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- W2006369564 abstract "The presence of transition metal ions, such as iron, in lignin rich pulp fibers has negative consequences on pulp brightness and brightness stability. Earlier studies showed that impregnation of lignin-rich pulps with chelants, such as DTPA and EDTA, is very effective in recovering the brightness loss and reducing both the photo-yellowing and thermal yellowing of mechanical pulps. In this study, the fundamentals associated with such a process are further studied with lignin model compounds in combination with UV-Vis spectroscopicy. Four lignin model compounds, guaiacol, veratrole, vanillin and creosol, were tested. It was found that transition metal ions and lignin model compounds by themselves did not exhibit significant absorbance in the visible light range. However, when the two components were combined, a significant visible absorbance was observed. This was explained by the formation of coloured complexes between the transition metal ion and lignin model compounds, and transition metal ioniinduced coupling reactions. Among the transition metal ion species studied Fe(III), Fe(II), Cu(II), Mn(II) and Al(III),Fe(III) showed the strongest effect. In most cases, addition of a chelant to solutions containing transition metal ions and a lignin model compound reduced absorbance in the visible light range and blocked the coupling reactions. Furthermore, the EDTA-and DTPA-metal ion complexes exhibited ultraviolet shielding properties, which could be partly responsible for reduced photo-yellowing, when lignin-rich pulps are chelated." @default.
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- W2006369564 date "2001-05-31" @default.
- W2006369564 modified "2023-10-14" @default.
- W2006369564 title "UV-VIS SPECTRA OF LIGNIN MODEL COMPOUNDS IN THE PRESENCE OF METAL IONS AND CHELANTS" @default.
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- W2006369564 doi "https://doi.org/10.1081/wct-100104222" @default.
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