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Estimating the Reducing Power of Carbon Nanotubes and Granular Activated Carbon Using Various Compounds

by 1, 2 and 2,*
1
Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Seoul 02792, Korea
2
Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, Goyang-si 10223, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Maria João Rosa and Rui M. C. Viegas
Water 2021, 13(14), 1959; https://doi.org/10.3390/w13141959
Received: 2 June 2021 / Revised: 12 July 2021 / Accepted: 14 July 2021 / Published: 16 July 2021
(This article belongs to the Special Issue Advanced Technologies for Water Reclamation and Reuse)
Determining the degree of the reducing power of multi-walled carbon nanotubes (MWCNTs) and granular activated carbon (GAC) enables their effective application in various fields. In this study, we estimate the reducing power of carbon nanotubes (CNTs) and GAC by measuring the reduction degree of various compounds with different reduction potentials. MWCNTs and GAC materials can reduce Cr(VI), Fe(III) and PMo12O403−, where the reduction potentials range from +1.33 V to +0.65 V. However, no reduced forms of PW12O403− and SiW12O404− compounds were detected, indicating that the reducing power of MWCNTs and GAC is insufficient for reduction potentials in the range +0.218 V to +0.054 V. MWCNTs exhibit a short reduction time (5 min), whereas GAC exhibits a gradually increasing reduction degree of all the compounds assessed until the end of the reaction. This indicates a higher reduction degree than that of MWCNTs systems. Acidic initial pH values favor reduction, and the reduction degree increases as the pH becomes lower than 4.0. Moreover, large quantities of MWCNTs and GAC increase the concentrations of the reduced compounds. View Full-Text
Keywords: multi-wall carbon nanotubes; granular activated carbon; reduction; adsorption; chromium; iron; polyoxometalate multi-wall carbon nanotubes; granular activated carbon; reduction; adsorption; chromium; iron; polyoxometalate
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MDPI and ACS Style

Woo, H.; Kim, I.; Park, S. Estimating the Reducing Power of Carbon Nanotubes and Granular Activated Carbon Using Various Compounds. Water 2021, 13, 1959. https://doi.org/10.3390/w13141959

AMA Style

Woo H, Kim I, Park S. Estimating the Reducing Power of Carbon Nanotubes and Granular Activated Carbon Using Various Compounds. Water. 2021; 13(14):1959. https://doi.org/10.3390/w13141959

Chicago/Turabian Style

Woo, Heesoo, Ilho Kim, and Saerom Park. 2021. "Estimating the Reducing Power of Carbon Nanotubes and Granular Activated Carbon Using Various Compounds" Water 13, no. 14: 1959. https://doi.org/10.3390/w13141959

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