Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 199, Issue -, Pages 220-227Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2018.03.057
Keywords
PVA/PVP blend; Optical parameters; Methylene blue; Photodegradation
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Homogenous films of PVA/PVP blend (1:1) doped with different levels of methylene blue dye (MB) were prepared using the casting technique. The absorption spectra of doped PVA/PVP blend showed two absorption peaks due to the chromophor groups of MB while the pure PVA/PVP blend does not. The UV irradiation causes photodegradation of MB dye. The recovery of photodegraded MB is observed after keeping the sample 3 h in atmospheric air. The value of the optical energy gap (E-g) decreases with increasing the doping levels with MB. The spectral distribution of absorption index (k) and refractive index (n) are determined from the reflection and transmission spectra in the spectral range 200-2500 nm. The dependence of both n and k on wavelength of the incident light and the wt% content of MB in PVA/PVP blend is discussed. A normal dispersion observed at wavelength lambda> 370 nm for pure PVA/PVP blend and lambda> 800 nm for MB doped samples. The obtained results suggest the possible use of the studied system in many applications. (C) 2018 Elsevier B.V. All rights reserved.
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