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Issue 14, 2018
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A facile approach for the synthesis of Z-scheme photocatalyst ZIF-8/g-C3N4 with highly enhanced photocatalytic activity under simulated sunlight

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Abstract

In this study, ZIF-8-modified g-C3N4 (ZIF-8/g-C3N4) composites were successfully synthesized by hydrothermal reaction. The properties of the ZIF-8/g-C3N4 composites were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (UV-vis DRS) and photoluminescence (PL) spectroscopy. The results indicated that the ZIF-8 grew on the surface of the g-C3N4, forming closely contacted interfaces between the ZIF-8 and the g-C3N4 component. The photocatalytic performance of the ZIF-8/g-C3N4 composites was evaluated through the photodegradation of Rhodamine B (RhB). The results showed that 99.8% of RhB was degraded by the ZIF-8/g-C3N4 composite with 3 wt% of ZIF-8 in 60 min under simulated sunlight, which was much higher than that of pure g-C3N4 and ZIF-8. This highly enhanced photocatalytic activity of the ZIF-8/g-C3N4 composites can be mainly attributed to strong interfacial interaction promoting the photo-generated electron–hole separation and migration. The results of radical scavenger experiments showed that ˙O2 and h+ were the dominant reactive species in the photocatalytic reaction. In addition, the ZIF-8/g-C3N4 composites showed excellent stability over several reaction cycles. Finally, a possible Z-scheme photocatalytic mechanism was proposed based on the experimental results.

Graphical abstract: A facile approach for the synthesis of Z-scheme photocatalyst ZIF-8/g-C3N4 with highly enhanced photocatalytic activity under simulated sunlight

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Publication details

The article was received on 13 Apr 2018, accepted on 16 Jun 2018 and first published on 19 Jun 2018


Article type: Paper
DOI: 10.1039/C8NJ01782D
Citation: New J. Chem., 2018,42, 12180-12187
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    A facile approach for the synthesis of Z-scheme photocatalyst ZIF-8/g-C3N4 with highly enhanced photocatalytic activity under simulated sunlight

    X. Liu, J. Zhang, Y. Dong, H. Li, Y. Xia and H. Wang, New J. Chem., 2018, 42, 12180
    DOI: 10.1039/C8NJ01782D

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