Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences , 7 Nanhai Road, Qingdao 266071, China.
ACS Appl Mater Interfaces. 2014 Oct 22;6(20):17589-98. doi: 10.1021/am503578s. Epub 2014 Oct 8.
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-hole pairs, accelerate the transfer of photogenerated holes from Ag3PO4 to PANI and therefore inhibit the self-oxidation of Ag3PO4.
聚苯胺/银/磷酸银（PANI/Ag/Ag3PO4）复合材料是通过在聚苯胺（PANI）表面原位沉积磷酸银（Ag3PO4）纳米粒子制备的。在 20wt%的PANI/Ag/Ag3PO4 复合材料中，获得了最佳的罗丹明 B 光催化降解性能，约为纯 Ag3PO4 的 4 倍。同时，通过在 PANI/Ag/Ag3PO4 复合材料中引入 PANI，Ag3PO4 的光催化稳定性得到了显著提高。光催化降解性能和光催化稳定性的显著提高归因于 PANI 和 Ag3PO4 之间形成的异质结电场，其约为 90mV，从 Ag3PO4 指向 PANI。该电场的存在可以显著提高光生电子空穴对的分离效率，加速光生空从 Ag3PO4 向 PANI 的转移，从而抑制 Ag3PO4 的自氧化。
