在可见光下一步水热合成 CQDs/TiO2/NH2-MIL-125 以高效光催化产生 H2O2

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Jianhui Shi, Kaikai Pu, Ting Zhao, Jiating Shi, Na Zheng, Lijun Nie, Kunkun Xue, Yuhang Gao
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引用次数: 0

摘要

NH2-MIL-125 及其衍生物在光催化反应的各个方面都受到了越来越多的关注,尤其是以水(H2O)和氧(O2)为原料光催化产生过氧化氢(H2O2),这是一种前景广阔的可持续策略。然而,由于光生载流子快速重组和表面电子传递不畅,NH2-MIL-125 生成 H2O2 的效果并不理想。该研究首次采用一步水热法设计了复合光催化剂 CQDs/TiO2/NH2-MIL-125(C/T/NM)。在水热法成功负载碳量子点(CQDs)的过程中,部分NH2-MIL-125(NM)原位转化出TiO2。结果表明,NM 与 TiO2 界面之间成功构建了Ⅱ型异质结,可促进光生电子的传输。此外,CQDs 的成功负载能有效地将光生电子转移并储存到光催化剂表面参与反应,进一步避免了光生载流子的重组。C/T/NM 复合光催化剂在可见光下无氧鼓泡 5 小时的 H2O2 生成量为 455 µmol/L,是 NM 的 7.1 倍。H2O2 生成速率达到 645.4 µM/(g-h),在相同条件下优先于文献报道。最后,根据活性物种捕获实验、能带结构分析和光电化学测量结果,提出了通过 C/T/NM 高效生成 H2O2 的可能机制。这项工作为设计基于 NH2-MIL-125 的复合光催化剂生产 H2O2 提供了新思路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

One-step hydrothermal synthesis of CQDs/TiO2/NH2-MIL-125 for efficient photocatalytic production of H2O2 under visible light

One-step hydrothermal synthesis of CQDs/TiO2/NH2-MIL-125 for efficient photocatalytic production of H2O2 under visible light

NH2-MIL-125 and its derivatives are receiving more attention in various aspects of photocatalytic reactions, especially in the photocatalytic hydrogen peroxide (H2O2) production from water (H2O) and oxygen (O2), which is a promising and sustainable strategy. However, the generation of H2O2 from NH2-MIL-125 is far from satisfactory due to rapid photo-generated carriers recombination and poor surface electron transfer. In the work, the composite photocatalyst CQDs/TiO2/NH2-MIL-125 (C/T/NM) was designed for the first time by one-step hydrothermal method. TiO2 was in situ converted from partial NH2-MIL-125 (NM) during the successful loaded of Carbon quantum dots (CQDs) by hydrothermal process. The results indicated the type Ⅱ heterojunction was successfully constructed between the NM and TiO2 interface, which could promote the transmission of photo-generated electrons. In addition, the successful loaded of CQDs could effectively transfer and stored the photo-generated electrons to the photocatalyst surface to participate in the reaction, and further avoiding the recombination of photo-generated carriers. The C/T/NM composite photocatalyst achieved a H2O2 generation of 455 µmol/L for 5 hours under visible light without oxygen bubbling, which was 7.1 times superior to that of NM. The H2O2 generation rate reached 645.4 µM/(g·h), which was in priority in the reported literature under the same conditions. Finally, based on the active species capture experiments, energy band structure analysis and the photoelectrochemical measurements, a possible mechanism for the efficient H2O2 generation through C/T/NM had been proposed. This work provided new ideas for designing NH2-MIL-125 based composite photocatalysts for the production of H2O2.

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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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