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

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.

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

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.

scholarly journals Synthesis of MgFe2O4/Reduced Graphene Oxide Composite and Its Visible-Light Photocatalytic Performance for Organic Pollution

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Fengmin Wu ◽  
Wenlu Duan ◽  
Mei Li ◽  
Hang Xu
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Photocatalytic Performance ◽  
Light Response ◽  
Organic Pollution ◽  
Reduced Graphene ◽  
Potential Applications ◽  
Electron Hole Pair

Recently, binary metal oxides have been proven to be the most investigated semiconductors due to their high activity for the removal of organic pollutants. In this paper, to improve the photocatalytic efficiency of MgFe2O4, a MgFe2O4/reduced graphene oxide (MFO/rGO) photocatalyst was synthesized by a facile generalized solvothermal method. The morphology, structure, and photocatalytic activities in the degradation of methyl orange (MO) reaction were systematically characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and UV-vis absorption spectroscopy, respectively. The results showed that the MFO/rGO composite exhibited enhanced photocatalytic performance in the photodegradation of MO under visible-light irradiation and reached a maximum degradation rate of 99% within 60 min of irradiation. This excellent photocatalytic performance is attributed to the introduction of rGO in the composite, which can effectively reduce the photoproduction of the electron-hole pair recombination rate. The excellent photocatalytic activity reveals that the MFO/rGO composite photocatalyst is a promising photocatalyst with good visible-light response and has potential applications in the field of water treatment.

Reduced Graphene Oxide Supported Molybdenum Oxide Hybrid Nanocomposites: High Performance Electrode Material for Supercapacitor and Photocatalytic Applications

2020 ◽  
Vol 20 (7) ◽  
pp. 4035-4046
Author(s):  
Rengasamy Dhanabal ◽  
Dhanasekaran Naveena ◽  
Sivan Velmathi ◽  
Arumugam Chandra Bose
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Hybrid Nanocomposites ◽  
X Ray ◽  
Supercapacitor Application ◽  
Quenching Effect ◽  
Reduced Graphene

Using a simple solution based synthesis route, hexagonal MoO3 (h-MoO3) nanorods on reduced graphene oxide (RGO) sheets were prepared. The structure and morphology of resulting RGO-MoO3 nanocomposite were characterized using X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM). The optical property was studied using UV-Visible diffuse reflectance spectroscopy (UV-Vis DRS) and photoluminescence spectroscopy (PL). The RGO-MoO3 nanocomposites were used as an electrode for supercapacitor application and photocatalyst for photodegradation of methylene blue (MB) and rhodamine B (RhB) under visible light irradiation. We demonstrated that the RGO-MoO3 electrode is capable of delivering high specific capacitance of 134 F/g at current density of 1 A/g with outstanding cyclic stability for 2000 cycles. The RGOMoO3 photocatalyst degrades 95% of MB dye within 90 min, and a considerable recyclability up to 4 cycles was observed. The quenching effect of scavengers test confirms holes are main reactive species in the photocatalytic degradation of MB. Further, the charge transfer process between RGO and MoO3 was schematically demonstrated.

Facile synthesis of magnetic Bi25FeO40/rGO catalyst with efficient photocatalytic performance for phenolic compounds under visible light

RSC Advances ◽  
2015 ◽  
Vol 5 (7) ◽  
pp. 4905-4908 ◽  
Author(s):  
Yan Wu ◽  
Hanjin Luo ◽  
Xiaolu Jiang ◽  
Hou Wang ◽  
Junjie Geng
Keyword(s):  
Graphene Oxide ◽  
Phenolic Compounds ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Reduced Graphene Oxide ◽  
Photocatalytic Performance ◽  
Utilization Efficiency ◽  
Facile Synthesis ◽  
Facile Hydrothermal Method ◽  
Reduced Graphene

To improve the utilization efficiency of the Bi25FeO40 catalyst, Bi25FeO40-reduced graphene oxide (rGO) composite photo-catalysts were prepared by a facile hydrothermal method.

scholarly journals Sustainable Recovery of CO2 by Using Visible-Light-Responsive Crystal Cuprous Oxide/Reduced Graphene Oxide

2018 ◽  
Vol 10 (11) ◽  
pp. 4145 ◽  
Author(s):  
Shou-Heng Liu ◽  
Jun-Sheng Lu ◽  
Yi-Chiun Chen
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Cuprous Oxide ◽  
Solution Chemistry ◽  
Diffuse Reflection Spectroscopy ◽  
Enhanced Absorption ◽  
Reduced Graphene

