Role of Polyaniline on the Photocatalytic Degradation and Stability Performance of the Polyaniline/Silver/Silver Phosphate Composite under Visible Light

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• 作者：Yuyu Bu ; Zhuoyuan Chen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：October 22, 2014
• 年：2014
• 卷：6
• 期：20
• 页码：17589-17598
• 全文大小：623K
• ISSN：1944-8252

文摘

Polyaniline/silver/silver phosphate (PANI/Ag/Ag₃PO₄) composite was prepared by in situ depositing silver phosphate (Ag₃PO₄) nanoparticles on the surface of polyaniline (PANI). The best photocatalytic Rhodamine B degradation performance is obtained by the 20 wt % PANI/Ag/Ag₃PO₄ composite, which is approximately 4 times higher than that of pure Ag₃PO₄. Meanwhile, the photocatalytic stability of Ag₃PO₄ is significantly improved by introducing PANI into the PANI/Ag/Ag₃PO₄ composite. The dramatic promotion of the photocatalytic degradation performance and the photocatalytic stability can be attributed to the formation of a heterojunction electric field between PANI and Ag₃PO₄, which is approximately 90 mV and points from Ag₃PO₄ to PANI. The existence of this electric field can dramatically enhance the separation efficiency of the photogenerated electron鈥揾ole pairs, accelerate the transfer of photogenerated holes from Ag₃PO₄ to PANI and therefore inhibit the self-oxidation of Ag₃PO₄.

Keywords:

silver phosphate; polyaniline; heterojunction; photocatalytic stability; visible light