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

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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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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Zirconium-Doped Chromium IV Oxide Nanocomposites: Synthesis, Characterization, and Photocatalysis towards the Degradation of Organic Dyes

Catalysts ◽

10.3390/catal11010117 ◽

2021 ◽

Vol 11 (1) ◽

pp. 117

Author(s):

Zahir Muhammad ◽

Farman Ali ◽

Muhammad Sajjad ◽

Nisar Ali ◽

Muhammad Bilal ◽

...

Keyword(s):

Methylene Blue ◽

Photocatalytic Activity ◽

Methyl Orange ◽

Solid State ◽

Room Temperature ◽

Organic Dyes ◽

Uv Light ◽

Heterogeneous Photocatalysis ◽

Ft Ir ◽

Complete Mineralization

Degradation of organic dyes and their byproducts by heterogeneous photocatalysts is an essential process, as these dyes can be potentially discharged in wastewater and threaten aquatic and xerophyte life. Therefore, their complete mineralization into nontoxic components (water and salt) is necessary through the process of heterogeneous photocatalysis. In this study, Zr/CrO2 (Zirconium-doped chromium IV oxide) nanocomposite-based photocatalysts with different compositions (1, 3, 5, 7 & 9 wt.%) were prepared by an environmentally friendly, solid-state reaction at room temperature. The as-prepared samples were calcined under air at 450 °C in a furnace for a specific period of time. The synthesis of Zr/CrO2 photocatalysts was confirmed by various techniques, including XRD, SEM, EDX, FT-IR, UV-Vis, and BET. The photocatalytic properties of all samples were tested towards the degradation of methylene blue and methyl orange organic dyes under UV light. The results revealed a concentration-dependent photocatalytic activity of photocatalysts, which increased the amount of dopant (up to 5 wt.%). However, the degradation efficiency of the catalysts decreased upon further increasing the amount of dopant due to the recombination of holes and photoexcited electrons.

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Linear polymeric ionic liquids as phase-transporters for both cationic and anionic dyes with synergic effects

Polymer Chemistry ◽

10.1039/c5py01123j ◽

2015 ◽

Vol 6 (39) ◽

pp. 7060-7068 ◽

Cited By ~ 7

Author(s):

Hualei Zhao ◽

Yanting Yu ◽

Zonghao Li ◽

Bin Luo ◽

Xinhang Wang ◽

...

Keyword(s):

Methylene Blue ◽

Ionic Liquids ◽

Methyl Orange ◽

Cationic Dye ◽

Anionic Dyes ◽

Polymeric Ionic Liquids ◽

Anionic Dye

Linear polymeric ionic liquids were synthesized and demonstrated to be very effective transporters for both anionic dye methyl orange (MO) and cationic dye methylene blue (MB) from water to chloroform individually as well as simultaneously.

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Degradation of cationic and anionic dyes in coagulation–flocculation process using bi-functionalized silica hybrid with aluminum-ferric as auxiliary agent

RSC Advances ◽

10.1039/c5ra01346a ◽

2015 ◽

Vol 5 (43) ◽

pp. 34206-34215 ◽

Cited By ~ 59

Author(s):

Yen-Yie Lau ◽

Yee-Shian Wong ◽

Tjoon-Tow Teng ◽

Norhashimah Morad ◽

Mohd Rafatullah ◽

...

Keyword(s):

Methylene Blue ◽

Methyl Orange ◽

Cationic Dye ◽

Functionalized Silica ◽

Anionic Dyes ◽

Methyl Orange Degradation ◽

Anionic Dye ◽

Coagulation Process ◽

Flocculation Process ◽

Silica Hybrid

Cationic dye (methylene blue) and anionic dye (methyl orange) degradation in the coagulation process was demonstrated.

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Synthesis and Application of Novel Coal Fly Ash Supported C-Doped TiO2-SnO2 Photocatalytic Nanocomposite for the Removal of Dyes in Water

Asian Journal of Chemistry ◽

10.14233/ajchem.2020.22972 ◽

2020 ◽

Vol 32 (12) ◽

pp. 3239-3248

Author(s):

S. Sambakanya ◽

P. Nyamukamba ◽

D.M. Katwire ◽

H.H. Mungondori ◽

P. Mukumba ◽

...

