Application of TiO<sub>2</sub>-loaded fly ash-based geopolymer in adsorption of methylene blue from water: Waste-to-value approach
<p dir="ltr">This paper aims to explore the removal of methylene blue from wastewater using fly ash-based geopolymer (FAG) modified with titanium dioxide (TiO<sub>2</sub>) <u>nanoparticles</u> referred to as FAG-TiO<sub>2</sub>. Using several analy...
محفوظ في:
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| مؤلفون آخرون: | , |
| منشور في: |
2024
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| الملخص: | <p dir="ltr">This paper aims to explore the removal of methylene blue from wastewater using fly ash-based geopolymer (FAG) modified with titanium dioxide (TiO<sub>2</sub>) <u>nanoparticles</u> referred to as FAG-TiO<sub>2</sub>. Using several analytical techniques, the modified geopolymer was physically and chemically characterized. Additionally, it was investigated how pH, MB concentration, and temperature affected the MB <u>adsorption process</u> utilizing FAG-TiO<sub>2</sub>. Scanning electron microscopy images exhibited a porous morphology. Furthermore,<u> transmission electron microscopy</u> images revealed a nanostructured shape, with <u>nanoparticles</u> clumping together to form small channels suitable for MB adsorption. The stretching vibration of the <u>alumina</u> silicate was seen using the Fourier transform infrared, indicating that geopolymerization was successfully conducted. The developed FAG-TiO<sub>2</sub> showed a remarkable capacity for MB adsorption from the aqueous phase. The Langmuir isotherm model was the best-fitting adsorption model, with a maximum adsorption capacity of 103.19 mg/g at pH 6 and 35 °C. The thermodynamics investigations revealed negative values for <u>Gibbs free energy</u> (ΔGo), emphasizing the spontaneous nature of the processes. While the positive entropy (ΔSo) indicated a significant affinity between the two phases, the positive enthalpy (ΔHo) implies an endothermic reaction. Additionally, <u>hydrogen bonds</u>, n-π, and <u>electrostatic interactions</u> between MB and FAG-TiO<sub>2</sub> facilitated the adsorption process. Furthermore, desorption studies with two different chemicals were used to investigate MB retention onto FAG-TiO<sub>2</sub>. The adsorbents were desorbed using an HCl (0.5 M) reagent where the maximum MB desorption reached 41.95%. <u>Real wastewater</u> samples were also tested, and promising results were found, indicating the possible use of the prepared adsorbent in industrial applications.</p><h2>Other Information</h2><p dir="ltr">Published in: Groundwater for Sustainable Development<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.gsd.2024.101138" target="_blank">https://dx.doi.org/10.1016/j.gsd.2024.101138</a></p> |
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