ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The removal of metallic ions from binary aqueous solutions of Fe(III)/Cr(III) andFe(III)/Cr(VI) by an Arthrobacter viscosus biofilm supported on NaY zeolite was investigated.Experiments were repeated with suspended biomass for comparison purposes. Batch assays wereperformed using different concentrations (10, 25 and 40 mg/L), for both metals in solution. Resultsindicated that Arthrobacter viscosus is able to retain the metallic ions, although not totally. Theremoval efficiencies were improved when the biofilm was supported on the zeolite, for all the initialconcentrations of Cr(III), for the intermediate and higher concentration of Cr(VI) and for all rangeof initial concentrations of Fe(III), in the presence of Cr(III). The bacteria reduce Cr(VI) to Cr(III)and, only then, this cation may be entrapped in the framework zeolite by ion exchange. Suspendedbacteria had higher affinity for Fe(III), than for Cr(VI) or Cr(III), while the conjugated system wasselective to Fe(III) when in the presence of Cr(VI). For solutions of Fe(III)/Cr(III), very highremovals were achieved by the supported system, ranging from 94 to 100 % for Cr(III) and from 98to 100 % for Fe(III). The conjugated system also reached the highest removal ratio of Cr(VI), 36 %,for the initial concentration of 40 mg/L. The materials in study were characterized by techniquessuch as FTIR, SEM and chemical analyses
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.463.pdf
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