Dehalogenation of aromatic halides by polyaniline/zero-valent iron composite nanofiber: Kinetics and mechanisms

Preparation of an amino-modified biochar supported sulfide nanoscale zero-valent iron composite and its efficient removal of U(vi) from wastewater by adsorption and reduction

“…These limitations make the sole use of nZVI for treating contaminated wastewater less effective. [13][14][15] The application of biochar (BC) has demonstrated significant potential for water contaminant removal, [16][17][18][19] nZVI supported by biochar were synthesized and widely used for simultaneous removal of heavy metal ions or organic compounds from wastewater, [20][21][22][23][24] such as Cr(VI), Pb(II), Cd(II), Cu(II), Ni(II), p-nitrophenol (PNP), antibiotic florfenicol, and so on. Amino-modified biochar was used as a support material to prevent agglomeration of nZVI, thereby enabling simultaneous achievement of strong adsorption and reduction effects.…”

Catalytic Oxygen Activation over the Defective CuO Nanoparticles for Ultrafast Dehalogenation

“…Zero-valent (bi)­metallics, e.g., Fe, Fe/Pd, and Fe/Ni, are the most well-known catalyst for the reductive dehalogenation reaction via the electron transfer or hydrogen atom transfer pathways. , However, strictly anaerobic conditions are required to avoid the meaningless consumption of the reducible reactive species . Also, such catalysts are synthesized with the highly expensive and toxic metals (e.g., Pd and Ni), and the environmentally noxious reductants (e.g., N 2 H 4 and NaBH 4 ) . Therefore, it is of great significance to develop more cost effective and green technology for the reductive dehalogenation of HOCs.…”

“…15 Also, such catalysts are synthesized with the highly expensive and toxic metals (e.g., Pd and Ni), and the environmentally noxious reductants (e.g., N 2 H 4 and NaBH 4 ). 16 Therefore, it is of great significance to develop more cost effective and green technology for the reductive dehalogenation of HOCs. Molecular oxygen (O 2 ) in air has been widely used as a green and cheap oxidant in diverse chemical reactions.…”

Polyionic Resin Supported Pd/Fe2O3Nanohybrids for Catalytic Hydrodehalogenation: Improved and Versatile Remediation for Toxic Pollutants

“…It is well-known that the HDH of halogenated aromatic compounds occurs in the order of C–I > C–Br > C–Cl ≫ C–F, which is ascribed to the dissociation energy of the C–halogen bonds. , Although different transition metal catalysts such as Pd, Ni, Pt, Au, Rh, Ru, and Fe have been used in the HDH reaction, the success of the reaction is also dependent on the reducing sources. − Even bi- or trimetallic catalysts, either in alloys or in intermetallic forms, often show better performance than monometallic catalysts. − Efforts toward developing bimetallic catalysts for HDH have therefore been made. Supported bimetallic catalysts involving two coinage metals (Ag/Au), and in particular Pd/Fe have been prepared and employed in HDH reaction. − Poly­(vinylidene fluoride)–alumina membrane-supported Pd/Fe nanocatalyst was used in the dechlorination of only monochloroacetic acid, Pd/Fe NPs impregnated with granular activated charcoal, and Pd/Fe bimetallic nanotubes, composed of Fe nanotubes as core coated with shell of Pd NPs, were studied for hydrodechlorination of only polychlorobiphenyls, or Pd/Fe bimetallic catalyst with micron sizes was employed specifically for the HDH of tetrabromo- or tetrachlorobisphenol A. , It is evident that the applicability of these supported catalytic systems has been often found to be limited and presumably stems from the fact that these catalytic systems do not comply with actual shape or facets, spatial distribution, and requisite proximity for interaction between two metals on the surface, among others, which could activate the reducing sources for further reactions.…”