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PMMA-titania floating macrospheres for the photocatalytic remediation of agro-pharmaceutical wastewater.

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Bibliographic Details
Title: PMMA-titania floating macrospheres for the photocatalytic remediation of agro-pharmaceutical wastewater.
Authors: Hartley, Adam C.1, Moss, Joseph B.1, Keesling Jr., Kyle J.1, Moore, Nathanael J.1, Glover, Justin D.1, Boyd, Joel E.1 boyd@erskine.edu
Source: Water Science & Technology. 2017, Vol. 75 Issue 6, p1362-1369. 8p.
Subjects: Titanium dioxide, Floating (Fluid mechanics), Photocatalytic water purification, Tetracycline, Methyl methacrylate
Abstract: Antibiotics such as tetracycline are used on a large scale in agriculture, and can become concentrated in wastewater lagoons that are used in conjunction with confined animal feeding operations. Solar-illuminated titanium dioxide can be used to photocatalytically degrade aqueous tetracycline, but its application in a lagoon environment requires that the photocatalyst be supported on a macroscopic support material to prevent loss of the nanoscale photocatalyst into the environment. In this work, titanium dioxide was deposited within a porous poly(methyl methacrylate) film on the surface of floating 7.0 cm diameter acrylic spheres. Six of these floating spheres removed over 96% of the tetracycline in 3.5 L of 60 mg/L tetracycline in natural pond water during 24 hours of solar illumination. The durability of these spheres under long-term solar exposure was also investigated along with the amount of photocatalyst lost from the sphere surface during use. These macroscale floating composite spheres provide a new method for removing tetracycline from wastewater lagoons with minimal risk of being displaced in the environment due to the large size of the spheres. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Antibiotics such as tetracycline are used on a large scale in agriculture, and can become concentrated in wastewater lagoons that are used in conjunction with confined animal feeding operations. Solar-illuminated titanium dioxide can be used to photocatalytically degrade aqueous tetracycline, but its application in a lagoon environment requires that the photocatalyst be supported on a macroscopic support material to prevent loss of the nanoscale photocatalyst into the environment. In this work, titanium dioxide was deposited within a porous poly(methyl methacrylate) film on the surface of floating 7.0 cm diameter acrylic spheres. Six of these floating spheres removed over 96% of the tetracycline in 3.5 L of 60 mg/L tetracycline in natural pond water during 24 hours of solar illumination. The durability of these spheres under long-term solar exposure was also investigated along with the amount of photocatalyst lost from the sphere surface during use. These macroscale floating composite spheres provide a new method for removing tetracycline from wastewater lagoons with minimal risk of being displaced in the environment due to the large size of the spheres. [ABSTRACT FROM AUTHOR]
ISSN:02731223
DOI:10.2166/wst.2017.003