Preparation and Photocatalytic Activities of TiO2-rGO Nanocomposite Catalysts for MB Dye Degradation over Sunlight Irradiation

2018 ◽  
Vol 936 ◽  
pp. 47-52 ◽  
Author(s):  
Chaval Sriwong ◽  
Kittisak Choojun ◽  
Worapol Tejangkura ◽  
Warot Prasanseang
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Transfer Rate ◽  
Acidic Solution ◽  
Dye Degradation ◽  
Sunlight Irradiation ◽  
Charge Transfer Rate ◽  
Reduced Graphene ◽  
Photocatalytic Activities ◽  
Nanocomposite Catalysts

This research aims to investigate photocatalytic activities of titanium dioxide (TiO2) incorporated with reduced graphene oxide (rGO) nanocomposite catalysts. These TiO2-rGO photocatalysts were easily prepared through a direct-mixing of TiO2powder suspended in acidic solution under the different amounts of rGO loading (0.25, 0.50, 0.75 and 1.00 wt%). Then, the obtained TiO2-rGO samples were characterized by a several techniques. The results demonstrated that the crystalline phases of all samples are corresponding to pristine TiO2, whereas the characteristic peaks of rGO in the TiO2-rGO nanocomposites could be observed and also well-confirmed by Raman spectroscopy. TEM results showed that the TiO2nanoparticles were well-combined with rGO nanosheets. Moreover, the photocatalytic activities of all TiO2-rGO photocatalyst samples were evaluated by photodegrading of methylene blue (MB) dye solution under natural sunlight irradiation. The results revealed that all TiO2-rGO nanocatalysts exhibited much higher activity than those of the bare TiO2. The improved photocatalytic activity can be attributed to the presence of rGO nanosheets, leading to the decrease of electron (e-) - hole (h+) recombination of TiO2catalyst, increasing charge transfer rate of electrons and surface-adsorbed amount of MB molecules which enhances the photocatalytic activity.

Photocatalytic Degradation of Methylene Blue over Co-Ag3VO4 under Visible Light Irradiation

2011 ◽  
Vol 335-336 ◽  
pp. 1385-1390 ◽  
Author(s):  
Shuo Wiei Zhao ◽  
Hui Xu ◽  
Hua Ming Li ◽  
Yuan Guo Xu
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Absorption Edge ◽  
Diffuse Reflectance Spectroscopy ◽  
Dye Degradation ◽  
Light Irradiation ◽  
Experimental Conditions ◽  
X Ray

In order to improve the photocatalytic activity, Co was successfully loaded into Ag3VO4 by using impregnation process. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS) and diffuse reflectance spectroscopy (DRS). The XRD and SEM–EDS analyses revealed that Co ion was dispersed on Ag3VO4. The DRS results indicated that the absorption edge of the Co–Ag3VO4 catalyst shifted to longer wavelength. The enhanced photocatalytic activity of Co–Ag3VO4 for Methylene Blue(MB) dye degradation under visible light irradiation was due to its wider absorption edge and higher separation rate of photo-generated electron and holes. In the experimental conditions, it is demonstrated that the MB was effectively degraded by more than 95% within 40 min when the Co–Ag3VO4 catalyst was calcined at 300°C with 1 wt.% Co content.

Photocatalytic Activity of Reduced Graphene Oxide-SnSe Nanohybrids with Efficiency Interface Effect

NANO ◽  
2017 ◽  
Vol 12 (03) ◽  
pp. 1750032 ◽  
Author(s):  
H.-Y. He
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Malachite Green ◽  
Interface Effect ◽  
Solution Ph ◽  
Photodegradation Efficiency ◽  
Reduced Graphene ◽  
Narrow Bandgap ◽  
Photocatalytic Activities

Reduced graphene oxide-SnSe (rGO-SnSe) nanohybrids were synthesized with a solution chemical reaction at room temperature. The nanohybrids were characterized by various techniques for their microstructural and photocatalytic activities in photodegradation of alkaline dye malachite green in the water. The effects of rGO/SnSe ratio, initial solution pH, and H2O2 concentration on the photodegradation efficiency were studied. The SnSe nanocrystallines with nanoscale size and narrow bandgap were formed and uniformly adhered on the rGO surface. Raman analysis confirmed the reduction of GO. The experimental results indicated that the nanohybrids showed excellent sunlight-excited photocatalytic activity in degrading malachite green in the water. Significantly, the nanohybrids showed remarkable photo-Fenton-like catalytic activity. The photodegradation rates of the hybrids were greater than that of SnSe nanoparticles, increased with increasing rGO/SnSe ratio, and related to operation parameters. High photocatalytic activities were ascribed to the efficiency interface effect that was confirmed by the calculations of band energy level and photoconductivity. The TOC measurement further verified the photodegradation results. The nanoparticles and nanohybrids also showed excellent reusability.

scholarly journals Real-time monitored photocatalytic activity and electrochemical performance of an rGO/Pt nanocomposite synthesized via a green approach

RSC Advances ◽  
2020 ◽  
Vol 10 (23) ◽  
pp. 13722-13731 ◽  
Author(s):  
Satish Kasturi ◽  
Sri Ramulu Torati ◽  
Yun Ji Eom ◽  
Syafiq Ahmad ◽  
Byong-June Lee ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Ambient Temperature ◽  
Real Time ◽  
Reduced Graphene Oxide ◽  
Organic Pollutant ◽  
Green Approach ◽  
Reduced Graphene

Herein, we have reported the real-time photodegradation of methylene blue, an organic pollutant, in the presence of sunlight at an ambient temperature using a platinum-decorated reduced graphene oxide (rGO/Pt) nanocomposite.

