The degradation of bisphenol-A organic pollutant using the dispersal of TiO2 nanorods onto the partial reduction of graphene oxide nanosheets

• Published in: Chemosphere (Oxford) Vol. 342; p. 140143
• Main Authors: Alomairy, Sultan, Gnanasekaran, Lalitha, Rajendran, Saravanan, Alsanie, Walaa F.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-11-2023
• Subjects: Bisphenol-A; Photocatalytic degradation; rGO nanosheets; Semiconducting metal oxides; π–π conjugated interactions; Photocatalytic degradation; rGO nanosheets; Bisphenol-A; π–π conjugated interactions; Semiconducting metal oxides
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2023.140143

The notion of innovative combinations of semiconducting metal oxides for photocatalytic destruction is a key factor in the removal of environmental contaminants. However, for the first time, the combination was made possible for the aforementioned reason by embedding one-dimensional titanium dioxide (TiO2) semiconductor nanorods on two-dimensional rGO (reduced graphene oxide) nanosheets utilizing hydrothermal and a modified Hummers' method. By applying several sophisticated procedures, the properties of these catalysts were found, and then the degradation of BPA (bisphenol-A) was examined with UV and visible light sources. Further, all the analyses were performed on pure TiO2 material. As a result of the synergistic interaction between TiO2 and rGO, the rGO-TiO2 catalyst produced a favorable photocatalytic outcome. The structural investigation of rGO-TiO2 has confirmed that the TiO2 was in anatase phase along with GO and rGO peaks, and the morphological characterization showed that the TiO2 nanorods were integrated randomly into the rGO nanosheets along with defective sites. Also, adding rGO to TiO2 causes charge separation, and π–π interactions to improve the visible light absorption range. In this study, the main model organic component in the photocatalytic degradation is bisphenol-A (BPA). During visible light irradiation, the OH radicals were finally produced by the redox reactions. Furthermore, the rGO surface adsorbs the phenol molecules due to graphene π–π interactions, thus narrowing the band gap and increasing the efficiency of BPA degradation.
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•The rGO- TiO2@Fe3O4 catalyst was synthesized by combined sol-gel, chemical precipitation, and Hummers methods.•The TEM observation confirmed TiO2–Fe3O4 core-shell nanospheres spreaded on the folded 2D-rGO layered nanosheets•The synergistic interactions improved the visible light activity