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Sorption of ofloxacin and chrysoidine by grape stalk: a representative case of biomass removal of emerging pollutants from wastewater

Nurchi, Valeria Marina and Crespo-Alonso, Miriam and Pilo, Maria Itria and Spano, Nadia and Sanna, Gavino and Toniolo, Rosanna (2015) Sorption of ofloxacin and chrysoidine by grape stalk: a representative case of biomass removal of emerging pollutants from wastewater. Arabian journal of chemistry , in press. ISSN 1878-5352. eISSN 1878-5379. Article.

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DOI: 10.1016/j.arabjc.2015.01.006

Abstract

Emerging pollutants, as antibiotics or dyes, in aquatic ecosystems are a crucial concern and numerous techniques have been developed for their removal. Efficiency, cost effectiveness, and biodegradability reveal biomass sorption as one of the most appealing methods. This study aims to evaluate the effectiveness of grape stalk as a sorbent for ofloxacin (a fluoroquinolone antibiotic) and chrysoidine (an azo-dye). The kinetic and the thermodynamic aspects of the sorption were studied. A pseudo first-order kinetic behavior is shown by both substances, though the kinetic constants of ofloxacin are almost double than those of chrysoidine. The sorption isotherms, which strictly follow the Langmuir model, show remarkable differences as a function of pH and of biomass size. The trend of Langmuir parameters, Qmax and K, as a function of pH and size, is discussed, and different binding mechanisms are proposed. Kinetic and thermodynamic parameters prefigure grape stalk as a potential biomass for scavenging toxic substances from wastewater.

Item Type:Article
ID Code:10814
Status:In Press
Refereed:Yes
Uncontrolled Keywords:Emerging pollutant, biomass sorption, ofloxacin, chrysoidine, grape stalk, langmuir isotherm
Subjects:Area 03 - Scienze chimiche > CHIM/01 Chimica analitica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:Elsevier / King Saud University
ISSN:1878-5352
eISSN:1878-5379
Deposited On:18 Feb 2015 17:16

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