Synthesis and Photocatalytic Degradation Performance of g-C₃N₄/ CQDs/SAPO-5 Ternary Composite

Abstract:

Due to the fatal drawback of fast photoreduced electron-hole pair recombination rate of g-C₃N₄, g-C₃N₄/CQDs/SAPO-5 ternary composite were prepared. Both of carbon quantum dots and SAPO-5 can form heterojunction with g-C₃N₄ to inhibit the recombination. Their properties were characterized by XRD, SEM, FT-IR, DRS and PL. Data of PL shows a much lower photoreduced electron-hole pair recombination rate of g-C₃N₄/CQDs/SAPO-5. The effect of CQDs amount loaded on ternary composite on the RhB photodegradation performance under visible light was discussed in detail. The observed RhB degradation performances indicate that the order of photocatalytic activity is: g-C₃N₄/CQDs/SAPO-5> g-C₃N₄/ SAPO-5 > g-C₃N₄. g-C₃N₄/CQDs/SAPO-5 with CQDs load ratio of 0.25 w.t.% shows the best photodegradation performance. The highest efficiency is about 24.43% higher than g-C₃N₄/ SAPO-5 and 47.15% higher than pristine g-C₃N₄, respectively. This work is promising for developing novel g-C₃N₄-based photocatalysts for environmental purification.

• Periodical: Key Engineering Materials (Volume 768)
• Pages: 201-205
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.768.201
• Online since: April 2018
• Authors: Ling Fang Qiu, Zhi Wei Zhou, Xiao Bin Qiu, Shu Wang Duo*
• Keywords: Composite, CQDs, g-C₃N₄, Photocatalytic Degradation, SAPO-5

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