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Oxygen deficiency induction and boundary layer modulation for improved adsorption performance of titania nanoparticles

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Abstract

The use of titania (TiO2) nanoparticles as adsorbents for the adsorption of organic pollutants has attracted the attention of researchers over the years due to their stability, innocuousness, and economic cost. However, their adsorption performance has been limited, and various strategies are being explored to improve this. Herein, we demonstrated the induction of oxygen deficiency and modulation of the boundary layer of TiO2 through high-temperature treatment as a strategy for enhancing its adsorption performance. The high-temperature-treated samples denoted that HT-TiO2 was prepared by subjecting commercial Degussa P25 TiO2 to calcination at 700 ℃ for 2 h. Pristine samples designated Pr-TiO2 was utilized for comparison. The morphology, crystallinity, bulk elemental composition, and surface area of the samples were investigated using scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD), electron diffraction spectroscopy (EDS), and Brunauer–Emmett–Teller (BET), respectively. Except for the morphology and porosity (obtained from nitrogen adsorption–desorption isotherm), both samples displayed varying characteristics. Experimental results reveal better adsorption performance of metronidazole (MNZ) on HT-TiO2 (qmax = 25.6937 mg/g) compared to Pr-TiO2 (qmax = 17.9856 mg/g). This phenomenon is attributed to oxygen deficiency and a smaller boundary layer on HT-TiO2 deduced from the EDS and intra-particle diffusion model.

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Scheme 1

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Abbreviations

MNZ:

Metronidazole

TiO2/TNPs:

Titanium dioxide/nanoparticles

Pr-TiO2 :

Pristine TiO2

HT-TiO2 :

High-temperature treated TiO2

EDS:

Electron diffraction spectroscopy

BET:

Brunauer–Emmett–Teller

SEM:

Scanning electron microscopy

TEM:

Transmission electron microscopy

XRD:

X-ray diffraction

PFO:

Pseudo-first order

PSO:

Pseudo-second order

PZC:

Point of zero charge

RMSE:

Root mean square error

MAE:

Mean average error

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Acknowledgements

Laboratory of Department of Pure and Applied Chemistry, College of Natural and Applied Sciences, Veritas University Abuja, PMB 5171, Abuja, Nigeria.

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No funding was received for this research.

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Authors

Contributions

KIJ involved in conceptualization and writing—original draft; MO involved in investigation; HC, OJI, and AAA involved in methodology; VE and MOO involved in supervision of this research, review and editing; ATA involved in writing—review and editing.

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Correspondence to Martins O. Omorogie.

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The authors declare that they have no known competing financial interests or personal relationships that could have influenced the work reported in this paper.

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This article does not contain any studies involving human or animal subjects.

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John, K.I., Obu, M., Adeleye, A.T. et al. Oxygen deficiency induction and boundary layer modulation for improved adsorption performance of titania nanoparticles. Chem. Pap. 76, 3829–3840 (2022). https://doi.org/10.1007/s11696-022-02126-y

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  • DOI: https://doi.org/10.1007/s11696-022-02126-y

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