Abstract
This presentation elaborates the preparation of hydroxyapatite particles from waste mutton bones (MBHAP) by calcination at 650°C for 3 h. This hydroxyapatite was used as adsorbent for the removal of Cr (VI) ion particles from wastewater. The MBHAP was characterized by XRD, FT-IR, and SEM. The particle surface area of MBHAP was estimated by BET technique. The adsorption of Cr (VI) ions from wastewater solution onto MBHAP was examined. The batch adsorption tests were performed and the impact of different parameters, such as pH, initial Cr (VI) concentration, adsorbent dose, and contact time of the solution were determined by response surface methodology (RSM ). These parameters were optimized by desirability function to be 6, 200 mg/L, 0.3 g, and 15 min, respectively. Cr (VI) removal was 93.85 % at the optimum combination of these process parameters. The hexavalent chromium removal increased with increase in initial Cr (VI) ion concentration, adsorbent dose, and contact time. The adsorption isotherms and kinetics were studied. The Langmuir adsorption isotherm and the pseudo-second-order kinetic model best explained Cr (VI) adsorption onto MBHAP.
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