Soluble Colloidal Manganese Dioxide: Formation, Characterization and Application in Oxidative Kinetic Study of Ciprofloxacin

Tazwar, Gajala; Devra, Vijay

doi:10.9767/bcrec.15.1.5436.74-83

Cited by 5 publications

(2 citation statements)

References 46 publications

(42 reference statements)

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“…The UV-Vis spectrum used to describe the colloidal solution revealed a broad band covering the whole visible region of the spectrum with uniformly decreasing wavelength absorption as well as a single broad band of high intensity at 390 nm. It is corroborated by the findings [18][19][20] that the stabilized spectrum belongs to water-soluble colloidal MnO 2 . By observing the absorbance of several solutions of colloidal MnO 2, it was revealed that the wavelength of 390 nm was appropriate for verifying the Beer-Lambert law's fulfillment.…”

Section: Characterization Of Colloidal Mnosupporting

confidence: 69%

Untitled

2022

AJP

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Introduction:In the geochemistry of the ocean, MnO 2 is a significant phase. It has a significant role in the formation of hydrous iron oxide and manganese nodules. Materials and Methods: The UV-Vis spectrum at 390 nm was used to characterize water soluble colloidal MnO 2 . Non-ionic surfactant such as Tween 80 used for this investigation. Results and Discussion: The kinetics of the oxidation of citric acid by water soluble colloidal MnO 2 in the presence of Tween-80 surfactant have been reported for the 1 st time. There is no effect of ionic surfactants CTAB and SDS. The reaction proceeds through the adsorption of lactic acid on the surface of the colloidal particles. Conclusion: The non-ionic surfactant Tween-80 showed a catalytic effect up to certain concentrations thereafter an inhibitory effect follows. Non-ionic surfactant Tween-80 by bringing the reactants close and closer due to multiple hydrogen bonding. In doing so rate increased.

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Section: Characterization Of Colloidal Mnosupporting

confidence: 69%

Untitled

2022

AJP

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“…Permanganates are oxyanions known to be corrosion inhibitors with low toxicity and strong oxidants power [9][10][11][12][13]. It is used in acidic medium to decontamination of radionuclide in heat exchanger of nuclear power plant and it can inhibits pitting corrosion through the deposition of manganese oxide MnO2 [14].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Corrosion Inhibition of 316L Stainless Steel by Permanganate Ions in Chloride Solution

Arboui¹,

Amzert²,

Boucherit³

et al. 2021

Bull. Chem. React. Eng. Catal.

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The efficiency of permanganates to inhibit the scale deposit captured the attention for more investigation on their role as corrosion inhibitor. In this article, the effect of permanganate as corrosion inhibitor on 316L stainless steel in NaCl solution is investigated. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) have been performed by varying the electrode stirring speed, the concentration of permanganate ions, pH and the temperature. The results show that the permanganate ions increase the cathodic and anodic currents under effect of stirring speed, due to oxygen reduction reaction and the reduction of permanganate ions. Electrochemical results indicate that the deposit of manganese oxide (MnO2) inhibits the pitting corrosion. The inhibition efficiency is up to 98 % for 10−4 mol.dm−3 of permanganate. The temperature reduces the effectiveness of permanganates against pitting corrosion, the pitting potential shifts cathodically from +0.395 V vs. Saturated Calomel Electrode (SCE) at 298 K to +0.275 V vs. SCE at 343 K. Surface morphology of the deposit oxide films and electrode are studied by emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared and Differential Scanning Calorimetry. The analysis of the deposit layer by X-ray diffraction revealed the presence of δ-MnO2 form, with a crystallite size of 3.17 nm. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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