redox interaction
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2021 ◽  
Author(s):  
Esam A Gomaa ◽  
H A Killa ◽  
H Fathi ◽  
A Farouk

Abstract Preparation of nano tantalum pentoxide and nano cobalt sulfate were prepared by ball milling using Retsch MM2000 apparatus with three stainless steel balls having diameter 12 mm.Preparation of new working electrode was done by adding nano tantalum petoxide to multicarbonnatubes and carbon with specific ratioand finish nano paste put at the tip of glassy carbon electrode and used for use.The redox reaction of nano cobalt sulfate were studied in 0.1M KBr alone at two temperatures 292.15K and 297.15 using cyclic voltammetry.Different solvation and kinetic parameters were calculated at the used two temperatures and their data were discussed.Interaction parameters of the nano cobalt sulfate with Fucgsin acid dye was done to study the complexationcharcheterbeteen the two cyclic voltammetrically and the resulted data are discussed.Different thermodynamic data were evaluated for the interaction of nanocobal sulfate NCS with Fuchsin Acid, FA like stability constants, Gibbs free energies of complexation, enthalpies and entropies were evaluated and their values were discussed


Antioxidants ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1937
Author(s):  
Jan Olof G. Karlsson ◽  
Per Jynge ◽  
Louis J. Ignarro

On 2 July 2021, highly negative results were reported from the POLAR A and M phase III trials in patients with colorectal cancer, treated with an oxaliplatin-based regimen and co-treated with calmangafodipir (CaM; PledOx®; PledPharma AB/Egetis Therapeutics AB) or placebo. The results revealed persistent chemotherapy-induced peripheral neuropathy (CIPN) in 54.8% of the patients treated with PledOx, compared with 40.0% of the patients treated with the placebo (p < 0.05), i.e., a 37% increase in incidence of the side effect that the trial was aimed to prevent. The damaging outcome of the trials differed diametrically from an in-parallel conducted mice study and from a clinical trial with mangafodipir, the active ingredient of CaM. According to the authors of the POLAR report, the etiology of the profound increase in CIPN in the PledOx arm is unclear. However, these devastating effects are presumably explained by intravenous administrations of PledOx and oxaliplatin being too close in time and, thereby, causing unfavorable redox interactions between Mn2+ and Pt2−. In the mice study as well as in the preceding phase II clinical trial (PLIANT), PledOx was administered 10 min before the start of the oxaliplatin infusion; this was clearly an administration procedure, where the devastating interactions between PledOx and oxaliplatin could be avoided. However, when it comes to the POLAR trials, PledOx was administered, for incomprehensible reasons, “on Top of Modified FOLFOX6” at day one, i.e., after the two-hour oxaliplatin infusion instead of before oxaliplatin. This is a time point when the plasma concentration of oxaliplatin and Pt2+-metabolites is at its highest, and where the risk of devastating redox interactions between PledOx and oxaliplatin, in turn, is at its highest.


Minerals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1267
Author(s):  
Yuliya V. Bataleva ◽  
Ivan D. Novoselov ◽  
Yuri M. Borzdov ◽  
Olga V. Furman ◽  
Yuri N. Palyanov

Experimental modeling of ankerite–pyrite interaction was carried out on a multi-anvil high-pressure apparatus of a “split sphere” type (6.3 GPa, 1050–1550 °C, 20–60 h). At T ≤ 1250 °C, the formation of pyrrhotite, dolomite, magnesite, and metastable graphite was established. At higher temperatures, the generation of two immiscible melts (carbonate and sulfide ones), as well as graphite crystallization and diamond growth on seeds, occurred. It was established that the decrease in iron concentration in ankerite occurs by extraction of iron by sulfide and leads to the formation of pyrrhotite or sulfide melt, with corresponding ankerite breakdown into dolomite and magnesite. Further redox interaction of Ca,Mg,Fe carbonates with pyrrhotite (or between carbonate and sulfide melts) results in the carbonate reduction to C0 and metastable graphite formation (±diamond growth on seeds). It was established that the ankerite–pyrite interaction, which can occur in a downgoing slab, involves ankerite sulfidation that triggers further graphite-forming redox reactions and can be one of the scenarios of the elemental carbon formation under subduction settings.


