Hexavalent Chromium Removal From Aqueous Solutions by Fe-Modified Peanut Husk

Cr(VI) adsorption from aqueous solutions on peanut husk modified with formaldehyde (PeH-F) and peanut husk modified with formaldehyde and Fe (PeH-FFe) was evaluated as a function of shaking time, initial pH, chromium concentration, and temperature. Results showed that the Cr(VI) is preferentially ad...

Full description

Saved in:

Bibliographic Details
Published in:	Water, air, and soil pollution air, and soil pollution, 2013-09, Vol.224 (9), p.1-9, Article 1654
Main Authors:	OLGUIN, M. T, LOPEZ-GONZALEZ, H, SERRANO-GOMEZ, J
Format:	Article
Language:	eng
Subjects:	Adsorbents Adsorption Agronomy. Soil science and plant productions Aqueous solutions Arachis hypogaea Atmospheric Protection/Air Quality Control/Air Pollution Biological and medical sciences Biomass Carbon Chromium Climate Change/Climate Change Impacts Earth and Environmental Science Environment Environmental studies Experiments Formaldehyde Fundamental and applied biological sciences. Psychology General agronomy. Plant production Heavy metals Hydrogeology Mass spectrometry Metals Particle size Scanning electron microscopy Soil Science & Conservation Spectrum analysis Studies Use of agricultural and forest wastes. Biomass use, bioconversion Water Quality/Water Pollution
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	Cr(VI) adsorption from aqueous solutions on peanut husk modified with formaldehyde (PeH-F) and peanut husk modified with formaldehyde and Fe (PeH-FFe) was evaluated as a function of shaking time, initial pH, chromium concentration, and temperature. Results showed that the Cr(VI) is preferentially adsorbed by PeH-FFe at pH 2 than pH 6. It also was found that the chromate equilibrium sorption capacity for PeH-FFe is at least six times higher than for PeH-F. The optimum pH to remove chromium is 2 for both materials; however, PeH-FFe has a higher efficiency for the chromium removal. Finally, Cr(VI) adsorption also depends on chromium concentration and temperature. The adsorption data as a function of concentration obey Linear, Freundlich, and Langmuir isotherms at pH 2 and 6. The Cr(VI) maximum capacity of PeH-FFe at pH 2 was 33.11 mg Cr(VI)/g, slightly higher than that at pH 6 (31.75 mg Cr(VI)/g). The linear isotherm shows that the pH affect the Cr(VI) distribution into the aqueous/solid phases. The negative value of Δ H ° and positive values of Δ G ° indicate that the chromium adsorption process is an exothermic and non-spontaneous process. The characterization of the peanut husk modified with formaldehyde and peanut husk modified with formaldehyde and Fe by scanning electron microscopy, Raman, and IR spectroscopies as well as the textural characteristics of the no-living biomasses were also considered in this work.
ISSN:	0049-6979 1573-2932