Low frequency sonocatalytic degradation of Azo dye in water using Fe-doped zeolite Y catalyst

Abstract

Sonocatalytic degradation of acid red B (ARB) dye was investigated using Fe doped zeolite Y catalysts with the assistance of low frequency (20 kHz) ultrasonic irradiation. Low concentration of Fe ions from different precursors was loaded onto the zeolite using wet impregnation method. Catalytic degradation of ARB dye was found to be accelerated by the reaction between Fe (II) and Fe (III) ions and hydrogen peroxide (H2O2) generated in situ by the ultrasound-mediated dissociation of water molecules. Fe (II)/Y exhibited higher degradation efficiency at the beginning of the reaction but achieved almost similar degradation at the end of the process. The increase of pH significantly decreased the degradation efficiency of ARB dye and strongly affected the leaching and catalyst stability. The highest efficiency was achieved at an initial pH of 3 with nearly 100% degradation in less than 60 min. Both catalysts showed no significant changes in terms of their mean particle sizes before and after reaction. Finally, Fe (III)/Y showed better performance evaluated based on leaching of Fe and also catalyst reusability. Only minor physical changes occurred during the degradation process for four consecutive runs of reaction.

Rapid Degradation of Methyl Orange by Ag Doped Zeolite X in the Presence of Borohydride

“…This shows that zeolite X does not adsorb and degrade the MO molecules efficiently. Similar results were also reported by Jamalludin and Abdullah [25] who proposed that azo dyes cannot be adsorbed into or within the zeolites, rather, the dyes are deposited on the external surface of the zeolites. Previous works have noted that the average molecular size of MO in aqueous solution is 2.61 nm [26] whereas the size of the pores of zeolite X is approximately 0.73 nm [27].…”

Recent advances and prospects of catalytic advanced oxidation process in treating textile effluents

“…Zeolites contain transition metal ions and have been recognized as an efficient heterogeneous catalyst for the degradation of textile industrial effluent (NezamzadehEjhieh and Banan 2011, Nezamzadeh-Ejhieh and Moazzeni 2013, Apollo et al 2014, Jamalluddin and Abdullah 2014, Panic and Velickovic 2014. Most of the transition metal/zeolite catalysts are bifunctional (i.e.…”

“…Combinations of US/Fenton reagent have been proven the simplest way to generate ·OH for textile wastewater treatment (Lin et al 2008, Jamalluddin andAbdullah 2014). Fenton reagent along with US decolorized RB5 completely at the optimum experimental conditions of pH 3, 8.82 mmol/l H 2 O 2 , and 0.5 mm Fe 2+ (Saravanan and Sivasankar 2014).…”

Preparation of Er3+:Y3Al5O12/KNbO3 composite and application in innocent treatment of ketamine by using sonocatalytic decomposition method

“…During ultrasonic cavitation the produced "hot spot" can give transient high temperatures (5000 K) and high pressures (1000 atm) [26][27][28][29]. The transient high temperatures cause the thermal dissociation of water molecules to produce hydroxyl radicals ( • OH) which can degrade and destroy narcotic drugs [30,31]. Besides, the sonoluminescence resulted from ultrasonic cavitation effect can generate light with a comparatively wide range of wavelengths, which can excite the aromatic organic pollutants to become unstable in energy.…”