Immobilised rGO/TiO2 Nanocomposite for Multi-Cycle Removal of Methylene Blue Dye from an Aqueous Medium

This work presents the immobilisation of titanium dioxide (TiO2) nanoparticles (NPs) and reduced graphene oxide (rGO)-TiO2 nanocomposite on glass sheets for photocatalytic degradation of methylene blue (MB) under different radiation sources such as ultraviolet and simulated solar radiation. The TiO2 NPs and rGO-TiO2 nanocomposite were synthesised through a simple hydrothermal method of titanium isopropoxide precursor followed by calcination treatment. Deposition of prepared photocatalysts was performed by spin-coating method. Additionally, ethylene glycol was mixed with the prepared TiO2 NPs and rGO-TiO2 nanocomposite to enhance film adhesion on the glass surface. The photocatalytic activity under ultraviolet and simulated solar irradiation was examined. Further, the influence of different water matrices (milli-Q, river, lake, and seawater) and reactive species (h+, •OH, and e−) on the photocatalytic efficiency of the immobilised rGO/TiO2 nanocomposite was careful assessed. MB dye photocatalytic degradation was found to increase with increasing irradiation time for both irradiation sources. The immobilisation of prepared photocatalysts is very convenient for environment applications, due to easy separation and reusability, and the investigated rGO/TiO2-coated glass sheets demonstrated high efficiency in removing MB dye from an aqueous medium during five consecutive cycles.

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OVAT DEGRADATION ANALYSIS OF METHYLENE BLUE USING RICE HUSK ASH (AGRO-WASTE) BASED CATALYST IN SOLAR IRRADIATION

JOURNAL OF THE NIGERIAN SOCIETY OF CHEMICAL ENGINEERS ◽

10.51975/21360201.som ◽

2021 ◽

Vol 36 (2) ◽

pp. 1-9

Author(s):

O.O Okeniyi ◽

O.A Adekunle ◽

O. A AJAYI ◽

T.K BELLO ◽

S.O Okeniyi ◽

...

Keyword(s):

Methylene Blue ◽

Photocatalytic Degradation ◽

Active Sites ◽

Irradiation Time ◽

Industrial Applications ◽

Solar Irradiation ◽

Blue Dye ◽

Methylene Blue Dye ◽

Sunlight Irradiation ◽

The One

This study investigated the degradation of methylene blue dye with ZnO-CuO/RHA, a synthesised agro waste-based photocatalyst under solar irradiation at ambient temperature. Preliminary screening of the methylene blue degradation facilitated the selection of the best ZnO-CuO/RHA combination. The photocatalytic degradation was done by taking varying weights of catalyst in 100 mL of dissolved 10-30 ppm MB solutions. The sample was magnetically stirred at 500 rpm in darkness before being exposed to sunlight irradiation. The suspension was magnetically stirred continuously and 5 ml was withdrawn intermittently, centrifuged and analysed with UV-Vis spectrophotometer. The effect of catalyst dosage, initial concentration and irradiation time on the photodegradation were studied using the one-variable-at-a-time method. The result showed that the degradation percentages of the catalyst with 1, 2, 3, 4, and 5 wt. % of RHA were 80.31%, 88.23%, 99.94%, 91.06 % and 81.12% respectively after 180 minutes. These results showed that degradation percentage was directly proportional to the irradiation time up to 3 wt. % thereafter, there was a decline in the percentage degradation. Hence, as the irradiation time increases, there was a significant increase in the degradation of methylene blue dye. ZnO-CuO/RHA catalyst was found to possess a higher photocatalytic activity in the presence of sunlight in comparison to bare ZnO-CuO since using RHA as a base for ZnO-CuO increased the surface area resulting in more active sites under visible light irradiation. ZnO-CuO/RHA may serve as an efficient-photocatalyst for industrial applications with excellent prospects. Keywords: Photocatalytic degradation, Sunlight irradiation, One-variable-at-a-time

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Preliminary Study of Photocatalytic Degradation of Methylene Blue Dye using Magnetic Alginate/Fe3O4 (Alg/Fe3O4) Nanocomposites

Eksakta Jurnal Ilmu-Ilmu MIPA ◽

10.20885/eksakta.vol19.iss1.art3 ◽

2019 ◽

Vol 19 (1) ◽

pp. 26-34

Author(s):

Ganjar Fadillah ◽

Muhamad Allan Serunting

Keyword(s):

Electron Microscopy ◽

Methylene Blue ◽

Irradiation Time ◽

Average Diameter ◽

Molar Ratio ◽

Blue Dye ◽

Natural Polymers ◽

Transmission Electron ◽

Coating Method ◽

Preliminary Study

The Magnetic compound, Fe3O4, is one of the compounds that is easily hydrolyzed and oxidized. A coating method was presented in this study to prevent the process. The modifications of Fe3O4 were carried out by supporting alginate as natural polymers on the surface of Fe3O4. Preparation of magnetic alginate/Fe3O4 (Alg/Fe3O4) nanocomposite has been successfully synthesized. Alg/Fe3O4 material was synthesized using the coprecipitation method with Fe2+; Fe3+ (with molar ratio 1:2) and alginate 1% as precursors. Synthesized Alg/Fe3O4 nanoparticles were characterized by Fourier Transform Infrared Spectroscopy (FTIR), DelsaTM Nano C Particle Analyzer, Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), and Energy Dispersive Spectroscopy (EDS). The Alg/Fe3O4 has an average diameter of 13.70 nm. Photodegradation test of synthetic methylene blue (MB) dye was found at pH 5.0 and irradiation time under UV245 for 60 minutes. The degradation results showed that the percentage of MB dye removal reached more than 90%.

