UV/visible-light photocatalytic degradation of organic dyes using ZnO nanomaterials

Các tác giả

  • Nguyen Thi Phuong Institute of Materials, Biology and Environment, Academy of Military Science and Technology, 17 Hoang Sam Street, Nghia Do Ward, Hanoi, Vietnam
  • Lai Van Duy Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Nghia Do Ward, Hanoi, Vietnam
  • Tran Van Chinh* Institute of Materials, Biology and Environment, Academy of Military Science and Technology, 17 Hoang Sam Street, Nghia Do Ward, Hanoi, Vietnam; *Department of Military Science, Ministry of National Defence of Vietnam, 28A Dien Bien Phu Street, Ba Dinh Ward, Hanoi, Vietnam

Từ khóa

methlyene blue, organic dye degradation, photocatalysis, rhodamine B,, visible light, ZnO nanomaterials

DOI:

https://doi.org/10.31276/VJSTE.2025.0066

Tóm tắt

In this study, ZnO nanomaterials were synthesised via a hydrothermal method and characterised using X-ray diffraction (XRD), scanning electron microscopy (SEM)/high-resolution transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller (BET), analysis and diffuse reflectance spectroscopy (DRS). The obtained ZnO exhibited a wurtzite structure, high crystallinity, mesoporosity, a large specific surface area of 107.17 m2/g, and a band gap of 3.19 eV. Photocatalytic performance was comparatively evaluated under visible and UV irradiation using methylene blue (MB) and Rhodamine B (RhB) as model dyes. ZnO achieved >90-98% degradation, with consistently faster kinetics under UV irradiation and MB degrading faster than RhB. Pseudo-first-order fits yielded
k(MB)=0.027 min-¹ (Vis) vs 0.076 min-¹ (UV) and k(RhB)=0.024 min-¹ (Vis) vs 0.066 min-¹ (UV), linking structureproperty features to light-dependent activity. These results establish a clear UV/Vis comparison and underscore the applicability of hydrothermal ZnO for wastewater treatment under practical illumination.

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Đã Xuất bản

2026-06-15

Số

Tập 68 Số 2C (2026): JUNE 2026 . VOLUME 68 NUMBER 2

Chuyên mục

PHYSICAL SCIENCES