Sorption of Cd2+ and Pb2+ on Aragonite Synthesized from Eggshell
| Autor: | Mohd Danish Khan, Lulit Habte, Natnael Shiferaw, Thenepalli Thriveni, Ji-Whan Ahn |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Sorbent
Scanning electron microscope cadmium Carbonation Geography Planning and Development chemistry.chemical_element TJ807-830 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law engineering.material eggshells TD194-195 01 natural sciences Renewable energy sources symbols.namesake GE1-350 0105 earth and related environmental sciences Cadmium lead sorption Environmental effects of industries and plants Renewable Energy Sustainability and the Environment Precipitation (chemistry) Aragonite Langmuir adsorption model Sorption 021001 nanoscience & nanotechnology Environmental sciences chemistry engineering symbols 0210 nano-technology Nuclear chemistry |
| Zdroj: | Sustainability Volume 12 Issue 3 Sustainability, Vol 12, Iss 3, p 1174 (2020) |
| ISSN: | 2071-1050 |
| DOI: | 10.3390/su12031174 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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