Exfoliated graphite/Selenium-Zinc Oxide Nanocomposites for Photodegradation of Organic Dye in Water and Its Antibacterial Activity Against Aater Borne Pathogens
الموضوعات : Journal of Nanoanalysis
Olubori Idowu Sonde
1
(Department of Chemistry, Federal University of Agriculture Abeokuta, Ogun State, Nigeria|Department of Applied Chemistry, University of Johannesburg, Doornfontein 2028, South Africa)
Moses Gbenga Peleyeju
2
(Department of Applied Chemistry, University of Johannesburg, Doornfontein 2028, South Africa)
Fatai Oladipupo Oladoyinbo
3
(Department of Chemistry, Federal University of Agriculture Abeokuta, Ogun State, Nigeria)
Adejare Rasaq Oloyede
4
(Biotechnology Centre, Federal University of Agriculture Abeokuta, Ogun State, Nigeria)
Tajudeen Adeniyi Afolabi
5
(Department of Chemistry, Federal University of Agriculture Abeokuta, Ogun State, Nigeria)
Hameed Adekola Adesokan
6
(Department of Chemistry, Federal University of Agriculture Abeokuta, Ogun State, Nigeria)
Omotayo Ademola Arotiba
7
(Department of Applied Chemistry, University of Johannesburg, Doornfontein 2028, South Africa|Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein 2028, South Africa)
Enoch Olugbenga Dare
8
(Department of Chemistry, Federal University of Agriculture Abeokuta, Ogun State, Nigeria)
الکلمات المفتاحية: nanocomposite, Methylene Blue, Photocatalyst, Photodegradation, Graphite, Selenium-Zinc oxide,
ملخص المقالة :
We report the synthesis and application of a novel Exfoliated graphite/Selenium-Zinc oxide (EG/Se-ZnO) nanocomposite for photodegradation of methylene blue dye and its antibacterial activity. The composite was characterized using XRD, FTIR, SEM and TEM. Applicability of EG/ Se-ZnO nanocomposite as photocatalyst was investigated by the photocatalytic degradation of methylene blue as a model for organic pollutant. The XRD has its highest peak at 101 which indicated that ion diffusion was free from solvent viscosity (peak at 002). FTIR spectra confirmed the formation of EG/Se-ZnO nanocomposite as band at 882 cm-1 and 612 cm-1, 727 cm-1, 1373 cm-1 were associated with vibrational frequency of ZnO lattice and Selenium respectively. The SEM revealed cloudy large particles of the synthesized EG/Se-ZnO composite. TEM image revealed mini-rodlike nanoparticles. 99.5% degradation of methylene blue dye was achieved within 90 minutes of irradiation. The reactions followed first order kinetics with the rate constant of 5.79x10 -2 min-1 and R2 value of 0.9. The enhanced photocatalytic activity of EG/Se-ZnO was ascribed to the capability of graphitic layers to accept and transport electrons from the excited ZnO promoting charge separation. The antibacterial activity was also evaluated for the ZnO (bulk) and EG/Se-ZnO nanocomposite against the control (ciprofloxacin) and zone of inhibition observed was on E. coli and E.cloacae respectively depicted that EG/Se-ZnO was more effective on E. coli relatively to bulk ZnO. Thus, EG/Se-ZnO nanocomposite can be used for photocatalytic organic pollutant degradation.
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