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Abstract: To understand the feasibility of its application to the in situ remediation of contaminated groundwater, the 28dechlorination%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>2f4a8b>dechlorination of 2,4-dichlorophenol (2,4-DCP) by 28ni/Fe nanoparticles%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>2f4a8b>ni/Fe nanoparticles in the presence of humic acid (HA) was investigated. We found that, as high performance liquid chromatography (HPLC) was used, the 2,4-DCP was first quickly reduced to o-chlorophenol (o-CP) and p-chlorophenol (p-CP), and then reduced to phenol as the final product. Our experimental results indicated that HA had an adverse effect on the 28dechlorination%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>2f4a8b>dechlorination of 2,4-DCP by 28ni/Fe nanoparticles%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>2f4a8b>ni/Fe nanoparticles, as the HA concentration increased, the removal rate decreased evidently. It also demonstrated that 2,4-DCP was reduced more easily to o-CP than to p-CP, and that the sequence of the tendency in 28dechlorination%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>2f4a8b>dechlorination of intermediates was p-CP>o-CP. Transmission electron microscope (TEM) showed that HA could act as an adsorbate to compete reactive sites on the surface of 28ni/Fe nanoparticles%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>2f4a8b>ni/Fe nanoparticles to decrease the 28dechlorination%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>2f4a8b>dechlorination rate. Also we concluded that the 28dechlorination%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>2f4a8b>dechlorination reaction of 2,4-DCP over 28ni/Fe nanoparticles%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>2f4a8b>ni/Fe nanoparticles progressed through catalytic reductive 28dechlorination%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>2f4a8b>dechlorination.

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