Reactive Black 5 Degradation on Manganese Oxides Supported on Sodium Hydroxide Modified Graphene Oxide

Abstract

Sodium hydroxide-modified graphene oxide was used as manganese oxides support for the preparation of nanocomposites via a one-pot preparation route for the degradation of Reactive Black 5. The nanocomposites were characterized for their structure by X-ray diffraction, for their textural properties by Nitrogen adsorption, and for their surface chemistry by Fourier transform infrared spectroscopy, potentiometric titration, and thermal analysis measurements. The nanocomposites prepared showed to possess high activity for the degradation/oxidation of Reactive Black 5 at ambient conditions, without light irradiation, which was higher than that of the precursors manganese oxides and can be attributed to the synergistic effect of the manganese oxides and the modified graphene oxide.

Graphene-Templated Cobalt Nanoparticle Embedded Nitrogen-Doped Carbon Nanotubes for Efficient Visible-Light Photocatalysis

“…During photocatalytic reactions, the positive holes are the major oxidation species under acidic conditions, as positive holes are used to protonate the photocatalyst surface . As the p K a value of RB5 has been reported to be around 3.8–6.9, it is considered an anionic dye with a negative charge at acidic pH . As a result, in acidic pH, the electrostatic attractions between RB5 and our designed phtocatalysts are maximized, thereby demonstrating the maximum photodegradation efficiency in either case at acidic pH, especially at pH 4.…”

“…The highly electrically conductive graphene is very beneficial to storing and shuttling electrons when it is combined with others, owing to its lower work function (−4.5 eV) . The photocatalytic dye degradation under light basically involves four steps: (a) adsorption of dye molecules over the catalyst surface, (b) light absorption by the photoactive catalyst, (c) generation of electrons and holes in the conduction and valence bands, and (d) formation of highly active radical species, especially peroxide and hydroxide radicals, via charge transfer reactions for degradation of the dye to nontoxic products (CO 2 and H 2 O). , After visible light absorption on the photocatalyst surface, the generated photoactivated electrons are excited from the filled valence band (HOMO–2p bonding orbital of nitrogen) to the lowest unoccupied molecular orbital (LUMO) of Co (conduction band). The process of electron excitation under irradiation of visible light from N to Co leads to the formation of an unstable electron hole pair (eq ), and subsequently photogenerated holes strongly require one electron to regenerate its stability .…”

Augmenting versatile peroxidase production from Lentinus squarrosulus and its role in enhancing ruminant feed

“…The major peak at 3449 cm -1 in Fig. 5A was the cumulative of the OH and NH stretching vibrations indicating the degradation of RB5 in the medium (Saroyan et al 2019). Compared to RB5 oxidation analysis, oxidation of kraft lignin was less emphatic due to the complexity of the structure and duration of the reaction.…”

Innovative Approaches for Drinking- and Waste-Water Treatment: An Editorial Review Summarizing and Assessing the Findings of the Special Issue

“…The second study in this field, [9] used sodium hydroxide-modified graphene oxide to support manganese oxides aiming at the formation of nanocomposites via a one-pot preparation route for the degradation of Reactive Black 5. The nanocomposites were characterized by X-ray diffraction, nitrogen adsorption, Fourier transform infrared spectroscopy, potentiometric titration, and thermal analysis measurements.…”

“…(a) First, there are those that investigate the application of membrane treatment processes, either directly [1] (b) second, there are studies that investigate the application of adsorptive processes for the removal of contaminants from waters, such as arsenic, lead, nickel or chromate [2][3][4][5][6], but also assessed the health effects of their exposure to humans [7]. (c) third, there are studies that include novel aspects of oxidative treatment [8,9] and (d) fourth, studies that examine wastewater treatment efficiency, testing new type reactors [10], minimizing the sewage sludge [11] or energy minimization and conversion and in wastewater treatment facilities [12,13].…”