Effect of calcination temperature on the microstructure and electronic properties of TiO2–ZnO nanocomposites and implications on photocatalytic activity

Menon, N. Gayathri; Tatiparti, Sankara Sarma V.; Mukherji, Suparna

doi:10.1007/s13204-018-0783-z

Cited by 9 publications

(4 citation statements)

References 45 publications

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“…The bandgap values were determined from diffuse reflectance spectroscopy (DRS) as described by Menon et al (2018). [15] Assessment of Photocatalytic Activity: Decolorization of methyl orange (MO) dye (10 mg/L initial concentration) in the presence of both UV and visible irradiation of 125 W power rating was studied at a nanocomposite loading of 5 g/L. The reactions were carried out in a quartz reactor system (Lelesil Innovative Systems, Thane, India) of 200 mL working volume, stirred using a magnetic stirrer, and aerated (3.3 L/min).…”

Section: Methodsmentioning

confidence: 99%

“…The bandgap values were determined from diffuse reflectance spectroscopy (DRS) as described by Menon et al (2018). [ 15 ]…”

Section: Methodsmentioning

confidence: 99%

“…Heterostructures comprising of anatase TiO 2 and other metal oxides, [ 15 ] and anatase with other TiO 2 phases, such as rutile, [ 10 ] are reported to be active under visible irradiation. Their superior photocatalytic activity was attributed to the presence of anatase or a favorable anatase/rutile ratio.…”

Section: Introductionmentioning

confidence: 99%

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Selective Removal of Photocatalytically Active Anatase TiO₂ Phase from Mixed‐Phase TiO₂‐ZnO Nanocomposites: Impact on Physicochemical Properties and Photocatalytic Activity

Menon

Tatiparti

Mukherji

2020

Energy & Environ Materials

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Heterogeneous photocatalysis employing semiconductor nanoparticles, especially TiO 2 nanoparticles, has attained considerable research interest in recent years. [1] TiO 2 is known to exist in three polymorphic forms, viz. anatase, rutile, and brookite. [2] Often, anatase TiO 2 is considered to be the most photocatalytically active due to high adsorption affinity for organic molecules even at low concentration [3] and low recombination of charge carriers, owing to inherently present oxygen vacancies. [4] However, the inability to utilize visible light limits the practical application of TiO 2 for photocatalysis. [5] Therefore, in recent years, synthesis and application of photocatalytic heterostructures based on TiO 2 and other semiconductors/noble metals have emerged as a strategy to facilitate visible light activity. [6-9] Nanocomposites made of two of the most versatile semiconductor oxides, viz. TiO 2 and ZnO have drawn considerable attention for photocatalytic processes. [10] TiO 2-ZnO nanocomposites have shown good potential for degradation of a variety of organic pollutants, [11,12] and activity under visible irradiation was feasible due to favorable alignment of energy states of both TiO 2 and ZnO. [12-14] Heterostructures comprising of anatase TiO 2 and other metal oxides, [15] and anatase with other TiO 2 phases, such as rutile, [10] are reported to be active under visible irradiation. Their superior photocatalytic activity was attributed to the presence of anatase or a favorable anatase/rutile ratio. The superior photocatalytic activity of anatase TiO 2 is well established. [16] According to literature reports, anatase exhibits an indirect bandgap in addition to its direct bandgap, which enhances charge carrier lifetime. [17] Anatase TiO 2 , being a quasi-stable polymorph, is susceptible to formation of defects and, hence, midgap defect states. [18] On the other hand, pure rutile phase of TiO 2 is reported to be photocatalytically inferior to anatase phase. [3] Contrary to such theories, recent studies have suggested that phase transformations were controlled by the addition of ZnO, such that, at optimal Ti:Zn molar ratios, a unique mix of various TiO 2 , ZnO, and zinc titanate phases coexisted which helped in tailoring the bandgap. This facilitated visible light activity even when anatase was present in negligible amounts or even absent. [19] Interestingly,

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Section: Methodsmentioning

confidence: 99%

“…The bandgap values were determined from diffuse reflectance spectroscopy (DRS) as described by Menon et al (2018). [ 15 ]…”

Section: Methodsmentioning

confidence: 99%

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Selective Removal of Photocatalytically Active Anatase TiO₂ Phase from Mixed‐Phase TiO₂‐ZnO Nanocomposites: Impact on Physicochemical Properties and Photocatalytic Activity

Menon

Tatiparti

Mukherji

2020

Energy & Environ Materials

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“…vacancies/interstitials within the crystal, they can also act as a charge carrier and disturbed the electronic band structures. 21 This shi is attributed a decrease in the band gap energy. The band gap energies for direct (Fig.…”

Section: Drs Analysismentioning

confidence: 99%

Effect of calcination temperature induced structural modifications on the photocatalytic efficacy of Fe₂O₃–ZrO₂ nanostructures: mechanochemical synthesis

Zain,

Yasin,

Haq

et al. 2024

RSC Adv.

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Synthesis, characterization and photocatalytic activity evaluation of TiO2 – ZnO nanocomposites: Elucidating effect of varying Ti:Zn molar ratio

Menon

Tatiparti

Mukherji

2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Effect of calcination temperature on the microstructure and electronic properties of TiO2–ZnO nanocomposites and implications on photocatalytic activity

Cited by 9 publications

References 45 publications

Selective Removal of Photocatalytically Active Anatase TiO₂ Phase from Mixed‐Phase TiO₂‐ZnO Nanocomposites: Impact on Physicochemical Properties and Photocatalytic Activity

Selective Removal of Photocatalytically Active Anatase TiO₂ Phase from Mixed‐Phase TiO₂‐ZnO Nanocomposites: Impact on Physicochemical Properties and Photocatalytic Activity

Effect of calcination temperature induced structural modifications on the photocatalytic efficacy of Fe₂O₃–ZrO₂ nanostructures: mechanochemical synthesis

Synthesis, characterization and photocatalytic activity evaluation of TiO2 – ZnO nanocomposites: Elucidating effect of varying Ti:Zn molar ratio

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Effect of calcination temperature on the microstructure and electronic properties of TiO2–ZnO nanocomposites and implications on photocatalytic activity

Cited by 9 publications

References 45 publications

Selective Removal of Photocatalytically Active Anatase TiO2 Phase from Mixed‐Phase TiO2‐ZnO Nanocomposites: Impact on Physicochemical Properties and Photocatalytic Activity

Selective Removal of Photocatalytically Active Anatase TiO2 Phase from Mixed‐Phase TiO2‐ZnO Nanocomposites: Impact on Physicochemical Properties and Photocatalytic Activity

Effect of calcination temperature induced structural modifications on the photocatalytic efficacy of Fe2O3–ZrO2 nanostructures: mechanochemical synthesis

Synthesis, characterization and photocatalytic activity evaluation of TiO2 – ZnO nanocomposites: Elucidating effect of varying Ti:Zn molar ratio

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Selective Removal of Photocatalytically Active Anatase TiO₂ Phase from Mixed‐Phase TiO₂‐ZnO Nanocomposites: Impact on Physicochemical Properties and Photocatalytic Activity

Selective Removal of Photocatalytically Active Anatase TiO₂ Phase from Mixed‐Phase TiO₂‐ZnO Nanocomposites: Impact on Physicochemical Properties and Photocatalytic Activity

Effect of calcination temperature induced structural modifications on the photocatalytic efficacy of Fe₂O₃–ZrO₂ nanostructures: mechanochemical synthesis