ABSTRACT

Graphitic carbon nitride (g-C₃N₄) is a polymeric organic semiconductor that has been extensively developed for various applications. In this study, composites of g-C₃N₄ and calcined animal bone (CAB) were facilely synthesized by calcining a mixture of urea and CAB at different temperatures. The results revealed that the calcination temperature influenced yield, crystallinity, and band gap of g-C₃N₄. In addition, ultraviolet–visible diffuse reflectance spectroscopy indicated a shift in absorption edge to the high wavelength side in the presence of CAB, implying that CAB promoted thermal condensation of urea. However, thermogravimetric measurements revealed that g-C₃N₄ yield decreased as the calcination temperature increased in the presence of CAB. This is because the amount of g-C₃N₄ was scarce when the mixture was calcined at 823 K. Furthermore, the results of differential thermal analysis indicated that g-C₃N₄ and its intermediates were oxidatively decomposed by CAB at 823 K.

摘要

石墨氮化碳 (gC ₃ N ₄ ) 是一种聚合物有机半导体，已被广泛开发用于各种应用。在这项研究中，通过在不同温度下煅烧尿素和CAB的混合物，可以轻松合成gC ₃ N ₄和煅烧动物骨（CAB）的复合材料。结果表明，煅烧温度影响gC ₃ N ₄的产率、结晶度和带隙。此外，紫外-可见漫反射光谱表明，在 CAB 存在下，吸收边向高波长侧移动，这意味着 CAB 促进了尿素的热冷凝。然而，热重测量表明，gC ₃N ₄产率随着 CAB 存在下煅烧温度的升高而降低。这是因为当混合物在 823 K 下煅烧时 gC ₃ N ₄的量很少。此外，差热分析结果表明 gC ₃ N ₄及其中间体在 823 K 下被 CAB 氧化分解。