Photocatalytic degradation of dimethoate using nanosized TiO"2 powder [An article from: Desalination]

This digital document is a journal article from Desalination, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Photocatalytic degradation of dimethoate using nanosized TiO"2 powder at different conditions were investigated in an XPA-II type reactor. The degradation efficiency of dimethoate increases with elevated concentration of TiO"2 suspension up to 0.6 g/L, while the efficiency reduced slightly when the concentration of TiO"2 is above 0.6 g/L due to the shielding effect. The kinetic rate of dimethoate degradation decreases with increasing initial concentration of dimethoate, which can be described using the first-order model. An alkaline environment and enhanced power of UVlamp are conducive to dimethoate degradation. The presence of H"2O"2/K"2S"2O"8 and ultrasonic irradiation can significantly enhance dimethoate degradation. However, the increment in degradation efficiency may be suppressed to some extent due to being scavenged of .OH species by excessive H"2O"2/K"2S"2O"8 at a high concentration level.