Article history: Magnetic Ni Fe/Fe O catalyst was prepared by using spent FeNi layered double hydroxide derived from 3 3 4 Received 19 November 2015 the adsorption of organic dyes as precursor via heat treatment under nitrogen atmosphere. X-ray diffrac- Received in revised form 13 January 2016 tion results indicated that the obtained materials were composed of Ni Fe and Fe O . Thermogravimetric 3 3 4 Accepted 19 January 2016 analysis, X-ray photoelectron spectroscopy, elemental analysis, and thermomagnetic curves characteri- Available online 22 January 2016 3+ 2+ zation results demonstrated that Fe and Ni could be reduced to low valence by organic contaminants, and the obtained materials possessed strong magnetism. Visible light assisted Fenton-like experiment Keywords: results showed that the obtained materials possessed high catalytic activities and the degradations at pH FeNi layered double hydroxide of 3–6 and pH 7 preferred to followed Langmuir–Hinshelwood and Eley–Rideal mechanism, respectively. Spent adsorbent reutilizing In addition, the possible effects of Fe and Ni species were brieﬂy discussed as well. On the other hand, Magnetic catalyst comparing to the heated products of FeNi layered double hydroxide the obtained materials presented Photo-Fenton much superiority including variety in metal valences, higher amount of −OH
Journal of Molecular Catalysis A: Chemical – Elsevier
Published: May 1, 2016
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