One-step synthesis of black TiO2-x microspheres by ultrasonic spray pyrolysis process and their visible-light-driven photocatalytic activities

Ji, Myeongjun; Choa, Yong‐Ho; Lee, Young In

doi:10.1016/j.ultsonch.2021.105557

Cited by 31 publications

(7 citation statements)

References 43 publications

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“…X-ray photoelectron spectra (XPS) of the elements in bare-TiO 2 and the Ag–Fe 3 O 4 @TiO 2 composite are obtained and presented in Figure (a)–(d). The XPS spectrum of Ti in bare-TiO 2 shows two characteristic peaks at 458.4 and 464.0 eV respective to Ti 2p 3/2 and Ti 2p 1/2 components, which indicate that the Ti ions possess +4 oxidation states in bare-TiO 2 . In contrast, the Ti spectrum of Ag–Fe 3 O 4 @TiO 2 is relatively found to be broader, and its deconvoluted spectrum shows a peak at 457.9 eV corresponding to the Ti 2p 3/2 component of the Ti 3+ oxidation state in addition to the Ti 4+ 2p 3/2 and Ti 4+ 2p 1/2 signals at 458.3 and 464.2 eV, respectively (Figure (a)) .…”

Section: Resultsmentioning

confidence: 96%

“…The XPS spectrum of Ti in bare-TiO 2 shows two characteristic peaks at 458.4 and 464.0 eV respective to Ti 2p 3/2 and Ti 2p 1/2 components, which indicate that the Ti ions possess +4 oxidation states in bare-TiO 2 . 25 In contrast, the Ti spectrum of Ag−Fe 3 O 4 @TiO 2 is relatively found to be broader, and its deconvoluted spectrum shows a peak at 457.9 eV corresponding to the Ti 2p 3/2 component of the Ti 3+ oxidation state 26 in addition to the Ti 4+ 2p 3/2 and Ti 4+ 2p 1/2 signals at 458.3 and 464.2 eV, respectively (Figure 2(a)). 27 The coexistence of Ti 3+ /Ti 4+ states indicates that TiO 2 in Ag− Fe 3 O 4 @TiO 2 possesses oxygen vacancy defects in the system.…”

Section: Structural Investigationsmentioning

confidence: 99%

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Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe₃O₄@TiO₂ Ternary Nanocomposites for Dye Degradation and H₂ Production under Light and Dark Conditions

et al. 2022

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This study explores the preparation of Ag plasmons-sensitized magnetic-Fe 3 O 4 integrated TiO 2 (Ag−Fe 3 O 4 @TiO 2 ) ternary nanocomposites and their defectinduced electron storage properties to exploit their photocatalytic memory effect toward dye degradation and H 2 generation under light and dark conditions. The crystalline phase formation and elemental states of the individual materials and elements in the nanocomposite are analyzed using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The existence of Ti and Fe ions with dual oxidation states of Ti 4+/3+ and Fe 3+/2+ , respectively, is observed by XPS, which revealed the presence of defects in the system. The observed red shift along with a distinct plasmonic band (corresponding to metallic Ag nanoparticles) in the UV−visible absorption spectrum and the observed modified radiative recombination emission in the PL spectrum confirmed the plasmon-driven visible light activity along with the improved carrier separation and transfer characteristics in the synthesized ternary composite. Accordingly, the Ag− Fe 3 O 4 @TiO 2 photocatalyst degraded almost 100% of MB (methylene blue) and RhB (rhodamine B) dyes under simulated solar light in 90 min, while it is found to be around 42% and 36% in 60 min under dark conditions, respectively (which is preirradiated for 60 min). Further, it produced H 2 at the rate of 911 μmol g −1 h −1 under light conditions and is decreased to ∼96 μmol g −1 h −1 under dark conditions which is preirradiated for 1 h. However, when the composite is preirradiated for 3 h, it showed a maximum H 2 evolution of 144 μmol g −1 h −1 under dark. Further, the photocurrent and electrochemical impedance under light and dark conditions suggested the mechanism of photocatalytic charge storage and transfer process in the composite. Although the photocatalytic memory effect of the composite is meager toward H 2 production due to the insufficient potential of the stored−released electrons to reduce the protons (2H + ) to H 2 under dark conditions, their degradation efficiency is considerably good.

