TITLE

Visible light photocatalytic water disinfection and its kinetics using Ag-doped titania nanoparticles

AUTHOR(S)
Younas, Hassan; Qazi, Ishtiaq; Hashmi, Imran; Ali Awan, M.; Mahmood, Asif; Qayyum, Hafiz
PUB. DATE
January 2014
SOURCE
Environmental Science & Pollution Research;Jan2014, Vol. 21 Issue 1, p740
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The UN estimated about five million deaths every year due to water-borne diseases, accounting from four billion patients. Keeping in view, the ever increasing health issues and to undermine this statistics, a reliable and sustainable water-treatment method has been developed using visible light for water treatment. titania nanoparticles (NPs) have been synthesized successfully by a more applicable method Viz: liquid impregnation (LI) method. The bacterial death rate by photocatalysis under visible light was studied by employing a typical fluorescent source and was found to follow pseudo first-order reaction kinetics. The nanoparticles were characterized using X-ray diffraction (XRD), scanning electron microscopy, and energy-dispersive X-ray spectroscopy to deduce their size range, surface morphology, and elemental compositions, respectively. Among all the prepared grades, 1 % Ag-TiO was found to be a very effective photocatalytic agent against Escherichia coli. The resulted photoinactivated data were also evaluated by different empirical kinetic models for bacterial inactivation. Hom, Hom-power, Rational, and Selleck models were not able to explain the disinfection kinetics but modified-Hom model fitted best with the experimentally obtained data by producing a shoulder, log-linear, and a tail region.
ACCESSION #
93391735

 

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