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 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 5h or 100% in 12h.
Aresta
M
M
CIRCC, METEA Research Center, Department of Chemistry, University of Bari, Via Celso Ulpiani 27, 70126 Bari, Italy.
Dibenedetto
A
A
Fragale
C
C
Giannoccaro
P
P
Pastore
C
C
Zammiello
D
D
Ferragina
C
C
D000327:Adsorption; D002384:Catalysis; D052918:Environmental Restoration and Remediation / Q000379:methods; D008962:Models, Theoretical; D010165:Palladium / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000737:chemistry*; D012238:Rhodium / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*; D013696:Temperature
D012989:Soil Pollutants; D010165:Palladium; D011078:Polychlorinated Biphenyls; D012238:Rhodium