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Cu2O nanoparticles for adsorption and photocatalytic degradation of methylene blue dye from aqueous medium

Environmental Nanotechnology Monitoring & Management ◽

10.1016/j.enmm.2019.100265 ◽

2019 ◽

Vol 12 ◽

pp. 100265 ◽

Cited By ~ 4

Author(s):

V Kangralkar Mrunal ◽

A Kangralkar Vishnu ◽

Naeemakhtar Momin ◽

Jayappa Manjanna

Keyword(s):

Methylene Blue ◽

Photocatalytic Degradation ◽

Aqueous Medium ◽

Blue Dye ◽

Methylene Blue Dye ◽

Cu2o Nanoparticles

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Effect of Calcination Temperature on Synthesis of N-Fe-TiO2 for Photocatalytic Degradation of Methylene Blue under Visible Light

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.575.55 ◽

2014 ◽

Vol 575 ◽

pp. 55-59 ◽

Cited By ~ 3

Author(s):

Arman Sikirman ◽

Jagannathan Krishnan

Keyword(s):

Methylene Blue ◽

Visible Light ◽

Photocatalytic Degradation ◽

Calcination Temperature ◽

Irradiation Time ◽

Titanium Isopropoxide ◽

Spherical Particles ◽

Sem Image ◽

Calcination Temperatures ◽

Sem Image Analysis

Effect of calcination temperature on the synthesis of N, Fe codoped TiO2 for the photodegradation of methylene blue under ordinary visible lamps was investigated. The photocatalyst were prepared using solgel method where titanium isopropoxide was used as precursor of titania. The calcination temperatures were varied from 450 to 600°C. The prepared photocatalysts were characterized by using XRD, FE-SEM and FTIR to determine their physical properties. The results from XRD proved that photocatalysts calcined at 600°C possessed perfect properties in phase and crystal size. FE-SEM image analysis revealed the formation of the fine spherical particles and the FTIR analysis verified the presence of dopants at various calcination temperatures. The effectivity of photocatalysts was tested by performing a standard batch photocatalytic degradation experiment with methylene blue as a model pollutant under ordinary visible light. The result showed that N and Fe codoped photocatalyst calcined at 600°C (1.0 % N, Fe-TiO2-600) yielded a maximum of 80.50% methylene blue degraded within five hours of irradiation time.

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Preliminary Study of Photocatalytic Degradation of Methylene Blue Dye using Magnetic Alginate/Fe3O4 (Alg/Fe3O4) Nanocomposites

Eksakta Jurnal Ilmu-Ilmu MIPA ◽

10.20885/10.20885/eksakta.vol19.iss1.art3 ◽

2019 ◽

Vol 19 (1) ◽

pp. 26-34

Author(s):

Ganjar Fadillah ◽

Muhamad Allan Serunting

Keyword(s):

Electron Microscopy ◽

Methylene Blue ◽

Irradiation Time ◽

Average Diameter ◽

Molar Ratio ◽

Blue Dye ◽

Natural Polymers ◽

Transmission Electron ◽

Coating Method ◽

Preliminary Study

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Straightforward Synthesis of Mn3O4/ZnO/Eu2O3-Based Ternary Heterostructure Nano-Photocatalyst and Its Application for the Photodegradation of Methyl Orange and Methylene Blue Dyes

Molecules ◽

10.3390/molecules26154661 ◽

2021 ◽

Vol 26 (15) ◽

pp. 4661

Author(s):

Jayachamarajapura Pranesh Shubha ◽

Haralahalli Shivappa Savitha ◽

Syed Farooq Adil ◽

Mujeeb Khan ◽

Mohammad Rafe Hatshan ◽

...

Keyword(s):

Methylene Blue ◽

Methyl Orange ◽

Irradiation Time ◽

Solar Irradiation ◽

Anionic Dyes ◽

One Pot ◽

Sunlight Irradiation ◽

Ft Ir ◽

Degradation Activity ◽

Ecological Applications

Zinc oxide-ternary heterostructure Mn3O4/ZnO/Eu2O3 nanocomposites were successfully prepared via waste curd as fuel by a facile one-pot combustion procedure. The fabricated heterostructures were characterized utilizing XRD, UV–Visible, FT-IR, FE-SEM, HRTEM and EDX analysis. The photocatalytic degradation efficacy of the synthesized ternary nanocomposite was evaluated utilizing model organic pollutants of methylene blue (MB) and methyl orange (MO) in water as examples of cationic dyes and anionic dyes, respectively, under natural solar irradiation. The effect of various experimental factors, viz. the effect of a light source, catalyst dosage, irradiation time, pH of dye solution and dye concentration on the photodegradation activity, was systematically studied. The ternary Mn3O4/ZnO/Eu2O3 photocatalyst exhibited excellent MB and MO degradation activity of 98% and 96%, respectively, at 150 min under natural sunlight irradiation. Experiments further conclude that the fabricated nanocomposite exhibits pH-dependent photocatalytic efficacy, and for best results, concentrations of dye and catalysts have to be maintained in a specific range. The prepared photocatalysts are exemplary and could be employed for wastewater handling and several ecological applications.

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