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Applicant:
Central University of Tamil Nadu 
Author:
Kadarkarai Govindan, A.K. Suresh, Thangavel Sakthivel, Murugesan Kalpana, Mohan Raja, Gunasekaran Venugopal, Am Jang 
Corresponding Authors:
Kadarkarai Govindan 
DOI #:
10.1016/j.chemosphere.2019.124479  
Title:
Effect of peroxomonosulfate, peroxodisulfate and hydrogen peroxide on graphene oxide photocatalytic performances in methyl orange dye degradation 
Journal:
Chemosphere 
Year:
2019 
Volume:
237 
Page:
124479 
Keywords:
Central composite design, Electron scavenger (ES), Graphene oxide photocatalyst, Hydrogen peroxide 
Abstract:
Carbocatalyst GO photocatalytic mechanism and performances in the presence of an electron scavenger (ES) has been consciously discussed herein. Single layer GO photocatalyst has been synthesized by Hummer's method and photocatalyst characteristics are gathered by different analytical methods. Studies ensured the formation of a good crystalline GO that contains number of oxygenated functional groups, with average crystalline size of the sp2 domain in 18.24 nm. Optical studies suggest that optical band gap of the GO nanosheet photocatalyst is found in the range of 3.19-4.4 eV. TEM analysis confirms the formation of a single layer GO nanosheet. Photocatalytic study justifies that in the absence of ES, 24% mineralization efficiency is achieved with GO as a photocatalyst, whereas in the presence of ES such as PMS, PDS and HP the mineralization efficiency is considerably enhanced up to 91%, 77% and 65% respectively. Moreover, photocatalytic degradation intermediate byproducts were also examined through LC-MS analysis. The study substantiates methyl orange dye degradation undergoes via the multiple degradation pathway such as (i) azo bond cleavage and hydroxylation, (ii), asymmetric cleavage followed by reduction of sulfonate group and aromatic ring removal and (iii) consecutive demethylation reactions 
Entered by:
Gunasekaran Venugopal on 2020-08-29 
 
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