MODELING OF BIOSORPTION OF PB(II) AND ZN(II) IONS ONTO PAMRH: LANGMUIR, FREUNDLICH, TEMKIN, DUBININRADUSKEVICH, JOVANOVIC, FLORYHUGGINS, FOWLER-GUGGENHEIM AND KISELEV COMPARATIVE ISOTHERM STUDIES

Biosorption of Pb2+ and Zn2+ onto Phosphoric Acid Modified Rice Husk (PAMRH) was carried out. The equilibrium adsorption data of Pb2+ and Zn2+ for initial concentration ranging from 10 – 200 mg g-1 were fitted into Langmuir, Freundlich, Temkin, Dubinin-Raduskevich, Jovanovic, Flory-Huggins, FowlerGuggenheim and Kiselev isotherm models. The comparative isotherm studies however, unraveled the adsorption capacities of PAMRH and a great affinity of the adsorbent (PAMRH) for Pb2+ than Zn2+.