Sulfate radicals induced degradation of tetrabromobisphenol A with nanoscaled magnetic CuFe2O4 as a heterogeneous catalyst of peroxymonosulfate

Authors:  Yaobin Ding, Lihua Zhu, Nan Wang, Heqing Tang

Abstract:
CuFe₂O₄ magnetic nanoparticles (MNPs) were prepared by sol–gel combustion method with copper and iron nitrates as metal precursors and citrate acid as a complex agent. The obtained CuFe₂O₄ MNPs were characterized by scanning electron microscopy, X-ray diffractometry, Fourier transform infrared spectroscopy, Fourier transform Raman spectroscopy and X-ray photoelectron spectroscopy. It was found that CuFe₂O₄ MNPs could effectively catalyze peroxymonosulfate (PMS)to generate sulfate radicals (SO₄ •−)to degrade tetrabromobisphenol A (TBBPA). The added TBBPA (10 mg L−1) was almost completely removed (with a removal of 99%) in 30 min by using 0.1 g L−1 CuFe₂O₄ MNPs and 0.2 mmol L−1 PMS. With higher addition of PMS (1.5 mmol L−1), the degradation yielded a TOC removal of 56% and a TBBPA debromination ratio of 67%. The effect of catalyst calcination temperature, catalyst load, PMS concentration and reaction temperature was investigated on the catalytic activity of CuFe₂O₄ MNPs. The highly catalytic activity of CuFe₂O₄ MNPs possibly involved the activation of PMS by both Cu(II) and Fe(III) in CuFe₂O₄ MNPs. Based on intermediate detections, the degradation pathway of TBBPA in the CuFe₂O₄ MNPs/PMS system was proposed.

Keywords:
Tetrabromobisphenol A
Oxidative degradation
Peroxymonosulfate
CuFe₂O₄
Sol–gel combustion method

Published in: Applied catalysis B: Environmental  (Volume 129, Pages 1-614, 17 January 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Sulfate radicals induced degradation of tetrabromobisphenol A with nanoscaled magnetic CuFe2O4 as a heterogeneous catalyst of peroxymonosulfate

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