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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.30 No.9 pp.447-452
DOI : https://doi.org/10.3740/MRSK.2020.30.9.447

Removal of Heavy Metals from Wastewater using α-Fe2O3 Nanocrystals

Bulgan Tsedenbal1,Ji Eun Lee1,Seok Hwan Huh2,Bon Heun Koo1,Chan Gyu Lee1†
1School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 51140, Republic of Korea
2School of Mechatronics Convergence Engineerings, Changwon National University, Changwon, Gyeongnam 51140, Republic of Korea
Corresponding author E-Mail : chglee1225@gmail.com (C. G. Lee, Changwon Nat'l Univ.)

Abstract

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.

초록

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