Characterization and photocatalytic properties of zno tetrapods synthesized by high-temperature pyrolysis

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Abstract

The presented work presents the structural and morphological characterization and the results of studies of luminescent, photocatalytic properties of ZnO tetrapods synthesized by the method of high-temperature pyrolysis. It has been shown that the morphology and structural parameters of ZnO tetrapods are determined by the location in the synthesis zone (correlated with the distance from the air inflow window). All samples were characterized by pseudo-three-dimensional morphology of tetrapods. A correlation was found between luminescent properties and photocatalytic activity of tetrapods. The highest photodegradation rates of methylene blue under ultraviolet radiation were demonstrated by ZnO tetrapods grown in the zones closest and farthest from the window (rate constants 54 × 10–3 min–1 and 50 × 10–3 min–1, respectively).

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About the authors

V. V. Krasnova

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: amuslimov@mail.ru
Russian Federation, Moscow

A. E. Muslimov

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Author for correspondence.
Email: amuslimov@mail.ru
Russian Federation, Moscow

A. S. Lavrikov

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: amuslimov@mail.ru
Russian Federation, Moscow

L. A. Zadorozhnaya

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: amuslimov@mail.ru
Russian Federation, Moscow

F. F. Orudzhev

Dagestan State University

Email: amuslimov@mail.ru
Russian Federation, 367001, Makhachkala

R. R. Gulakhmedov

Dagestan State University

Email: amuslimov@mail.ru
Russian Federation, 367001, Makhachkala

V. M. Kanevsky

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: amuslimov@mail.ru
Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Diagram (top view in section) of growth zones of ZnO tetrapods.

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3. Fig. 2. Microscopic images of ZnO tetrapods: a – zone 1, b – zone 2, c – zone 3, d – zone 4.

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4. Fig. 3. Diffraction patterns of ZnO tetrapods grown in zones 1–4.

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5. Fig. 4. PL spectra of ZnO tetrapods grown in zones 1–4 (curve numbers correspond to zone numbers). Inset: result of deconvolution of the green luminescence band of ZnO tetrapods (zone 1); solid line 1 – experiment, dotted line 2 – result of fitting.

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6. Fig. 5. Optical absorption spectra of MS dye solutions exposed to UV radiation (253.7 nm, 180 μW/cm2) (a) and determination of the reaction rate constant (k, min–1) (b) in the presence of different types of ZnO tetrapods. C is the concentration of MS at time t from the start of irradiation, C0 is the initial concentration of MS (1 mg/l). Designations in (a): 0 – 0 min, 1 – 10 min, 2 – 20 min, 3 – 30 min, 4 – 60 min. Designations in (b): 1–4 – zones 1–4, respectively, 5 – photolysis.

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