Deep Eutectic Solvent-Mediated Synthesis of Ni3V2O8/N-Doped RGO for Visible-Light-Driven H2 Evolution and Simultaneous Degradation of Dyes

Abstract

Photochemical hydrogen evolution and the degradation of synthetic dyes in water are the two key ways to unravel the issues associated with the energy and environmental sectors for sustainability. The present work deals with the use of a deep eutectic solvent for the synthesis of Ni3V2O8/N-doped reduced graphene oxide (NiV/NR hybrid). The NiV/NR hybrid, NRGO, and NiV were characterized using XRD, SEM, TEM, UV-DRS, XPS, and other photo-electrochemical techniques. The NiV/NR hybrid exhibited high efficiency towards light-driven hydrogen evolution (12,546 µmol)) compared to pristine NiV (6453 µmol) and NRGO (1935 µmol). Among the various sacrificial agents examined, TEOA showed better activity in H2 evolution. The photocatalytic degradation of anionic (Methyl orange; MO) and cationic dyes (crystal violet; CV) were evaluated and the reaction conditions were carefully optimized to attain the utmost efficiency. The efficiency of the NiV/NR hybrid was higher under visible light irradiation than UV light and able to degrade 94.6 and 96.7% of MO and CV, respectively. The results of the simultaneous degradation of dyes and total organic carbon (TOC) removal were good. Based on the obtained bandgap and Mott–Schottky plots, the mechanism of photocatalysis in the NiV/NR hybrid is discussed in detail. The reusability and stability of the NiV/NR hybrid in both H2 evolution experiments and degradation studies are excellent. The fabricated NiV/NR hybrid material could be used for multiple applications in energy and environmental applications.

Sn(IV)porphyrin-Anchored TiO2 Nanoparticles via Axial-Ligand Coordination for Enhancement of Visible Light-Activated Photocatalytic Degradation

“…Finally, all these intermediate molecules were further disintegrated and mineralized into CO 2 and H 2 O. Furthermore, the total organic carbon (TOC) was estimated to calculate the removal of RhB dye by the photocatalysts [71]. The TOC removal percentage obtained with SnP/AA@TiO 2 was only 81%.…”

Nanocomposites for Photocatalysis

“…The researchers employed a deep eutectic solvent to synthesize a novel material, the Ni 3 V 2 O 8 /N-doped reduced graphene oxide hybrid (NiV/NR), abbreviated to NRGO. The synthesized NiV/NR hybrid, along with NRGO and pristine NiV, underwent extensive characterization using techniques such as XRD, SEM, TEM, UV-DRS, XPS, and various photo-electrochemical methods [10].…”

Green Synthesis of Nanoparticles Mediated by Deep Eutectic Solvents and Their Applications in Water Treatment

“…Figure 5d shows that M-GO-γ-MPS was surrounded by a gray and semitransparent liquid, possibly due to the surrounding DES layer. On the other hand, GO nanosheets have also been doped with ZnO and Ni 3 V 2 O 8 for the photocatalytic degradation of cefixime trihydrate (CFX) [62], and anionic (MB, MO) and cationic dyes (crystal violet (CV)) [63], respectively. For instance, the optimal CFX photo-degradation efficiency reached 86% with a catalyst dose of 0.532 g L −1 , an initial CFX concentration of 20.13 mg L −1 , and a pH of 4.03, under UVA irradiation.…”