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Multifunctional Silver Coated E-33/Iron Oxide Water Filters: Inhibition of Biofilm Growth and Arsenic Removal
Citation:
NADAGOUDA, M. N., C. BENNETT-STAMPER, C. WHITE, AND D. LYTLE. Multifunctional Silver Coated E-33/Iron Oxide Water Filters: Inhibition of Biofilm Growth and Arsenic Removal. RSC Advances. RSC Publishing, Cambridge, Uk, 2(10):4198-4204, (2012).
Impact/Purpose:
To inform the public.
Description:
Bayoxide® E33 (E-33, Goethite) is a widely used commercial material for arsenic adsorption. It is a mixture of iron oxyhydroxide and oxides. E-33 is primarily used to remove arsenic from water and to a lesser extent, other anions, but generally lacks multifunctuality. It is a non-magnetic, iron oxyhydroxide/oxide and is primarily used in fixed bed filters. E-33, as well as other adsorption media are subject to surface fouling by precipitates including iron and manganese. Biofilm could also conceivably create diffusion limitations and thus be undesirable. The addition of silver nanoparticles to the surface of arsenic adsorption media such as E-33 could enhance the materials’ multifunctionality. Furthermore, modifying such materials properties (e.g. changing magnetic properties) could also is beneficial, provided that the original materials’ arsenic adsorption properties are not compromised. Herein, we report multifunctionality to a commercially available arsenic adsorption media to combine a core-shell approach and create the multifunctional component that is absent from current approaches. Specifically, the work will create core-shell composites i.e silver coated goethite (in magnetic and non magnetic form) that are capable of both removing arsenic and serving an antibacterial purpose as well as have magnetic properties. Several different green approaches have been developed to prepare silver coated goethite and these composites have been tested for arsenic removal and antibacterial studies. The obtained samples were characterized using, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray florescence spectroscopy (XRF), and inductively coupled plasma mass spectroscopy (ICP-MS).
