Three Dimensional Ag2O/TiO2 Type-II (p-n) Nanoheterojunctions for Superior Photocatalytic Activity

被引：383

作者：

Sarkar, Debabrata ^{[1
]}

Ghosh, Chandan. K. ^{[1
]}

Mukherjee, S. ^{[1
]}

Chattopadhyay, Kalyan K. ^{[1
,2
]}

机构：

[1] Jadavpur Univ, Sch Mat Sci & Nanotechnol, Kolkata 700032, India

[2] Jadavpur Univ, Thin Film & Nanosci Lab, Dept Phys, Kolkata 700032, India

来源：

ACS APPLIED MATERIALS & INTERFACES | 2013年 / 5卷 / 02期

关键词：

nanoheterojunctions; 3D p-type Ag2O/n-type TiO2; UV photocatalysis; HOLLOW MICROSPHERES; HETEROJUNCTION; TIO2; NANOCOMPOSITE; NANOPARTICLES; ENHANCEMENT; COMPOSITE; EMISSION; FACETS; WATER;

D O I：

10.1021/am302136y

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Type-II p-n junction three-dimensional Ag2O/TiO2 microspheres have been fabricated by assembling p-type nanoparticle on n-type TiO2 3D microsphere. Ag2O/TiO2 microsphere nanoheterojunctions were obtained by hydrothermal synthesis of TiO2 microspheres at 180 degrees C followed by photoreduction of AgNO3. The samples were carefully characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field-emission scanning electron microscopy (FESEM), and energy dispersive X-ray analysis (EDX). The photocatalytic activity toward degradation of methyl orange (MO) aqueous solution under UV light was investigated. The result showed that type-II p-n nanoheterojunctions Ag2O/TiO2 significantly enhanced the photocatalytic degradation compared to n-type TiO2 microsphere. It was found that the photocatalytic degradation followed the pseudo first-order reaction model. In particular, heterostructure with molar ratio of TiO2 and AgNO3 of 4:1 exhibited best photocatalytic activity and the corresponding apparent first-order rate constant of 0.138 min(-1) which is 4 times than that of pure n-type microsphere.

引用

页码：331 / 337

页数：7

共 48 条

[31] Controllable preferential-etching synthesis and photocatalytic activity of porous ZnO nanotubes [J].

Wang, Hongqiang ;

Li, Guanghai ;

Jia, Lichao ;

Wang, Guozhong ;

Tang, Chunjuan .

JOURNAL OF PHYSICAL CHEMISTRY C, 2008, 112 (31) :11738-11743

[32] A Novel and Highly Efficient Photocatalyst Based on P25-Graphdiyne Nanocomposite [J].

Wang, Shuo ;

Yi, Luoxin ;

Halpert, Jonathan E. ;

Lai, Xiaoyong ;

Liu, Yuanyuan ;

Cao, Hongbin ;

Yu, Ranbo ;

Wang, Dan ;

Li, Yuliang .

SMALL, 2012, 8 (02) :265-271

[33]

Wang XH, 2011, NAT PHOTONICS, V5, P480, DOI [10.1038/nphoton.2011.123, 10.1038/NPHOTON.2011.123]

[34] SURFACE CHARACTERIZATION STUDY OF THE THERMAL-DECOMPOSITION OF AG2O [J].

WEAVER, JF ;

HOFLUND, GB .

CHEMISTRY OF MATERIALS, 1994, 6 (10) :1693-1699

[35] Photocatalytic Carbon-Nanotube-TiO2 Composites [J].

Woan, Karran ;

Pyrgiotakis, Georgios ;

Sigmund, Wolfgang .

ADVANCED MATERIALS, 2009, 21 (21) :2233-2239

[36] A green and facile self-assembly preparation of gold nanoparticles/ZnO nanocomposite for photocatalytic and photoelectrochemical applications [J].

Xiao, Fangxing ;

Wang, Fengchang ;

Fu, Xianzhi ;

Zheng, Yi .

JOURNAL OF MATERIALS CHEMISTRY, 2012, 22 (07) :2868-2877

[37] Self-assembly fabrication of 3D porous quasi-flower-like ZnO nanostrip clusters for photodegradation of an organic dye with high performance [J].

Xing, Zhoujing ;

Geng, Baoyou ;

Li, Xuelian ;

Jiang, Han ;

Feng, Chengxin ;

Ge, Ting .

CRYSTENGCOMM, 2011, 13 (06) :2137-2142

[38] Enhanced photocatalytic activity of hierarchical ZnO nanoplate-nanowire architecture as environmentally safe and facilely recyclable photocatalyst [J].

Xu, Feng ;

Shen, Yuting ;

Sun, Litao ;

Zeng, Haibo ;

Lu, Yinong .

NANOSCALE, 2011, 3 (12) :5020-5025

[39] Synthesis, characterization and photocatalytic property of AgBr/BiPO4 heterojunction photocatalyst [J].

Xu, Hui ;

Xu, Yuanguo ;

Li, Huaming ;

Xia, Jiexiang ;

Xiong, Jun ;

Yin, Sheng ;

Huang, Chuanjing ;

Wan, Huilin .

DALTON TRANSACTIONS, 2012, 41 (12) :3387-3394

[40] ZnO-based hollow nanoparticles by selective etching: Elimination and reconstruction of metal-semiconductor interface, improvement of blue emission and photocatalysis [J].

Zeng, Haibo ;

Cai, Weiping ;

Liu, Peisheng ;

Xu, Xiaoxia ;

Zhou, Huijuan ;

Klingshirn, Claus ;

Kalt, Heinz .

ACS NANO, 2008, 2 (08) :1661-1670

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