Wavelength dependent photocatalytic decolorization of dyes using zinc oxide nanorod catalyst

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2026-06-01 Epub Date: 2026-02-02 DOI:10.1016/j.optmat.2026.117938

Myo Tay Zar Myint , Salim Al-Harthi , Zahra Al-Sharji , Tamadher Al-Salmani , Mohammed Al-Abri , Htet Htet Kyaw

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Abstract

Various wavelengths generate different energies and can serve as excitation sources for the photocatalysis process. In this research, a step-by-step process was employed to fabricate zinc oxide (ZnO) nanorods by wet chemical synthesis method on a glass surface. Different colors of light-emitting diodes (LEDs) excited the ZnO photocatalyst and degraded two dyes, namely methylene blue (MB) and Congo red (CR). The highest degradation efficiency of 95% for CR dye, as well as the fastest reaction kinetics (0.0089 min⁻¹), was achieved under blue LED irradiation. For MB dye, the red LED yielded the highest degradation (72%), and the fastest degradation kinetics (0.0024 min⁻¹) was observed under white LED irradiation. Energy matching between defect states of ZnO nanorods and the blue LED emission, together with the spectral overlap between the dye and the excitation source, enhances reactive oxygen species generation. This improves dyes degradation. Time-dependent photon efficiency estimation results showed the maximum efficiency of 11.8% at the 3rd hour of the photocatalytic process for MB dye under red LED excitation. This finding contributes to the understanding of the excitation wavelength-dependent photodegradation phenomenon in color dyes, aiming to maximize the energy efficient degradation process.

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波长依赖性氧化锌纳米棒催化剂对染料的光催化脱色

不同的波长产生不同的能量，可以作为光催化过程的激发源。在本研究中，采用湿法化学合成方法在玻璃表面逐步制备氧化锌纳米棒。不同颜色的发光二极管（led）激发ZnO光催化剂，降解亚甲基蓝（MB）和刚果红（CR）两种染料。在蓝色LED照射下，CR染料的降解效率最高，达到95%，反应动力学最快（0.0089 min−1）。对于MB染料，在白色LED照射下，红色LED的降解率最高（72%），降解动力学最快（0.0024 min−1）。ZnO纳米棒缺陷态与蓝色LED发光的能量匹配，以及染料与激发源的光谱重叠，增强了活性氧的生成。这改善了染料的降解。随时间变化的光子效率估计结果表明，在红色LED激发下，MB染料在光催化过程的第3小时效率最高，达到11.8%。这一发现有助于理解彩色染料中激发波长依赖的光降解现象，旨在最大限度地提高能效降解过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.