Abstract— The purpose of this study is to investigate the effectiveness of rice husk, saw dust and tea waste as adsorbent for the removal of cadmium, chromium and lead ions respectively. The main parameters that influenced heavy metal adsorption on bioadsorbent were adsorbent dosage, % removal and pH value. Using the initial concentrations of lead, cadmium and chromium solutions at 10 ppm, the analysis was continued using contact time 60 mins. Besides that the influences of adsorbent dosage also been studied in a range of 10mg to 30mg.After that contains of heavy metal ions were analyzed using Atomic Adsorption Spectrophotometre (AAS). The maximum % removal of cadmium is 95.7% at 20ppm of initial concentration and 20mg adsorbent dosage of rice husk at pH 6.The maximum % removal of chromium is 98.75% at 20ppm of initial concentration and 10mg adsorbent dosage of sawdust at pH 3.The maximum % removal of lead is 99.25% at 20ppm of initial concentration and 10mg adsorbent dosage of tea waste at pH 5.5 batches. The batch studies revealed that the adsorption was influenced by the initial metal concentration, the biomass dose and solution pH. Langmuir isotherm model (R2≈1) was used to analyze the equilibrium data.
Keywords— Bioadsorbent , Rice husk, saw dust, tea waste , Heavy metals, Isotherms, Kinetics.
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