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Section: Resultsmentioning

confidence: 96%

Section: Structural Investigationsmentioning

confidence: 99%

Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe₃O₄@TiO₂ Ternary Nanocomposites for Dye Degradation and H₂ Production under Light and Dark Conditions

et al. 2022

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“…As shown in Table 2 , the orbital doublet peaks Ti2p 3/2 and Ti2p 1/2 of the Mn-B-TiO 2 NPs were both located at a higher binding energy (BE) of 460.04 and 465.58 eV compared to 459.04 and 465.05 eV, respectively. These peak positions were typical of anatase phase TiO 2 [ 42 ]. The results suggested that the anatase phase of the synthesized Mn/TiO 2 was intact after Mn doping, which is consistent with the XRD results presented in Figure 2 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Manganese-Modified Black TiO2 Nanoparticles and Their Performance Evaluation for the Photodegradation of Phenolic Compounds from Wastewater

et al. 2021

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The release of phenolic-contaminated treated palm oil mill effluent (TPOME) poses a severe threat to human and environmental health. In this work, manganese-modified black TiO2 (Mn-B-TiO2) was produced for the photodegradation of high concentrations of total phenolic compounds from TPOME. A modified glycerol-assisted technique was used to synthesize visible-light-sensitive black TiO2 nanoparticles (NPs), which were then calcined at 300 °C for 60 min for conversion to anatase crystalline phase. The black TiO2 was further modified with manganese by utilizing a wet impregnation technique. Visible light absorption, charge carrier separation, and electron–hole pair recombination suppression were all improved when the band structure of TiO2 was tuned by producing Ti3+ defect states. As a result of the enhanced optical and electrical characteristics of black TiO2 NPs, phenolic compounds were removed from TPOME at a rate of 48.17%, which is 2.6 times higher than P25 (18%). When Mn was added to black TiO2 NPs, the Ti ion in the TiO2 lattice was replaced by Mn, causing a large redshift of the optical absorption edges and enhanced photodegradation of phenolic compounds from TPOME. The photodegradation efficiency of phenolic compounds by Mn-B-TiO2 improved to 60.12% from 48.17% at 0.3 wt% Mn doping concentration. The removal efficiency of phenolic compounds from TPOME diminished when Mn doping exceeded the optimum threshold (0.3 wt%). According to the findings, Mn-modified black TiO2 NPs are the most effective, as they combine the advantages of both black TiO2 and Mn doping.

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“…1b,c), techniques like ultrasonic spray atomization (Fig. 1d) can be integrated into spray pyrolysis setups to produce well-controlled particle morphologies, as reported by Ji et al [12] for the synthesis of black titania microspheres (Fig. 2a,b).…”

Section: Ultrasound-assisted Synthesis Of Photocatalystsmentioning

confidence: 96%

Ultrasound waves at the service of photocatalysis: From sonochemical synthesis to ultrasound-assisted and piezo-enhanced photocatalysis

Meroni

Bianchi

2022

Current Opinion in Green and Sustainable Chemistry

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One-step synthesis of black TiO2-x microspheres by ultrasonic spray pyrolysis process and their visible-light-driven photocatalytic activities

Abstract: Graphical abstract

Cited by 31 publications

References 43 publications

Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe₃O₄@TiO₂ Ternary Nanocomposites for Dye Degradation and H₂ Production under Light and Dark Conditions

Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe₃O₄@TiO₂ Ternary Nanocomposites for Dye Degradation and H₂ Production under Light and Dark Conditions

Synthesis and Characterization of Manganese-Modified Black TiO2 Nanoparticles and Their Performance Evaluation for the Photodegradation of Phenolic Compounds from Wastewater

Ultrasound waves at the service of photocatalysis: From sonochemical synthesis to ultrasound-assisted and piezo-enhanced photocatalysis

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One-step synthesis of black TiO2-x microspheres by ultrasonic spray pyrolysis process and their visible-light-driven photocatalytic activities

Abstract: Graphical abstract

Cited by 31 publications

References 43 publications

Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe3O4@TiO2 Ternary Nanocomposites for Dye Degradation and H2 Production under Light and Dark Conditions

Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe3O4@TiO2 Ternary Nanocomposites for Dye Degradation and H2 Production under Light and Dark Conditions

Synthesis and Characterization of Manganese-Modified Black TiO2 Nanoparticles and Their Performance Evaluation for the Photodegradation of Phenolic Compounds from Wastewater

Ultrasound waves at the service of photocatalysis: From sonochemical synthesis to ultrasound-assisted and piezo-enhanced photocatalysis

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Product

Resources

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Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe₃O₄@TiO₂ Ternary Nanocomposites for Dye Degradation and H₂ Production under Light and Dark Conditions

Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe₃O₄@TiO₂ Ternary Nanocomposites for Dye Degradation and H₂ Production under Light and Dark Conditions