Carbon dioxide adsorption in chemically activated carbon from sewage sludge

Andrés Almeida, Juan Manuel de and Orjales, Luis and Narros Sierra, Adolfo and Fuente García-Soto, María del Mar de la and Rodríguez Hurtado, María Encarnación (2013). Carbon dioxide adsorption in chemically activated carbon from sewage sludge. "Journal of the Air and Waste Management Association", v. 63 (n. 5); pp. 557-564. ISSN 1096-2247. https://doi.org/10.1080/10962247.2013.772927.

Description

Title: Carbon dioxide adsorption in chemically activated carbon from sewage sludge
Author/s:
  • Andrés Almeida, Juan Manuel de
  • Orjales, Luis
  • Narros Sierra, Adolfo
  • Fuente García-Soto, María del Mar de la
  • Rodríguez Hurtado, María Encarnación
Item Type: Article
Título de Revista/Publicación: Journal of the Air and Waste Management Association
Date: 20 April 2013
Volume: 63
Subjects:
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Química Industrial y del Medio Ambiente
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

In this work, sewage sludge was used as precursor in the production of activated carbon by means of chemical activation with KOH and NaOH. The sludge-based activated carbons were investigated for their gaseous adsorption characteristics using CO2 as adsorbate. Although both chemicals were effective in the development of the adsorption capacity, the best results were obtained with solid NaOH (SBAT16). Adsorption results were modeled according to the Langmuir and Freundlich models, with resulting CO2 adsorption capacities about 56 mg/g. The SBAT16 was characterized for its surface and pore characteristics using continuous volumetric nitrogen gas adsorption and mercury porosimetry. The results informed about the mesoporous character of the SBAT16 (average pore diameter of 56.5 Å). The Brunauer-Emmett-Teller (BET) surface area of the SBAT16 was low (179 m2/g) in comparison with a commercial activated carbon (Airpel 10; 1020 m2/g) and was mainly composed of mesopores and macropores. On the other hand, the SBAT16 adsorption capacity was higher than that of Airpel 10, which can be explained by the formation of basic surface sites in the SBAT16 where CO2 experienced chemisorption. According to these results, it can be concluded that the use of sewage-sludge-based activated carbons is a promising option for the capture of CO2. Implications: Adsorption methods are one of the current ways to reduce CO2 emissions. Taking this into account, sewage-sludge-based activated carbons were produced to study their CO2 adsorption capacity. Specifically, chemical activation with KOH and NaOH of previously pyrolyzed sewage sludge was carried out. The results obtained show that even with a low BET surface area, the adsorption capacity of these materials was comparable to that of a commercial activated carbon. As a consequence, the use of sewage-sludge-based activated carbons is a promising option for the capture of CO2 and an interesting application for this waste.

More information

Item ID: 29330
DC Identifier: http://oa.upm.es/29330/
OAI Identifier: oai:oa.upm.es:29330
DOI: 10.1080/10962247.2013.772927
Official URL: http://www.tandfonline.com/doi/abs/10.1080/10962247.2013.772927#.VGzVIMnpzKE
Deposited by: Memoria Investigacion
Deposited on: 04 Dec 2014 16:07
Last Modified: 01 Sep 2017 18:08
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