Enhancing photo-generated carriers transfer of K-C3N4/UiO-66-NH2 with Er doping for efficient photocatalytic oxidation of furfural to furoic acid

Q3 Energy 燃料化学学报 Pub Date : 2024-11-01 DOI:10.1016/S1872-5813(24)60469-X

Haocun WANG, Lingtao LIU, Junjie BIAN, Chunhu LI

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Abstract

Biomass-derived platform molecules, such as furfural, are abundant and renewable feedstock for valuable chemical production. It is critical to synthesize highly efficient photocatalysts for selective oxidation under visible light. The Er@K-C₃N₄/UiO-66-NH₂ catalyst was synthesized using a straight-forward hydrothermal technique, and exhibited exceptional efficiency in the photocatalytic oxidation of furfural to furoic acid. The catalyst was thoroughly characterized, confirming the effective adjustment of the band gap energy of Er@K-C₃N₄/UiO-66-NH₂. Upon the optimized reaction conditions, the conversion rate of furfural reached 89.3%, with a corresponding yield of furoic acid at 79.8%. The primary reactive oxygen species was identified as ·O− 2 from ESR spectra and scavenger tests. The incorporation of Er and K into the catalyst enhanced the photogenerated carriers transfer rate, hence increasing the separating efficiency of photogenerated electron-hole pairs. This study expands the potential applications of rare earth element doped g-C₃N₄ in the photocatalytic selective oxidation of furfurans.

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掺杂 Er 增强 K-C3N4/UiO-66-NH2 的光生载流子转移，实现糠醛到糠酸的高效光催化氧化

从生物质中提取的平台分子（如糠醛）是一种丰富的可再生原料，可用于生产有价值的化学产品。合成在可见光下进行选择性氧化的高效光催化剂至关重要。Er@K-C3N4/UiO-66-NH2 催化剂采用简单的水热技术合成，在光催化氧化糠醛为糠酸的过程中表现出卓越的效率。对催化剂进行了全面表征，证实了 Er@K-C3N4/UiO-66-NH2 带隙能的有效调节。在优化的反应条件下，糠醛的转化率达到 89.3%，相应的糠酸收率为 79.8%。根据 ESR 光谱和清除剂测试，确定主要活性氧为 -O- 2。催化剂中加入 Er 和 K 可提高光生载流子的转移率，从而提高光生电子-空穴对的分离效率。这项研究拓展了掺杂稀土元素的 g-C3N4 在光催化选择性氧化呋喃中的潜在应用。

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.