Novel porous fly-ash containing geopolymer monoliths for lead adsorption from wastewaters
authors Novais, RM; Buruberri, LH; Seabra, MP; Labrincha, JA
nationality International
journal JOURNAL OF HAZARDOUS MATERIALS
author keywords Geopolymers; Biomass fly ash; Monoliths; Lead adsorption; Porosity
keywords AQUEOUS-SOLUTION; REMOVAL; METAKAOLIN; IONS; EQUILIBRIUM; BIOMASS; BIOSORPTION; ADSORBENT; SPHERES; CHAFF
abstract In this study novel porous biomass fly ash-containing geopolymer monoliths were produced using a simple and flexible procedure. Geopolymers exhibiting distinct total porosities (ranging from 41.0 to 78.4%) and low apparent density (between 1.21 and 0.44 g/cm(3)) were fabricated. Afterwards, the possibility of using these innovative materials as lead adsorbents under distinct conditions was evaluated. Results demonstrate that the geopolymers' porosity and the pH of the ion solution strongly affect the lead adsorption capacity. Lead adsorption by the geopolymer monoliths ranged between 0.95 and 6.34 mg(lead/geopolymer). More porous geopolymers presented better lead removal efficiency, while higher pH in the solution reduced their removal ability, since metal precipitation is enhanced. These novel geopolymeric monoliths can be used in packed beds that are easily collected when exhausted, which is a major advantage in comparison with the use of powdered adsorbents. Furthermore, their production encompasses the reuse of biomass fly-ash, mitigating the environmental impact associated with this waste disposal, while decreasing the adsorbents production costs. (C) 2016 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0304-3894
year published 2016
volume 318
beginning page 631
ending page 640
digital object identifier (doi) 10.1016/j.jhazmat.2016.07.059
web of science category Engineering, Environmental; Engineering, Civil; Environmental Sciences
subject category Engineering; Environmental Sciences & Ecology
unique article identifier WOS:000383003200070
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