Thermal desorption of polychlorobiphenyls from contaminated soils and their hydrodechlorination using Pd- and Rh-supported catalysts

This paper reports about a combined technology for soil remediation from PCBs using the thermal desorption technique coupled with the catalytic hydrogenation of recovered PCBs. The reactor is a bench scale rotating desorption furnace through which nitrogen is flushed and used as carrier gas of desor...

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Bibliographic Details
Published in:	Chemosphere (Oxford) Vol. 70; no. 6; pp. 1052 - 1058
Main Authors:	Aresta, M., Dibenedetto, A., Fragale, C., Giannoccaro, P., Pastore, C., Zammiello, D., Ferragina, C.
Format:	Journal Article
Language:	English
Published:	Oxford Elsevier Ltd 2008 Elsevier
Subjects:	Adsorption Applied sciences Catalysis catalysts chemical reactions Contaminated soils dechlorination Decontamination. Miscellaneous desorption Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Environmental Restoration and Remediation - methods Exact sciences and technology heat treatment Hydrodechlorination Models, Theoretical palladium Palladium - chemistry Pd- and Rh-supported catalysts Pollution Pollution, environment geology polychlorinated biphenyls Polychlorinated Biphenyls - chemistry Polychlorobiphenyls remediation rhodium Rhodium - chemistry Soil and sediments pollution soil heating Soil Pollutants - chemistry soil pollution Temperature Polychlorobiphenyls Contaminated soils Pd- and Rh-supported catalysts Hydrodechlorination Catalytic reaction Thermodesorption Palladium Soil pollution Organic chlorine compounds Hydrogenation Zirconium Phosphates Supported catalyst Persistent organic pollutant Dechlorination Decontamination Rhodium Chlorocarbon Aromatic compound Organic compounds
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Summary:	This paper reports about a combined technology for soil remediation from PCBs using the thermal desorption technique coupled with the catalytic hydrogenation of recovered PCBs. The reactor is a bench scale rotating desorption furnace through which nitrogen is flushed and used as carrier gas of desorbed PCBs. The latter are condensed into an hexane or hexane–acetone (1:1 v/v) solution that is then hydrogenated using phosphate-supported Pd or Rh as catalyst. The analysis of the treated soil, under variable operative conditions (temperature and desorption time), shows that the total (99.8%) decontamination from PCBs occurs. The recovery yield of the desorbed PCBs is better than 75% and the subsequent hydrogenation reaches 63% of the collected PCBs in 5 h or 100% in 12 h.
Bibliography:	http://dx.doi.org/10.1016/j.chemosphere.2007.07.074 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0045-6535 1879-1298
DOI:	10.1016/j.chemosphere.2007.07.074