Comparison of Adsorption Capability and Photocatalytic Activity for Methylene Blue Decomposition of LiInO2 with NaInO2

2006 ◽  
Vol 317-318 ◽  
pp. 819-822
Author(s):  
Jun Hu Wang ◽  
Toru Nonami
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Fine Particles ◽  
Composite Particles ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Co Catalyst ◽  
Photocatalytic Activities ◽  
Adsorption Capability

In the present study, Pt, NiO, and RuO2 fine particles as co-catalyst were loaded on the LiInO2 surface by different methods for enhancing its adsorption capability and photocatalytic activity for methylene blue dye (MB) decomposition. Clear adsorption capability and marked photocatalytic activity for MB decomposition were confirmed on the co-catalyst loaded LiInO2 composite particles. Comparing with that of LiINO2, the previously reported NaInO2 photocatalyst had stronger adsorption capability and higher photocatalytic activity. However, the adsorption capabilities and the photocatalytic activities were separately in the same order of RuO2/AInO2 > Pt/AInO2 > AInO2 > NiO/AInO2 and Pt/LiInO2 > RuO2/LiInO2 > NiO/LiInO2 > LiInO2 for the two promising AInO2 (A = Li+ or Na+) photocatalyst.

rGO–diaminobutane surfaces with optimized N doping and hydrodynamics as dual proton–electron conductors and carbon photocatalysts

2021 ◽  
Vol 45 (1) ◽  
pp. 383-393
Author(s):  
Mohammad Razaul Karim ◽  
Mohammed M. Rahman ◽  
Abdullah M. Asiri
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Water Splitting ◽  
Light Harvesting ◽  
Dye Degradation ◽  
Interlayer Distance ◽  
Organic Hybrid ◽  
Reduced Graphene ◽  
N Doping

A reduced graphene oxide–diaminobutane (rGO–DAB) organic hybrid revealed excellent N doping, flexible interlayer distance, and light-harvesting property to support optimized photocatalytic activity for water splitting and dye degradation.

Hydrothermal Synthesis and Photocatalytic Activities of La-Doped BiVO4 Microcakes

2014 ◽  
Vol 881-883 ◽  
pp. 177-180
Author(s):  
Guo Cong Liu ◽  
Shi Hua Xu ◽  
Yin Jian Liang
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Absorption Band ◽  
Visible Light Irradiation ◽  
Hydrothermal Route ◽  
Monoclinic Crystal ◽  
Photocatalytic Activities ◽  
Template Free ◽  
La Doped

Novel La-doped BiVO4microcakes have been hydrothermally synthesized and characterized by XRD, XPS, SEM, and DRS techniques.The results reveal that the well crystallized and cake-like Bi0.95La0.05VO4monoclinic crystal with the diameter range of 15 μm and the width range of 0.2-0.8 μm can be obtained via a template-free hydrothermal route. Compared with pure BiVO4microcakes, Bi0.95La0.05VO4microcake shows a little red shift in the absorption band, resulting in a narrowed band gap (2.37 eV), which has the better photocatalytic activity with a 98.6 % degradation of methylene blue (MB) with a concentration of 10 mg/L under visible-light irradiation for 60 min.

Dye Degradation Using Ag/ZnO Illuminated by Fluorescent Lamps

2015 ◽  
Vol 749 ◽  
pp. 206-210
Author(s):  
Pongsaton Amornpitoksuk ◽  
Sumetha Suwanboon
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Rhodamine B ◽  
Dye Degradation ◽  
Reactive Orange 16 ◽  
Fluorescent Lamps ◽  
Zno Powders ◽  
Reactive Orange ◽  
Better Than ◽  
Dye Solutions

Heterostructure of Ag/ZnO was synthesized by a reduction of Tollen’s reagent on ZnO powders. The photocatalytic activity of Ag/ZnO was investigated through the degradation of three different dye solutions (methylene blue, rhodamine B and reactive orange 16) under visible light using the fluorescent lamps with a 420 nm longpass filter. The efficiencies of dye degradations for all three dyes by Ag/ZnO are better than that of pure ZnO. Furthermore, the parameters including photocatalyst loadings and initial pHs of dye solutions were also studied. The photocatalytic degradations for all three dyes were increased with the increasing of catalyst loadings. The effect of pHs on photocatalytic activity of Ag/ZnO can be explained by the interaction between the charge on the surface of photocatalyst and the charge of dye ions.

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.

Synthesis of wrinkled graphene hybrids for enhanced visible-light photocatalytic activities

RSC Advances ◽  
2016 ◽  
Vol 6 (51) ◽  
pp. 45617-45623 ◽  
Author(s):  
Hua Xu ◽  
Jian Xin Xiang ◽  
Pin Wu ◽  
Yi Fei Lu ◽  
Shuai Zhang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Activities ◽  
Visible Light Photocatalytic

Wrinkled graphene hybrids were controllable prepared and exhibit enhanced photocatalytic activity in the degradation of methylene blue under visible light.

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