Reductive dechlorination of polychlorinated biphenyls (PCBs) by means of Nanoscale Zero Valent Iron (NZVNI) particles

Negroni, A., Zanaroli, G., Vignola, M. , Fava, F. and Shu, H.-Y. (2012) Reductive dechlorination of polychlorinated biphenyls (PCBs) by means of Nanoscale Zero Valent Iron (NZVNI) particles. Environmental Engineering and Management Journal, 11(10), pp. 1733-1739.

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Polychlorinated biphenyls (PCBs) are toxic and recalcitrant compounds that can be reductively dechlorinated in the presence of expensive catalyzers, such as bimetallic Fe/Pd nanosized particles. Other Pd-free zerovalent metallic and bimetallic systems, such as Nanoscale Zero Valent Iron (NZVI) and Nanoscale Zero Valent Nickel-Iron (NZVNI) particles, are cheaper and able to promote the dechlorination of aliphatics and aromatics. In this paper, we investigated the dechlorination capability of NZVI (1.67g Fe0/L) and NZVNI (1.67g Fe0/L and 0.88g Ni0/L) particles towards 2,3,4,5-CB (2 mg/L) in water and methanol/water 30% (v/v) solution at room temperature. NZVI proved ineffective in 2,3,4,5-CB dechlorination under both the above-mentioned conditions. On the contrary, NZVNI dechlorinated 7.1±1.8 % and 27.7±0.4 % of the 2,3,4,5-CB occurring in water and in methanol/water solution, respectively, in 8 weeks of incubation. Dechlorination occurred via preferential removal of the less sterically hindered chlorine in meta position 5 and proceeded by removing chlorines in para position and in meta position 3.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Vignola, Dr Marta
Authors: Negroni, A., Zanaroli, G., Vignola, M., Fava, F., and Shu, H.-Y.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Environmental Engineering and Management Journal
Publisher:Universitatea Tehnica "Gheorghe Asachi" Iasi

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