Comparison of new biosorbents based on chemically modified Lagenaria vulgaris shell

Danijela V. BojićFaculty of Science and Mathematics, Department of Chemistry, University of Niš, 33 Višegradska Street, Niš, 18000, Serbia, Tel./Fax: +381 18 533014

Marjan S. RanđelovićFaculty of Science and Mathematics, Department of Chemistry, University of Niš, 33 Višegradska Street, Niš, 18000, Serbia, Tel./Fax: +381 18 533014Correspondence[email protected]

Aleksandra R. ZarubicaFaculty of Science and Mathematics, Department of Chemistry, University of Niš, 33 Višegradska Street, Niš, 18000, Serbia, Tel./Fax: +381 18 533014

Jelena Z. MitrovićFaculty of Science and Mathematics, Department of Chemistry, University of Niš, 33 Višegradska Street, Niš, 18000, Serbia, Tel./Fax: +381 18 533014

Miljana D. RadovićFaculty of Science and Mathematics, Department of Chemistry, University of Niš, 33 Višegradska Street, Niš, 18000, Serbia, Tel./Fax: +381 18 533014

Milovan M. PurenovićFaculty of Science and Mathematics, Department of Chemistry, University of Niš, 33 Višegradska Street, Niš, 18000, Serbia, Tel./Fax: +381 18 533014

Aleksandar Lj. BojićFaculty of Science and Mathematics, Department of Chemistry, University of Niš, 33 Višegradska Street, Niš, 18000, Serbia, Tel./Fax: +381 18 533014

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Abstract

Sorption characteristics of three Lagenaria vulgaris-based biosorbents: raw biomass (rLVB), acid–base-activated biomass (aLVB) and sulfuric acid-treated biomass (ccLVB), were compared as a function of contact time, initial methylene blue concentration, and initial pH, in order to evaluate the effect of chemical modifications. The adsorption studies of raw and chemically modified L. vulgaris biomass were compared in batch mode. The Fourier transform Infrared spectroscopy (FTIR) results of biosorbents’ characterization showed presence of different functional groups which can be responsible for sorption of MB from aqueous solutions. Moreover, FTIR analysis reveals that acid–base activation of raw biomaterial resulted in hydrolysis of esters providing more reactive sites (–COO⁻), while sulfuric acid-treatment method introduced new functional groups such as –SO₃⁻. Surface functional groups containing oxygen, such as carboxylic, lactonic, and phenolic, are quantified using the Boehm’s method. The kinetics of MB biosorption were found to follow a pseudo-second-order kinetics in all cases, while experimental equilibrium data were fitted to Freundlich, Langmuir, and Dubinin–Radushkevich isotherms by linear regression method. Langmuir model provides the best fitting. The MB biosorption capacity and uptake kinetics are greatly improved by chemical modification of the biomass. Effectiveness of examined biosorbents in MB removal from aqueous solutions can be put in the following order: rLVB < aLVB < ccLVB.

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Acknowlegement

The research was supported by the Serbian Ministry of Education and Science (Grant No. TR34008).

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Comparison of new biosorbents based on chemically modified Lagenaria vulgaris shell

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Comparison of new biosorbents based on chemically modified Lagenaria vulgaris shell

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