Engineered oxygen vacancies in NiCo2O4/BiOI heterostructures for enhanced photocatalytic pollutant degradation

IF 5.8 3区环境科学与生态学 0 ENVIRONMENTAL SCIENCES

Environmental Science and Pollution Research Pub Date : 2024-12-09 DOI:10.1007/s11356-024-35728-y

Bavani Thirugnanam, Preeyanghaa Mani, Bader O. Almutairi, Kuppusamy Sathishkumar, Munusamy Settu

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Abstract

To address the bottleneck issue of poor carrier separation and transfer efficiency in NiCo₂O₄ photocatalyst, a novel 1D/2D-rod-on-rose–like NiCO₂O₄/BiOI nanohybrid with abundant OV’s was successfully synthesized using a single-step hydrothermal method and employed to the photocatalytic degradation of Rhodamine B (RhB). The study revealed that the optimized NiCo₂O₄-OV/BiOI hybrid could possess superior photocatalytic degradation efficiency towards RhB degradation under visible light with a rate constant that was 3.8 and 3.03 times greater than that of BiOI and NiCo₂O₄-OV. Experimental findings indicated that the formation of NiCo₂CO₄-OV/BiOI heterojunction significantly improved the charge separation efficiency and facilitated the formation of surface OV’s. These OVs enhanced photogenerated e⁻-h⁺ separation and increased catalytic efficiency. Quenching experiments results confirmed that both holes and superoxide radicals are playing crucial roles in the degradation process. Thus, an oxygen vacancy and engineering NiCo₂CO₄-OV/BiOI heterojunction-enhanced degradation mechanism was proposed, offering insights for the integration of advanced oxidation technologies and the development of catalytic materials to enhance pollutant degradation efficiency.

Graphical abstract

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NiCo2O4/BiOI异质结构中的工程氧空位增强光催化污染物降解。

为了解决NiCo2O4光催化剂载体分离和转移效率差的瓶颈问题，采用单步水热法成功合成了一种具有丰富OV's的新型1D/2D-rod-on-rose-like NiCo2O4 /BiOI纳米杂化物，并将其用于光催化降解罗丹明B （Rhodamine B, RhB）。研究表明，优化后的NiCo2O4-OV/BiOI杂化物在可见光下对RhB具有优异的光催化降解效率，其降解速率常数分别是BiOI和NiCo2O4-OV的3.8倍和3.03倍。实验结果表明，NiCo2CO4-OV/BiOI异质结的形成显著提高了电荷分离效率，促进了表面OV的形成。这些OVs增强了光生e—h+的分离，提高了催化效率。淬火实验结果证实了空穴和超氧自由基在降解过程中都起着至关重要的作用。因此，提出了氧空位和工程NiCo2CO4-OV/BiOI异质结增强降解机制，为整合先进氧化技术和开发催化材料以提高污染物降解效率提供了见解。

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

Environmental Science and Pollution Research 环境科学-环境科学

CiteScore

8.70

自引率

17.20%

发文量

6549

审稿时长

3.8 months

期刊介绍： Environmental Science and Pollution Research (ESPR) serves the international community in all areas of Environmental Science and related subjects with emphasis on chemical compounds. This includes: - Terrestrial Biology and Ecology - Aquatic Biology and Ecology - Atmospheric Chemistry - Environmental Microbiology/Biobased Energy Sources - Phytoremediation and Ecosystem Restoration - Environmental Analyses and Monitoring - Assessment of Risks and Interactions of Pollutants in the Environment - Conservation Biology and Sustainable Agriculture - Impact of Chemicals/Pollutants on Human and Animal Health It reports from a broad interdisciplinary outlook.