Title: Textile dye degradation in a novel photocatalytic baffled reactor using immobilised TiO₂ nanoparticles

Authors: Payam Zanganeh Ranjbar; Bita Ayati; Hossein Ganjidoust

Addresses: Civil and Environmental Engineering Faculty, Tarbiat Modares University, Tehran 14115-397, Iran; Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht 3756, Guilan, Iran ' Civil and Environmental Engineering Faculty, Tarbiat Modares University, Tehran 14115-397, Iran ' Civil and Environmental Engineering Faculty, Tarbiat Modares University, Tehran 14115-397, Iran

Abstract: Herein, a novel photocatalytic baffled reactor (PBR) has been used to degrade the acid orange 52 azo dye. According to the results of the experiments conducted with the aim of maintaining minimum decolourisation time as well as minimising the level of energy consumption, the variables of initial dye concentration (50 mg/L), pH (3), flow rate (14.4 L/h), current length (150 cm), dissolved oxygen (5 mg/L), immobilised TiO₂ concentration (20 g/m²), and temperature (25°C) were obtained as the optimum condition in that 50 mg/L of dye at the pH of 3 and 48 W UV-C irradiation became colourless after 9.5 h. The degradation followed satisfactorily the pseudo-first-order kinetic according to Langmuir-Hinshelwood model and with increasing the initial dye concentration from 5 mg/L to 50 mg/L, the kinetic constant decreased from 1.086 h^-1 to 0.4 h^-1. The decolourisation and COD removal of real textile wastewater of 89% and 64% were obtained respectively after UV irradiation for 9.5 h.

Keywords: azo dyes; acid orange 52; AO52; photocatalytic baffled reactor; PBR; decolourisation; titanium dioxide; wastewater treatment.

DOI: 10.1504/IJEWM.2022.122677

International Journal of Environment and Waste Management, 2022 Vol.29 No.3, pp.241 - 261

Received: 04 Jun 2019
Accepted: 13 Apr 2020
Published online: 05 May 2022 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article