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Title: Kinetic and equilibrium modeling of adsorption of cobalt(II) from aqueous solutions onto surface modified lignocellulosics (<i style="">Musa paradisiaca)</i>
Authors: Shibi, I G
Anirudhan, T S
Keywords: Graft copolymerization
Banana stalk
Co(II) removal
Langmuir isotherm
Issue Date: Nov-2006
Publisher: CSIR
Series/Report no.: B01D15/00
Abstract: Banana (<i style="">Musa paradisiaca</i>) Stalk (BS), an agricultural waste, modified by graft copolymerization reaction might be the basis of a new approach to remove the metal pollutants from water. The treatment process involves graft copolymerization of acrylamide onto BS using ferrous ammonium sulphate/H<sub>2</sub>O<sub>2</sub> redox initiator system followed by functionalization of carboxylate group (PGBS-COOH). In this paper, the efficiency of the PGBS-COOH in the removal of Co(II) from aqueous solutions has been investigated using batch experiments. The influence of different experimental parameters such as <i style="">p</i>H, contact time, initial concentration of Co(II), adsorbent dose and temperature on the adsorption process has been studied. The maximum adsorption capacity is observed at the <i style="">p</i>H range 6.5-8.0. Maximum removals of 99.7 and 97.2% are observed at Co(II) concentration of 25.0 and 50.0 mg/L, respectively. A kinetic model based on empirical relationship has been derived to predict the percentage Co(II) removal at any time for known amount of sorbent and initial Co(II) concentration. The surface mass-transfer coefficient as a function of temperature has been determined. Kinetic parameters are also evaluated. The Langmuir isotherm model fitted the experimental equilibrium data. The PGBS-COOH had adsorption capacities for Co(II) from 166.66 mg/g at 30°C to 181.46 mg/g at 60°C. Graft copolymerization of BS—an agricultural waste which is found in abundance and has otherwise no significant use and results in a low cost—value-added product which can benefit industry.
Description: 567-575
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.13(6) [November 2006]

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