Efficient Photoreduction of Hexavalent Chromium Using the Reduced Graphene Oxide–Sm2MoO6–TiO2 Catalyst under Visible Light Illumination

The development of photocatalysts with visible light response is of great significance to cope with energy crisis and environmental remediation. In this study, a visible light-driven photocatalyst reduced graphene oxide/ZnIn2S4 (rGO/ZIS) was prepared by a facile one-pot hydrothermal method. The photocatalyst was used for the degradation of naproxen under visible light illumination and it exhibited remarkably degradation efficiency (nearly 99% within 60 min). The improved photocatalytic degradation performance can be attributed to the enhancement of light adsorption capacity and effective separation of photoinduced electron–hole pairs. The reactive species quenching experiments and EPR measurements demonstrated that superoxide radical (O2−) and hole (h+) play a dominant role in the photocatalytic degradation reactions. In addition, the degradation intermediates were identified and the degradation pathway was suggested.

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Enhanced photocatalytic performance of Nb doped TiO2/reduced graphene oxide nanocomposites over rhodamine B dye under visible light illumination

Sustainable Environment Research ◽

10.1186/s42834-021-00110-x ◽

2021 ◽

Vol 31 (1) ◽

Author(s):

Neradabilli Prabhakarrao ◽

Tirukkovalluri Siva Rao ◽

Kapuganti Venkata Divya Lakshmi ◽

Gorli Divya ◽

Genji Jaishree ◽

...

Keyword(s):

Electron Microscopy ◽

Graphene Oxide ◽

Visible Light ◽

Reduced Graphene Oxide ◽

Rhodamine B ◽

Photocatalytic Performance ◽

Diffuse Reflectance Spectroscopy ◽

Light Exposure ◽

Light Illumination ◽

Reduced Graphene

AbstractThe present study discusses the synthesis of Nb doped TiO2/reduced graphene oxide (rGO) intercalated nanocomposites via sol-gel route at a lower temperature by using different loading amounts of graphene oxide (GO) (1 to 10 wt%). The synthesized composite materials were further characterized by copious instruments such as X-ray Diffractometer, UV-Vis Diffuse Reflectance Spectroscopy, Scanning Electron Microscopy, Transmission Electron Microscopy, Brunauer-Emmett-Teller surface area analysis, Raman and Fourier Transform-Infrared Spectroscopy. The experimental results stated that the Nb doped TiO2 nanoparticles uniformly distributed on the surface of rGO with an interfacial linking bond between TiO2 and rGO. Later, the photocatalytic degradation of Rhodamine B (RhB) dye using produced materials under visible light irradiation was examined. These results revealed that Nb doped TiO2/rGO nanocomposites exhibited better photocatalytic performance than Nb doped TiO2 for the removal of RhB dye. However, among all, the nanocomposite having 5 wt% of GO content achieves the highest degradation efficiency for RhB dye approximately 98% under visible light exposure. Altogether, the unique properties such as electron accepting and transporting properties of GO in the nanocomposite is caused to enhance photocatalytic activity by minimizing the charge carrier’s recombination rate.

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Enhanced Photocatalytic Performance of Nb Doped TiO2/reduced Graphene Oxide Nanocomposites Over Rhodamine B Dye Under Visible Light Illumination

10.21203/rs.3.rs-275142/v1 ◽

2021 ◽

Author(s):

N. Prabhakarrao ◽

K.V. Divya Lakshmi ◽

G. Divya ◽

G. Jaishree ◽

Imandi Manga Raju ◽

...

Keyword(s):

Electron Microscopy ◽

Graphene Oxide ◽

Visible Light ◽

Reduced Graphene Oxide ◽

Rhodamine B ◽

Photocatalytic Performance ◽

Bet Surface Area ◽

Light Illumination ◽

Reduced Graphene ◽

Rhodamine B Dye

Abstract The present study discusses the synthesis of Nb doped TiO2/reduced Graphene Oxide (GO) intercalated nanocomposites via sol-gel route at a lower temperature by using different loading amounts of GO (1 to 10 wt%). The synthesized composite materials were further characterized by copious instruments such as X-ray Diffractometer, UV-vis Diffuse Reflectance Spectroscopy, Scanning Electron Microscopy, Transmission Electron Microscopy, BET surface area analysis, Raman and FT-Infrared Spectroscopy. The experimental results stated that the Nb doped TiO2 nanoparticles uniformly distributed on the surface of reduced Graphene Oxide (rGO) with an interfacial linking bond between TiO2 and rGO. Later, the photocatalytic degradation of Rhodamine B dye using produced materials under visible light irradiations was examined. These results reveal that Nb doped TiO2/rGO nanocomposites exhibited better photocatalytic performance than Nb doped TiO2 for the removal of Rhodamine B dye. However, among all, the nanocomposite having 5% of GO content achieves the highest degradation rate for Rhodamine B dye approximately 98% under visible light exposure. Overall, the unique properties such as electron accepting and transporting properties of GO in the nanocomposites help to enhance photocatalytic activity by minimizing the charge carrier’s recombination rate.

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