Catalytic decomposition of 2-chlorophenol using an ultrasonic-assisted Fe3O4�TiO2@MWCNT system: Influence factors, pathway and mechanism study

Dobaradaran, S. and Nodehi, R.N. and Yaghmaeian, K. and Jaafari, J. and Niari, M.H. and Bharti, A.K. and Agarwal, S. and Gupta, V.K. and Azari, A. and Shariatifar, N. (2018) Catalytic decomposition of 2-chlorophenol using an ultrasonic-assisted Fe3O4�TiO2@MWCNT system: Influence factors, pathway and mechanism study. Journal of Colloid and Interface Science, 512. pp. 172-189.

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Abstract

As a reusable sonocatalyst, magnetically separable Fe3O4�TiO2@MWCNT (FMT) was synthesized by an ultrasound-assisted wet impregnation method and was evaluated in the removal of 2-chlorophenol (2CP). Physical and chemical properties of the catalyst composite materials were investigated by all catalysts were systematically characterized using Transmission Electron Microscopy (TEM), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), Energy Dispersive X-ray Analysis (EDX), Dynamic light scattering (DLS), and N2-physisorption. The efficiency and kinetics of 2CP removal by FMT-assisted sonocatalysis (FMT-US) was systematically investigated under various operational parameters i.e. pH, FMT and 2CP concentration, temperature and ultrasonic power. The results indicated that 0.4 g L�1 FMT dosage, pH 5, temperature of 35 °C as well as 50 w ultrasound power are the most favorable conditions for the degradation of the 2CP. Furthermore, both of the superoxide and hydroxyl radicals were produced in the reaction, however, superoxide radicals were assumed to be the dominating reactive species for the 2CP degradation, according to the scavenging tests and electron paramagnetic resonance tests. Moreover, the FMT catalyst exhibited a high reusability and stability in the US/FMT system during the five repetitive experiments. The intermediate products were identified by GC�MS, thereby a possible degradation pathway is proposed. The chemical oxygen demand (COD) and corresponding total organic carbon (TOC) removal efficiencies were 64.9 and 56.7, respectively. Finally, toxicity tests showed that the toxicity of the solution increased during the first 5 min and then decreased significantly with the progress of the oxidation. The mechanisms of ultrasound irritation enhanced FMT activation were also proposed. © 2017 Elsevier Inc.

Item Type: Article
Additional Information: cited By 7
Uncontrolled Keywords: Carbon; Catalysis; Catalysts; Chemical analysis; Chemical oxygen demand; Decomposition; Dynamic light scattering; Electron microscopy; Energy dispersive X ray analysis; High resolution transmission electron microscopy; Light scattering; Magnetic resonance; Multiwalled carbon nanotubes (MWCN); Organic carbon; Oxygen; Paramagnetic resonance; Reusability; Scanning electron microscopy; Titanium dioxide; Toxicity; Transmission electron microscopy; Ultrasonics; X ray analysis; X ray diffraction, 2-clorophenol; Catalytic decomposition; Energy dispersive x-ray analysis (EDX); Magnetically separable; Operational parameters; Physical and chemical properties; Ultrasound irradiation; Wet impregnation method, X ray photoelectron spectroscopy, 2 chlorophenol; carbon; hydroxyl radical; iron oxide; multi walled nanotube; nanocrystal; oxygen; superoxide; titanium dioxide nanoparticle, acute toxicity; aqueous solution; Article; chemical oxygen demand; controlled study; decomposition; degradation; dispersity; electron spin resonance; energy dispersive X ray spectroscopy; hydrodynamics; magnetic field; mass fragmentography; nanocatalyst; particle size; pH; photon correlation spectroscopy; physical chemistry; priority journal; scanning electron microscopy; total organic carbon; toxicity testing; transmission electron microscopy; X ray diffraction; X ray photoelectron spectroscopy
Subjects: Health Professions
Divisions: Faculty of Health > Department of Environmental health
Depositing User: ART . editor
Date Deposited: 16 Apr 2019 07:59
Last Modified: 16 Apr 2019 07:59
URI: http://eprints.kaums.ac.ir/id/eprint/3996

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