Fabrication of ZnO–TiO2 nanohybrids for rapid sunlight driven photodegradation of textile dyes and antibiotic residue molecules

Singh, Jaspal; Kumar, Sanjeev; Rishikesh,; Manna, Ashis K.; Soni, R. K.

doi:10.1016/j.optmat.2020.110138

Cited by 97 publications

(35 citation statements)

References 81 publications

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“…Recently, more intimate mixtures of ZnO wurtzite and TiO 2 anatase/rutile (Degussa P25) prepared by hydrothermal treatment in an alkaline medium have been reported, resulting in nanostructures with optimal physicochemical and photocatalytic properties when the ZnO:TiO 2 ratio is 1:1 17 . Also working under hydrothermal conditions but from the oxide precursors (zinc salt, and titanium (IV) isopropoxide), the preparation of nanoflakes decorated with TiO 2 nanoparticles capable of catalysing the degradation of dyes under sunlight quickly has been reported 18 . The great ability of ZnO to produce various morphologies and specific nanostructures facilitates the rational design and production of functional hetero photocatalysts by coupling with semiconductors with complementary properties 19 .…”

Section: Introductionmentioning

confidence: 99%

ZnO nucleation into trititanate nanotubes by ALD equipment techniques, a new way to functionalize layered metal oxides

Moreno

Arredondo

Ramasse

et al. 2021

Sci Rep

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In this contribution, we explore the potential of atomic layer deposition (ALD) techniques for developing new semiconductor metal oxide composites. Specifically, we investigate the functionalization of multi-wall trititanate nanotubes, H2Ti3O7 NTs (sample T1) with zinc oxide employing two different ALD approaches: vapor phase metalation (VPM) using diethylzinc (Zn(C2H5)2, DEZ) as a unique ALD precursor, and multiple pulsed vapor phase infiltration (MPI) using DEZ and water as precursors. We obtained two different types of tubular H2Ti3O7 species containing ZnO in their structures. Multi-wall trititanate nanotubes with ZnO intercalated inside the tube wall sheets were the main products from the VPM infiltration (sample T2). On the other hand, MPI (sample T3) principally leads to single-wall nanotubes with a ZnO hierarchical bi-modal functionalization, thin film coating, and surface decorated with ZnO particles. The products were mainly characterized by electron microscopy, energy dispersive X-ray, powder X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. An initial evaluation of the optical characteristics of the products demonstrated that they behaved as semiconductors. The IR study revealed the role of water, endogenous and/or exogenous, in determining the structure and properties of the products. The results confirm that ALD is a versatile tool, promising for developing tailor-made semiconductor materials.

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Section: Introductionmentioning

confidence: 99%

ZnO nucleation into trititanate nanotubes by ALD equipment techniques, a new way to functionalize layered metal oxides

Moreno

Arredondo

Ramasse

et al. 2021

Sci Rep

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“…ZnO/TiO2 at the valence band and produce electron which having energy for moving by excitation to the conduction band and remaining hole in the valence band. The heterojunction band offset link between ZnO and TiO2 used for transfer electrons from conduction band of ZnO to conduction band of TiO2 and transfer holes from the valence band of TiO2 to the valence band of ZnO [1]. By this process, the number of electrons in the conduction band of TiO2 and the number of holes in the valence band of ZnO are increased and suppressing the recombination process.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

“…Hazardous contaminants in wastewater are affected by the textile industries, cosmetics manufacturing, pharmaceutical, metals industries, paper making, and agricultural industries [1][2][3]. Azo dye is a hazardous pollutant that contains (-N=N-) bond and phenyl or naphthyl group [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Zinc oxide is n-type semiconductor with high excitation binding energy, bandgap width (3,37eV for anatase phase), biocompatibility, and it is more active when irradiation by visible light. Irradiation process for ZnO will create electron-hole by gain energy of electron for exciting to the conduction band [1]. The electron at the conduction band moves easily to the valence band by the recombination processes.…”

Section: Introductionmentioning

confidence: 99%

“…Doping TiO2 with metals or non-metal ions will increase the visible light absorbance capacity or reactivity in the UV wavelength [45,46]. The previous reports for ZnO/TiO2 as a photocatalysis with various synthesized methods are: ZnO/TiO2 nanohybrids by using a hydrothermal method for MB, R6G, OTC degradation [1], ZnO/TiO2 by using solid-state for quinoline degradation [29], ZnO/TiO2 by using sol-gel for dye degradation of methylene blue [13,35], ZnO and TiO2 commercial for phenothiazine decolorization [36], and ZnO/TiO2 thin film by using the hydrothermal method for orange G degradation [10]. However, the green, appropriate, and efficient photocatalysts materials that can be easily integrated into wastewater plants and reused for real applications is crucial.…”

