形貌可控的Ag3PO4颗粒的制备及其生长机理研究

Fabrication and Growth Mechanism of AgPO Particles with Controllable Morphology

Ag3PO4作为一种新型可见光催化剂,因其可见光活性高而备受关注。首先以AgNO3溶液作为前驱体,Na2HPO4溶液为磷源,利用简单的离子交换法合成了球状Ag3PO4颗粒。其次以[Ag(NH3)2]+溶液取代AgNO+3溶液作为前驱体,室温条件下分别加入三种不同磷酸盐Na3PO4、Na2HPO4、NaH2PO4溶液,均可制备得到立方体形Ag3PO4颗粒,其由6个{100}晶面包裹而成,晶粒大小分别为3μm,2μm,600 nm。然后,以[Ag(NH3)2]+溶液作为前驱体,通过调节与Na2HPO4溶液的反应温度合成了八角体形Ag3PO4颗粒。因此,通过调节反应物质的种类及反应温度,可制备得到形貌可控的高活性面Ag3PO4颗粒。进一步利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)分别对Ag3PO4样品的晶相组成、微观形貌等进行表征,并对三种不同形貌Ag3PO4颗粒的生长机理进行了初步的探讨与分析。

As a novel type of visible light photocatalyst, Ag3PO4 has attracted much attention due to its high visible light activity. In this work, spherical shaped Ag3PO4 particles were successfully fabricated through a simple ion exchange method by using AgNO3 solution as the precursor and Na2 HPO4 solution as the phosphorus source. While AgNO3 solution was replaced with fresh [Ag(NH3)2]+solution as precursor, cubic shaped Ag3PO4 crystal particles were prepared by adding any one of three different phosphate solutions, such as Na3 PO4, Na2 HPO4, NaH2 PO4. Moreover, the cubic Ag3PO4 crystals were wrapped by 6 {100} crystal faces, and the average size was 3 μm, 2 μm, 600 nm respectively. Meanwhile, the octagonal shaped Ag3PO4 particles were fabricated by adjusting the reaction temperature of Na2 HPO4 solution and [Ag(NH3)2]+precursor solution. Consequently, highly active surface Ag3PO4 particles with controllable morphology can be fabricated by changing types of reactants and reaction temperature. Furthermore, X-ray diffraction(XRD) and scanning electron microscope(SEM) were used to characterize the crystalline phase composition and micromorphology of Ag3PO4 samples, and the growth mechanism of these Ag3PO4 particles were analyzed in detail.