Chemically modified amino porphyrin/TiO2 for the degradation of Acid Black 1 under day light illumination

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2017-04, Vol.176, p.134-141
• Main Authors: Krishnakumar, Balu, Balakrishna, Avula, Arranja, Cláudia T., Dias, Carlos M.F., Sobral, Abilio J.F.N.
• Format: Article
• Language: English
• Subjects: Direct sun light; GPTMS; TiO2; TPAPP/TiO2
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2017.01.019

In this paper, for the first time, chemically modified 5,10,15,20-meso-tetra-(para-amino)-phenyl-porphyrin/TiO2 (TPAPP/TiO2) was prepared and used for the degradation of an azo dye Acid Black 1 (AB 1) under direct sunlight. Initially, TiO2 was prepared by sol-gel method. Before making a TPAPP/TiO2 composite, the surface modification of TiO2 was carried out with glycidoxypropyltrimethoxy silane (GPTMS) which acts as a coupling agent. This is an epoxy terminated silane and could easily bond to the amino group of TPAPP through epoxy cleavage. The formation of TPAPP/TiO2 was confirmed by different characterization techniques such as FT-IR, XRD, SEM and DRS. The photocatalytic activity of TiO2 was highly influenced by TPAPP. A mechanism was proposed for AB 1 degradation by TPAPP/TiO2 under sun light. [Display omitted] •5,10,15,20-meso-tetra-(para-amino)-phenyl-porphyrin/TiO2 was chemically prepared.•The reaction was performed through glycidoxypropyltrimethoxy silane as a binder.•TPAPP/TiO2 effectively photodegraded Acid Black 1 dye.