Section: Introductionmentioning

confidence: 99%

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Green Synthesis ZnO/TiO2 for High Recyclability Rapid Sunlight Photodegradation Textile Dyes Applications

Rusman

Heryanto

et al. 2021

Preprint

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Composite ZnO/TiO2 have been successfully synthesized by green synthesis method with various calcination temperature 500oC, 600oC, 700oC, and 800oC (TiO2 concentrations: 2.5 g and 5 g) for photocatalyst application. In this study, Calopogonium mucunoides leaf extract was used as reducing and stabilizing agent. The synthesized composites were characterized by using Fourier Transform Infra-Red (FTIR), X-Ray Diffraction (XRD), and UV-Visible spectroscopy. The XRD spectra shows the hexagonal phase with wurtzite structure of ZnO and anatase for TiO2. The best degradation performance is 98.26% (only 10 min) for ZnO/TiO2 (5 g) with calcination temperature is 800oC. This is due to the highest distance between two optical phonon mode Δ(LO-TO) and lowest attenuating and propagating constant. The composite ZnO/TiO2 shows high potentials photodegradation of organic dyes with the high stable recyclability up to 5 cycles (> 95%) only for every 15 minutes. High potentials for applicability with the concept environmentally friendly principles and stability for circular chemistry, and efficiency of use the energy and chemicals.

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Microwave Plasma Assisted Sol‐Gel Synthesis of TiO₂ Photocatalyst for DC Plasma Jet Driven Degradation of Methylene Blue

et al. 2021

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A new microwave plasma assisted sol-gel (MPAS) technique was adopted to produce Titanium dioxide (TiO 2 ) photocatalyst by using pure and mixed stabilizers. The crystalline phases, composition, bandgap energy and surface morphology of TiO 2 were studied through SEM, XRD, FT-IR, UV-Visible spectroscopy and photoluminescence spectroscopy. The average particle size of MPAS synthesized TiO 2 nanoparticles remained smaller than the simple sol-gel method while bandgap energy increased by 40 %. The rutile content and crystallinity of nanoparticles were also found higher in MPAS synthesized TiO 2 than the simple sol-gel method. The type of stabilizer only effected the particle size but not the phase transformations of TiO 2 nanoparticles. TiO 2 photocatalyst with band gap of 3.06 eV was used to degrade methylene blue dye in water under the exposure of open atmosphere argon plasma jet. UV radiation intensity of the plasma jet at a distance of 2 cm was 576 μW/cm 2 , which reduced to 149 μW/cm 2 at 10 cm. The plasma jet produced some highly reactive species and UV radiations. The reactive species reacted with dye molecules while UV radiations promoted the activity of TiO 2 . The dye degradation efficiency of the process, under the combined effect of reactive species and TiO 2 activity, reached to 95 % after 30 min of plasma exposure time.

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Fabrication of ZnO–TiO2 nanohybrids for rapid sunlight driven photodegradation of textile dyes and antibiotic residue molecules

Cited by 97 publications

References 81 publications

ZnO nucleation into trititanate nanotubes by ALD equipment techniques, a new way to functionalize layered metal oxides

ZnO nucleation into trititanate nanotubes by ALD equipment techniques, a new way to functionalize layered metal oxides

Green Synthesis ZnO/TiO2 for High Recyclability Rapid Sunlight Photodegradation Textile Dyes Applications

Microwave Plasma Assisted Sol‐Gel Synthesis of TiO₂ Photocatalyst for DC Plasma Jet Driven Degradation of Methylene Blue

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Fabrication of ZnO–TiO2 nanohybrids for rapid sunlight driven photodegradation of textile dyes and antibiotic residue molecules

Cited by 97 publications

References 81 publications

ZnO nucleation into trititanate nanotubes by ALD equipment techniques, a new way to functionalize layered metal oxides

ZnO nucleation into trititanate nanotubes by ALD equipment techniques, a new way to functionalize layered metal oxides

Green Synthesis ZnO/TiO2 for High Recyclability Rapid Sunlight Photodegradation Textile Dyes Applications

Microwave Plasma Assisted Sol‐Gel Synthesis of TiO2 Photocatalyst for DC Plasma Jet Driven Degradation of Methylene Blue

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Microwave Plasma Assisted Sol‐Gel Synthesis of TiO₂ Photocatalyst for DC Plasma Jet Driven Degradation of Methylene Blue