Keyword(s):

Methylene Blue ◽

Fly Ash ◽

Methyl Orange ◽

Uv Light ◽

Sno2 Nanoparticles ◽

Coal Fly Ash ◽

Sol Gel ◽

Carbon Doping ◽

Solar Irradiation ◽

Removal Efficiencies

Herein, the preparation, characterization and applications of novel carbon doped titanium dioxide and tin oxide nanocomposite supported on coal fly ash (C-TiO2-SnO2/CFA) are reported. The nanocomposite nanoparticles were successfully synthesized by a sol-gel method and calcined at 550 ºC. XRD analysis showed that SnO2 nanoparticles were polycrystalline in nature and TiO2 had both anatase and rutile phases. Diffuse reflectance spectra showed that carbon doping reduced the band gap of TiO2 from 3.19 eV to 2.78 eV. The nanoparticles′ photocatalytic activity was evaluated using methyl orange and methylene blue dyes, under both UV light and solar irradiation at different pH, pollutant concentration and photocatalyst loading. High photodegradation rates of methyl orange were achieved under visible light. The optimum loading of composite photocatalyst was 0.4 g with removal efficiencies of 97.75% for methyl orange and 99.25% for methylene blue after 3 h. High removal efficiencies were achieved for methyl orange at pH 3 and for methylene blue at pH 10.

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Fabrication of Visible Light Active Mn-Doped Bi2WO6-GO/MoS2 Heterostructure for Enhanced Photocatalytic Degradation of Methylene Blue

10.21203/rs.3.rs-438176/v1 ◽

2021 ◽

Author(s):

Noor Tahir ◽

Muhammad Zahid ◽

Ijaz Ahmad Bhatti ◽

Yasir Jamil

Keyword(s):

Methylene Blue ◽

Visible Light ◽

Visible Region ◽

The Novel ◽

Electron Hole ◽

Co Catalyst ◽

Sunlight Irradiation ◽

Visible Light Active ◽

Ft Ir ◽

Mn Doped

Abstract The increase in environmental pollution has led to an increased investigation in the development of novel ternary photocatalytic systems for remediation. These Photocatalytic systems exhibit superior photocatalytic action for the removal of pollutants because of their visible light active bandgaps. A highly effective visible light active ternary heterojunction was fabricated using a hydrothermal method assisted by ultrasonication. Herein, we report the Insitu hydrothermal synthesis of Mn-doped Bi2WO6-GO/ MoS2 photocatalyst, efficiently exhibiting greater photocatalytic activity for the wastewater treatment under solar light. The binary metal sulphide (MoS2) used as a co-catalyst, acted as electron collector and Graphene oxide (GO) as a support material for interfacial electron transfer to and from bismuth tungstate and MoS2. The as-prepared samples were characterized using SEM-EDX, FT-IR, XRD, XPS, and UV–Vis techniques. The bandgap of the novel photocatalyst was found in the visible region (2.2 eV) which helped in suppressing photoinduced electron-hole pairs recombination. The ternary Mn-BMG showed 99% methylene blue removal after 60 minutes of sunlight irradiation at the optimum conditions of pH 8, catalyst dose 50 mg/100ml and initial MB concentration of 10ppm under sunlight irradiation. The Mn-BMG has proved to be an effective sunlight active photocatalyst that can be reused without substantial loss in photocatalytic efficiency.

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Synthesis, Characterization and Methyl Orange Degradation Activity of Ti-Al Oxides Nanomaterial

Material Science Research India ◽

10.13005/msri/160308 ◽

2019 ◽

Vol 16 (3) ◽

pp. 252-260 ◽

Cited By ~ 1

Author(s):

Buzuayehu Abebe ◽

H C Ananda Murthy

Keyword(s):