A simple solution-chemistry method has been investigated to prepare crystal cuprous oxide (Cu2O) incorporated with reduced graphene oxide (designated as Cu2O-rGO-x, where x represents the contents of rGO = 1%, 5% and 10%) in this work. These Cu2O-rGO-x composites combine the prospective advantages of rhombic dodecahedra Cu2O together with rGO nanosheets which have been studied as visible-light-sensitive catalysts for the photocatalytic production of methanol from CO2. Among the Cu2O-rGO-x photocatalysts, the methanol yield photocatalyzed by Cu2O-rGO-5% can be observed to be 355.26 μmol g−1cat, which is ca. 36 times higher than that of pristine Cu2O nanocrystal in the 20th hour under visible light irradiation. The improved activity may be attributed to the enhanced absorption ability of visible light, the superior separation of electron–hole pairs, well-dispersed Cu2O nanocrystals and the increased photostability of Cu2O, which are evidenced by employing UV-vis diffuse reflection spectroscopy, photoluminescence, scanning electron microscopy/transmission electron microscopy and X-ray photoelectron spectroscopy, respectively. This work demonstrates an easy and cost-effective route to prepare non-noble photocatalysts for efficient CO2 recovery in artificial photosynthesis.

scholarly journals Incorporation of reduced graphene oxide into faceted flower-like {001} TiO 2 for enhanced photocatalytic activity

2018 ◽  
Vol 5 (8) ◽  
pp. 180613 ◽  
Author(s):  
Haijin Liu ◽  
Peiyao Li ◽  
Haokun Bai ◽  
Cuiwei Du ◽  
Dandan Wei ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Theoretical Calculations ◽  
X Ray ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Photocatalytic Activities

Anatase TiO 2 with {001} facets is much more active than that with {101} facets, which has been verified via experiments and theoretical calculations. Graphene has garnered much attention since it was initially synthesized, due to its unique properties. In this study, reduced graphene oxide (RGO)/{001} faceted TiO 2 composites were fabricated via a solvothermal method. The composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectrophotometry, photoluminescence and Raman analysis. The results revealed that the graphene oxide was reduced during the preparation process of the {001} faceted TiO 2 , and combined with the surface of {001} TiO 2 . The photocatalytic activities of the composites were evaluated through the degradation of basic violet, under both white light ( λ > 390 nm) and visible light ( λ = 420 nm) irradiation. The results indicated that the photocatalytic activities of the {001} faceted TiO 2 were significantly improved following the incorporation of RGO, particularly under visible light irradiation. Theoretical calculations showed that the band structure of the {001} faceted TiO 2 was modified via graphene hybridization, where the separation of photoinduced electron–hole pairs was promoted; thus, the photocatalytic activity was enhanced.

Efficient visible light-driven core–shell-structured ZnS@Ag2S nanoparticles-anchored reduced graphene oxide for the reduction of Cr(vi)

2020 ◽  
Vol 44 (34) ◽  
pp. 14670-14678
Author(s):  
Ziba Mohammadian Fard ◽  
Mozhgan Bagheri ◽  
Sasan Rabieh ◽  
Hassan Zavvar Mousavi
Keyword(s):  
Graphene Oxide ◽  
Charge Transfer ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Photocatalytic Performance ◽  
Core Shell ◽  
Reduced Graphene ◽  
Visible Light Driven ◽  
Ag2s Nanoparticles ◽  
Interfacial Charge

Synthesis of a ZnS@Ag2S/RGO nanocomposite with high photocatalytic performance for the removal of Cr(vi) based on the photo-induced interfacial charge transfer.

scholarly journals Ce2O3/BiVO4 Embedded in rGO as Photocatalyst for the Degradation of Methyl Orange under Visible Light Irradiation

J ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 154-168
Author(s):  
Damian C. Onwudiwe ◽  
Boitumelo M. Phadi ◽  
Opeyemi A. Oyewo
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Methyl Orange ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Reduced Graphene ◽  
Degradation Of Methyl Orange

A p–n heterojunction semiconductor structure composed of Ce3O4 and BiVO4 has been synthesized and then incorporated into reduced graphene oxide (rGO) by the hydrothermal method. The ternary composites were characterized by X-ray diffraction, transmission electron microscopy (TEM), scanning electron microscopy (SEM), electron diffraction spectroscopy (EDS), and UV–vis spectroscopy. The efficiency of the composites as photocatalysts was determined by studying the oxidative degradation of methyl orange in aqueous solution under visible light irradiation. The effect of parameters such as pH, catalyst loading, and concentration of the dye solution was examined in order to determine their influence on the photocatalytic activity of the composites. The composite incorporated into reduced graphene oxide presented the highest percentage (above 90%) in 2 h time, attributed to the effect of the increased surface area. The process of the enhanced photocatalytic activity has been discussed based on the energy band positions of the nanoparticles within the composite.

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