Journal
CHEMOSPHERE
Volume 184, Issue -, Pages 879-883Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.06.075
Keywords
Ball milling; Mechanical activation; Defect engineering; Persistent organic pollutants (POPS)
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Funding
- National Natural Science Fund [21477060]
- Tsinghua University Initiative Scientific Research Program [20131089251]
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Mechanochemical activation of metal oxides is studied by a novel methodology based on solid state reaction with a stable radical specie. Such approach corroborates that vacancy formation by high energy ball milling, also in nonreducible oxides, is responsible for electron release on particles' surfaces. This finding suggests a new defect engineering strategy to improve effectiveness of metal oxides as co-milling reagent for halogenated organic pollutant destruction. Results prove that high valent metal doping of a commonly employed co-milling reagent such as CaO determines 2.5 times faster pollutant degradation rate. This enhancement is due to electron-rich defects generated by the dopant; electrons are transferred to the organic pollutant thus causing its mineralization. The proposed strategy can be easily applied to other reagents. (C) 2017 Elsevier Ltd. All rights. reserved.
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