Article ID Journal Published Year Pages File Type
4481533 Water Research 2014 15 Pages PDF
Abstract

•Modification of TiO2 by mix-doping with metal (Fe) and nonmetal (F, N, S) elements.•Developing an efficient FeFNS-TiO2 that can be activated using UV-LED lamps.•Developing an energy-efficient photocatalytic advanced oxidation process.•Efficient degradation and mineralization of pesticides using a FeFNS-TiO2/LED process.

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 10.2 nm, a specific surface area of 104.4 m2/g and a crystallite size of 6.7 nm. 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 300%at a reaction time of 100 min. 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 0.973 h−1 and 0.541 h−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.

Graphical abstractTiO2 was doped with various metal (Fe) and nonmetal (F, N, S) elements and the potential photoactivation of the prepared materials was tested using LED lamps as UV light source. FeFNS-TiO2 had the highest catalytic potential using LED as the activation light source and attained the highest rate of degradation and mineralization of diazinon. Figure optionsDownload full-size imageDownload high-quality image (86 K)Download as PowerPoint slide

Related Topics
Physical Sciences and Engineering Earth and Planetary Sciences Earth-Surface Processes
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