Study of different binders for restoration applications

Stogia, Maria-Evangelia; Dimou, Angeliki-Eirini; Kourkoulis, Stavros K.; Alexopoulos, Nikolaos D.

doi:10.1016/j.prostr.2022.05.086

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…Contrary to our previous study, the GPAO demonstrated a good geopolymerization and retaining of the dye that was not released in water. In addition to this feature, the presence of titania (shown in the XRD spectrum) and the ability to inhibit microbial growth could represent good properties for the application of this geopolymer in the restoration field [ 65 ] and building façade self-cleaning [ 66 , 67 ] and could contribute to the research in hazardous dye inertization.…”

Section: Discussionmentioning

confidence: 99%

Entrapment of Acridine Orange in Metakaolin-Based Geopolymer: A Feasibility Study

et al. 2023

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Few studies have explored the immobilization of organic macromolecules within the geopolymer matrix, and some have found their chemical instability in the highly alkaline geopolymerization media. The present work reports on the feasibility of encapsulating the potentially toxic acridine orange (AO) dye in a metakaolin based geopolymer while maintaining its structural integrity. The proper structural, chemical, and mechanical stabilities of the final products were ascertained using Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric (TGA/DTG), and mechanical analyses, whereas the dye integrity and its stability inside the geopolymer were investigated by the UV-Vis analysis. In addition, the antimicrobial activity was investigated. The FT-IR and XRD analyses confirmed the geopolymerization occurrence, whereas the TGA/DTG and mechanical (compressive and flexural) strength revealed that the addition of 0.31% (AO mg/ sodium silicate L) of AO to the fresh paste did not affect the thermal stability and the mechanical properties (above 6 MPa in flexural strength and above 20 MPa for compressive strength) of the hardened product. UV-Vis spectroscopy revealed that the dye did not undergo chemical degradation nor was it released from the geopolymer matrix. The results reported herein provide a useful approach for the safe removal of toxic macromolecules by means of encapsulation within the geopolymer matrix.

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Section: Discussionmentioning

confidence: 99%