A simple and efficient ultrasonic-assisted electrochemical approach for scalable production of nitrogen-doped TiO2nanocrystals

Nguyen Thi Khanh Van; Nguyen Nang Dinh; Nguyen Van Chien; Nguyen Nhat Huy; Nguyen Thanh Trung; Tran Quoc Toan; Dang Van Thanh

doi:10.1088/1361-6528/ac1b55

A simple and efficient ultrasonic-assisted electrochemical approach for scalable production of nitrogen-doped TiO₂nanocrystals

Nanotechnology. 2021 Aug 25;32(46). doi: 10.1088/1361-6528/ac1b55.

Authors

Nguyen Thi Khanh Van^{1

2}, Nguyen Nang Dinh¹, Nguyen Van Chien³, Nguyen Nhat Huy^{4

5}, Nguyen Thanh Trung⁶, Tran Quoc Toan⁷, Dang Van Thanh^{1

8}

Affiliations

¹ VNU University of Engineering and Technology, Vietnam National University, Hanoi, 144 Xuan Thuy road, Cau Giay, Hanoi, Vietnam.
² Institute of Science and Technology, TNU-University of Sciences, Tan Thinh ward, Thai Nguyen City, Vietnam.
³ Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi, Vietnam.
⁴ Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet St., Dist. 10, Ho Chi Minh City, Vietnam.
⁵ Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam.
⁶ Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi, Vietnam.
⁷ Faculty of Chemistry, TNU-University of Education, 20 Luong Ngoc Quyen St., Thai Nguyen City, Vietnam.
⁸ Faculty of Basic Sciences, TNU-University of Medicine and Pharmacy, 284 Luong Ngoc Quyen St., Thai Nguyen City, Vietnam.

PMID: 34359057
DOI: 10.1088/1361-6528/ac1b55

Abstract

In this study, we report a facile and effective approach for large-scale production of nitrogen-doped TiO₂nanocrystals (UNTs) by a combination of ultrasonic irradiation and electrochemistry at room temperature using NH₄NO₃electrolyte as the nitrogen source. The as-prepared UNTs were then characterized by x-ray diffraction, Raman spectroscopy, x-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and UV-visible diffuse reflectance spectroscopy. The results indicated that the nitrogen content of UNTs reached 9.3% and bandgap energy of 2.62 eV, thus gave the high photocatalytic degradation of methylene blue under visible light irradiation. The mechanism for the formation of UNTs by ultrasonic-assisted electrochemical approach was also proposed.

Keywords: N-doped; TiO2; electrochemical; ultrasonic-assisted; visible light.