S. Wierzba; A. Dzieniszewska
University of Opole, Independent Department of Biotechnology and Molecular Biology, Opole, PL

BIOSORPTION OF CU(II) FROM AQUEOUS SOLUTION BY MODIFIED PALMARIA PALMATA BIOMASS


Current experiments focused on evaluation of physical and chemical modifications of Palmaria palmata algae biomass impact on Cu(II) biosorption from aqueous solutions. Study range included the influence of temperature of 105 i 121oC, and of 0,05 M NaOH and 0,05 M HCl on kinetic and equilibrium parameters of biosorption. Additionally the influence of pH and biosorbent dose on algae biomass sorption capacity and thermodynamic parameters of process were established. The study was performed in static conditions, concentration of copper (II) in solution has been measured using spectrophotometric method with cuvette tests. The most efficient biosorption was obtained with solution of initial pH 5,0 and algae dose of 1 g·L-1. Experimental data were better described by pseudo-second order kinetic model and Langmuir isotherm, which suggest a chemical nature of process. Chemical modification of biomass was found to be advantageous for process progress rate and copper (II) ions binding. Alkalization with 0,05 M NaOH solution increased biomass sorption capacity almost twice, to the maximum value 25,71 mg·g-1. Thermodynamic study proved that Cu(II) biosorption by Palmaria palmata occurred spontaneously and exothermically, which was energetically advantageous for process progress. Palmaria palmata algae is inexpensive, easy available biosorbent, which can be used to remove copper (II) ions from wastewater.

Keywords: biosorption, Cu(II), chemical modifications, Palmaria palmata