Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (2): 330-336.DOI: 10.1016/S1872-2067(16)62580-9

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Effect of carrier and axial ligand on the photocatalytic activity of cobalt thioporphyrazine

Yi Liu, Xuanmu Zhou, Zhehui Zhang, Bingguang Zhang, Kejian Deng   

  1. Key Laboratory of Catalysis and Material Sciences of the State Ethnic Affairs Commission & Ministry of Education, College of Chemistry and Material Sciences, South-Central Universities for Nationalities, Wuhan 430074, Hubei, China
  • Received:2016-08-30 Revised:2016-10-15 Online:2017-02-18 Published:2017-03-14
  • Contact: 10.1016/S1872-2067(16)62580-9
  • Supported by:

    This work was supported by National Natural Science Foundation of China (20977115, 21272281), Natural Science Foundation of Hubei Province (2014CFB919), and the Science and Technology Plan Innovation Team of Wuhan City (2015070504020220).

Abstract:

The photocatalytic activity of cobalt octakis(butylthio) porphyrazine (CoPz(BuS)8) was assessed through photodegradation of the dye rhodamine B (RhB) in water under irradiation with a Xe lamp and aerated conditions. The photocatalytic activity of CoPz(BuS)8 loaded on Al2O3 or SiO2@Fe3O4 nanoparticles or coordinated with an axial azide ligand was also investigated. The results demonstrated that the photocatalytic activity of CoPz(BuS)8 loaded on Al2O3 was higher than that loaded on SiO2@Fe3O4. The kinetic curves of RhB degradation in aqueous solutions at different pH indicated the pseudo first-order kinetics of the reaction. The highest degradation rate for CoPz(BuS)8 loaded Al2O3 at pH=4 after 160 min was 84.6%. However, the advantages of easier separation and recycling as well as the ability to terminate the reaction at any time for the CoPz(BuS)8 loaded SiO2@Fe3O4 cannot be ignored. When electron-rich NaN3 was coordinated with CoPz(BuS)8 as an axial ligand and loaded on Al2O3, the resulting catalyst produced more active oxygen species such as O2- and HO· to promote the quicker degradation of RhB than that by the other catalysts. For the N3-coordinated CoPz(BuS)8 loaded on Al2O3, the reactions at pH=4 and 7 distinctly deviated from first-order kinetics, and the degradation rate reached 77.6% after 80 min at pH=4.

Key words: Cobalt thioporphyrazine, Photocatalytic activity, Alumina, SiO2@Fe3O4, Axial direction ligand, Sodium azide