Bismuth Molybdate Nanoplates Supported on Reduced Graphene Oxide: An Effective Nanocomposite for the Removal of Naphthalene via Adsorption–Photodegradation

Abstract

Polycyclic aromatic hydrocarbons are a class of persistent organic water pollutants that raise serious concerns owing to their carcinogenicity and other negative impacts on humans and ecosystems. In this study, Bi 2 MoO 6 /reduced graphene oxide (rGO) nanocomposites were designed and prepared for the adsorption-assisted photodegradation of naphthalene molecules in an aqueous medium. The synthesized Bi 2 MoO 6 nanoplates and Bi 2 MoO 6 /rGO nanocomposites were characterized by X-ray diffraction, Fourier transform infrared, scanning electron microscopy, high-resolution transmission microscopy, X-ray photoelectron spectroscopy, ultraviolet spectroscopy, Brunauer−Emmett−Teller, and photoluminescence measurements. The photodegradation of naphthalene molecules was observed to assess the photocatalytic characteristics of the samples under visible light. The Bi 2 MoO 6 /rGO nanocomposites exhibited significantly improved photocatalytic efficiency compared to pure Bi 2 MoO 6 . Among the nanocomposites, those containing 2 wt % rGO showed the best photocatalytic activity. The incorporation of rGO enhanced the visible light absorption and decreased the recombination rate of photogenerated charge carriers. Moreover, a Bi 2 MoO 6 /rGO nanocomposite showed excellent reusability for five cycles.

Performance comparison of distinct bismuth molybdate single phases for asymmetric supercapacitor applications

“…7(b), which are attributed to Bi 4f 7/2 and Bi 4f 5/2 , respectively. 45,46 In agreement with the other two, the peaks for Bi 2 Mo 3 O 12 are shifted to 165 eV, signifying the trivalent oxidation state for bismuth (Bi 3+ ). The Mo 3d spectrum in Fig.…”

A well-defined S-g-C3N4/Cu–NiS heterojunction interface towards enhanced spatial charge separation with excellent photocatalytic ability: synergetic effect, kinetics, antibacterial activity, and mechanism insights

“…[1][2][3][4] So far, photocatalysis and adsorption degradation are two of the most favorable and environmentally friendly strategies for eradicating organic dyes in wastewater. 5 Previous studies revealed the amazing construction of a novel photocatalysis system on account of its efficiency, robustness, less expensive and recyclable properties. 6 As one of the most ideal strategies, enhanced visible light harvesting photocatalysis has been extensively reported in the removal of organic dyes and damaging constituents in wastewater owing to its clean and energy-conservation particularities.…”

Graphene-guided growth of rare earth-doped Bi2Mo2O9 nano self-assembly for enhanced asymmetric supercapacitor device performance

“…38 The C 1s peak of GM-Bi 1.9 Gd 0.1 Mo 2 O 9 was much stronger than that of GM-Bi 1.9 Ce 0.1 Mo 2 O 9 centered around 285.3 eV and was due to the CO bond, confirming the residence of residual carbon in the as-synthesized rGO-modified self-assembly. 39…”