ASSESSMENT OF Pb2+ ABSORPTION CAPACITY IN WATER OF COW MANURE DERIVED BIOCHAR

Abstract

Biochar derived from animal waste is currently attracting much attention on the adsorption potential for water environment treatment. Investigation of adsorption mechanism and treatment efficiency of Pb²⁺ in water by cow manure derived biochar at 300, 450 and 600 °C temperatures was conducted. The biochar was equilibrated with Pb²⁺ solution at different concentrations, ranging from 0 to 160 mg/L for about 12 hours, and kinetic survey was conducted by exposing biochar to a solution containing 40 mgPb²⁺/L. Pb²⁺ adsorption process is suitable for Langmuir and Freundlich adsorption isotherm models for all 3 types of biochar. The maximum adsorption capacity of Pb²⁺ for biochar prepared at 300, 450 and 600 ºC is 40,5; 21.1 and 76.9 mg/g, respectively. The kinetic survey shows that the adsorption process reaches equilibrium after 1 hour and the second pseudo model is suitable to explain the Pb²⁺ adsorption kinetics to 3 types of biochar. The results indicate that cow manure is a waste that can be converted into valuable biochar as an adsorbent to remove Pb²⁺ from the water environment.

Keywords: Equilibrium and kinetics, adsorption of Pb²⁺, cow manure, biochar.