二维超薄g-C<sub>3</sub>N<sub>4</sub>的制备及其光催化性能研究

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Abstract

In this study, the ultrathin g-C₃N₄ (UCN) with large specific surface area was successfully prepared. The characterizations of the UCN were carried out by transmission electron microscope (TEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), ultraviolet-visible absorption spectrum (UV-vis) and fluorescence spectrophotometer (PL). The results showed that the as-prepared UCN sample consisted of the ultrathin two-dimension layers with abundant of pores, which could provide more active sites for photoreaction. In addition, the special structure of UCN could effectively expand its visible light absorption regions and inhibited the recombination of photo-induced carriers. The photocatalytic activity of the UCN was remarkably higher than that of g-C₃N₄ for the degradation of enrofloxacin (ENX) under simulated sunlight irradiation. 0.4g/L of UCN showed the optimal ENX degradation performance (81.7%), which was almost 4.1times higher reaction rate than that of pristine g-C₃N₄. Moreover, the photocatalytic degradation of ENX followed pseudo-first-order kinetics according to the Langmuir-Hinshelwood model. It showed best effects of the photocatalytic degradation of ENX when pH=5. The quenching experiment demonstrated that the contribution rate of O₂^·- was 66.4%, indicating that O₂^·- plays a major role in the photocatalytic degradation of ENX.

Key words： ultrathin g-C₃N₄ kinetic enrofloxacin photocatalytic Langmuir-Hinshelwood model

Received: 26 March 2017

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X131.2

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2017/V37/I10/3748

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