title: A comparison of the dechlorination mechanisms and Ni release styles of chloroalkane and chloroalkene removal using nickel/iron nanoparticles.
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.
authors.affiliation: 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.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: 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.
authors.forename: Nan
authors.initials: N
authors.lastname: Jia
authors.affiliation: 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.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Han
authors.affiliation: 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.
authors.forename: Zhaofu
authors.initials: Z
authors.lastname: Qiu
authors.affiliation: 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.
authors.forename: Shuguang
authors.initials: S
authors.lastname: Lv
authors.affiliation: 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.
authors.forename: Kuangfei
authors.initials: K
authors.lastname: Lin
authors.affiliation: 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.
authors.forename: Weichi
authors.initials: W
authors.lastname: Ying
mesh_terms: D054879:Halogenation; D006843:Hydrocarbons, Chlorinated / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D006843:Hydrocarbons, Chlorinated; D014874:Water Pollutants, Chemical; D009532:Nickel; D007501:Iron
keywords: Nanoparticle; chlorinated aliphatic hydrocarbon; dechlorination; iron; nickel