Copper nanoparticles supported on diamond nanoparticles as a cost-effective and efficient catalyst for natural sunlight assisted Fenton reaction

Abstract

A series of catalysts consisting in Cu nanoparticles (NPs) supported on diamond nanoparticles (D) was obtained by polyol reduction of Cu(NO3)2 in the presence of D. The best performing Cu/D catalyst was obtained using a D sample in which the commercial D was submitted to Fenton treatment to decompose amorphous soot matter impure fying commercial D and subsequent hydrogen treatment at 500 ºC to reduce oxygenated functional groups generated in the oxidative treatment at the D surface. Cu/D performs better than analogous catalyst based on Cu NPs supported on activated carbon, carbon nanotubes and TiO2-P25. Comparison of the catalytic activity of Cu/D with that of analogous Au/D and Ag/D shows that although the catalytic activity of fresh Cu/D is somewhat lower, but comparable to the other two noble metal catalysts, the key issue is the lower Cu/D stability. The catalytic activity of Cu/D decreases upon reuse, but can be recovered in a large extent by reducing again the catalyst using the polyol method before reuse. By Cu/D regeneration in each use, an accumulated turnover number of 52,600 was achieved.

Active sites on graphene-based materials as metal-free catalysts

“…Besides acids and bases, homogeneous and heterogeneous catalysis is currently dominated by the use of transition metals, either as free ions, coordination metal complexes, clusters or nanoparticles, acting as active sites. [1][2][3][4][5][6][7][8][9][10][11][12][13] Some of these transition metals are rare, there being issues of sustainability coming with such choices. There is a large incentive in finding alternative metalfree catalysts, based on abundant elements.…”

Iron oxide nanoparticles supported on diamond nanoparticles as efficient and stable catalyst for the visible light assisted Fenton reaction

“…In the field of metal NPs, Garcia and co-workers have reported that metal NPs exhibiting plasmonic absorption bands in the visible region such as Au [8], Ag [15] and Cu [16] supported on surface modified diamond (D) NPs are among the most effective -4 -catalysts to promote the heterogeneous (photo)Fenton reaction under visible and solar light irradiation even at quasi-neutral pH values. It is important to note that analogous (photo)catalysts using other carbonaceous supports such as graphite, activated carbon (AC) or multiwall-carbon nanotubes (MWCNTs) resulted in lower activity and/or efficiency for this process.…”

Graphene encapsulated FexCoy nanocages derived from metal–organic frameworks as efficient activators for peroxymonosulfate

“…However, the narrow working pH range and low H 2 O 2 utilization rate remarkably limit the practical application of˙OH-based Fenton systems. [3][4][5][6][7] Compared to the˙OH-based Fenton system, the sulfate radical (SO 4˙− ) based Fenton-like system by activation of peroxymonosulfate (PMS) was reported as one of the promising alternatives due to its high efficiency at a wide pH range and low catalyst dosage. [8][9][10] Among various transition metal catalysts, Co was found to be very active for PMS activation to produce SO 4˙− .…”