Zinc phthalocyanine sensitized g-C3N4 photocatalyst for exceptional photocatalytic hydrogen evolution and pollutant degradation

• Published in: International journal of hydrogen energy 2023-05, Vol.48 (43), p.16320-16329
• Main Authors: Hasnain Bakhtiar, Syed Ul, Zada, Amir, Raziq, Fazal, Ali, Sharafat, Ali Shah, Muhammad Ishaq, Ateeq, Muhammad, Khan, Muhammad, Alei, Dang, Fazil, Perveen, Naeem, Mohammad, Khan, Waliullah, Khan, Javed Ali, Nazir, Ruqia, Dong, Wen, Fu, Qiuyun
• Format: Article
• Language: English
• Subjects: 2,4-DCP degradation; Charge separation; H2 evolution; Super oxide anions; Zinc phthalocyanine
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2023.01.152

Here in this manuscript, the high charge conductivity and exceptionally wide range soalr light absorption of metal phthalocyanines were followed for boosted photocatalysis. Graphitic carbon nitride, g-C3N4 (CN) was thermally prepared from melamine and loaded with appropriate amount of zinc phthalocyanine (ZnPc) to form ZPCN nanocomposites. The fabricated samples were used to liberate hydrogen from water and decompose 2,4-dichlorphenol (2,4-DCP) pollutant under visible-light irradiation. The optimized nanocomposite (0.5ZPCN) purchased highly accelerated photocatalysis and liberated 90 μmol H2 in 1 h in the presence of methanol as sacrificial agent. The same nanocomposite also showed 85% decomposition efficiency for the degradation of 2,4-DCP pollutant. These enhanced catalytic activity of g-C3N4 functionalized with ZnPc are attributed to the exceptional visible light absorption and effective generation of super oxide ions and holes formed after charge transfer between g-C3N4 and ZnPc as confirmed from photoluminescence, fluorescent and electrochemical characterization of the nanophotocatalysts. The charge/radical trapping experiments confirmed that super oxide anions were the main oxidizing agents in the decomposition of 2,4-DCP. [Display omitted] •g-C3N4 was prepared successfully and loaded with zinc phthalocyanine.•The nanocomposites imparted boosted H2 evolution and pollutant degradation activities.•These activities are attributed to the extended light absorption and improved charge separation.•Superoxide anions were responsible for the degradation of 2,4-DCP.