resumo
In this work novel, porous biomass fly ash-containing geopolymers with high pH buffer capacity and tailored alkalis leaching were produced by using hydrogen peroxide as blowing agent. Results demonstrate that the geopolymers leaching rate can be controlled by the hydrogen peroxide content and by the solids-to-liquid ratio during geopolymers preparation. Total leaching of hydroxyl ions from the porous geopolymers ranged between 0.0104 and 0.0180 mol/(dm(3) g). Higher solids-to-liquid ratios promoted a gentler alkalis leaching from the geopolymers, while higher porosities shifted the initial pH towards higher values without compromising their buffering ability. The excellent ability to control pH over time shown by these novel geopolymers demonstrates their potential as pH regulators in applications where high buffer capacity is required. Furthermore the reuse of biomass fly ash in these innovative materials reduces the environmental footprint associated with this waste disposal. (C) 2016 Elsevier Ltd. All rights reserved.
palavras-chave
LOW THERMAL-CONDUCTIVITY; RED MUD; METAKAOLIN; ACTIVATION; POROSITY; RATIOS; TILES; WATER
categoria
Science & Technology - Other Topics; Engineering; Environmental Sciences & Ecology
autores
Novais, RM; Buruberri, LH; Seabra, MP; Bajare, D; Labrincha, JA
nossos autores
João António Labrincha Baptista
Professor Catedrático
Leire Hernando Buruberri
Estudante de doutoramento
Maria Paula Seabra
Professor Auxiliar
Rui Miguel Novais
Professor Auxiliaragradecimentos
This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement.