Copper, Zinc, Cadmium and Lead Biosorption by Gymnogongrus torulosus. Thermodynamics and Kinetics Studies

MARÍA MAR ARECO; MARÍA DOS SANTOS AFONSO

COLLOIDS AND SURFACES B-BIOINTERFACES

ELSEVIER SCIENCE BV

Año: 2010

0927-7765

Gymnogongrus torulosus adsorption efficiency for cadmium(II), copper(II), lead(II) and zinc(II) were studied in batch mode in different acidic conditions. The adsorbent removal efficiency was determined as a function of contact time, initial metal ions concentration, pH and temperature. Gymnogongrus torulosus was characterized by SEM, water adsorption surface area and EDS. The Langmuir, Freundlich, Dubinin–Radushkevich and Temkin models have been applied and results showed that the biosorption process was better described by the Langmuir model. Kinetic experiments demonstrated that fast metal uptakes follow a pseudo-second-order kinetic model and that intra-particle diffusion and/or chemisorption were the rate-limiting steps. Experimental results show that Gymnogongrus torulosus isotherm followed the biosorption series, Cu>Cd~Zn~Pb.Biosorption capacities were affected by solution parameters. The maximum metal uptake (qmax) increased with increasing pH. The affinity constant, qmax, and the pseudo-second-order kinetic constants were calculated for the adsorption of all studied metals onto Gymnogongrus torulosus. The Gibbs free energy of the adsorption process as well as the process enthalpy and entropy were calculated from experimental results.