2021 ◽  
Author(s):  
Fenglei Liu ◽  
Shan Hua ◽  
Qingyuan Hu ◽  
Chao Wang ◽  
baowei hu

Abstract A bio-adsorbent (DAWP-PEI-β-CD) was facilely prepared by introducing polyethylenimine (PEI) and β-cyclodextrin (β-CD) into dialdehyde waste paper (DAWP) via a facile two-step method. Various physicochemical and spectroscopic techniques (FT-IR, XRD, SEM, NMR, XPS) were applied to characterize the structure, morphology and composition of the as-prepared adsorbents. Investigation results showed that the pH values, reaction temperature and contact time played a vital role in uptake of Eu(III) and Au(III). Meanwhile, the adsorption behavior of Eu(III) and Au(III) could be fitted felicitously with the Langmuir and the Pseudo-second-order models, and the saturated adsorption amounts of Eu(III) (pH = 6.0) and Au(III) (pH = 2.0) onto DAWP-PEI-β-CD were 424.2 and 241.3 mg/g, respectively. Further advanced spectroscopy analysis revealed that the elimination of Eu(III) was attributed to host-guest inclusion and surface complexation interaction, while adsorption of Au(III) might stem from a combination of electrostatic attraction, chelation, host-guest inclusion and redox interaction. This study demonstrated that DAWP-PEI-β-CD was a promising environmental functional material to separation and enrichment of Eu(III) and Au(III) from contaminated water.


2021 ◽  
pp. 137701
Author(s):  
N Sethulakshmi ◽  
Subramanian Nellaiappan ◽  
Phanikumar Pentyala ◽  
Manu Sharma ◽  
Silvia Irusta ◽  
...  

2020 ◽  
Vol 49 (3) ◽  
pp. 736-764 ◽  
Author(s):  
Xiao Wang ◽  
Shuyan Song ◽  
Hongjie Zhang

The review article focuses on the redox interaction-engaged strategy that offers a powerful way to construct multicomponent nanomaterials with precisely-controlled size, shape, composition and hybridization of nanostructures.


Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 425
Author(s):  
Zdrokov ◽  
Novoselov ◽  
Bataleva ◽  
Borzdov ◽  
Palyanov

: Interactions of mantle silicates with subducted carbonates, sulfides, and sulfur-rich fluids are experimentally simulated in the olivine-ankerite-sulfur and olivine-ankerite-pyrite systems using a multi-anvil high-pressure split-sphere apparatus at 6.3 GPa and range of 1050–1550 °C. Recrystallization of Fe,Ni-bearing olivine and ankerite in a sulfur melt was found to be accompanied by sulfidation of olivine and carbonate, involving partial extraction of metals, carbon, and oxygen into the melt, followed by the formation of pyrite (±pyrrhotite), diopside, and Fe-free carbonates. The main features of metasomatic alteration of Fe,Ni-olivine by a reduced sulfur fluid include: (i) a zonal structure of crystals (Fe-rich core, Mg-rich rim); (ii) inclusions of pyrite and pyrrhotite in olivine; (iii) certain Raman spectral characteristics of olivine. At T > 1350 °C, two immiscible melts, a predominantly sulfur melt with dissolved components (or a Fe–Ni–S–O melt) and a predominantly carbonate one, are generated. The redox interaction of these melts leads to the formation of metastable graphite (1350–1550 °C) and diamond growth (1550 °C). The studied olivine-ankerite-sulfur and olivine-ankerite-pyrite interactions may be considered as the basis for simulation of metasomatic processes accompanied by the formation of mantle sulfides during subduction of crustal material to the silicate mantle.


2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Tsing Bohu ◽  
Ravi Anand ◽  
Ryan Noble ◽  
Mel Lintern ◽  
Anna H. Kaksonen ◽  
...  

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