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Effect of mixing on reductive dechlorination of persistent organic pollutants by Fe/Pd nanoparticles
Author(s) -
Moujahid Abdellatif,
Bang John J.,
Yan Fei
Publication year - 2019
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.1002/wer.1018
Subject(s) - bimetallic strip , chemistry , nanoparticle , reductive dechlorination , aldrin , environmental chemistry , degradation (telecommunications) , pollutant , palladium , catalysis , nuclear chemistry , organic chemistry , biodegradation , nanotechnology , pesticide , materials science , telecommunications , dieldrin , computer science , agronomy , biology
Herein, we report the comparison of two different mixing methods for reductive dechlorination of gamma‐hexachlorocyclohexane (γ‐ HCH ), aldrin, and p, p’‐dichlorodiphenyl‐trichloroethane (p, p’‐ DDT ), using iron/palladium (Fe/Pd) bimetallic nanoparticles. A noticeable enhancement of the reaction rate was found when the reductive dechlorination reaction was carried out in an ultrasound bath as compared with a platform shaker. These enhancements could be attributed to (a) the continuous cleaning and chemical activation of the surfaces of nanoscale Fe/Pd bimetallic nanoparticles by the combined chemical and physical effects of acoustic cavitation; and (b) the accelerated mass transport rates of target POP s to the surfaces of the Fe/Pd nanoparticles. Finally, the degradation intermediates and final products were determined by gas chromatography/mass spectrometry ( GC / MS ) analysis and the plausible degradation pathways for γ‐ HCH , aldrin, and p, p’‐ DDT by Fe/Pd bimetallic nanoparticles were proposed. Practitioner points Exposure to POPs is a resilient global environmental and health issue. Fe/Pd bimetallic nanoparticles demonstrated > 90 % removal of POPs in the first 30 minutes of the reaction via ultrasonic mixing. GC‐MS analyses provided verification of POPs degradation intermediates and final products.