An insight into the reactions occurring during the chemical activation of bone char
MetadataShow full item record
The valorisation of animal wastes by pyrolysis has shown to be of interest, due to the versatility of the main compound of char, hydroxyapatite (HAP), which can be used in catalysis, electrochemistry, and adsorption. The utility of HAP depends to a great extent on its textural properties, which can be developed by chemical activation, through gasification reactions. In the present work thermogravimetric analysis coupled to mass spectrometry was used to gain insight into the reactions occurring during the chemical activation of pork bone char with different agents: H3PO4, H2SO4, NaOH and K2CO3. Moreover, the role of each activation reagent in the enhancement of porosity was determined. The treatment with H2SO4 resulted in a highly microporous material, suitable to be used in gaseous pollutant adsorption. Chemical activation with NaOH and K2CO3, on the contrary, led to a more equilibrated increase of micro- and mesoporosity, resulting in a hierarchical porous material, with an excellent potential for applications as electrode, in gas storage, catalysis and energy storage. Regarding H3PO4, it was extremely aggressive under the operating conditions used, since it removed almost all the porous structure of HAP. These results are useful to optimize the preparation method of HAP, in order to configure a material with the desired textural properties.
Is part ofChemical Engineering Journal, 2014, vol. 251, p. 217-227
European research projects
Showing items related by title, author, creator and subject.
Conversion of waste animal bones into porous hydroxyapatite by alkaline treatment: effect of the impregnation ratio and investigation of the activation mechanism Iriarte-Velasco, Unai; Sierra, Irene; Zudaire Villanueva, Lorena; Ayastuy, José L. (Springer, 2015-08-06)Microporous biochars, mainly composed by hydroxyapatite (HAp), were prepared from animal waste bones. In this study, a three-step procedure including pre-pyrolysis, chemical treatment with NaOH, KOH and K2CO3, and pyrolysis ...
Corrigendum to ‘Quality and bioaccessibility of total phenols and antioxidant activity of calçots (Allium cepa L.) stored under controlled atmosphere conditions’ Postharvest Biology and Technology 129 (2017) 118-128 Zudaire Villanueva, Lorena; Viñas Almenar, Inmaculada; Abadias i Sero, Mª Isabel; Simó Cruanyes, Joan; Echeverría Cortada, Gemma; Plaza, Lucía; Aguiló-Aguayo, Ingrid (Elsevier, 2017)
Quality and bioaccessibility of total phenols and antioxidant activity of calçots (Allium cepa L.) stored under controlled atmosphere conditions Zudaire Villanueva, Lorena; Viñas Almenar, Inmaculada; Abadias i Sero, Mª Isabel; Simó Cruanyes, Joan; Echeverría Cortada, Gemma; Plaza, Lucía; Aguiló-Aguayo, Ingrid (Elsevier, 2017)Calçots are the floral stems of the second-year onion (Allium cepa L.) resprouts with economic importance in Spain, where they are usually consumed roasted. The effect of two controlled atmospheres (CA) of 2.0% O2 + 3.5% ...