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Enhanced Photocatalytic Activity of an Acid‐modified TiO 2 Surface for Degradation of the Azo Dye Remazol Red
Author(s) -
Afrin Unjila,
Mian Mohammad Rasel,
Breedlove Brian K.,
Hossain Md. Mufazzal
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701522
Subject(s) - photodegradation , photocatalysis , hydrochloric acid , scanning electron microscope , catalysis , materials science , nuclear chemistry , degradation (telecommunications) , photochemistry , chemistry , inorganic chemistry , organic chemistry , telecommunications , computer science , composite material
Effects of acid‐modified crystalline titania (TiO 2 ) on the photocatalytic degradation of the azo dye Remazol Red (RR) were investigated in order to design an effective catalyst for removing azo dye compounds from contaminated waste streams. The mechanism for RR photodegradation with acid‐modified TiO 2 (m‐TiO 2 ) was investigated using UV‐visible spectroscopy and scanning electron microscopy (SEM). Modification of the TiO 2 surface with hydrochloric acid (HCl) resulted in enhanced RR photodecomposition in water. The RR photodecomposition reactions are 19% more efficient than those with pure commercial TiO 2 under UV radiation. The coupling between RR and TiO 2 was improved by treating TiO 2 with HCl. As a result, transfer of electrons from the conduction band of TiO 2 to the RR was enhanced. The modification of crystalline TiO 2 surface with HCl is a useful method for enhancing photodegradation of RR.