Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/46665
Título: | Red mud-based geopolymers with tailored alkali diffusion properties and pH buffering ability |
Autor(es): | Ascensão, G. Seabra, M. P. Aguiar, J. L. Barroso de Labrincha, J. A. |
Palavras-chave: | Alkali leaching Geopolymer pH buffering Red mud |
Data: | Mar-2017 |
Editora: | Elsevier Science |
Revista: | Journal of Cleaner Production |
Citação: | Ascensão G., Seabra M. P., Aguiar J. B., Labrincha J. A. Red mud-based geopolymers with tailored alkali diffusion properties and pH buffering ability, Journal of Cleaner Production, Vol. 148, pp. 23-30, doi:10.1016/j.jclepro.2017.01.150, 2017 |
Resumo(s): | This study develop novel porous red mud (RM) based geopolymers and evaluates their potential to ensure prolonged pH control. Several properties of the novel geopolymers were examined including buffering ability, alkalis leaching behaviour, mineralogical composition, microstructure and physical properties. Two experimental plans were defined to evaluate the influence of porosity and RM content on those properties. The pH values of the eluted water and geopolymers OH ions leaching have been determined over time showing that total OH ions and the leaching rate can be tailored by controlling the geopolymers porous structure and the availability of free alkaline species. The lower pH gradient over 28th d (1.64 pH units) was achieved by combining a 0.025 wt% pore forming agent (aluminium powder) with 45 wt% MK replacement by red mud. A high and prolonged buffer capacity was accomplished, proving that red mud-based geopolymers have potential to be applied as pH buffering material. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/46665 |
DOI: | 10.1016/j.jclepro.2017.01.150 |
ISSN: | 0959-6526 |
Versão da editora: | https://doi.org/10.1016/j.jclepro.2017.01.150 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | C-TAC - Artigos em Revistas Internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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2692-2692-Jour.pdf | 2,04 MB | Adobe PDF | Ver/Abrir |