Electrochemical mineralization of methylene blue dye using electro-Fenton oxidation catalyzed by a novel sepiolite/pyrit
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ORIGINAL PAPER
Electrochemical mineralization of methylene blue dye using electro‑Fenton oxidation catalyzed by a novel sepiolite/pyrite nanocomposite M. Fayazi1 · M. Ghanei‑Motlagh2 Received: 5 February 2020 / Revised: 17 March 2020 / Accepted: 13 April 2020 © Islamic Azad University (IAU) 2020
Abstract In the present study, heterogeneous electro-Fenton (EF) treatment using a sepiolite/pyrite (Sep/FeS2) nanocomposite was employed to degrade methylene blue (MB) dye. The morphology and structure properties of the prepared catalyst were thoroughly studied by field emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy and elemental mapping analysis. The EF studies were carried out in an undivided electrochemical cell equipped with a platinum (Pt) sheet as anode and graphite plate as cathode. Effects of initial pH, applied current intensity, catalyst dose and initial dye concentration on the mineralization of MB were examined, and their values were determined as 3.0, 1.0 g L−1, 50 mg L−1 and 150 mA, respectively. An almost total mineralization was acquired for a 50 mg L−1 MB solution in 75 min reaction time. The degradation mechanism using the Sep/FeS2-EF treatment was suggested with the analysis of intermediate products by liquid chromatography–mass spectrometry. Accounting for the high catalytic capability, chemical constancy and inexpensive cost, the Sep/FeS2 nanocomposite has great potential working as an EF catalyst for industrial applications. Keywords Electro-Fenton · Hydroxyl radicals · Pyrite · Nanocomposite · Dye mineralization
Introduction Water pollution with toxic and non-biodegradable organic compounds, including synthetic dyes, needs the design and development of efficient and sustainable strategies capable for degradation of these contaminants (Barhoumi et al. 2016). Facing this environmental issue, advanced oxidation processes (AOPs) have received extensive attention for
Editorial responsibility: J Aravind. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13762-020-02749-2) contains supplementary material, which is available to authorized users. * M. Fayazi [email protected]; [email protected] 1
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Department of Environment, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
the treatment of various organic pollutants in recent years (Bounab et al. 2016; Nazari and Setayesh 2019). These methods are based on highly reactive and non-selective hydroxyl radicals ( HO⋅ ), which are able to oxidize organic pollutants to CO2, H2O and inorganic ions (Fayazi et al. 2016; Khajouei et al. 2019). Among them, electrochemical AOP (EAOP) has proved to be an efficient procedure for the remediation of wastewaters contaminated with toxic organic pollutants, including dyes residues (Esfahani et al. 2019; Pajootan et al. 2014). The most common EAOP is considered to be the process known as electro
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