Catalytic reductive dechlorination of p-chlorophenol in water using Ni/Fe nanoscale particles

Graduated characterization method using a multi-well microplate for reducing reactivity of nanoscale zero valent iron materials

“…Phenol was produced as a result of the catalytic reduction of para-positioned halogenated phenols, as described in the following equations (Eq. 5-7) [12]. The clear difference caused by the presence of nickel is the reduction mechanism, which is a formation of reactive hydrogen on the second metal particle surface, followed by dehalogenation and hydrogenation by the reactive hydrogen [12].…”

“…aminoclay [10,11]. Additionally, bimetallic particles with iron as the primary metal and the deposition of a thin layer of noble or transition metals, such as palladium (Pd), copper (Cu), nickel (Ni) or platinum (Pt) on the iron surface has been frequently applied to enhance the reactivity of nZVI, especially for reductive dehalogenation [12][13][14].…”

Nanoscale materials for organohalide degradation via reduction pathways

“…Fe/Ni bimetallic nanoparticles were also found to be effective in the remediation of p -chlorophenol ( p -CP). Zhang et al [140] demonstrated the complete degradation of p -CP within 60 min of exposure to a relatively low concentration (0.4 g/l) of Fe/Ni bimetallic NPs with 5 wt % of Ni loading. The initial concentration of p -CP was reported to undergo complete degradation to inorganic chloride and phenol under ambient temperature and pressure in the presence of Fe/Ni bimetallic nanoparticles.…”

Catalytic dechlorination of2,4-dichlorophenol by Ni/Fe nanoparticles in the presence of humic acid: intermediate products and some experimental parameters

“…The final HA solution was then filtered through a 0.45 mm filter membrane, and HA solutions were stored at 4 C before use. Earlier, both Fe 0 and Ni/Fe nanoparticles were synthesised, and the synthesis of Fe 0 and Ni/ Fe nanoparticles was performed as described by Zhang et al [9]. First, the iron nanoparticles were synthesised by drop-wise addition of stoichiometric amounts of NaBH 4 aqueous solution into a flask containing FeSO 4 Á 7H 2 O aqueous solution simultaneously with electrical stirring at 25 C. The ferrous iron was reduced to Fe 0 according to the following reaction:…”

“…This is also consistent with Noubactep's [11,12] report about 'the adsorption/co-precipitation concept' for contaminant removal in Fe 0 /H 2 O systems. The current model for the dechlorination reaction using Ni/Fe nanoparticles involved the oxidation of iron to galvanically protected Ni [9,16]. As iron corroded, protons from solution were reduced to atomic and molecular hydrogen at the catalytic Ni surface.…”