Synthesis of manganese oxide sols by KMnO4 reduction with polyvinyl alcohol in an aqueous medium

Иванец, А. И.; Prozorovich, Vladimir; Ryabkov, Yu. I.; Krivoshapkin, Pavel V.; Katsoshvili, L. L.

doi:10.1134/s107036321704003x

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“…Bach and co-workers used the reduction of permanganate aqueous solutions AMnO 4 [A = Li, Na, K, NH 4 , N(CH 3 ) 4 ] by fumaric acid to obtain transparent and stable manganese dioxide gels [18]. Stable manganese oxide sols were also synthesized by reduction of KMnO 4 with polyvinyl alcohol in an aqueous medium [25]. Nanostructured MnO 2 was synthesized at ambient conditions by reduction of potassium permanganate with aniline [26].…”

Section: Introductionmentioning

confidence: 99%

Radiolytic synthesis of manganese oxides and their ability to decolorize methylene blue in aqueous solutions

Mikac

Marić

Štefanić

et al. 2019

Applied Surface Science

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In this work, manganese oxide nanoparticles were radiolytically synthesized in the presence or absence of diethylaminoethyl-dextran hydrochloride (DEAE-dextran). Deoxygenated potassium permanganate (KMnO 4 ) alkaline aqueous suspensions were used as a precursor. The dose rate was~32 kGy h −1 and the absorbed doses were 100 and 200 kGy. The XRD patterns showed broad peaks indicating the low crystallinity and/or amorphous character of synthesized manganese oxides samples. The radiolytically synthesized samples in the presence of DEAE-dextran contained a mixture of phases, namely Mn 2 O 3 , Mn 3 O 4 and an amorphous phase. The samples radiolytically synthesized with no added polymer consist of K 0.27 MnO 2 ۰ 0.54 H 2 O and Mn 3 O 4 (hausmannite). The volume average domain size of hausmannite was estimated to~45 nm using Scherrer equation and Williamson-Hall plots. The hydrodynamic diameters and zeta potential of the samples were measured. The pore radius distributions and pore volume of the obtained manganese oxides were determined by N 2 adsorption-desorption measurements. The synthesized manganese oxide samples were applied for decolorization of methylene blue (MB) aqueous solutions at pH = 2. The MB concentrations in the supernatant solutions were determined through the measurements of the UV-Vis absorbance intensities at a wavelength of 663 nm. The radiolytically synthesized Mn 3 O 4 NPs in the absence of DEAE-dextran polymer (zeta potential of −39.4 mV, BET surface area of 234 m 2 g −1 and pore volume of 1.52 cm 3 g −1 ) showed the highest MB decolorization effect.

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Section: Introductionmentioning

confidence: 99%