NDLI: Sonophotocatalytic Degradation of Chitosan in the Presence of Fe(III)/H$_{2}$O$

Content Provider	Springer Nature Link
Author	Taghizadeh, Mohammad Taghi Abdollahi, Reza Orang, Naser Sadeghpour
Copyright Year	2011
Abstract	The degradation of chitosan by means of ultrasound irradiation and its combination with homogeneous photocatalysis (photo-Fenton) was investigated. Emphasis was given on the effect of additive on degradation rate constants. 24 kHz of ultrasound irradiation was provided by a sonicator, while an ultraviolet source of 16 W was used for UV irradiation. To increase the efficiency of degradation process, degradation system was combined with Fe(III) (2.5 × 10$^{−4}$mol/L) and H$_{2}$O$_{2}$ (0.020–0.118 mol/L) in the presence of UV irradiation and the rate of degradation process change from 1.873 × 10$^{−9}$−6.083 × 10$^{−9}$ mol$^{1.7}$ L s$^{−1}$. Photo-Fenton process led to complete chitosan degradation in 60 min with the rate increasing with increasing catalyst loading. Sonophotocatalysis in the presence of Fe(III)/H$_{2}$O$_{2}$ was always faster than the respective individual processes. A synergistic effect between ultrasound and ultraviolet irradiation in the presence of Fenton reagent was calculated. The degraded chitosans were characterized by X-ray diffraction (XRD), gel permeation chromatography (GPC) and Fourier transform infrared (FT-IR) spectroscopy and average molecular weight of ultrasonicated chitosan was determined by measurements of intrinsic viscosity of samples. The results show that the total degree of deacetylation (DD) of chitosan change, partially after degradation and the decrease of molecular weight led to transformation of crystal structure. A negative order for the dependence of the reaction rate on total molar concentration of chitosan solution within the degradation process was suggested. Results of this study indicate that the presence of catalyst in the reaction medium can be utilized to reduce molecular weight of chitosan while maintaining the power of irradiated ultrasound and degree of deacetylation.
Starting Page	208
Ending Page	216
Page Count	9
File Format	PDF
ISSN	15662543
Journal	Journal of Polymers and the Environment
Volume Number	20
Issue Number	1
e-ISSN	15728900
Language	English
Publisher	Springer US
Publisher Date	2011-12-29
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chitosan Sono-Fenton Sonophoto-Fenton Fe(III)/H$_{2}$O$_{2}$ Viscosity Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Environmental Engineering Polymers and Plastics

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