Hollow cobalt phosphonate spherical hybrid as high-efficiency Fenton catalyst

Abstract

Organic-inorganic hybrid of cobalt phosphonate hollow nanostructured spheres were prepared in a water-ethanol system through a mild hydrothermal process in the absence of any templates using diethylenetriamine penta(methylene phosphonic acid) as bridging molecule. SEM, TEM and N2 sorption characterization confirmed a hollow spherical micromorphology with well-defined porosity. The structure and chemical states of the hybrid materials were investigated by FT-IR, XPS and thermogravimetric analysis, revealing the homogeneous integrity of inorganic and organic units inside the network. As a heterogeneous catalyst, hollow cobalt phosphonate material exhibited considerable catalytic oxidizing decomposition of methylene blue with sulfate radicals as compared to cobalt phosphonate nanoparticles synthesized in single water system, which could be attributed to enhanced mass transfer and high surface area for the hollow material. Some operational parameters, including pH and reaction temperature, were found to influence the oxidation process. The present results suggest that cobalt phosphonate material can perform as an efficient heterogeneous catalyst for the degradation of organic contaminants, providing insights into the rational design and development of alternative catalysts for wastewater treatment.

Cobalt Phosphonates as Precatalysts for Water Oxidation: Role of Pore Size in Catalysis

“…Figure shows the FTIR spectra of CoOP‐0, 5, 10, and 15 powders after consecutive washing and heating at reflux. The samples exhibited maximum intense FTIR bands at 1080 cm −1 representing the formation of Co−O−P . The peaks around 745, 985, 1322, and 1436 cm −1 have been assigned to P−O−P, P−O, C−N, and P−C/C−H bonds, respectively, relating to phosphonate ligands according to literature precedents .…”

“…The peaks around 745, 985, 1322, and 1436 cm −1 have been assigned to P−O−P, P−O, C−N, and P−C/C−H bonds, respectively, relating to phosphonate ligands according to literature precedents . The bands for −OH stretching of adsorbed water molecules and Co−O groups were also found around 1630, 3410, and 500 cm −1 . FTIR analyses of the as‐synthesized CoOP samples (Figure S2 in the Supporting Information) were carried out to understand the interaction of surfactant with CoOP.…”

Powder activated carbon/Fe3O4 hybrid composite as a highly efficient heterogeneous catalyst for Fenton oxidation of tetracycline: degradation mechanism and kinetic

“…It should be noted that some of these processes have their own drawbacks, including high cost, inefficient removal, toxic byproducts, and excessive sludge production. AOPs involve the generation of highly active oxidizing species which attack and decompose organic components; in other words, the ability to generate such highly oxidizing species makes these processes more efficient, in comparison with other physically-based techniques (e. g. adsorption and flocculation ) 12 . AOPs involve the generation of highly active oxidizing species which attack and decompose organic components; in other words, the ability to generate such highly oxidizing species makes these processes more efficient, in comparison with other physically-based techniques (e. g. adsorption and flocculation ) 12 .…”

Multiwalled carbon nanotube-supported CuCo2S4 as a heterogeneous Fenton-like catalyst with enhanced performance

“…17,18 Moreover, copper and cobalt catalysts have been studied separately, but the combined effect of copper and cobalt in the Fenton reaction has not been studied. 19,20 Thus, we drew our attention on their bimetal suldes. CuCo 2 S 4 has been demonstrated to be effective in providing multiple redox states, which is benecial for reaction activity.…”