Novel porous fly ash-containing geopolymers for pH buffering applications
authors Novais, RM; Buruberri, LH; Seabra, MP; Bajare, D; Labrincha, JA
nationality International
journal JOURNAL OF CLEANER PRODUCTION
author keywords Lightweight geopolymer; Biomass fly ash; Buffer capacity; Porosity
keywords LOW THERMAL-CONDUCTIVITY; RED MUD; METAKAOLIN; ACTIVATION; POROSITY; RATIOS; TILES; WATER
abstract 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.
publisher ELSEVIER SCI LTD
issn 0959-6526
year published 2016
volume 124
beginning page 395
ending page 404
digital object identifier (doi) 10.1016/j.jclepro.2016.02.114
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:000375816800039
  ciceco authors
  impact metrics
times cited (wos core): 5
journal impact factor (jcr 2016): 5.715
5 year journal impact factor (jcr 2016): 6.207
category normalized journal impact factor percentile (jcr 2016): 89.018
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