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Three biomimetic systems were evaluated for their selectivity in a model system for pulp. FeSO 4 , Fe-EDTA and hemoglobin, in the presence of H 2 O 2 , constituted the biomimetic systems. Sodium lignosulfonate and hydroxyethyl cellulose (HEC) were used as a model system to represent lignin and carbohydrate fractions in pulp. A simple kinetic model was used to determine kinetic parameters for depolymerization of each substrate. Point selectivities at two different H 2 O 2  concentrations were evaluated on the basis of the resulting expressions. Hemoglobin demonstrated superior selectivity for lignosulfonate degradation at a high H 2 O 2  level. The production of hydroxyl radicals from each of the biomimetic systems was measured using a chemiluminescence assay. For the FeSO 4  and Fe-EDTA systems, depolymerization was related to the amount of radicals generated. The fate of reacted H 2 O 2  was evaluated using a specially designed reactor to measure H 2 O 2  consumed by reaction and that decomposed. To achieve a given number of chain scission in lignosulfonate, the hemoglobin system consumed the least amount of H 2 O 2 .

Selectivity and Efficiency of Biomimetic Catalysts in a Model System for Pulp Bleaching