Lead Adsorption in Aqueous Solution by Giant Mimosa Pods Treated with NaOH

Abstract

This research aimed to study the potential of lead adsorption in aqueous solution
by using 1.5 M NaOH-treated giant mimosa pods, comparing these with untreated pods.
Batch experiment was carried out to investigate the effect of experimental parameters
such as adsorbent dose, contact time, pH solution and initial lead concentration, and
Langmuir and Freundlich isotherm were used to analyze the equilibrium adsorption.
The findings found that the pretreatment could reduce adsorbent dose and increase an
adsorbing potential on the initial lead concentration (5 mg/l) with the optimal contact
time at 15 min and pH solution at 5. According to isotherm study, it fit to a monolayer
adsorption explanation by the Langmuir equation. The pretreatment enhanced the
maximum adsorption capacity over than the untreated treatment (2.05 > 1.34 mg/g).