Hydroxyapatite supported Ag₃PO₄ nanoparticles with higher visible light photocatalytic activity

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• 作者：Xiaoting Hong ; ^{hanren.xiaoting@gmail.com} ; Xiaohui Wu ; Qiuyun Zhang ; Mingfeng Xiao ; Gelin Yang ; Meirong Qiu ; Guocheng Han
• 关键词：Hydroxyapatite supported Ag3PO4 ; Photocatalysis ; Synergic mechanism ; Pronounced photocatalytic activity
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 March, 2012
• 卷：258
• 期：10
• 页码：4801-4805
• 文件大小：402 K

摘要

Hydroxyapatite supported Ag₃PO₄ nanocomposites have been synthesized by a wet impregnation process. UV-vis absorption spectra show a red shift of the absorption edges for the composite systems compared to pure hydroxyapatite support. The surface structure and morphology of the nanocomposites were characterized by Brunauer-Emmett-Teller (BET) apparatus, X-ray diffraction (XRD), transmission electron microscopy (TEM). The results suggest that Ag₃PO₄ nanoparticles (6-17 nm in diameter) are well dispersed on the hydroxyapatite support and Ag₃PO₄ nanoparticles density is larger for the higher Ag⁺ loading sample. The as-prepared nanocomposite photocatalysts showed a pronounced photocatalytic activity upon decomposition of methylene blue dye in aqueous solution under both visible light (wavelength > 400 nm) and UV-vis light irradiation. A synergic mechanism of inherent photocatalytic capability of Ag₃PO₄ and the accelerated electron/hole separation resulting from the photoinduced electrons captured by the slow-released Ag⁺ at the interface of Ag₃PO₄ and hydroxyapatite is proposed for the nanocomposites on the enhancement of photocatalytic performance in comparison to that of pure Ag₃PO₄ nanoparticles. The support of hydroxyapatite may also act as an absorbent which favors the mass transfer in heterogeneous photocatalysis reaction.