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Enhanced photocatalytic activity in porphyrin-sensitized TiO2 nanorods

Published online by Cambridge University Press:  19 June 2017

Wei Zhang ,
Chen Wang ,
Xiao Liu  and
Jun Li
Wei Zhang
Affiliation:
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, School of Chemistry & Materials Science, Northwest University, Xi’an, Shaanxi 710069, China
Chen Wang*
Affiliation:
School of Chemical Engineering, Northwest University, Xi’an, Shaanxi 710069, People’s Republic of China
Xiao Liu
Affiliation:
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, School of Chemistry & Materials Science, Northwest University, Xi’an, Shaanxi 710069, China
Jun Li*
Affiliation:
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, School of Chemistry & Materials Science, Northwest University, Xi’an, Shaanxi 710069, China
*
b) e-mail: 510144248@qq.com
a) Address all correspondence to these authors. e-mail: junli@nwu.edu.cn
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Abstract

Two novel porphyrins (5,10,15,20-tetra(3-(carboethoxymethyleneoxy)phenyl)porphyrin, H2TEPp and 5,10,15,20-tetra(3-(carboxymethyleneoxy)phenyl)porphyrin, H2TCPp) and their copper(II) porphyrins (CuTEPp, CuTCPp) were synthesized. With these porphyrins, four new porphyrin-sensitized TiO2 nanorod composites (H2TEPp/TiO2, H2TCPp/TiO2, CuTEPp/TiO2, and CuTCPp/TiO2) were prepared and characterized by methods of XRD, SEM, TEM, FT-IR, UV-vis DRS, nitrogen adsorption–desorption and fluorescence spectra. Besides, the photocatalytic activity and stability of the composites were assessed in the degradation of 4-nitrophenol (4-NP). The results indicate that the morphologies and structures of these composites are less influenced by the loaded porphyrins or copper porphyrins compared with the nanorods TiO2 (anatase). The porphyrin or copper porphyrin molecules are confirmed to bond on the surface of TiO2 through carboxyl group, which is beneficial to the electron transfer between porphyrin and TiO2. All composites exhibit enhanced photoactivities compared with the bare TiO2 nanorods. The possible reason is that the recombination of photoproduced electron–hole has been controlled effectively in these composites, which can be seen from their decreased fluorescence emission. The stability results of composites show that they still hold considerable photocatalytic activities after six cycling experiments.

Keywords

photocatalystsTiO2porphyrincopper(II) porphyrinphotodegradation
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 14 , 28 July 2017 , pp. 2773 - 2780
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Xiaobo Chen

References

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