Photocatalytic degradation of methyl orange dye in water solutions in the presence of MWCNT/TiO2 composites

Dalt, Silvana Da; Alves, Annelise Kopp; Bergmann, Carlos Pérez

doi:10.1016/j.materresbull.2013.01.022

Cited by 88 publications

(29 citation statements)

References 26 publications

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“…Advances have been made in the recovery of contaminated industrial effluents by heterogeneous photocatalysis; much research is still being conducted on this subject . In this context, TiO 2 nanostructures are one of the most common photocatalysts used for the degradation of organic compounds and are employed for their unique physicochemical properties ,.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis by Peroxide Method and Microwave‐Assisted Hydrothermal Treatment of TiO₂ with High Photocatalytic Efficiency for Dye Degradation and Hydrogen Production

García

Guaglianoni

Garcia³

et al. 2018

ChemistrySelect

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Nanostructured titanium dioxide with high photocatalytic efficiency was synthesised by the oxidant peroxide method and microwave‐assisted hydrothermal treatment without calcination or doping. The influence of pH during hydrothermal treatment was investigated on the morphology, crystallinity, phase composition, specific surface area, photoluminescence properties, and photocatalytic behaviour. The pH of the medium had no significant effect on the nanostructured titanium dioxide morphologies but at higher pH, the powders presented lower surface area and higher particle size. A slight decrease in the photoluminescence intensity of the sample prepared at low pH was related to surface protonation. This material also exhibited higher photocatalytic performance in degrading methyl orange solutions than those obtained at a higher pH or commercial TiO2. Aditionally, the hydrogen production rate increased with the solution pH following heat treatment, with optimized results in deionized water. Finally, the powders did not require either heat treatment or doping with another metal to achieve more activity than the commercially available oxide.

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Section: Introductionmentioning

confidence: 99%

Facile Synthesis by Peroxide Method and Microwave‐Assisted Hydrothermal Treatment of TiO₂ with High Photocatalytic Efficiency for Dye Degradation and Hydrogen Production

García

Guaglianoni

Garcia³

et al. 2018

ChemistrySelect

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“…Today's advances in nano-science and nanotechnology make possible the use of nanomaterials to develop more cost effective and environmentally acceptable water purification processes [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Atout

Álvarez

Chebli

et al. 2017

Materials Research Bulletin

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Highlights• TiO2-RGO nanocomposites presented, in all the cases studied, improved photocatalytic properties compared to bare TiO2.• An optimal composition, in terms of TiO2/RGO ratio was found in both series of nanocomposites; however, superior activity was found for those prepared by direct sol-gel route.• Nanocomposites prepared by sol-gel method presented improved textural properties than those prepared following a hydrothermal route.• Optimization in the preparation of hybrid photocatalystsis needed to obtain materials with finer properties for effective application in environmental AbstractIn this study, two different preparation methods of titanium dioxide nanoparticles/reduced graphene oxide nanocomposites were investigated using direct sol-gel method followed by 3 hydrothermal treatment or simple hydrothermal route. A different amount of graphene (1-20%) was mixed with TiO2 for both series of samples in order to improve the photocatalytic activity. The influence of the preparation method on the physico-chemical properties was established by different characterization methods and the photocatalytic degradation of methylene blue (MB) under UV light irradiation was used as test reaction. The highest photocatalytic activity was observed for the nanocomposites containing 10 wt% of graphene.The elimination of MB can reach 93% and 82% for the nanocomposites with 10 wt% graphene prepared by the sol-gel and hydrothermal methods, respectively. These photocatalysts are promising for practical application in nanotechnology.

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“…On the other hand, 60% of decolorization was obtained at 60 min using pure ferrite. The significant enhancement in catalytic activity by the NiFe 2 O 4 / MWCNTs composite can be attributed to the synergistic effect between NiFe 2 O 4 and MWNTs that reduce the rate of recombination of photoinduced electrons and holes, leading to high catalytic performance 13,30 . In addition, the higher surface area and pore volume of NiFe 2 O 4 /MWCNTs composite compared to the pure NiFe 2 O 4 could offer a larger contact and diffusion of dye molecules within the pores of its particles, contributing to the close contact between the HO• radicals and dye molecules, which leads to an increasing reaction rate.…”

Section: Photo-fenton Experimentsmentioning

confidence: 99%

Preparation of Nickel Ferrite/Carbon Nanotubes Composite by Microwave Irradiation Technique for Use as Catalyst in Photo-Fenton Reaction

et al. 2017

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Nickel ferrite/multi-walled carbon nanotubes (NiFe 2 O 4 /MWCNTs) composite has been rapidly synthesized via microwave irradiation technique. The structural properties of the product was investigated by X-ray diffraction (XRD), N 2 adsorption/desorption isotherms, thermogravimetric analysis (TGA), Raman spectroscopy and, scanning electron microscopy (SEM). Catalytic behavior of the composite material on the advanced photo-Fenton degradation of Amaranth dye was evaluated. The synthesis conditions employed on the microwave system were: temperature (235 °C), power (500 W), pressure (600 psi) and irradiation time (30 min). Characterization results showed the formation of hybrid material, containing a predominantly microporous structure, with surface area and total pore volume of 54 m 2 g -1 and 0.2249 cm 3 g -1 , respectively. The composite exhibited higher catalytic activity compared to the pure NiFe 2 O 4 , reaching 100% of decolorization at 60 min of reaction, which can be attributed to a synergism between NiFe 2 O 4 and MWCNTs. Therefore, NiFe 2 O 4 /MWCNTs composite can be used as a promising photo-Fenton catalyst to degrade Amaranth dye from aqueous solutions.

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Photocatalytic degradation of methyl orange dye in water solutions in the presence of MWCNT/TiO2 composites

Cited by 88 publications

References 26 publications

Facile Synthesis by Peroxide Method and Microwave‐Assisted Hydrothermal Treatment of TiO₂ with High Photocatalytic Efficiency for Dye Degradation and Hydrogen Production

Facile Synthesis by Peroxide Method and Microwave‐Assisted Hydrothermal Treatment of TiO₂ with High Photocatalytic Efficiency for Dye Degradation and Hydrogen Production

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Preparation of Nickel Ferrite/Carbon Nanotubes Composite by Microwave Irradiation Technique for Use as Catalyst in Photo-Fenton Reaction

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Photocatalytic degradation of methyl orange dye in water solutions in the presence of MWCNT/TiO2 composites

Cited by 88 publications

References 26 publications

Facile Synthesis by Peroxide Method and Microwave‐Assisted Hydrothermal Treatment of TiO2 with High Photocatalytic Efficiency for Dye Degradation and Hydrogen Production

Facile Synthesis by Peroxide Method and Microwave‐Assisted Hydrothermal Treatment of TiO2 with High Photocatalytic Efficiency for Dye Degradation and Hydrogen Production

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Preparation of Nickel Ferrite/Carbon Nanotubes Composite by Microwave Irradiation Technique for Use as Catalyst in Photo-Fenton Reaction

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Facile Synthesis by Peroxide Method and Microwave‐Assisted Hydrothermal Treatment of TiO₂ with High Photocatalytic Efficiency for Dye Degradation and Hydrogen Production

Facile Synthesis by Peroxide Method and Microwave‐Assisted Hydrothermal Treatment of TiO₂ with High Photocatalytic Efficiency for Dye Degradation and Hydrogen Production