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Environ Technol. 2016 Aug;37(16):2088-98. doi: 10.1080/09593330.2016.1141998. Epub 2016 Feb 19.

A comparison of the dechlorination mechanisms and Ni release styles of chloroalkane and chloroalkene removal using nickel/iron nanoparticles.

Author information

1
a State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process , School of Resources and Environmental Engineering, East China University of Science and Technology , Shanghai , People's Republic of China.

Abstract

In this study, we compared the removal kinetics and Ni release styles of 1,1,1-trichloroethane (1,1,1-TCA), trichloroethylene (TCE), and tetrachloroethene (PCE) that result from the use of Ni/Fe nanoparticles in water. Compared to TCE and PCE, 1,1,1-TCA was more readily removed, and the concentration profiles of the three chlorinated aliphatic hydrocarbons (CAHs) during the reduction processes fit pseudo-first-order reaction rate models well. The surface area-normalized rate constants show that the 11% Ni Ni/Fe nanoparticles, which has the largest Brunauer-Emmett-Teller surface area, has the highest capacity for 1,1,1-TCA removal per unit surface area and that the 6% Ni sample was the best for removing TCE and PCE. The observed by-products suggested that hydrogenolysis was responsible for the dechlorination of CAHs in the presence of Ni/Fe nanoparticles. More Ni2+ was released during the degradation of 1,1,1-TCA than that of TCE and PCE because Ni will reduce the CAHs directly as a zerovalent metal does when hydrogen atoms in the Ni lattice are not sufficient due to the rapid incomplete dechlorination of 1,1,1-TCA. The different modes of adsorption of chloroalkane and chloroalkene onto the surfaces of Ni/Fe particles might play an important role in their dechlorination process.

KEYWORDS:

Nanoparticle; chlorinated aliphatic hydrocarbon; dechlorination; iron; nickel

PMID:
26776083
DOI:
10.1080/09593330.2016.1141998
[Indexed for MEDLINE]

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