Novel 3D Cu2O/N-CQD/ZIF-8 composite photocatalyst with Z-scheme heterojunction for the efficient photocatalytic reduction of Cr(Ⅵ)

光催化 异质结 复合数 还原(数学) 材料科学 化学工程 方案(数学) 催化作用 纳米技术 光电子学 化学 复合材料 数学 有机化学 工程类 数学分析 几何学
作者
Taotao Qiang,Shao‐Ting Wang,Longfang Ren,Xiao‐Dong Gao
出处
期刊:Journal of environmental chemical engineering [Elsevier]
卷期号:10 (6): 108784-108784 被引量:12
标识
DOI:10.1016/j.jece.2022.108784
摘要

ZIF-8 exhibits poor visible light response and rapid electron-hole recombination. To address these problems, we constructed an N-CQD/ZIF-8 framework by in-situ synthesis method, then prepared a novel Z-scheme heterostructure photocatalyst (Cu 2 O/N-CQD/ZIF-8) by reduction precipitation method for the efficient photocatalytic reduction of Cr(Ⅵ). Cu 2 O/N-CQD/ZIF-8 (with a 10% Cu 2 O loading) had a unique heterostructure and exhibited significantly improved performance for Cr(Ⅵ) photoreduction. This photocatalyst successfully reduced 98.99% of the Cr(Ⅵ) in a pH = 3 solution system, which was 6 times higher than that of ZIF-8. Meantime, due to its stable interfacial adhesion, the reduction efficiency of Cr(Ⅵ) by Cu 2 O/N-CQD/ZIF-8 still reached 97.13% after five cycles. Therefore, Cu 2 O/N-CQD/ZIF-8 exhibited superior photocatalytic activity and recyclability compared with unmodified ZIF-8. The charge transfer path of this Z-scheme heterojunction was verified by free radical trapping experiments and X-ray photoelectron spectroscopy. Moreover, a possible charge transfer mechanism was proposed. N-CQD provided a potential driving force for the construction of the internal Z-scheme charge transfer system. Moreover, the synergistic effect between Cu 2 O and ZIF-8 inhibited the rapid recombination of photogenerated electron-hole pairs. This work provides potential insights for the innovative design of high-performance photocatalysts based on metal-organic frameworks for the restoration of Cr(Ⅵ)-containing wastewater. • Cu 2 O/N-CQD/ZIF-8 catalyst was proposed for photocatalytic reduction of Cr(VI). • The prepared composite photocatalyst has Z-scheme heterojunction. • The instability of photocatalytic performance of ZIF-8 was solved. • The photocatalytic reduction efficiency of Cr(VI) was up to 99%. • After five cycles, the reduction rate of Cr(VI) can still reach 97.13%.
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