ORIGINAL RESEARCH
Size Control of Cobalt Oxide Nanoparticles and Its Effect on the Fenton Catalytic Activity
 
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Vaal University of Technology, Private Bag x021 Vanderbijilpark,1900, South Africa
 
 
Submission date: 2020-01-08
 
 
Final revision date: 2020-04-01
 
 
Acceptance date: 2020-04-05
 
 
Online publication date: 2020-07-31
 
 
Publication date: 2020-10-05
 
 
Corresponding author
Elvera Logie Viljoen   

Chemistry, Vaal University of Technology, Andries Potgieter, 1911, Vanderbijlparl, South Africa
 
 
Pol. J. Environ. Stud. 2021;30(1):393-400
 
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ABSTRACT
Cobalt oxide nanoparticles were prepared using a precipitation-oxidation method at mild reaction conditions. The nanoparticles had spherical shapes and sizes that ranged from 4.6 nm to 19.4 nm as determined by TEM and XRD. XRD indicated that the nanoparticles consisted only of the Co3O4 phase. The nanoparticles’ size was controlled using different amounts of the oxidant, hydrogen peroxide. The size was controlled in the absence of capping molecules. The yield increased with an increase in the amount of hydrogen peroxide used. The cobalt oxide nanoparticles were used as catalyst for the Fenton reaction to degrade methylene blue dye by hydrogen peroxide oxidation. The catalytic activity increased with a decrease in particle size. A percentage degradation of 99 % in 30 minutes was obtained when the 4.6 nm sized nanoparticles was used as catalyst. No significant methylene blue degradation was observed in the absence of the catalyst.
eISSN:2083-5906
ISSN:1230-1485
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