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Nitric acid oxidation on carbon dispersion and suspension stability
Author(s) -
Zhang Ning,
Wang Liuyan,
Liu Hao,
Cai QingKui
Publication year - 2008
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.2864
Subject(s) - nitric acid , zeta potential , titration , chemistry , suspension (topology) , dispersion (optics) , particle size , fourier transform infrared spectroscopy , scanning electron microscope , activated carbon , dispersion stability , inorganic chemistry , nuclear chemistry , particle (ecology) , chemical engineering , organic chemistry , materials science , adsorption , nanotechnology , nanoparticle , composite material , mathematics , oceanography , engineering , optics , polymer , homotopy , physics , pure mathematics , geology
In this study, we have investigated the effect of nitric acid oxidation on the dispersion and suspension stability of activated carbon powder. We treated activated carbon powder with nitric acid at different concentrations. We measured the content of functional groups, the zeta potential and the powder particle size of the activated carbon powder with the Boehm titration, Fourier transform infrared spectroscopy, a zeta potential analyzer, and scanning electron microscopy. The results show that with the increase of nitric acid molar concentration, the content of acid functional groups increased, whereas the content of alkali functional groups decreased. At a nitric acid concentration of 10 mol/l, the surface‐modified activated carbon powder displays features such as the highest functional group content and zeta potential value, the smallest particle size, and the best dispersion and suspension stability in the solution. Copyright © 2008 John Wiley & Sons, Ltd.