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Article

Sorption of Cd2+ and Pb2+ on Aragonite Synthesized from Eggshell

1
Resources Recycling Department, University of Science and Technology (UST), 217, Gajeong-ro, Yuseong-gu, Daejeon-34113, Korea
2
Center for Carbon Mineralization, Mineral Resources Research Division, Korea Institute of Geosciences and Mineral Resources (KIGAM), 124 Gwahak-ro, Yuseong-gu, Daejeon-34132, Korea
3
International Center for Urban Water Hydroinformatics Research & Innovation, 169 Gaetbeol, yeonsu-gu, Incheon, Korea
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(3), 1174; https://doi.org/10.3390/su12031174
Received: 31 December 2019 / Revised: 3 February 2020 / Accepted: 4 February 2020 / Published: 6 February 2020
(This article belongs to the Special Issue EARTH 2019-Green Technologies for Resources and Materials Recycling)
In the present work, waste eggshells were used as a precursor for the synthesis of aragonite crystals through the wet carbonation method. Cadmium (Cd2+) and lead (Pb2+) were removed by the synthesized aragonite from synthetic wastewater. The influence of initial solution pH, contact time, Cd2+ and Pb2+ concentration, and sorbent dosage were evaluated. The major sorption was observed in the first 100 mins and 360 mins for Pb2+and Cd2+ respectively reaching sorption equilibrium at 720 mins (12 hr). The sorption capacity toward Pb2+ was much higher than toward Cd2+. Both heavy metals displayed high sorption capacities at initial pH 6. The pseudo-second-order kinetic model fits well with the experimental data with a higher correlation coefficient R2. Two isotherm models were also evaluated for the best fit with the experimental data obtained. Langmuir isotherm best fits the sorption of the metals on aragonite synthesized from eggshells. X-ray diffraction (XRD) and Scanning electron microscopy (SEM) results of sorbent after sorption showed that the mechanism of sorption was dominated by surface precipitation. Therefore, aragonite crystals synthesized from waste eggshells can be a potential substitute source for the removal of Cd2+ and Pb2+ from contaminated water. View Full-Text
Keywords: Aragonite; eggshells; lead; cadmium; sorption Aragonite; eggshells; lead; cadmium; sorption
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MDPI and ACS Style

Habte, L.; Shiferaw, N.; Khan, M.D.; Thriveni, T.; Ahn, J.W. Sorption of Cd2+ and Pb2+ on Aragonite Synthesized from Eggshell. Sustainability 2020, 12, 1174. https://doi.org/10.3390/su12031174

AMA Style

Habte L, Shiferaw N, Khan MD, Thriveni T, Ahn JW. Sorption of Cd2+ and Pb2+ on Aragonite Synthesized from Eggshell. Sustainability. 2020; 12(3):1174. https://doi.org/10.3390/su12031174

Chicago/Turabian Style

Habte, Lulit, Natnael Shiferaw, Mohd Danish Khan, Thenepalli Thriveni, and Ji Whan Ahn. 2020. "Sorption of Cd2+ and Pb2+ on Aragonite Synthesized from Eggshell" Sustainability 12, no. 3: 1174. https://doi.org/10.3390/su12031174

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