Removal of Heavy Metals from Wastewater using α-Fe2O3 Nanocrystals
| Autor: | Ji Eun Lee, Seok Hwan Huh, Chan Gyu Lee, Bulgan Tsedenbal, Bon Heun Koo |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Korean Journal of Materials Research. 30:447-452 |
| ISSN: | 2287-7258 1225-0562 |
| DOI: | 10.3740/mrsk.2020.30.9.447 |
| Popis: | In this work, α-Fe2O3 nanocrystals are synthesized by co-precipitation method and used as adsorbent to remove Cr6+, Cd2+, and Pb2+ from wastewater at room temperature. The prepared sample is evaluated by XRD, BET surface area, and FESEM for structural and morphological characteristics. XRD patterns confirm the formation of a pure hematite structure of average particle size of ~ 40 nm, which is further supported by the FESEM images of the nanocrystals. The nanocrystals are found to have BET specific surface area of ~ 39.18 m2 g−1. Adsorption experiments are carried out for the different values of pH of the solutions, contact time, and initial concentration of metal ions. High efficiency Cr6+, Cd2+, and Pb2+ removal occur at pH 3, 7, and 5.5, respectively. Equilibrium study reveals that the heavy metal ion adsorption of the α-Fe2O3 nanocrystals followed Langmuir and Freundlich isotherm models. The Cr6+, Cd2+, and Pb2+ adsorption equilibrium data are best fitted to the Langmuir model. The maximum adsorption capacities of α-Fe2O3 nanocrystals related to Cr6+, Cd2+, and Pb2+ are found to be 15.15, 11.63, and 20 mg g−1, respectively. These results clearly suggest that the synthesized α-Fe2O3 nanocrystals can be considered as potential nano-adsorbents for future environmental and health related applications. |
| Databáze: | OpenAIRE |
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