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Evaluation of the Mn(II) adsorption potential of SiO 2 obtained by different wet chemical methods
Author(s) -
Gonçalves Patrícia,
Barbosa Adriano Francisco,
Oliveira Jéssica Ariane,
Bertholdo Roberto,
Giraldi Tania Regina
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13234
Subject(s) - adsorption , zeta potential , freundlich equation , materials science , aqueous solution , langmuir , bet theory , chemical engineering , specific surface area , scanning electron microscope , nuclear chemistry , langmuir adsorption model , metal ions in aqueous solution , metal , chemistry , organic chemistry , nanotechnology , composite material , metallurgy , catalysis , nanoparticle , engineering
This paper describes the development of SiO 2 by 2 different wet chemical methods: polymeric precursor (PP) and sol‐gel (SG). These samples were used as adsorbents of Mn(II) metal ions. Physicochemical characteristics of the 2 adsorbents were established, while zeta potential, Scanning Electron Microscopy, and Brunauer‐Emmett‐Teller (BET) surface area methods were further employed for characterization. Efficiencies of the prepared adsorbents in the adsorption of Mn(II) from aqueous solutions were investigated. The BET surface areas of the prepared adsorbent were 171 and 7 m 2 g −1 for SiO 2 PP and SiO 2 SG, respectively. Optimal adsorption occurred at pH 8.5, 5g L −1 of adsorbent concentration, and 90 minutes of contact time for both adsorbents. The Langmuir and Freundlich isotherms models fitted the experimental data of SiO 2 PP and SiO 2 SG, respectively, and SiO 2 PP showed the highest adsorption capacity due, probably, to its greater specific area.