Complex formation of water-soluble iron(III)-porphyrin with humic acids and their effects on the catalytic oxidation of pentachlorophenol

Metodología para obtener ácidos húmicos y fulvicos y su caracterización mediante espectrofotometría infrarroja

“…It is also noted that the physicochemical properties of humic substances vary according to their origin (Fukushima et al, 2006), they are amorphous multifunctional biopolymers, comprising hundreds of organic compounds including carbohydrates and condensed aromatic rings, which may be substituted by phenol groups, carboxyls, hydroxyls and methyls, and these results are consistent with those obtained by Peuravuori et al (2006) and Evangelou et al (1999). These groups act like chelating agents by complexing and chelating cations in the soil solution, transferring them to the root cell wall, then these nutrients are translocated by the xylem stream to the growing points.…”

“…También se observa que las propiedades fisicoquímicas de las sustancias húmicas varían según su origen (Fukushima et al, 2006), son biopolímeros multifuncionales amorfos, compuestos por cientos de componentes orgánicos que incluyen carbohidratos y anillos aromáticos condensados, que pueden ser sustituidos por grupos fenólicos, carboxilos, oxhidrilos y metilos, donde estos resultados concuerdan con los obtenidos por Peuravuori et al (2006) y Evangelou et al (1999. Éstos grupos tienen la particularidad de agrupar y quelatar cationes en la solución del suelo, llevarlos a la pared celular de la raíz, similar a agentes quelatantes y ser transportados los nutrimentos por el torrente xilemático hacia los puntos de crecimiento.…”

Catalytic oxidation of tetrabromobisphenol A by iron(III)-tetrakis(p-sulfonatephenyl)porphyrin catalyst supported on cyclodextrin polymers with potassium monopersulfate

“…The interiors of the CDs are hydrophobic and form inclusion complexes with a variety of organic molecules [18] as well as with metalloporphyrins [19][20][21][22][23][24]. Hydroxypropyl-␤-CD and 2,3,6-tri-O-methyl-␤-CD (TM-␤-CD) formed the inclusion complexes with FeTPPS, which resulted in a reduction in of catalyst self-degradation, resulting in the enhanced degradation of PCP or TBBPA in homogeneous systems using the FeTPPS catalyst [25][26][27][28].…”

Oxidative Debromination and Degradation of Tetrabromo-bisphenol A by a Functionalized Silica-Supported Iron(III)-tetrakis(p-sulfonatophenyl)porphyrin Catalyst

“…Considerable interest has developed regarding Fe-based biomimetic catalysts, such as iron-porphyrins, because of their ability to mimic cytochrome P450 enzymes that catalyze a variety of oxidation reactions [ 8 , 9 ]. Iron porphyrins can oxidize bromophenols in homogenous solutions [ 10 , 11 ], but these types of catalysts are deactivated due to rapid self-degradation under the highly oxidative conditions and by dimerization via the formation of μ-oxo iron(III) species [ 12 , 13 , 14 ]. The immobilization of such catalysts on a suitable support has been used to increase their stability towards oxidative self-degradation and to prevent catalyst deactivation caused by dimerization [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ].…”