Facile synthesis of 3D porous thermally exfoliated g-C3N4 nanosheet with enhanced photocatalytic degradation of organic dye
2016
Yuan, Xiaoya | Zhou, Chou | Jin, Yanrong | Jing, Qiuye | Cangmingshui, | Shen, Xu | Tang, Qi | Mu, Yuanhua | Du, An-Ke
3D porous framework composed of exfoliated ultrathin nanosheets is a hot topic in the field of energy storage and conversion. A facile method to prepare 3D mesoporous C₃N₄ with few-layered nanosheets interconnected in large quantity via H₂SO₄ intercalation and subsequent thermal treatment was described herein. The obtained thermally-exfoliated C₃N₄ (TE-C₃N₄) was thoroughly characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM), UV–Vis diffuse reflectance spectroscopy (DRS) and Brunauer–Emmett–Teller (BET) measurements. The detailed analysis indicated that TE-C₃N₄ possessed enlarged inter-layer space, enhanced UV-light adsorption and high specific surface area with 3D interconnected structure composed of ultrathin 2D nanosheets. Compared to bulk C₃N₄, TE-C₃N₄ showed an enhanced photocatalytic activity for photodegradation of Rhodamine B under UV-light irradiation and exhibited no significant loss of photocatalytic activity after 11 recycled runs. The pseudo-first reaction rate constant for TE-C₃N₄ was about four times higher than that for pure bulk-C₃N₄. The better photocatalytic performance could be attributed to more active catalytic sites, prolonged photo-excited carrier lifetime and shorted pathway of the carriers to the reaction sites.
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