Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 490158
Title One-step synthesis of delta-MnO2 nanoparticles using ascorbic acid and their scavenging properties to Pb(II), Zn(II) and methylene blue
Author(s) Wang, M.X.; Pang, P.; Koopal, L.K.; Qiu, G.H.; Wang, Y.; Liu, F.
Source Materials Chemistry and Physics 148 (2014)3. - ISSN 0254-0584 - p. 1149 - 1156.
DOI https://doi.org/10.1016/j.matchemphys.2014.09.037
Department(s) Physical Chemistry and Soft Matter
Wildlife Ecology and Conservation
Publication type Refereed Article in a scientific journal
Publication year 2014
Keyword(s) high-temperature decomposition - manganese oxide - structural evolution - oxidation-state - layered mno2 - birnessite - adsorption - mechanism - nanobelts - dissolution
Abstract To obtain delta-MnO2 particles with a large specific surface area, MnO2 was synthesized in an ice-water bath using ascorbic acid (AA) to reduce KMnO4. At pH 3 and 5 and KMnO4/AA molar ratios of 8/1 and 10/1, nanoparticles of delta-MnO2 were produced. The specific surface areas (SSAs) of the samples ranged from 163 to 207 m(2)/g. The Mn average oxidation state of the samples ranged from 3.88 to 3.98 and increased with the KMnO4/AA ratio and pH. The adsorption of the samples with respect to metal ion revealed pseudo adsorption capacities of 3425 mmol Pb2+/kg and 1789 mmol Zn2+/kg. The decolorization behaviors of sample S10-5 (produced at pH 5 and KMnO4/AA molar ratios of 10/1) to methylene blue (MB) were compared at different pH values and temperatures. After 120 min at room temperature, 97% of the MB was adsorbed, and approximately 68% was oxidized. The adsorbed amount and the level of oxidation increased with increasing temperature and decreased with increasing pH. (C) 2014 Elsevier B.V. All rights reserved.
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