3:1:1:16 (by weight), and the mesh and film produced by PVA polymerization with boric acid might inhibit both swelling of Laponite and detachment of nanoscale ZnO from ZLP balls. Drying ZLP balls with microwave (600 watt) was found to produce ZLP balls with stable structure in water, and various sizes (55~500 ${\mu}m$) of pore were found to be distributed based on SEM and TEM results. In the initial period of reaction (i. e., 40 min), adsorption through ionic interaction between methylene blue and Laponite was the main removal mechanism. After the saturation of methylene blue to available adsorption sites for Laponite, the photocatalytic degradation of methylene blue occurred. The effective removal of methylene blue was attributed to adsorption and photocatalytic degradation. Based on the results from this study, synthesized ZLP photocatalyzed adsorption balls were expected to remove recalcitrant organic compounds effectively through both adsorption and photocatalytic degradation, and the risks of environmental receptors caused by detachment of nanoscale photocatalysts can be reduced.
Keywords
Adsorption; Laponite; Methylene Blue; Nano-ZnO/Laponite/PVA (ZLP); Photocatalytic Degradation; Photocatalyzed Adsorption Balls; Recalcitrant Organic Compounds; Zinc Oxide; Poly Vinyl Alcohol;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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