Synthesis of Co3O4 @ Organo/Polymeric Bentonite Structures as Environmental Photocatalysts and Antibacterial Agents for Enhanced Removal of Methyl Parathion and Pathogenic Bacteria

Two green nanocomposites of Co 3 O 4 decorated CTAB/bentonite (Co@CT/BE) and chitosan/bentonite (Co@CH/BE) were synthesized as enhanced and environmental photocatalysts and antibacterial agents. As photocatalysts, the products were applied in the effective oxidation of toxic methyl parathion pestici...

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Bibliographic Details
Published in:Journal of inorganic and organometallic polymers and materials 2022-07, Vol.32 (7), p.2600-2614
Main Authors: Abukhadra, Mostafa R., Saad, Islam, Othman, Sarah I., Allam, Ahmed A., Fathallah, Walid
Format: Article
Language:English
Subjects:
Bacteria
Bentonite
Chemical synthesis
Chemistry
Chemistry and Materials Science
Chitosan
Cobalt oxides
Hydroxyl radicals
Inorganic Chemistry
Light sources
Methyl parathion
Mineralization
Nanocomposites
Organic Chemistry
Organic compounds
Oxidation
Oxidation tests
Photocatalysis
Photocatalysts
Polymer Sciences
Wastewater
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Summary:Two green nanocomposites of Co 3 O 4 decorated CTAB/bentonite (Co@CT/BE) and chitosan/bentonite (Co@CH/BE) were synthesized as enhanced and environmental photocatalysts and antibacterial agents. As photocatalysts, the products were applied in the effective oxidation of toxic methyl parathion pesticide (MP) in wastewater under a visible light source. The application of Co@CH/BE (0.02 g) resulted in the complete oxidation of MP (50 mg/L) after 40 min and complete mineralization after 60 min. while the complete oxidation and mineralization of MP (50 mg/L) by Co@CT/BE was recognized after 75 min and 100 min, respectively. The Co@CH/BE composite is of higher activity than Co@CT/BE and can cause complete oxidation for MP at high concentrations up to 100 mg/L after 75 min. The oxidation pathway was illustrated considering the existence of the hydroxyl radicals as the active oxidizing species and the identified secondary organic compounds during the oxidation tests. The detected intermediate converted into end products of CO 2 and inorganic anions of SO 4 −2 , NO 3 − , and PO 4 −3 at the final stages of the oxidation processes. As antibacterial agents, the two composites exhibit considerable inhabitation zones of about 20 mm against both the Gram-positive Staphylococcus aureus and Gram-negative bacterium Vibrio Sp. The synthetic Co@CH/BE showed the best antibacterial properties with 200 μg/mL as minimum inhibitory against Staphylococcus aureus.
ISSN:1574-1443
1574-1451
DOI:10.1007/s10904-022-02346-5