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

Water

Heesoo Woo¹  Ilho Kim²  Saerom Park² 

[1] Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Seoul 02792, Korea;Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, Goyang-si 10223, Korea;

关键词: multi-wall carbon nanotubes;    granular activated carbon;    reduction;    adsorption;    chromium;    iron;   

DOI  :  10.3390/w13141959

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown