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- Language
- English
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
-
Received June 29, 2023
Revised August 3, 2023
Accepted August 6, 2023
- Acknowledgements
- This work was supported by R&D Project of the Korea Mine Rehabilitation and Mineral Resources Corporation in 2023.
- This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Efficient removal of hexavalent chromium (Cr(VI)) from wastewater using FeCl3-modified Chlorella-based biochar
Abstract
This study focuses on the adsorption of hexavalent chromium (Cr(VI)), a harmful heavy metal, using two
types of chlorella-based biochar (biochar pyrolyzed at 200 o
C (CB200) and iron chloride (FeCl3)-modified biochar pyrolyzed at 200 o
C (FeCB200)), and the testing of their effectiveness for the removal of Cr(VI). The FeCB200 sample
exhibited the highest removal efficiency (1 g L1
=66.12±1.01%; 5 g L1
=98.48±0.22%) compared to raw biomass (1 g
L1
=54.05±0.00%; 5 g L1
=90.09±0.26%) and CB200 (1 g L1
=51.80±0.78%; 5 g L1
=94.74±0.26%) in 100 mg L1
Cr(VI)
solution. The adsorbents were characterized using various characterization techniques, and adsorption experiments
were carried out using varying doses of the adsorbent (1 and 5 g L1
). Pseudo-second-order model provided the best fit
for the adsorption kinetics, and Redlich-Peterson model exhibited good fitting for the adsorption isotherm (R2
>0.972),
although variations were observed depending on the dose. Further, the applicability of FeCB200 was assessed using real
wastewater spiked with Cr(VI). Although the presence of organic matter resulted in a reduction in the adsorption
effectiveness of FeCB200, the difference was not significant (1 g L1
=54.27±3.19%; 5 g L1
=98.48±0.22%). These results
demonstrate the promising potential of FeCl3-modified chlorella-based biochar as a valuable adsorbent for the Cr(VI)
Keywords
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