Advanced Method for Catalytic Dechlorination
of Polychlorinated Biphenyls
ABDUL GHAFFAR1, MASAAKI TABATA2, FARHANA MAZHER3 and AZHAR MASHIATULLAH1
1 IAD, Pakistan Institute of Nuclear Science & Technology,
P.O. Nilore Islamabad (Pakistan)
ghaffargreat@yahoo.com
2 Faculty of Science and Engineering,
Saga University (Japan),
3 Lahore Women Collage University,
Lahore (Pakistan)
Keywords: activated carbon, catalysis, water/organic solvent mixture, temperature
Pages: 457–461
Abstract
Activated carbon was for the first time used as catalytic substrate in dechlorination process and a significant dechlorination (79 %) of most persistent 2,4,5–trichlorobiphenyl was achieved at 110 ºC in water/isopropanol solvent by applying reducing media. It was observed that carbon particles played a catalytic role to enhance the dechlorination process through substitution reactions and by suppressing further chlorination in reaction mixture. Dechlorination at the ortho position of biphenyl was clearly preceded through substitution reaction by hydroxyl and thiol ions. Moreover, in the absence of activated carbon, dechlorination was decreased and substituted products did not observed.
UDC 547
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