From Wastebin to Wastewater Treatment: Synthesis of Biogenic Carbonate Hydroxyapatite from Eggshells and Its Potential for Lead (Pb2+) Removal

Author(s)

Abdul-Rauf Ibrahim , Sulemana Yahaya , Tarlutu Ibrahim , Abdul-Mumin Abdulai ,

Download Full PDF Pages: 01-09 | Views: 201 | Downloads: 59 | DOI: 10.5281/zenodo.7611784

Volume 6 - December 2022 (12)

Abstract

We theorized that employing solid-solid reaction with high-pressure CO2 at low to medium temperatures using waste eggshells would be ideal for preparing carbonate hydroxyapatite (CHAp) powders. We synthesized bioCHAp from waste eggshells and investigated the performance of the product in the removal of lead (Pb2+) from contaminated (wastewater) water.
The results revealed that eggshells can be recycled to produce type-B bioCHAp with recommended biological apatite carbonate content (3.7 and 7.4 wt %). Furthermore, 40.0 mg of the bioCHAp removed 98.0 % of Pb2+ commendably from 200mL of 200mg/L (0.57mol/ml) lead acetate solution within 40 min and 100.0% of the Pb2+ in 50 min (half an hour). Interestingly, the bioCHAp also exhibited satisfactory adsorption of Pb2 + (85.0 %) in 60 min with 25 mg of the product. Eventually, the 25 mg bioCHAp yielded adsorption capacity of 1360.0 mg/g at equilibrium which is better than values reported for similar works in the literature.
 The results proved that the synthesized bioCHAp from waste eggshells could also be used as an effective and a cheaper biosorbent for heavy metal (Pb2+) removal.

Keywords

carbonated hydroxylapatite; wastewater treatment, lead, eggshells, Wastebin

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