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
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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