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.
PMMA-titania floating macrospheres for the photocatalytic remediation of agro-pharmaceutical wastewater
Adam C. Hartley, Joseph B. Moss, Kyle J. Keesling, Nathanael J. Moore, Justin D. Glover, Joel E. Boyd; PMMA-titania floating macrospheres for the photocatalytic remediation of agro-pharmaceutical wastewater. Water Sci Technol 23 March 2017; 75 (6): 1362–1369. doi: https://doi.org/10.2166/wst.2017.003
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