Title: Study of 2,4-dinitrophenol adsorption from aqueous solution on bovine bone char

Authors: Yesid S. Murillo Acevedo; Liliana Giraldo Gutiérrez; Juan Carlos Moreno-Piraján

Addresses: Department of Chemistry, Faculty of Sciences, Universidad Nacional de Colombia, Carrera 30 No. 43-00, Colombia ' Department of Chemistry, Faculty of Sciences, Universidad Nacional de Colombia, Carrera 30 No. 43-00, Colombia ' Department of Chemistry, Faculty of Sciences, Research Group on Porous Solid and Calorimetry, Carrera 1 No. 18 A 10, Edificio Q, Oficina 837, Bogotá, Colombia

Abstract: A sample of bovine bone, an industrial by-product, was submitted to carbonisation at 800°C for 2 h at a heating rate of 3°C min−1 and a N2 flow of 80 cm3 min−1. The char obtained was characterised by nitrogen adsorption isotherms at 77 K using scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. The textural parameters showed a surface area of 171 m2 g−1, pore volume of 0.07 cm3 g−1 and morphological characteristics of meso- and macroporous material. Additionally, adsorption isotherms of 2,4-dinitrophenol (2,4-DNP) were made on the char obtained, and the adsorption behaviour was studied using the models of Langmuir, Freundlich, Redlich-Paterson and Toth. Of these, the one that best describes the adsorption system was the Toth model, which indicates a multilayer adsorption. The adsorption capacity of 2,4-DNP was 41.3 mg L−1, from a model solution of 100 mg L−1. Finally, we evaluated the adsorption kinetics, correlating the experimental data with pseudo-first-order and pseudo-second-order models. It was found that the chemical kinetics of the removal of 2,4-DNP in the bovine char was described by the pseudo-second-order equation, which represented the chemisorption between the adsorbate and adsorbent in a monolayer on the surface.

Keywords: bovine bone; bone char; 2,4-dinitrophenol; 2,4-DNP; Langmuir isotherm; Freundlich isotherm; Redlich-Paterson isotherm; Toth isotherm; adsorption kinetics; nitrogen adsorption isotherms; modelling.

DOI: 10.1504/IJEP.2013.056355

International Journal of Environment and Pollution, 2013 Vol.52 No.1/2, pp.52 - 64

Received: 01 Jan 2011
Accepted: 05 Sep 2011

Published online: 11 Sep 2013 *

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