Abstract
Neem (Azadirachta indica) leaf powder was treated with hydrogen peroxide followed by sodium hydroxide and its performance in Pb (II) removal was investigated. The characteristic of chemically treated neem leaf powder (CTNLP) was studied using Attenuated Total Reflectance Infra-red (ATR-IR) spectrometer and CHNOS Analyzer. The amount of Pb (II) adsorbed increased with increasing pH, concentration and contact time. The kinetic study indicated that adsorption equilibrium time was dependent on initial Pb (II) concentrations. The adsorption kinetic data fitted the pseudo-second-order model. The maximum adsorption capacity calculated from the Langmuir isotherm model was 227.3 mg/g. This study suggests suitable use of CTNLP as an adsorbent for treating wastewater containing Pb (II).
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