THE EFFECT OF PHOTOIRRADIATION ON HIGH-YIELD PULPS - SPECTROSCOPY AND KINETICS

被引：24

作者：

TYLLI, H ^{[1
]}

FORSSKAHL, I ^{[1
]}

OLKKONEN, C ^{[1
]}

机构：

[1] FINNISH PULP & PAPER RES INST,CTR PAPER SCI,SF-02151 ESPOO,FINLAND

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 1995年 / 87卷 / 02期

关键词：

PHOTOIRRADIATION; HIGH-YIELD PULPS; SPECTROSCOPY; KINETICS;

D O I：

10.1016/1010-6030(94)03971-V

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：181 / 191

页数：11

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