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Dechlorination of short chain chlorinated paraffins by nanoscale zero-valent iron

Author:
Zhang, Zhi-Yong, Lu, Mang, Zhang, Zhong-Zhi, Xiao, Meng, Zhang, Min
Source:
Journal of hazardous materials 2012 v.243 pp. 105-111
ISSN:
0304-3894
Subject:
alkanes, carbon, chlorination, dechlorination, humic acids, iron, models, pH, temperature
Abstract:
In this study, nanoscale zero-valent iron (NZVI) particles were synthesized and used for the reductive dehalogenation of short chain chlorinated paraffins (SCCPs) in the laboratory. The results show that the dechlorination rate of chlorinated n-decane (CP₁₀) by NZVI increased with decreased solution pH. Increasing the loading of NZVI enhanced the dechlorination rate of CP₁₀. With an increase in temperature, the degradation rate increased. The reduction of CP₁₀ by NZVI was accelerated with increasing the concentration of humic acid up to 15mg/L but then was inhibited. The dechlorination of CP₁₀ within the initial 18h followed pseudo-first order rate model. The formation of intermediate products indicates a stepwise dechlorination pathway of SCCPs by NZVI. The carbon chain length and chlorination degree of SCCPs have a polynominal impact on dechlorination reactions.
Agid:
1015129