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http://dx.doi.org/10.5012/jkcs.2012.56.1.092

Photo-Assisted Sondegradation of Hydrogels in the Presence of TiO2 Nanoparticles  

Ebrahimi, Rajabali (Member of young researchers club, Islamic Azad University)
Tarhandeh, Giti (Member of Scientific Association of chemistry, Takestan branch, Islamic Azad University)
Rafiey, Saeed (Member of Scientific Association of chemistry, Takestan branch, Islamic Azad University)
Narjabadi, Mahsa (Member of Scientific Association of chemistry, Takestan branch, Islamic Azad University)
Khani, Hamed (Member of Scientific Association of chemistry, Takestan branch, Islamic Azad University)
Publication Information
Journal of the Korean Chemical Society / v.56, no.1, 2012 , pp. 92-101 More about this Journal
Abstract
The degradation of one of the commercially important hydrogel based on acrylic acid and acryl amide, (acrylic acid-co-acryl amide) hydrogels, by means of ultrasound irradiation and its combination with heterogeneous ($TiO_2$) was investigated. 24 kHz of ultrasound irradiation was provided by a sonicator, while an ultraviolet source of 16 W was used for UV irradiation. The extent of sonolytic degradation increased with increasing ultrasound power (in the range 30-80 W). $TiO_2$ sonophotocatalysis led to complete (acrylic acid-co-acryl amide) hydrogels degradation with increasing catalyst loading, while, the presence of $TiO_2$ in the dark generally had little effect on degradation. Therefore, emphasis was totally on the sonolytic and sonophotocatalytic degradation of hydrogels and a synergy effect was calculated for combined degradation procedures (Ultrasound and Ultraviolet) in the presence of $TiO_2$ nanoparticles. $TiO_2$ sonophotocatalysis was always faster than the respective individual processes due to the enhanced formation of reactive radicals as well as the possible ultrasound-induced increase of the active surface area of the catalyst. A kinetics model based on viscosity data was used for estimation of degradation rate constants at different conditions and a negative order for the dependence of the reaction rate on total molar concentration of (acrylic acid-co-acryl amide) hydrogels solution within the degradation process was suggested.
Keywords
(acrylic acid-co-acryl amide) hydrogels; Degradation; Sonophotocatalysis; Viscosity; $TiO_2$ nanoparticles;
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