Discolourization of ammonium lignosulfonate by h2o2 activated with co (acac)2 immobilized on functionalized silica

Maurusa-Elena Ignat1, Viorica Dulman2, Dumitru G nju2, Valentin I. Popa3

1 Petru Poni Institute of Macromolecular Chemistry, 41 A Gr. Ghica Vod , 700487 Iasi, Rom nia
2 Alexandru Ioan Cuza University of Iasi, Faculty of Chemistry, 11 Carol I Blvd., 700506 Iasi, Rom nia
3 Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, 73 Prof.dr.docent Dimitrie Mangeron Street, 700050 Iasi, Rom nia

Abstract


The potential of ammonium lignosulfonate (ALS) discolouring and partial degradation in aqueous solution was studied in heterogeneous system by using the hydrogen peroxide and Co (II) acetylacetonate immobilized on functionalized silica (HC-Co II) as a catalyst. In order to optimize the system efficiency, the influence of process parameters like H2O2 concentration, pH, contact time, ALS concentration, temperature and catalyst amount was evaluated. Lignosulfonate degradation was furthermore pointed out through modification of final pH and determination of phenolic compounds. The catalyst stability and its reusability have also investigated. The experimental results indicate that, in optimal conditions, the ammonium lignosulfonate solutions exhibit a total discolourization, associated with its significant degradation.

Keywords


ammonium lignosulfonate; Co (II) catalyst; discolourization; heterogeneous catalysis; hydrogen peroxide

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