A mechanistic approach for superoxide radicals and singlet oxygen mediated enhanced photocatalytic dye degradation by selenium doped ZnS nanoparticles

Talukdar, Soumita; Dutta, Ruma

doi:10.1039/c5ra17940h

Cited by 89 publications

(23 citation statements)

References 51 publications

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“…The photocatalytic degradation of dyes is favoured by the activity of ROS in the reaction medium [69][70][71]. These ROS, particularly, hydroxyl radicals (OH • ), superoxide radicals (O 2…”

Section: Photocatalytic Studiesmentioning

confidence: 99%

Assessment of synthesis approaches for tuning the photocatalytic property of ZnO nanoparticles

Basnet

Samanta

Chanu³

et al. 2019

SN Appl. Sci.

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Tuning the photocatalytic property of zinc oxide (ZnO) nanoparticles (NPs) is timely. Dependence of photocatalysis upon size, morphology and effective surface area of the particles used has led to optimization in various synthesis procedures. The current article addresses to dictate a cost-effective, bio-friendly, modified ease-process for this issue. The synthesis of ZnO NPs with differing photophysical properties, sizes and morphologies, in order to tune its photocatalytic activity, have been extensively studied. Polyethylene glycol as the structure directing agent and different synthesis strategies were adopted. Spectroscopic and microscopic characterization techniques were employed to understand the nature of the as-synthesized samples. Photocatalytic property and photostability of the samples were determined based on experiments performed with common xanthene and azo dyes. Based on analysing the results, certain characteristics, such as smaller particle size, less agglomerated structure, higher surface area and superior lifetime of the photogenerated electrons and holes upon light illumination, were essential for ZnO NPs to act as an efficient photocatalyst.

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Section: Photocatalytic Studiesmentioning

confidence: 99%

Assessment of synthesis approaches for tuning the photocatalytic property of ZnO nanoparticles

Basnet

Samanta

Chanu³

et al. 2019

SN Appl. Sci.

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“…The concentration of all scavenger was chosen as 60 mM except p-benzoquinone which was selected as 6 mM. The scavengers used in this study are DMSO for * OH bulk, [27] sodium iodide for * OH ads, [28] potassium iodide for h + , [28] p-benzoquinone for superoxide radicals, [29] silver nitrate for e À , [30] and sodium azide for O � . [31] Figure 8a shows the influence of the scavengers on RB5 degradation by g-C 3 N 4 .…”

Section: Scavengersmentioning

confidence: 99%

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C₃N₄ Nanocomposites

2020

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An azo dye, Reactive Black 5 (RB5), was degraded by three photocatalysts of g‐C3N4, Ag(2 %)/g‐C3N4, and Ag(5 %)/g‐C3N4 with the specific surface areas of 34.41, 28.70, and 35.58 m2 g−1 and the band gaps of 2.52, 1.56, and 1.71 eV under sunlight illumination, respectively. The results showed 40 mg/L of g‐C3N4 could degrade completely 10 ppm RB5 at pH 3.4 within 10 min under sunlight irradiation with the first‐order rate constant of 0.312 min−1. Under the same conditions, the complete degradation time of RB5 reduced to 5 and 7 min when the plasmonic nanocomposites of Ag (2 %)/g‐C3N4 and Ag (5 %)/g‐C3N4 were used as photocatalysts, respectively. Ag content had an important influence on the photocatalytic activity of g‐C3N4 against RB5 so that Ag (2 %)/g‐C3N4 possessed the best photocatalytic efficiency with the rate constant of 0.795 min−1. In fact, Ag nanoparticles through the surface plasmon resonance effects and by accepting the photogenerated electrons could improve the visible‐light absorption and increase charge separation of g‐C3N4. The results showed superoxide radical is the main oxidant in the photodegradation of RB5.

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“…Hydrogen peroxide also produces hydroxyl radicals and therefore sometimes is added to the reactor for achieving faster photocatalytic oxidation [23]. Photocatalytic degradation of dyes can be also achieved by singlet oxygen which is 1 eV stronger oxidative agent in comparison to the oxygen fundamental state and therefore strongly electrophilic [24].…”

Section: Introductionmentioning

confidence: 99%

Decolorization of Orange-G Aqueous Solutions over C60/MCM-41 Photocatalysts

et al. 2019

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The majority of the photocatalysts studied for azo-dye degradation are based on semiconductor materials. Studies reported on non-semiconducting materials are very scarce. In the present work, we studied the fullerene (C60) ability to accelerate photodegradation of the dye’s azo bond in the presence of ascorbic acid. A series of C60 supported on ordered mesoporous silica (MCM-41) catalysts, containing 1, 3, 6, 9, and 12 wt % of fullerene C60, was studied using Orange G (OG) as representative azo-dye. This study showed that partial decolorization is achieved in the dark by simple adsorption of the dye on the bare surface of the carrier. The extent of decolorization increases with the irradiation of the suspension due to photocatalytic degradation of the azo-bond. This is maximized over the sample containing 3 wt % of C60 and it has been attributed to the best combination of the extent of the dye adsorption with the high intrinsic photocatalytic activity of small C60 clusters predominated in this sample. This catalyst proved to be quite stable upon five subsequent photocatalytic cycles, losing less than 5% of its initial activity. No degradation of OG takes place in the absence of ascorbic acid.

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A mechanistic approach for superoxide radicals and singlet oxygen mediated enhanced photocatalytic dye degradation by selenium doped ZnS nanoparticles

Abstract: Superoxide and singlet oxygen mediated photocatalytic dye degradation by Se-doped ZnS NPs.

Cited by 89 publications

References 51 publications

Assessment of synthesis approaches for tuning the photocatalytic property of ZnO nanoparticles

Assessment of synthesis approaches for tuning the photocatalytic property of ZnO nanoparticles

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C₃N₄ Nanocomposites

Decolorization of Orange-G Aqueous Solutions over C60/MCM-41 Photocatalysts

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A mechanistic approach for superoxide radicals and singlet oxygen mediated enhanced photocatalytic dye degradation by selenium doped ZnS nanoparticles

Abstract: Superoxide and singlet oxygen mediated photocatalytic dye degradation by Se-doped ZnS NPs.

Cited by 89 publications

References 51 publications

Assessment of synthesis approaches for tuning the photocatalytic property of ZnO nanoparticles

Assessment of synthesis approaches for tuning the photocatalytic property of ZnO nanoparticles

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C3N4 Nanocomposites

Decolorization of Orange-G Aqueous Solutions over C60/MCM-41 Photocatalysts

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Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C₃N₄ Nanocomposites