Mesoporous silica based catalysts for the oxidation of azodyes in waste water View Full Text


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Article Info

DATE

2016-04

AUTHORS

T. V. Kon’kova, M. G. Gordienko, M. B. Alekhina, N. V. Men’shutina, S. D. Kirik

ABSTRACT

Iron-containing catalysts supported on mesoporous silica samples that differ in the methods of their preparation (commercial KSS silica gel, MSM-41 mesoporous silicalite, and silica gels obtained under laboratory conditions by means of spray drying and drying in supercritical СО2) are synthesized. Their porous structure is studied via low-temperature nitrogen adsorption. Their catalytic activity and stability in the oxidation of carmoisine (an anionic dye) with a 3% hydrogen peroxide solution in water at 60°C and рН 3 are compared. The initial carmoisine and catalyst concentrations in solution are 20 mg/L and 3 g/L, respectively, and the molar Н2О2/carmoisine ratio is 459/1. The KSS-based catalyst demonstrates the highest activity and stability with respect to the outwashing of an active component into a solution: the conversion of carmoisine on this catalyst is as high as 99% for 30 min, while the concentration of iron ions in solution (0.27 mg/L) does not exceed the maximum allowable concentration. After the support is preimpregnated with aluminum, the degree of iron outwashing into a solution is more than halved. The synthesized catalysts are of interest with regard to the purification of waste water containing organic admixtures. More... »

PAGES

128-133

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s2070050416020069

DOI

http://dx.doi.org/10.1134/s2070050416020069

DIMENSIONS

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