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Doping iodine in CdS for pure hexagonal phase, narrower band gap, and enhanced photocatalytic activity

Published online by Cambridge University Press:  23 February 2011

Zhihui Ai ,
Man Wang ,
Zhi Zheng  and
Lizhi Zhang
Zhihui Ai
Affiliation:
Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People’s Republic of China
Man Wang
Affiliation:
Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People’s Republic of China
Zhi Zheng*
Affiliation:
Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang 461000, People’s Republic of China
Lizhi Zhang*
Affiliation:
Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People’s Republic of China
*
a)Address all correspondence to these authors. e-mail: zhanglz@mail.ccnu.edu.cn
b)e-mail: zhengzhi9999@yahoo.com.cn
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Abstract

Iodine-doped CdS (I-CdS) with controllable morphologies, pure hexagonal phase, and enhanced photocatalytic activity was synthesized via a mild hydrothermal process with polyvinylpyrrolidone-iodine (PVP-I) acting as the template-directing reagent and iodine source. The morphologies of the as-prepared samples could be adjusted from irregular cone-shaped particles to uneven microspheres, further to smooth microspheres, while the crystal phases were also transformed from mixed cubic and hexagonal phases to pure hexagonal phase upon increasing the molar ratio of PVP-I to Cd2+ from 0 to 2. The iodine doping could result in red shift of the absorption edges and band gap narrowing of the I-CdS samples. Importantly, a critical point of 0.5 of molar ratio of PVP-I to Cd2+ for iodine doping was found to be necessary for obtaining a pure hexagonal phase that facilitates the improving of photocatalytic activity on the degradation of Rhodamine B in aqueous solution under visible light irradiation.

Keywords

Chemical SynthesisCrystal GrowthHydrothermal

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Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 5 , 14 March 2011 , pp. 710 - 719
Copyright
Copyright © Materials Research Society 2011

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