Electro-Fenton-like reactions of transition metal ions with electrogenerated hydrogen peroxide

Abstract

ARTICLES YOU MAY BE INTERESTED INAbstract. We evaluated and compared the hydroxyl radical-generating ability of chromium, iron, cobalt, nickel, copper, lanthanum, and cerium ions when reacted with electrogenerated hydrogen peroxide by usage the voltammetry. There was reproduced an electro-Fenton-like reaction in electrochemical cell when metal salt added. The nature of metal ions determined the appearance and increasing of current of hydroxyl radicals cathodic reduction due to individual rate of the redox cycling of metal ions with ongoing cathodic regeneration of Fenton-active metal ions oxidation state. The approximated current magnitude growth in relation to metal ions concentration was calculated for each tested metal. It expressed in μA·ml·μmol −1 and is equal to HO • -generating ability of metal ions. Results are usable for improvement of advanced oxidation processes (AOPs) through enhancement of exploitation of electro-Fenton-like processes with selecting metals that are more active. Besides, in accordance with concept of metal-induced hydroxyl radical stress in biological systems, the hydroxyl radical-generating ability of metal ions is equal to their pro-oxidant capacity.

Targeted T1 Magnetic Resonance Imaging Contrast Enhancement with Extraordinarily Small CoFe2O4 Nanoparticles

“…56 The increase in ROS production for DMSA-ESCIoNs may be due to the higher catalytic ability of Co 2+ ions over Fe 2+ . 56 It may also be linked to the production of different ROS species; iron is known to produce ·OH radicals, whereas cobalt produces ·HO 2 radicals. 57 Other studies have reported ROS production by Fe 3 O 4 and CoFe 2 O 4 nanoparticles.…”

Molecular Alterations in Spermatozoa of a Family Case Living in the Land of Fires—A First Look at Possible Transgenerational Effects of Pollutants

“…In addition, our studies also indicated that in organisms exposed to environments polluted by heavy metals, we found accumulation of some of these metals in gonadal tissues, semen and SNBP [ 37 , 38 , 39 ]. As a matter of fact, in the semen of the father and son, we found different excesses of copper and chromium, two heavy metals involved in the Fenton reaction [ 40 ]. As shown in Figure 4 , chromium was about 17 and 10, while copper was about two and six times higher than the control in the father and son, respectively.…”

Degradation of pesticide Cartap in Padan 95SP by combined advanced oxidation and electro-Fenton process

“…Electrochemical regeneration of Fe 2+ ions by electroreduction of Fe 3+ proceeds in the so-called electro-Fenton process developed in order to get higher efficiency than with the plain Fenton process [11,[16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Instead of Fe 2+ ions, further transition metal ions have been examined [33] Cr(III) was found to be most effective and La(II) least effective. The sequence of activities was established as Cr(III) > Ce(III) > Cu(II) > Co(II) > Fe(II) Ni(II) > La(II).…”