Journal
CHEMOSPHERE
Volume 188, Issue -, Pages 557-566Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.09.019
Keywords
Pyrite; Sulfur; Fenton-like; Alkaline conditions; Mechanisms
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Funding
- Natural Science Foundation of China [41572211]
- Fundamental Research Funds for the Central Universities [0400219346]
- National Key Technology R&D Program of China [2015BAL01B03-04]
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The Fenton-like reactions catalyzed by pyrite can efficiently degrade organic contaminants by oxidation process. When chloramphenicol (CAP) was exposed to the pyrite-H2O2 system, the CAP removal rate rapidly reached 100% however slowed to a halt at alkaline conditions. Results indicated that by adding S(-II) in pyrite-H2O2 system improved the oxidation efficiency of CAP at alkaline conditions. The transformation of S-2(2-) and S-n(2-) observed by X-ray photoelectron spectroscopy (XPS), confirmed that amorphous iron polysulfide (FeSn) was freshly generated on the pyrite surface. The availability of S(-II) promoted the generation of FeSn. Besides, S(-II) played a role in accelerating the Fe(III)/Fe(II) cycles. The potential of S(-II) activating H2O2 to generate hydroxyl radicals (center dot OH), which was confirmed by electron spin resonance (ESR) spectroscopy, quenching experiments, and trapping experiments, have supported the proposed mechanisms. This study came up with an efficient way of enhancing Fenton-like reactions by pyrite catalyzed at alkaline conditions, by adding S(-II) in the system. The new findings have implications for sulfide minerals, their interactions with pollutants, and the transformation products of sulfur in systems where Fe species are also present. (C) 2017 Elsevier Ltd. All rights reserved.
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