Red mud-based geopolymers with tailored alkali diffusion properties and pH buffering ability
authors Ascensao, G; Seabra, MP; Aguiar, JB; Labrincha, JA
nationality International
journal JOURNAL OF CLEANER PRODUCTION
author keywords Geopolymer; Red mud; Alkali leaching; pH buffering
keywords ASH-BASED GEOPOLYMERS; WASTE GLASS; EFFLORESCENCE; POLYMERS; CLAY; AL
abstract 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. (C) 2017 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0959-6526
isbn 1879-1786
year published 2017
volume 148
beginning page 23
ending page 30
digital object identifier (doi) 10.1016/j.jclepro.2017.01.150
web of science category GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Engineering, Environmental; Environmental Sciences
subject category Science & Technology - Other Topics; Engineering; Environmental Sciences & Ecology
unique article identifier WOS:000398425700003
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journal impact factor 5.651
5 year journal impact factor 6.352
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