Surface complexation mechanism and modeling in Cr(III) biosorption by a microalgal isolate, Chlorella miniata

Journal of Colloid and Interface Science
Xu HanNora Fung Yee Tam

Abstract

The mechanism involved in the removal of Cr(III) by a green microalgal isolate, Chlorella miniata, was examined based on a series of batch experiments and microscopic analyses, and a mathematical model was proposed. Results showed that Cr(III) biosorption increased with the increase of pH from 2.0 to 4.5, and no significant changes in biosorption outside this pH range. Langmuir isotherm indicated that the maximum Cr(III) sorption capacity of Chlorella miniata was 14.17, 28.72, and 41.12 mg g(-1) biomass at pH 3.0, 4.0, and 4.5, respectively. Results from desorption studies, SEM (scanning electron microscopy), TEM (transmission electron microscopy), and EDX (energy-dispersive X-ray spectroscope) analyses confirmed that surface complexation was the main process involved in Cr(III) biosorption. Potentiometric titration revealed that carboxyl (pKa1 = 4.10), phosphonate (pKa2 = 6.36) and amine (pKa3 = 8.47) functional groups on the surface of Chlorella miniata were the possible sites for Cr uptake, and their average amounts were 0.53, 0.39, and 0.36 mmol g(-1) biomass, respectively. A surface complexation model further indicated that carboxyl group played the main role in Cr(III) complexation, with a binding constant of K11 = 1.87 x...Continue Reading

Citations

Mar 23, 2011·Mikrochimica Acta·Izabela MichalakKrzysztof Marycz
Apr 7, 2012·Journal of Hazardous Materials·Mayla Santos RodriguesAttilio Converti
Aug 30, 2008·Journal of Hazardous Materials·A P S BatistaA H Rosa
Aug 24, 2007·Bioresource Technology·Ozgür Dogan UluozluMustafa Soylak
Jan 2, 2007·Journal of Hazardous Materials·Xu HanNora Fung Yee Tam
Dec 22, 2014·Ecotoxicology and Environmental Safety·K Suresh KumarKyung-Hoon Shin
Jul 12, 2016·Journal of Environmental Management·Amin Keyvan ZeraatkarMark P McHenry
Sep 9, 2017·Critical Reviews in Food Science and Nutrition·Derong LinSuqing Li
May 21, 2020·Frontiers in Microbiology·Sergio BalzanoChristophe Brunet

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