Fe3+ doped TiO2 nanotubes for combined adsorption–sonocatalytic degradation of real textile wastewater

Authors:   Yean Ling Pang, Ahmad Zuhairi Abdullah

Abstract:
Fe-doped titanium dioxide (TiO₂) nanotubes catalyst with large specific surface area and low band gap energy were successfully synthesized using sol–gel followed by hydrothermal method. The activity ofthe catalyst was assessed by examining the treatment of real textile wastewater through combined adsorption and heterogeneous sonocatalysis. Fe-doped TiO₂ nanotubes exhibited better removal efficiency in the case of pre-adsorption followed by sonocatalytic reaction as compared to the simultaneous adsorption and sonocatalysis system. Pre-adsorption on TiO₂ nanotubes was found to promote sonocatalytic degradation and the latter process could be considered as a surface-catalyzed reaction. Effect of the solution pH (3–11), catalyst dosage (2–10 g/L) and hydrogen peroxide (H₂O₂) dosage (20–80 mM) on the adsorption–sonocatalysis for the treatment of a real textile wastewater were investigated in detail. The best degradation efficiency can be achieved at solution pH of 3, 6 g/L of Fe-doping, 40 mM of H₂O₂, an ultrasonic frequency of 35 kHz and an output power of 50W after 1 h of adsorption followed by 3 h of ultrasonic irradiation under continuous aeration. The color, COD and TOC removals were 79.9%, 59.4% and 49.8%, respectively. In short, adsorption followed by sonocatalytic degradation in the presence of Fe-doped TiO₂ nanotubes showed great potential for efficient treatment of real textile wastewater.

Keywords:
Combined adsorption–sonocatalysis
Fe-doped
TiO₂ nanotubes
Characteristics
Catalytic activity
Real textile wastewater

Published in: Applied catalysis B: Environmental  (Volume 129, Pages 1-614, 17 January 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Fe3+ doped TiO2 nanotubes for combined adsorption–sonocatalytic degradation of real textile wastewater

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