The investigation of the LED-activated FeFNS-TiO2 nanocatalyst for photocatalytic degradation and mineralization of organophosphate pesticides in water

(2014) The investigation of the LED-activated FeFNS-TiO2 nanocatalyst for photocatalytic degradation and mineralization of organophosphate pesticides in water. Water Research.

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Abstract

This study evaluated the preparation and characterization of an efficient doped TiO2 as a novel catalyst for degradation of diazinon model pesticide using LED-activated photocatalysis. TiO2 was doped using N, NS, FeNS, and FeFNS. The FeFNS-doped TiO2 showed the highest catalytic activity in LED/photocatalysis. FeFNS-doped TiO2 is a mesoporous nanocrystal powder with a mean pore diameter of 10.2nm, a specific surface area of 104.4m2/g and a crystallite size of 6.7nm. LED/photocatalysis using FeFNS-doped TiO2 improved diazinon degradation by 52.3 over that of as-made plain TiO2 at an optimum solution pH of 7. The diazinon degradation in LED/photocatalysis using FeFNS-doped TiO2 increased from 44.8 to 96.3 when the catalyst concentration increased from 25 to 300at a reaction time of 100min. The degradation and mineralization of diazinon during LED/photocatalysis with FeFNS-doped TiO2 catalyst followed the pseudo-first-order reaction model with the rate constants of 0.973h-1 and 0.541h-1, respectively. The FeFNS-doped TiO2 was found to be an efficient catalyst that was photoactivated using UV-LED lamps. LED/photocatalysis with FeFNS-doped TiO2 catalyst is a promising alternative to conventional UV/TiO2photocatalysis for producing free OH radicals for use in the degradation and mineralization of water toxic contaminants. © 2014 Elsevier Ltd.

Item Type: Article
Additional Information: cited By
Keywords: Elemental doping; LED; Pesticide oxidation; Photocatalysis
Subjects: Environmental health
Divisions: Education Vice-Chancellor Department > Faculty of Health > Department of Environmental Health Engineering
Depositing User: دکتر مهری غلامی
URI: http://eprints.abzums.ac.ir/id/eprint/1734

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