Changes on Fiber Surface During Prebleaching Comparing, Different Chlorine-Free Delignification Agents


  • Tjaša Drnovšek
  • Anton Perdih


Selective staining, ESCA measurements, charge determinations, prebleaching, ozone, peroxide


Three methods for surface characteristics of fibers were used (selective staining of fibers, ESCA measurements, and charge determination) to follow the delignification process during prebleaching with ozone and peroxide. The results of each method were evaluated with respect to the particular action of each agent. The method of selective staining with cationic dyes offers us a simple way to characterize the reactivity of fiber surface covered with lignin. The catatonic dyes' absorbancies are in correlation with the amount of active sites that belong to lignin (mostly phenolic groups), representing the differences between the course of delignification caused by either ozone or peroxide.


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