Hydrothermal oxidation of Co-EDTA complexes

Авраменко, В. А.; Voit, A. V.; Dmitrieva, E. E.; Dobrzhanskii, V. G.; Maiorov, V. S.; Сергиенко, В. И.; Shmatko, Sergey

doi:10.1134/s0012500808010072

Cited by 7 publications

(3 citation statements)

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“…S4 of the Supplementary data. The relatively low apparent activation energy calculated from these data (E a = 19 ± 2 kJ•mol −1 ) suggests that the thermal effect is governed by reagent diffusion rather than by the splitting of EDTA chemical bonds, since the influence of the temperature on the intrinsic chemical reaction rate is expected to be much stronger [8]. Indeed, this conclusion is in line with the proposed radical-induced mechanism of EDTA sonocatalytic oxidation.…”

Section: Edta Sonocatalytic Oxidationsupporting

confidence: 67%

“…According to literature, the enhanced catalytic activity of small Co 3 O 4 nanoparticles is related to their higher surface density of Co(III) moieties [30,31]. It is noteworthy that Co(III) is known to form very strong complexes with EDTA [8], which subsequently leads to more efficient sonocatalytic oxidation.…”

Section: Edta Sonocatalytic Oxidationmentioning

confidence: 99%

“…Advanced Oxidation Processes (AOP), based on the generation of highly reactive radical species, can potentially enable the effective oxidation of chelating agents in waste solutions [4]. Indeed, different AOPs have been lately considered for EDTA oxidation, such as catalytic Fenton-like processes [5,6], ozonolysis [7], hydrothermal oxidation [8], photolysis [9] and photocatalysis [10]. All of these techniques have some limitations, for instance, large amount of catalyst and H 2 O 2 are required for Fenton processes.…”

Section: Introductionmentioning

confidence: 99%

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Sonocatalytic oxidation of EDTA in aqueous solutions over noble metal-free Co3O4/TiO2 catalyst

Parizot

Chave

Gálvez

et al. 2019

Applied Catalysis B: Environmental

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The sonocatalytic degradation of EDTA in aqueous solution was studied under ultrasound irradiation (345 kHz, 73 W, acoustic power 0.20 W•mL −1 , Ar and Ar/O 2 saturating gases, T = 20-50°C) in the presence of Co 3 O 4 /TiO 2 and Pt/TiO 2 nanocatalysts. About 90% of EDTA (C 0 = 5 10-3 M) was oxidized during ultrasonic treatment at 40°C in the presence of the Co 3 O 4 /TiO 2 catalyst and Ar/O 2 gas mixture. By contrast, Pt/TiO 2 catalyst exhibited much lower sonocatalytic activity in this system. Suggested mechanism of EDTA oxidation in the presence of Co 3 O 4 /TiO 2 catalyst involved the generation of oxidizing radicals by acoustic cavitation and Co(II)-Co(III) redox process. Quite low apparent activation energy of the sonocatalytic process (E a = 19 kJ mol −1) was attributed to diffusion of reagents in the vicinity of the active sites of catalyst. Sonocatalytic degradation of EDTA is accompanied by formation of iminodiacetic acid, formic acid, oxalic acid, glycolic acid and acetic acid as intermediate products in an agreement with radical-driven mechanism.

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Section: Edta Sonocatalytic Oxidationsupporting

confidence: 67%