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Improved photocatalytic reactivity of ZnO photocatalysts decorated with Ni and their magnetic recoverability

Published online by Cambridge University Press:  11 May 2015

Guoliang Yang ,
Qi Liu ,
Yinghuan Fu ,
Hongchao Ma ,
Chun Ma ,
Xiaoli Dong ,
Xinxin Zhang  and
Xiufang Zhang
Guoliang Yang
Affiliation:
Department of Environmental Engineering, School of Chemistry Engineering & Material, Dalian Polytechnic University, Ganjinzi District, Dalian 116034, People's Republic of China
Qi Liu
Affiliation:
Department of Environmental Engineering, School of Chemistry Engineering & Material, Dalian Polytechnic University, Ganjinzi District, Dalian 116034, People's Republic of China
Yinghuan Fu
Affiliation:
Department of Environmental Engineering, School of Chemistry Engineering & Material, Dalian Polytechnic University, Ganjinzi District, Dalian 116034, People's Republic of China
Hongchao Ma*
Affiliation:
Department of Environmental Engineering, School of Chemistry Engineering & Material, Dalian Polytechnic University, Ganjinzi District, Dalian 116034, People's Republic of China
Chun Ma
Affiliation:
Department of Environmental Engineering, School of Chemistry Engineering & Material, Dalian Polytechnic University, Ganjinzi District, Dalian 116034, People's Republic of China
Xiaoli Dong*
Affiliation:
Department of Environmental Engineering, School of Chemistry Engineering & Material, Dalian Polytechnic University, Ganjinzi District, Dalian 116034, People's Republic of China
Xinxin Zhang
Affiliation:
Department of Environmental Engineering, School of Chemistry Engineering & Material, Dalian Polytechnic University, Ganjinzi District, Dalian 116034, People's Republic of China
Xiufang Zhang
Affiliation:
Department of Environmental Engineering, School of Chemistry Engineering & Material, Dalian Polytechnic University, Ganjinzi District, Dalian 116034, People's Republic of China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

In this paper, the Ni-decorated ZnO photocatalysts with magnetic separable characteristics were prepared by a simple replacing-hydrothermal process for the first time. The as-synthesized composites were characterized by powder x-ray diffraction, UV–visible diffuse reflectance spectroscopy, x-ray photoelectron spectroscopy, scanning electron microscope, transmission electron microscopy, and so on. It is found that the introduction of Ni (as Ni0 and Ni2+ forms) turned the morphologies of ZnO photocatalysts, enhanced photoabsorption in a visible light region, and increased amount of surface adsorbed oxygen. The photodegradation test of anthraquinone dye (reactive brilliant blue KN-R) indicated that the Ni-decorated ZnO photocatalysts have better activities as compared to the ZnO reference. The enhancement of photocatalytic activity of Ni-decorated ZnO photocatalysts can be attributed to the existence of Ni2+ doping, Ni0/ZnO heterostructure, and abundant-adsorbed oxygen (as the electronic scavenges), which caused efficient separation of electron–hole pairs in Ni-decorated ZnO photocatalysts. Furthermore, the introduction of metallic Ni also endued ZnO with good magnetic recoverability. The re-collected experiments by external magnetic field indicated that Ni-decorated ZnO as a magnetically recoverable photocatalyst is acceptable.

Keywords

ZnOmagnetic recoverabilityNi-decoratedheterostructure
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 12 , 28 June 2015 , pp. 1902 - 1913
Copyright
Copyright © Materials Research Society 2015 

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