Geopolymer/Zeolite composite materials with adsorptive and photocatalytic properties for dye removal.

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ID: 262321
2020
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Abstract
This study investigated the adsorption capacities and photocatalytic activities of geopolymer-zeolite composite materials by incorporating different amounts of zeolite and TiO2 in a geopolymer matrix for dye removal. Geopolymers with SiO2/Al2O3 molar ratio of 2.5 were synthesized from metakaolin. The geopolymers containing zeolite and TiO2-doped zeolite exhibited similar behavior in terms of mineral compositions, microstructures and chemical frameworks. The compressive strength of geopolymer-zeolite composite materials decreased with increasing amount of zeolite and TiO2-doped zeolite (0-40 wt%) because of the increase in the porosity of composite materials. The maximum methylene blue adsorption capacity and photocatalytic efficiency of the powdered geopolymer composites with 40 wt% TiO2-doped zeolite was 99.1% and was higher than that of the composites with 40 wt% zeolite without TiO2-doping (92.5%). In addition, the geopolymer composites with TiO2-doped zeolite exhibited excellent stability after repeated usage as photocatalysts. The adsorption capacity and photocatalytic activity of pelletized geopolymer composites decreased because of the reduction in their specific surface area.
Reference Key
pimraksa2020geopolymerzeoliteplos Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Pimraksa, Kedsarin;Setthaya, Naruemon;Thala, Maneerat;Chindaprasirt, Prinya;Murayama, Mitsuhiro;
Journal PloS one
Year 2020
DOI
10.1371/journal.pone.0241603
URL
Keywords
sustainability recycled aggregate concrete eco-friendly geopolymer concrete

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