This study focused on kinetics, equilibrium and thermodynamics of Acid Blue 25 (AB25) dye biosorption
from aqueous solution using the shell of Penaeus indicus shrimp as a biosorbent. Optimum sorption
conditions were identified by varying solution pH, biomass dosage, initial dye concentration, contact
time, salinity and ionic strength. Equilibrium data were well fitted by the Temkin, Freundlich and
Langmuir isotherm models, while the pseudo-second order model best described kinetics.
Thermodynamic data showed that AB25 dye biosorption onto shrimp shell was a feasible, spontaneous
and exothermic one. The biosorption capacity increased with decreasing the sorbent particle size and
with the addition of salts (NaCl, MgSO4, KNO3 and KH2PO4). The high sorption capacity of P. indicus shell
obtained in this study suggests its use as an effective, low-cost biosorbent for the removal of acid dyes
from wastewaters.
کلید واژگان :
Acid Blue 25, Penaeus indicus shell, Biosorption, Kinetics, Equilibrium
