Highly effective degradation of polychlorinated biphenyls in soil mediated by a Ca/Rh bicatalytic system.
Treatment of PCBs in soil using metallic calcium and alcohol ultimately reduced 1300 x 10(-3)mgkg(-1) PCB concentration to 1.8 x 10(-3)mg kg(-1). Moreover, using the metallic calcium catalyst method to promote the effective use of hydrogen gas in the presence of a specific reducing catalyst such as Rh/C, the decomposition efficiency of PCBs was notably increased despite mild reaction conditions. The total PCB concentration of treated soils decreased from 1300 x 10(-3)mg kg(-1) to 0.62 x 10(-3)mg kg(-1) (decomp. avg.=99.95%). Treatment of soils with metallic calcium and a Rh/C catalyst in alcohol under mild conditions such as 0.15-0.26 MPa at room temperature is extremely effective for degradation of existing PCBs.
Mitoma
Yoshiharu
Y
Department of Environmental Sciences, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka-Cho, Shobara City, Hiroshima 727-0023, Japan. mitomay@pu-hiroshima.ac.jp
Egashira
Naoyoshi
N
Simion
Cristian
C
D002118:Calcium / Q000737:chemistry*; D002384:Catalysis; D052918:Environmental Restoration and Remediation; D008956:Models, Chemical; D011078:Polychlorinated Biphenyls / Q000378:metabolism*; D012238:Rhodium / Q000737:chemistry*; D012989:Soil Pollutants / Q000378:metabolism*
D012989:Soil Pollutants; D011078:Polychlorinated Biphenyls; D012238:Rhodium; D002118:Calcium