POLYELECTROLYTE COMPLEXES BASED ON LIGNOSULFONATES AND CHITOSAN TO TREAT EFFLUENTS GENERATED BY PULP AND PAPER PLANTS
Polyelectrolyte complexes based on natural compounds (lignosulfonates - LS and chitosan CT) were obtained for the first time. The conditions to form polyelectrolyte complex in LSNa-CT are outlined specifying the domain of phase transitrrions. Through complexation of lignosulfonate with chitosan, a deep recovery of lignosulfonates (95%) from effluents generated by sulphite process in pulp production is obtained. These polyelectrolyte complexes were then used to obtain sorbents to recover heavy metal ions Си (II), Ni (II), Cr (VI), Co (II), Hg (II), Ag (I) from solutions. The impact of conditions associated with the sorption process on the sorption capacity is examined. It was demonstrated that in principle polyelectrolyte complex can be used as a semipermeable membranes for dialysis of lignosulfrnate solutions.