آب و فاضلاب (Apr 2014)
The use of chitin shrimp shells for the biosorption of zinc from aqueous solutions
Abstract
The removal of zinc ions from aqueous solutions on the chitin extracted of shrimp shells has been studied by using batch adsorption method. Experiments were performed as a function of initial pH (3-7), initial metal concentration (50-500mg/l), and adsorbent dose (0/5-10 gr) at 25°C. .The equilibrium metal uptake was increased and percentage biosorption was decreased with an increase in the initial concentration. So, the data showed that optimum pH for efficient biosorption of zinc by chitin was 7. The pseudo first order and pseudo second order kinetic models were used to describe the kinetic data. The dynamic data fitted with the pseudo second order kinetic model for zinc. So, Experimental data obtained were tested with the adsorption models like Langmuir and Freundlich models and Biosorption isothermal data were well correspond by Freundlich model. So that chitin extracted of shrimp shells relatively high sorption capacity, when comparing with other sorbents that was evaluated as 270.270 mg/g.
