Non‐ideal metal binding model for Cr(III) sorption using Spirulina platensis biomass: Experimental and theoretical approach. (24th January 2013)

• Record Type: Journal Article
• Authors: Gagrai, Mahesh Kumar; Das, Chandan; Golder, Animes Kumar
• Is Part Of: Canadian journal of chemical engineering. Volume 91:Number 12(2013)
• Page Start: 1904
• Page End: 1912
• Publication Date: 2013-01-24
• Subjects: Chemical engineering -- Periodicals; Technology -- Periodicals; 660.05
• DOI: 10.1002/cjce.21772
• Languages: English
• ISSNs: 0008-4034

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <sec id="cjce21772-sec-0001" sec-type="section"> <p>Removal of Cr(III) from aqueous solution using <italic>Spirulina</italic> biomass was studied in a batch experiment. <italic>Spirulina</italic> biomass was characterised before and after Cr(III) sorption using FTIR, SEM and potentiometric titration. The effects of experimental parameters such as solution pH, contact time, biomass dose, initial Cr(III) concentration and temperature were studied. pH had significant influence on Cr(III) uptake capacity of biomass. The optimum equilibrium solution pH was found as 6.2. Biosorption efficiency decreased at higher temperature. A simple proton binding model was investigated for the quantitative determination of acid–base characteristics of <italic>Spirulina</italic>. The dissociation constants (p<italic>K</italic>_a) of 1.19, 2.87 and 8.07 mol L⁻¹ were estimated, which correspond to carboxylic, phosphatic and amine groups, respectively. A modified metal binding model was then tested, and Cr(III) binding constants (<italic>K</italic>_{<italic>θ</italic>}) of 80.9, 3.9 × 10³ and 3.5 × 10⁴ L mol⁻¹ were found for carboxylic, phosphatic and amine groups, respectively.</p> </sec> </abstract>