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Adsorption of toluene and toluene–water vapor mixture on almond shell based activated carbons

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Abstract

The aim of work is to study the adsorption of a common volatile organic compound such as toluene using activated carbons prepared by chemical activation with phosphoric acid of a lignocellulosic precursor, almond shell, under different conditions. The Impregnation ratio, temperature and time of activation were modified to obtain activated carbons with different characteristics. Regarding the characteristics of the activated carbons, the effects of porous structure and surface chemistry on the toluene adsorption capacity from toluene isotherms have been analysed. Results show that the control of properties of the activated carbons, particularly porous structure, highly dependent on the preparation conditions, plays a decisive role on the toluene adsorption capacity of the activated carbons. Concerning the experiments of toluene adsorption conducted in dynamic mode, activated carbons prepared at low temperatures of activation show higher breakthrough times than those obtained for activated carbons prepared at higher activation temperatures. The amount of toluene adsorbed in presence of water vapor in the gas stream lead to a decrease ranging from 33 to 46 % except for carbons prepared at higher temperatures activated that show only a slight decrease in the amount of toluene adsorbed. Activated carbons can be regenerated with soft heat treatment showing a slight decrease in the adsorption capacity. The high toluene adsorption capacities as well as the high breakthrough times obtained in presence of water vapor make these activated carbons suitable for commercial applications.

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Authors and Affiliations

  1. Universidad San Jorge, Autovía A23 Zaragoza-Huesca km 510, Villanueva de Gállego, 50830, Zaragoza, Spain

    A. Martínez de Yuso

  2. Instituto de Carboquímica, CSIC, C/Miguel Luesma 4, 500018, Zaragoza, Spain

    M. T. Izquierdo & B. Rubio

  3. Centro de Química de Évora, Colégio Luís António Verney, Rua Romão Ramalho, 7000-671, Évora, Portugal

    P. J. M. Carrott

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  1. A. Martínez de Yuso
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  2. M. T. Izquierdo
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  3. B. Rubio
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  4. P. J. M. Carrott
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Correspondence to A. Martínez de Yuso.

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Martínez de Yuso, A., Izquierdo, M.T., Rubio, B. et al. Adsorption of toluene and toluene–water vapor mixture on almond shell based activated carbons. Adsorption 19, 1137–1148 (2013). https://doi.org/10.1007/s10450-013-9540-5

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  • DOI: https://doi.org/10.1007/s10450-013-9540-5

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