Details

Autor(en) / Beteiligte

• Novais, Rui M.
• Buruberri, L.H.
• Seabra, M.P.
• Labrincha, J.A.

Titel

Novel porous fly-ash containing geopolymer monoliths for lead adsorption from wastewaters

Ist Teil von

• Journal of hazardous materials, 2016-11, Vol.318, p.631-640

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •Porous fly ash containing-geopolymer monoliths for lead adsorption were developed.•Geopolymers’ porosity and pH of the ion solution controls the adsorption capacity.•Lead adsorption by the geopolymer monoliths up to 6.34mg/g was observed.•These novel adsorbents can be used in packed beds that are easily collected.•The reuse of biomass fly ash wastes as raw material ensures waste valorization. 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 0.44g/cm3) 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 6.34mglead/ggeopolymer. 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.