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Foam fractionation of ZnO crystal growth and its photocatalysis of the degradation of methylene blue

Published online by Cambridge University Press:  11 July 2012

Shashi Bairagi Atla
Affiliation:
Department of Earth and Environmental Sciences, National Chung Cheng University, Minhsiung, Chiayi, 62102, Taiwan
Chien-Yen Chen*
Affiliation:
Department of Earth and Environmental Sciences, National Chung Cheng University, Minhsiung, Chiayi, 62102, Taiwan; and Department of Engineering, University of Cambridge, Cambridge, CB2 1PZ, UK
Chien-Cheng Chen
Affiliation:
Department of Biotechnology, National Kaohsiung Normal University, Yanchao Township, Kaohsiung County, 82444, Taiwan
Shao-Ju Shih
Affiliation:
Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Da’an Dist., Taipei 106, Taiwan
Pin-Yun Lin
Affiliation:
Department of Earth and Environmental Sciences, National Chung Cheng University, Minhsiung, Chiayi, 62102, Taiwan
Pei-Hua Chung
Affiliation:
Department of Earth and Environmental Sciences, National Chung Cheng University, Minhsiung, Chiayi, 62102, Taiwan
Jheng-Sian Yang
Affiliation:
Department of Earth and Environmental Sciences, National Chung Cheng University, Minhsiung, Chiayi, 62102, Taiwan
Akuri Satyanarayana Reddy
Affiliation:
Department of Chemistry, Graduate School of EEWS, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
Kai-Chien Cheng
Affiliation:
Department of Earth and Environmental Sciences, National Chung Cheng University, Minhsiung, Chiayi, 62102, Taiwan
Young-Fo Chang
Affiliation:
Department of Earth and Environmental Sciences, National Chung Cheng University, Minhsiung, Chiayi, 62102, Taiwan
*
a)Address all correspondence to this author. e-mail: chien-yen.chen@oriel.oxon.org
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Abstract

We report herein the crystal growth of ZnO nanoparticles by the foam fractionation method. In this study, the vertical column height of the foam was fixed and the velocity of the sparging air was varied, and the effect of foam flow rate on the synthesis of ZnO was investigated. The obtained ZnO consisted of aggregated platelets and had differing ultraviolet absorbances. The as-synthesized ZnO was hydrophobic because of the interaction between the anionic head groups of sodium dodecyl sulfate (SDS) and the ZnO under the precipitation conditions. The long chain of the SDS molecule was the cause of hydrophobicity. The contact angle of water was in the range of 95–105° for the obtained ZnO/SDS surface. The photocatalytic degradation efficiency of the as-synthesized (ZnO/SDS) and the calcined ZnO was investigated for methylene blue, and the calcined ZnO retained its activity even after three recycles.

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Articles
Copyright
Copyright © Materials Research Society 2012

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References

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