TiO2分级结构/Ag3PO4复合材料的可见光催化性能

doi:10.7503/cjcu20140870

高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (6): 1194.doi: 10.7503/cjcu20140870

TiO₂分级结构/Ag₃PO₄复合材料的可见光催化性能

李卫兵¹(), 冯昌¹, 岳继光¹, 华方霞¹, 补钰煜²

1. 青岛科技大学环境与安全工程学院, 青岛 266042
2. 中国科学院海洋研究所海洋环境腐蚀与生物污损重点实验室, 青岛 266071

收稿日期:2014-09-25 出版日期:2015-06-10 发布日期:2015-05-22
作者简介:联系人简介: 李卫兵, 女, 博士, 副教授, 主要从事纳米光催化及光电化学裂解水制氢研究. E-mail:lwbing@qust.edu.cn
基金资助:
国家自然科学基金(批准号: 41376126)和中国科学院海洋研究所海洋环境腐蚀与生物污损重点实验室开放基金资助

Photocatalytic Performance of Hierarchical TiO₂/Ag₃PO₄Composite Under Visible-light Illumination^†

LI Weibing^1,^*(), FENG Chang¹, YUE Jiguang¹, HUA Fangxia¹, BU Yuyu²

1. School of Environment and Safety Engineering, Qingdao University of Science and Technology,Qingdao 266042, China
2. Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology,Chinese Academy of Sciences, Qingdao 266071, China

Received:2014-09-25 Online:2015-06-10 Published:2015-05-22
Contact: LI Weibing E-mail:lwbing@qust.edu.cn
Supported by:
† Supported by the National Natural Science Foundation of China(No.41376126) and the Foundation of Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences

摘要/Abstract

摘要：

制备了具有分级结构的海胆状TiO₂纳米材料, 并通过原位沉积法将可见光响应的Ag₃PO₄纳米颗粒沉积到TiO₂的纳米分级结构上, 合成了具有高效稳定可见光催化性能的系列TiO₂分级结构/Ag₃PO₄复合材料, 对比测试了系列材料对罗丹明B(RhB)的光催化降解性能. 结果表明, TiO₂分级结构/Ag₃PO₄复合材料光催化性能明显高于纯相的Ag₃PO₄光催化剂, 同时也明显优于TiO₂(P25)/Ag₃PO₄复合光催化剂, 其中分级结构TiO₂ 与Ag₃PO₄摩尔比为1∶1的复合材料具有最强的光催化性能, 在可见光照射6 min内可实现RhB的完全脱色. 分析结果表明, 与纳米颗粒TiO₂相比, 具有海胆状纳米结构的TiO₂可为Ag₃PO₄的负载提供更多的担载位点, 增加TiO₂和Ag₃PO₄的接触面积, 进而提升Ag₃PO₄光激发产生的光生电子-空穴的分离效率. 同时在光降解过程中, Ag₃PO₄表面存在的少量Ag⁺会逐渐还原成单质Ag⁰, 通过Ag⁰的等离子体共振效应, 可增加对光子的吸收转换能力, 从而进一步提高该复合材料光催化降解染料的性能.

关键词: 分级结构TiO2, 磷酸银, 可见光催化, 界面效应, 异质结

Abstract:

Urchin-like TiO₂ nanomaterial with hierarchical structure(PTHSs) was prepared, then Ag₃PO₄ nanomaterial with visible-light response was deposited on the hierarchical TiO₂ by simple deposition precipitation method, thus a series of PTHSs/Ag₃PO₄ composites with efficient visible-light photocatalytic performance and stability was synthesized. The photocatalytic performance of the PTHSs/Ag₃PO₄ composites for degrading Rhodamine B(RhB) was analyzed. The results show that the photocatalytic performance of PTHSs/Ag₃PO₄ composite is significantly superior to that of pure Ag₃PO₄ and that of TiO₂(P25)/Ag₃PO₄ composite. The composite with a PTHSs/Ag₃PO₄ molar ratio of 1∶1 showed the best photocatalytic performance and it could decolorize the RhB completely in 6 min under visible light illumination. This is because that the urchin-like TiO₂ nanomaterial can provide more load sites than TiO₂ nanoparticle for loading Ag₃PO₄. And the hierarchical TiO₂ can also improve the contact between the surfaces of TiO₂ and Ag₃PO₄ so that the separated efficiency of photo-generated electrons-holes by Ag₃PO₄ is improved. Meanwhile during the photodegradation process, a little Ag⁺ on the surface of Ag₃PO₄ are gradually reduced to Ag⁰, by the plasma resonace effect of which, the absorption and conversion capability of the composite for photon are enhanced and the photocataly-tic performance of the composite material for degrading dyes is further enhanced.

Key words: Hierarchical TiO2, Ag3PO4, Visible-light photocatalysis, Interface effect, Heterojunction

中图分类号:

O645

TrendMD:

李卫兵, 冯昌, 岳继光, 华方霞, 补钰煜. TiO₂分级结构/Ag₃PO₄复合材料的可见光催化性能. 高等学校化学学报, 2015, 36(6): 1194.

LI Weibing, FENG Chang, YUE Jiguang, HUA Fangxia, BU Yuyu. Photocatalytic Performance of Hierarchical TiO₂/Ag₃PO₄Composite Under Visible-light Illumination^†. Chem. J. Chinese Universities, 2015, 36(6): 1194.

图/表 6

Fig.1 XRD patterns of pure PTHSs(a) and PTHSs/Ag3PO4 composites(b—d) n(PTHSs)∶n(Ag3PO4): b. 2∶1; c. 1∶1; d. 1∶2.

Fig.2 SEM images of PTHSs(A) and PTHSs/Ag3PO4 composites(B—D)Inset in (A) is an enlarged gragh of part of a PTHS particle. n(PTHSs)∶n(Ag3PO4): (B) 2∶1; (C) 1∶1; (D) 1∶2.

Fig.3 TEM images(A, B) and EDS spectrum(C) of the PTHSs/Ag3PO4(1∶1) composite (B) is the high resolution image of the framed part in (A).

Fig.4 UV-Vis diffuse reflectance spectra of pure PTHSs(a), different PTHSs/Ag3PO4 composites(b—d) and pure Ag3PO4(e)n(PTHSs)∶n(Ag3PO4): b. 2∶1; c. 1∶1; d. 1∶2.

Fig.7 Recycling test of PTHSs∶Ag3PO4(1∶1) for photocatalytic degradation of RhB under visible light

Fig.9 Proposed mechanism of PTHSs/Ag3PO4 composite materials for enhancing photocatalytic property

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TiO₂分级结构/Ag₃PO₄复合材料的可见光催化性能

Photocatalytic Performance of Hierarchical TiO₂/Ag₃PO₄Composite Under Visible-light Illumination^†

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