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Titolo:
THE EFFECT OF PHOTOIRRADIATION ON HIGH-YIELD PULPS - SPECTROSCOPY ANDKINETICS
Autore:
TYLLI H; FORSSKAHL I; OLKKONEN C;
Indirizzi:
HELSINKI UNIV,DEPT CHEM,POB 19 SF-00014 HELSINKI FINLAND FINNISH PULP & PAPER RES INST,CTR PAPER SCI SF-02151 ESPOO FINLAND
Titolo Testata:
Journal of photochemistry and photobiology. A, Chemistry
fascicolo: 2, volume: 87, anno: 1995,
pagine: 181 - 191
SICI:
1010-6030(1995)87:2<181:TEOPOH>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIFERULIC ACID; LIGNIN; PEROXIDE; COLOR;
Keywords:
PHOTOIRRADIATION; HIGH-YIELD PULPS; SPECTROSCOPY; KINETICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
H. Tylli et al., "THE EFFECT OF PHOTOIRRADIATION ON HIGH-YIELD PULPS - SPECTROSCOPY ANDKINETICS", Journal of photochemistry and photobiology. A, Chemistry, 87(2), 1995, pp. 181-191

Abstract

Fluorescence, UV-visible reflectance and diffuse reflectance IR Fourier transform spectroscopy were used to study the changes caused by photoirradiation of unbleached, peroxide-bleached and ozone-bleached mechanical and chemimechanical pulps. Irradiations were performed selectively at 350 nm and emission spectra were obtained using the same excitation wavelength. Kinetic curves were obtained by plotting the integrated emission intensity against the irradiation time. Different domains of photochemical behaviour were observed for unbleached and ozone-bleached mechanical pulps. For peroxide-bleached samples, an exponential decay of the emission intensity was observed on irradiation, accompanied by a shift in the emission maximum to longer wavelengths. The observed emission spectra were deconvoluted into several components, and attempts were made to identify the chromophores causing the emission by comparison with the fluorescence spectra of model compounds.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 19:59:20