Methyl Orange ◽

Analytical Techniques ◽

Reaction Rate Constant ◽

Degradation Efficiency ◽

Impregnation Method ◽

Methyl Orange Degradation ◽

Ft Ir ◽

Degradation Activity ◽

Size Of Particles ◽

Xrd Patterns

The present work reports the synthesis of Ti-Al Oxides (TAOs) nanomaterial by an organic solvent-free impregnation method. The as-prepared products were studied by XRD, SEM-EDAX, UV-Vis, and FT-IR analytical techniques. XRD patterns revealed the fact that both TiO2 (TO)and TAOs exhibited almost similar peaks with the exception to minor peak difference in width and height which could be attributed to the alteration in the size of particles. At the calcination temperature of 500 oC, the absence of peaks for Al2O3 (AO) in the TAOs XRD pattern indicates the amorphous nature of AO. However, the appearance of Ti, Al, and O on EDAX and redshift on UV-Vis spectra confirm the successful impregnation of AO on TO. The pollutant degradation ability of TAOs photocatalyst was tested on methyl orange (MO) dye. Compared to pure TO, TAO composite has greater degradation efficiency. However, as the percentage of AO increases the degradation efficiency decreases. The conducted Langmuir model test was found to fit well for the photocatalytic reaction process following first-order reaction kinetics. Comparing the values for kinetics constant with earlier work, this work showed good MO degradation efficiency with reaction rate constant (k) values of 0.023.

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

Applied Sciences ◽

10.3390/app12010385 ◽

2021 ◽

Vol 12 (1) ◽

pp. 385

Author(s):

Martina Kocijan ◽

Lidija Ćurković ◽

Igor Bdikin ◽

Gonzalo Otero-Irurueta ◽

María J. Hortigüela ◽

...

Keyword(s):

Methylene Blue ◽

Photocatalytic Degradation ◽

Aqueous Medium ◽

High Efficiency ◽

Irradiation Time ◽

Titanium Isopropoxide ◽

Solar Irradiation ◽

Blue Dye ◽

Tio2 Nps ◽

Coating Method

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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Optimization of Alachlor Photocatalytic Degradation with Nano-TiO2 in Water under Solar Illumination: Reaction Pathway and Mineralization

Clean Technologies ◽

10.3390/cleantechnol1010010 ◽

2018 ◽

Vol 1 (1) ◽

pp. 141-153 ◽

Cited By ~ 4

Author(s):

Md. Molla ◽

Mai Furukawa ◽

Ikki Tateishi ◽

Hideyuki Katsumata ◽

Satoshi Kaneco

Keyword(s):

Photocatalytic Degradation ◽

Reaction Pathway ◽

Irradiation Time ◽

Low Cost ◽

Solar Irradiation ◽

Order Kinetic ◽

Operational Parameters ◽

Sunlight Irradiation ◽

Kinetics Of ◽

Sunlight Intensity

In the present study, the photocatalytic degradation of alachlor was investigated using TiO2 under sunlight irradiation. The effects of some operational parameters, such as photocatalyst concentration, temperature, pH, sunlight intensity and irradiation time, were optimized. The kinetics of photodegradation was found to follow a pseudo-first-order kinetic law, and the rate constant at optimal condition is 0.245 min−1. The activation energy (Ea) is 6.4 kJ/mol. The alachlor mineralization can be completed under sunlight irradiation after 10 h. The formations of chloride, nitrate and ammonium ions are observed during the photocatalytic degradation. The eight photoproducts were identified by the GC–MS technique. The photodegradation reaction pathways are proposed based on the evidence of the detected photoproducts and the calculated frontier electron densities of the alachlor structure. The photocatalytic degradation treatment for the alachlor wastewater under solar irradiation is simple, convenient and low cost.

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Exploitation of Ag3PO4 Impregnated Alginate Beads for the Photocatalytic Degradation of Dye Solution under Sunlight Irradiation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.751.689 ◽

2017 ◽

Vol 751 ◽

pp. 689-694

Author(s):

Katnanipa Wanchai

Keyword(s):

Methylene Blue ◽

High Performance ◽

Alginate Beads ◽

Precipitation Method ◽

Order Model ◽

Sunlight Irradiation ◽

First Order ◽

Ft Ir ◽

Pseudo First Order ◽

Photocatalytic Reactions

Ag3PO4-alginate beads (AAB) were synthesized by simple precipitation method and their structure was characterized by XRD, FT-IR and SEM/EDS, respectively. The AAB was evaluated as the photocatalyst for degradation of methylene blue (MB) under sunlight irradiation. The results showed that AAB exhibited the high performance for degradation of MB (97.6%) in 60 min. The kinetic studied demonstrated that the photocatalytic reactions followed the pseudo first-order model. Moreover, AAB can maintain full photodegradation activity for at least five cycles. Consequently, the AAB are promising materials for the photocatalytic of dyes or similar organic contaminant in environmental pollution cleanup.

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