Synergetic impacts of mesoporous a-Fe2O3 nanoparticles on the performance of alkali-activated slag against fire, gamma rays, and some microorganisms
Sayed, D.G.; El-Hosiny, F.I.; El-Gamal, S.M.A.; Mohammed Ramadan Mohammed; hazem, mahmoud m.;
Abstract
This study describes the fabrication of green composite pastes with multifunctional properties that can be utilized in special applications. Low-cost mesoporous hematite nanoparticles (HNPs) were prepared using a sol-gel technique. Different doses of HNPs (0.25, 0.5, and 1%) were added to alkali-activated slag (AAS) using an aqueous solution of NaOH (5 wt % of slag) as an activator. All composite pastes, AAS and AAS-HNPs, were kept under high humidity at normal temperature for 90 days. After 28 days of curing, a group of specimens was fired at elevated temperatures in a range of 200–900 °C, and another group was exposed to 1000- 3000 KGy gamma radiation. The formed phases and morphological features of some selected composites were characterized using X-ray diffraction (XRD), thermal analyses (TGA/DTG), Fourier transformation infrared (FTIR), and scanning electron microscope with energy dispersive X-ray (SEM/EDX). The outcomes of the compressive strength test emphasized that AAS-0.25 HNPs composite paste has a superior thermal resistivity at all firing temperatures and the best impedance to radiation till 3000 KGy. Agar diffusion test (ASTM D4300-1) revealed that AAS containing 1% HNPs composite possessed an excellent antimicrobial activity with various microorganisms; two bacterial strains (Escherichia Coli ATCC 8739 and Staphylococcus aureus ATCC 6538) and two fungal strains (Aspergillus flavus and Mucor circinelloide).
Other data
Title | Synergetic impacts of mesoporous a-Fe2O3 nanoparticles on the performance of alkali-activated slag against fire, gamma rays, and some microorganisms | Authors | Sayed, D.G. ; El-Hosiny, F.I. ; El-Gamal, S.M.A. ; Mohammed Ramadan Mohammed ; hazem, mahmoud m. | Keywords | Hematite nanoparticles;Mechanical performance;Thermal stability;Gamma radiation;Antimicrobial activity;PORTLAND-CEMENT PASTES;MECHANICAL-PROPERTIES;GEOPOLYMER CEMENT;ASH;RESISTANCE;CONCRETE;BEHAVIOR;ANATASE;ENERGY;FE2O3 | Issue Date | 2022 | Publisher | ELSEVIER | Journal | Journal of Building Engineering | Volume | 57 | ISSN | 23527102 | DOI | 10.1016/j.jobe.2022.104947 | Scopus ID | 2-s2.0-85134427521 | Web of science ID | WOS:000831650500002 |
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