Bimetallic iron-copper oxide nanoparticles supported on nanometric diamond as efficient and stable sunlight-assisted Fenton photocatalyst

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

“…They reported that 85% of sulfamerazine and 60% of total organic content can be removed from water over the course of 60 min at pH 5.8 with constant O2 flow. Nanodiamond was also reported by Navalón et al [106] who functionalized nanodiamond and other carbon containing supports through the use of Fenton reagent followed by chemical deposition of bimetallic nanoparticles through chemical reduction. It was observed that these composites can catalyze the Fenton reaction for the removal of phenol from water.…”

Diamond Nanoparticles in Heterogeneous Catalysis

“…Very recently, bimetallic Fe–Cu alloys with optimal Fe 20 Cu 80 atomic proportion in the form of oxide NPs (0.2 wt %) supported on D-OH have shown superior activity with respect to their monometallic counterparts for the (photo)­Fenton reaction under visible light irradiation . The excellent activity of the Fe 20 Cu 80 /D-OH was attributed to the presence of highly active reduced Cu +/0 species for H 2 O 2 decomposition to HO • while Fe 2+ species allowed the regeneration of these reduced Cu +/0 species.…”

“…Full characterization of these samples by spectroscopic techniques including FT-IR (Figure b), 13 C NMR, and X-ray photoelectron (XP) spectroscopies as well as elemental analysis, zeta potential measurements, and temperature-programmed desorption coupled to mass spectrometry (TDP-MS; Figure c) support these claims . The resulting D-OH material has been employed in several studies to support small noble MNPs such as Au , and Ag or transition metal oxide NPs such as Cu ox , Fe ox , or bimetallic Fe x Cu y NPs . All these D supported metal and metal oxide NPs exhibit superior catalytic activity for different reactions including the (photo-)­Fenton reaction, ,− aerobic oxidations of thiols to disulfides, or aerobic reduction of olefins to hydrocarbons by hydrazine .…”

“…Importantly, the observed catalytic activities of MNPs such as Ag, Cu ox , Fe ox or Fe 20 Cu 80 supported on surface hydroxylated D NPs resulted in being systematically higher than those of analogous catalysts based on AC, graphite, MWCNTs, and even the benchmark solid TiO 2 P-25. − , In the case of the carbonaceous materials, a Fenton treatment followed by a H 2 annealing at high temperature analogous to the preparation of D-OH also resulted in being beneficial to obtain small MNPs with respect to the direct use of the commercial supports. However, the resulting MNP size distribution in these cases always resulted in being larger with respect to the analogous functionalized D NPs.…”

“…33 The resulting D-OH material has been employed in several studies to support small noble MNPs such as Au 33,47 and Ag 44 or transition metal oxide NPs such as Cu ox , 45 Fe ox , 43 or bimetallic Fe x Cu y NPs. 55 All these D supported metal and metal oxide NPs exhibit superior catalytic activity for different reactions including the (photo-)Fenton reaction, 33,43−47 aerobic oxidations of thiols to disulfides, 56 or aerobic reduction of olefins to hydrocarbons by hydrazine. 57 Importantly, in most of the cases it has been found that the activity of these MNPs supported on surface hydroxylated D-OH is higher than that of other carbon supports such as AC or graphite and even higher than benchmark (photo)catalysts, particularly those supported on TiO 2 .…”