高可见光催化活性立方体浮雕状Ag3PO4的合成

doi:10.15541/jim20180455

摘要/Abstract

摘要：

采用简单的水浴法成功制备了具有高可见光活性的Ag₃PO₄材料。扫描电镜测试结果表明反应过程中产物经历了三种形貌的演变, 最终产物具有均一的立方体浮雕形貌, 平均颗粒尺寸大小约为1.6 μm。通过X射线衍射图谱可知产物具有体心立方结构。此外, 从高倍透射电镜图片中可判断出样品表面存在多种晶面。紫外-可见吸收光谱和荧光光谱结果表明该产物具有高的响应可见光的性能和较弱的荧光发射强度。该产物与立方Ag₃PO₄、反应的中间产物和商用氮化的TiO₂催化剂相比, 在可见光下对甲基橙的降解表现出有显著的催化活性。研究工作表明, 通过改变催化剂的表面结构可以有效提高材料的光催化性能。

关键词: 磷酸银, 立体浮雕状, 多种晶面, 可见光催化

Abstract:

High visible-light photocatalytic activity silver phosphate (Ag₃PO₄) was successfully prepared via a facile water bath method. Scanning electron microscopy (SEM) images show that the products undergo three morphological changes during the reaction process, and the final product has uniform cubic-relievo morphology with an average particle size of about 1.6 μm. X-ray diffraction (XRD) patterns indicate that the samples are body-center cubic structure. In addition, the high resolution transmission electron microscopy (HRTEM) images show that several crystal facets are located in the surfaces of cubic-relievo Ag₃PO₄. UV-Vis absorption and photoluminescence (PL) spectra demonstrate that the products possess high visible-light responsive performance and weak PL emission intensity. The cubic-relievo Ag₃PO₄exhibits significantly higher catalytic performance when applied on the photodegradation of methyl orange (MO) under visible-light irradiation in comparison to the cubic Ag₃PO₄, intermediate products or commercial nitrided TiO₂ photocatalyst. This work indicates that the photocatalytic performance of the catalyst can be effectively improved by changing its surface structure.

Key words: Ag₃PO₄, cubic-relievo, crystal faces, visible-light photocatalysis

中图分类号:

TQ174

魏居孟, 吕强, 王奔驰, 潘家乐, 叶祥桔, 宋常春. 高可见光催化活性立方体浮雕状Ag₃PO₄的合成[J]. 无机材料学报, 2019, 34(7): 786-790.

WEI Ju-Meng, LÜ Qiang, WANG Ben-Chi, PAN Jia-Le, YE Xiang-Ju, SONG Chang-Chun. Synthesis of Cubic-relievo Ag₃PO₄ with High Visible-light Photocatalytic Activity[J]. Journal of Inorganic Materials, 2019, 34(7): 786-790.

图/表 8

Scheme 1 Synthesis process and morphology evolution of Ag3PO4 with the reaction time extending

Fig. 1 Different magnification SEM images of initial (a-b), and final products(c-d) with insets showing the correponding histogram of size distribution

Fig. 2 XRD patterns of cubic and cubic-relievo products

Fig. 3 HRTEM images of (a) cubic-relievo Ag3PO4 and (b) cubic Ag3PO4 with insets showing the correspongding FFT patterns of HRTEM images

Fig. 4 (a) Ultraviolet-visible diffusive reflectance spectra, and (b) plots of light energy (αhν)2 vs. photon energy (hν) for the determination of the direct optical band gap of cubic-relievo Ag3PO4 and cubic Ag3PO4

Fig. 5 PL emission spectra of cubic and cubic-relievo Ag3PO4

Fig. 6 Photocatalytic activities of MO over cubic-relievo Ag3PO4, cubic Ag3PO4 and commercial nitrided TiO2 under visible- light irradiation (λ>420 nm) (a), the first-order rate constant of three types of Ag3PO4 on degradation of MO (b)

Fig. 7 Schematic illustration of the mechanism for the photocatalytic performance of cubic-relievo Ag3PO4

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高可见光催化活性立方体浮雕状Ag₃PO₄的合成

Synthesis of Cubic-relievo Ag₃PO₄ with High Visible-light Photocatalytic Activity

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