Abstract
Agricultural waste biomass has recently gained attention in the field of wastewater remediation because of their abundance and renewable nature. In the present study, agricultural waste cellulosic biomass has been modified through succinylation reaction and subsequently used as an adsorbent for the removal of Cu2+, Zn2+, Cd2+ and Pb2+ toxic metal ions from aqueous solution. The removal of metal ions from aqueous solution was investigated as a function of pH, contact time, temperature and metal ion con- centration. Pseudo-second-order kinetic model was used to study adsorption kinetics for all metal ions. Langmuir isotherm model was applied to describe the adsorption isotherm and maximum adsorption capacity qm calculated for Cu2+, Zn2+, Cd2+, Pb2+ metal ions were 72.72, 57.11, 121.51 and 273.97 mg/g respectively. The thermodynamic parameters ΔH° and ΔG° values for metals ion adsorption on the succinylated okra biomass adsorbent showed the process to be spontaneous and exothermic in nature.
