Thermal desorption of polychlorobiphenyls from contaminated soils and their hydrodechlorination using Pd- and Rh-supported catalysts |
| |
Authors: | Aresta M Dibenedetto A Fragale C Giannoccaro P Pastore C Zammiello D Ferragina C |
| |
Institution: | CIRCC, METEA Research Center, Department of Chemistry, University of Bari, Via Celso Ulpiani 27, 70126 Bari, Italy. |
| |
Abstract: | 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. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|