Water splitting from dye wastewater: A case study of BiOCl/copper(II) phthalocyanine composite photocatalyst

Authors:  Ling Zhang, Wenzhong Wang, Songmei Sun, Yuanyuan Sun, Erping Gao, Jie Xu

Abstract:
Oxygen evolution is frequently the bottleneck determining the efficiency in the overall photocatalytic water splitting. Herein, for the first time overall water splitting reaction to H₂ and O₂ is realized on BiOCl/CuPc (copper phthalocyanine) composite from RhB (rhodamine B) solution under simulated solar light irradiation. The photosensitized RhB dye molecules supplied photo-generated holes which took part in the reaction of O₂ evolution. By loading CuPc, the efficiency of H₂ evolution is improved. On the base of the greatly enhanced photocurrent density, the considerable enhancement of performance can be attributed to the quick transfer of photogenerated electrons from the photosensitizer to the CB (conduction band) of BiOCl. Furthermore, as active electron traps, the oxygen vacancies on the surface of the BiOCl photocatalyst promote the separation efficiency of photo-generated electrons and holes, resulting in high photoactivity. This study presents a way that organic dye wastewater will be a useful system for the overall photocatalytic water splitting reaction to H₂ and O₂. 

Keywords:
BiOCl
Copper phthalocyanine
Photocatalytic
Water splitting
Photosensitizer

Published in: Applied Catalysis B: Environmental (Volumes 132–133, Pages 1-552, 27 March 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Water splitting from dye wastewater: A case study of BiOCl/copper(II) phthalocyanine composite photocatalyst

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