PARAMETRII FIZICO-CHIMICI CARE INFLUENȚEAZĂ RATA DE OXIDARE/MINERALIZARE A SĂRII DE NATRIU A ACIDULUI LIGNOSULFONIC CU REAGENTUL FENTON

Larisa MOCANU, Maria GONȚA, Gheorghe DUCA* Universitatea de Stat din Moldova *Academia de Științe a Moldovei

Аннотация

PARAMETRES AFFECTING THE OXIDATION/MINERALIZATION RATE  OF LIGNOSULFONIC ACID SODIUM SALT USING FENTON’S REAGENT

Lignosulfonic acid sodium salt is a dispersing agent has used in the process of dyeing fibers and fabrics widely. The initial concentration of the dispersing agent is 2000,0-5000,0 mg/L in the dyeing bath. Whereas lignosulfonic acid sodium salt has a complex structure and a high molecular weight, its removal was achieved by the Fenton reagent oxidation method.

The optimum catalytic oxidation conditions have been established. It has been determined that the optimal value of pH is 2.5 as a result of the research. Also experimentally, it determined oxidizing and reducing ratio so as to oxidise/ mineralise 60,0 mg L of dispersing agent is necessary that the ratio of hydrogen peroxide and iron ions (II) is 1: 3,5.

Under these conditions, the oxidation/ mineralization effect is on average 82.0%. For greater efficiency, oxidation with the Fenton reagent should be followed by the activated carbon adsorption process.

Keywords: dispersing agent, Fenton’s reagent, Fenton’s reagent, hydrogen peroxyde, iron ions