Nanostructured zinc orthotitanates for photocatalytic removal of dye pollutants

Pirarath, Ragini; Bhagwat, Ujwala O.; Sivashanmugam, P.; Aljafari, Belqasem; Anandan, Sambandam

doi:10.1016/j.mseb.2022.116107

Cited by 5 publications

(4 citation statements)

References 30 publications

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“…For this band-to-band excitation, the origin of PL emission is anticipated to be defects similar to the ones observed in undoped ZnGa 2 O 4 samples, where the prominent emission has been attributed to the self-activated centres of the octahedral Ga-O group in the spinel lattices [21]. While looking for information in the literature, we found a recent article that mentions the origin of PL emission in Zn 2 TiO 4 to be O 2− and Zn 2+ vacancies related that are present in the crystal lattice [11]. The conduction band in Zn 2 TiO 4 lattice is made up of Ti-3s orbitals and the valance band is composed of Zn-3d and O-2s orbitals [22].…”

Section: Photoluminescence (Pl) Spectramentioning

confidence: 57%

“…Based on these two aspects, in the present work, we investigated the influence of synthesis conditions, annealing temperature and ZnO concentration in zinc orthotitanate (Zn 2 TiO 4 ). Zn 2 TiO 4 is an inverse spinel that exhibits interesting dielectric and optical properties, making it potentially useful in electronics, photonics, and optoelectronics [8][9][10][11]. A Zn 2 TiO 4 application for photocatalysis involves light to drive chemical reactions, which can be used for environmental remediation and water purification [11].…”

Section: Introductionmentioning

confidence: 99%

“…Zn 2 TiO 4 is an inverse spinel that exhibits interesting dielectric and optical properties, making it potentially useful in electronics, photonics, and optoelectronics [8][9][10][11]. A Zn 2 TiO 4 application for photocatalysis involves light to drive chemical reactions, which can be used for environmental remediation and water purification [11]. It has a band gap of 3.30 eV (375 nm) with a prominent photoluminescence (PL) emission in the wavelength region of 470-800 nm [12].…”

Section: Introductionmentioning

confidence: 99%

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Band Gap Modulation in Zn2TiO4 Spinels for Efficient UV-A Persistent Luminescence

Sharma,

Chouhan,

Sharma

2024

Applied Sciences

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Spinels are important materials for an application in bioimaging. The key advantage with spinel-type hosts is the presence of antisite defects, which act as charge reservoirs for trapping electrons and holes at complementary defect sites. This makes them a host system similar to a molecular system. Herein, we present a systematic approach to modulating the band gap of an inverse Zn2TiO4 spinel. With a change in ZnO concentration, the absorption band at 375 nm diminishes and disappears at a ZnO:TiO2 concentration of 1.40:1.00. The band gap of the material is modified from 3.30 to 4.40 eV. The crystal structure of the sample does not change drastically as determined using X-ray diffraction and Rietveld refinement. The Zn2TiO4 emits in the UV-A region with a lifetime in the time domain of `ns’. The sample also shows persistent luminescence of at least 15 min upon excitation with 254 nm with prominent emission in the UV-A region (300–390 nm). The present results open a new avenue for the synthesis of spinel hosts where the band gap can be modified with ease. The UV emission thus observed is expected to find usage in interesting applications like photocatalysis, anti-counterfeiting, water disinfecting, etc.

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Section: Photoluminescence (Pl) Spectramentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Band Gap Modulation in Zn2TiO4 Spinels for Efficient UV-A Persistent Luminescence

Sharma,

Chouhan,

Sharma

2024

Applied Sciences

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“…Organic dyes are extensively used in several industries, like textiles, printing, dyeing, electroplating, papermaking, and food processing. [85][86][87] The anionic dye MO is one of the most common pollutants. 88 In this work, 20 mg L −1 of MO dye solution in seawater was exposed to 1 sun illumination in the presence of CPC1.…”

Section: Dye Removalmentioning

confidence: 99%