Upconversion-Agent Induced Improvement of g-C3N4 Photocatalyst under Visible Light

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• 作者：Jingsan Xu ; Thomas J. K. Brenner ; Zupeng Chen ; Dieter Neher ; Markus Antonietti ; Menny Shalom
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：October 8, 2014
• 年：2014
• 卷：6
• 期：19
• 页码：16481-16486
• 全文大小：347K
• ISSN：1944-8252

文摘

Herein, we report the use of upconversion agents to modify graphite carbon nitride (g-C₃N₄) by direct thermal condensation of a mixture of ErCl₃路6H₂O and the supramolecular precursor cyanuric acid-melamine. We show the enhancement of g-C₃N₄ photoactivity after Er³⁺ doping by monitoring the photodegradation of Rhodamine B dye under visible light. The contribution of the upconversion agent is demonstrated by measurements using only a red laser. The Er³⁺ doping alters both the electronic and the chemical properties of g-C₃N₄. The Er³⁺ doping reduces emission intensity and lifetime, indicating the formation of new, nonradiative deactivation pathways, probably involving charge-transfer processes.

Keywords:

metal-free photocatalysis; upconversion; carbon nitride; RhB photodegradation