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Physchem, Volume 4, Issue 3 (September 2024) – 2 articles

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17 pages, 5369 KiB  
Article
Geopolymers for Space Applications
by D. Mendoza-Cachú, J. B. Rojas-Trigos, J. Hernández-Wong, T. J. Madera-Santana and E. A. Franco-Urquiza
Physchem 2024, 4(3), 197-213; https://doi.org/10.3390/physchem4030015 - 5 Jul 2024
Viewed by 557
Abstract
Geopolymers are cementitious materials with exceptional mechanical and physical properties, making them suitable for aerospace applications. Considering their excellent performance, the present investigation aims to develop geopolymers with designed physical properties to address some issues in the aerospace industry. In this sense, the [...] Read more.
Geopolymers are cementitious materials with exceptional mechanical and physical properties, making them suitable for aerospace applications. Considering their excellent performance, the present investigation aims to develop geopolymers with designed physical properties to address some issues in the aerospace industry. In this sense, the influence of the alkaline activator on the final properties was evaluated. For the development of the geopolymers, sodium hydroxide and sodium metasilicate solutions were preparedto obtain the alkaline activator. The synthesis process also consisted of a mixing stage using a mixer to obtain a homogenous paste. After mixing, the curing process consisted of a first thermal treatment at 60 °C for 4 h to evaporate the excess water, avoid excessive contraction, and promote strength at early ages. Subsequently, the geopolymers were left at rest for 28 days until the final properties were achieved. The influence of the solid-to-liquidratio (S/L) on the microstructure of the geopolymers was evaluated. For this purpose, X-ray fluorescence spectrometry, X-ray diffraction, and infrared spectrometry analyses were performed. The results show that the content of the alkaline activator promotes variations inthe presence of different crystalline phases, which is more noticeable as the S/L ratio increases. Likewise, the infrared spectra display peaks at different wavelengths regarding the variations in elemental composition, which are more evident with the changes in the S/L ratio. In addition, physical studies, such as thermal conductivity and resistance to gamma radiation were conducted for different geopolymer compositions. The results indicate that changes in properties are not too sensitive to compositional variations, although slight modifications exist. Finally, these studies are significant as aerospace-focused materials are directly exposed to this kind of phenomena. The designed geopolymers have to be able to resist and maintain their properties through exposure to any energy. Full article
(This article belongs to the Section Solid-State Chemistry and Physics)
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16 pages, 3340 KiB  
Article
Facile Fabrication of Pd-Doped CuO-ZnO Composites for Simultaneous Photodegradation of Anionic and Neutral Dyes
by Sumalatha Bonthula, Muna Farah Ibrahim, Aisha Omar Al-Jaber, Al-Dana Faisal Al-Siddiqi, Ramyakrishna Pothu, Tauqeer Chowdhury, Yusuf Siddiqui, Rajender Boddula, Ahmed Bahgat Radwan and Noora Al-Qahtani
Physchem 2024, 4(3), 181-196; https://doi.org/10.3390/physchem4030014 - 27 Jun 2024
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Abstract
This study explores the synthesis and application of Pd-doped CuO-ZnO composites for the simultaneous photodegradation of anionic and neutral dyes. The nanocomposite was synthesized using a hydrothermal technique and characterized using XRD, FTIR, and UV-Vis absorption spectra. Photocatalytic degradation experiments were conducted with [...] Read more.
This study explores the synthesis and application of Pd-doped CuO-ZnO composites for the simultaneous photodegradation of anionic and neutral dyes. The nanocomposite was synthesized using a hydrothermal technique and characterized using XRD, FTIR, and UV-Vis absorption spectra. Photocatalytic degradation experiments were conducted with varying catalyst loadings, revealing optimal conditions for enhanced degradation performance. The nanocomposite exhibited a synergistic effect on the degradation of the dye mixture, following pseudo-first-order kinetics with significant efficiency under sunlight exposure. Moreover, the study evaluated the influence of pH on the degradation process, showing improved efficiency in neutral and basic conditions. Overall, the findings highlight the efficacy of the Pd-doped CuO-ZnO catalyst in degrading complex dye mixtures, offering potential applications for wastewater treatment in various industrial settings. Full article
(This article belongs to the Section Catalysis)
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