In-situ synthesis of zeolites by geopolymerization of biomass fly ash and metakaolin


This study aims to evaluate the in-situ synthesis of zeolites through geopolymerization of biomass fly ash wastes at low temperature in a hermetic container. The raw materials were activated using a mixture of sodium silicate and sodium hydroxide, and then the specimens cured at 60 degrees C to obtain zeolite-containing geopolymers. Hydrogen peroxide (H2O2) was used as a porogenic agent. X-ray diffractograms showed the presence of faujasite zeolites regardless of the added H2O2 content. P zeolite was formed without porogenic agent addition, resulting in increase in the surface area (56.35 m(2)/g) in comparison with samples cured in room conditions (40.69 m(2)/g). The identified zeolites and the mechanical strength (up to similar to 10 MPa) suggest applications as separation membranes or filters. (C) 2018 Elsevier B.V. All rights reserved.



subject category

Materials Science; Physics


De Rossi, A; Simao, L; Ribeiro, MJ; Novais, RM; Labrincha, JA; Hotza, D; Moreira, RFPM

our authors


The authors are very grateful to the Brazilian agency Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) as well as to the Portuguese agency Fundacao para a Ciencia e Tecnologia (FCT) for financial funding.

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