Synthesis, thermal behavior in oxidative and pyrolysis conditions, spectroscopic and DFT studies of some alkaline earth metals p-aminobenzoate complexes using TG-DTA, DSC, PXRD and EGA (TG-FTIR) techniques

Teixeira, J. A.; Fernandes, Richard Perosa; Isquibola, Guilherme; Giovanini, Ana Paula SG; Machado, Antônio Eduardo da Hora; Caires, Flávio Júnior; Ionashiro, Massao

doi:10.1016/j.tca.2022.179184

Cited by 4 publications

(3 citation statements)

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“…The second stage of WL for FAS 13 , FAS 5 , and FAS 7 occurred in the 243.89-442.98 • C, 241.06-453.88 • C, and 244.07-449.67 • C ranges, respectively. Only a tiny WL of 1.37-1.87% was observed, corresponding to a slight exothermic peak around 330 • C, which may be ascribed to a recrystallization process [41]. In the third stage of the thermal behaviors, WL of 8.36% for FAS 13 , 10.86% for FAS 5 , and 6.21% for FAS 7 was observed in the 442.98-733.79 • C, 453.88-788.18 • C, and 449.67-775.33 • C ranges, respectively.…”

Section: Tg/dtg-dsc Analysismentioning

confidence: 96%

“…In the third stage of the thermal behaviors, WL of 8.36% for FAS 13 , 10.86% for FAS 5 , and 6.21% for FAS 7 was observed in the 442.98-733.79 • C, 453.88-788.18 • C, and 449.67-775.33 • C ranges, respectively. Thermal events were small in the DSC curves, suggesting that exothermic and endothermic reactions occurred simultaneously, probably the thermal decomposition and oxidation of Fe 2 (OH) 2 CO 3 and its gaseous product such as carbon dioxide [41]. The WL of FAS 13 was greater than that of FAS 7 , indicating a larger content of Fe 2 (OH) 2 CO 3 in FAS 13 and corresponding higher removal efficiency for TP.…”

Section: Tg/dtg-dsc Analysismentioning

confidence: 96%

“…In the first stage, the WL of 24.33% for FAS 13 , 23.63% for FAS 5 , and 17.29% for FAS 7 was observed in the 22.75-243.89 • C, 24.99-241.06 • C, and 20.81-244.07 • C ranges, respectively. The DSC curves of all FAS poly-coagulants in the first stage were composed of several consecutive and overlapping endothermic peaks, which were attributed to the loss of hydroxyl and water molecules bonded in different intensities [20,41]. Furthermore, the higher WL of FAS 13 proved the participation of more crystalline water of raw materials in the reactions to form new functional groups.…”

Section: Tg/dtg-dsc Analysismentioning

confidence: 99%

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Preparation and Application of Fe-Al-SiO2 Poly-Coagulants for Removing Microcystis aeruginosa from Water

et al. 2023

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Novel Fe-Al-SiO2 (FAS) poly-coagulants were prepared by the ball milling method using ferrous sulfate, aluminum sulfate, hydrophobic silica, and sodium carbonate as raw materials. The optimal preparation conditions and effects of preparation parameters on removal efficiencies were obtained by Response Surface Methodology (RSM) and Analysis of Variance (ANOVA). Removal efficiencies were investigated by employing FAS as the poly-coagulant for algae-laden water. Furthermore, obtained FAS samples were characterized by SEM, FTIR, XRD, and TGA. Results showed that the optimal preparation conditions were n(Fe):n(Al) of 2:1, m(Si):m(Fe+Al) of 1:2, and n(CO32−):n(Fe+Al) of 1.75:1, and the most significant influencing factor was n(CO32−):n(Fe+Al). FAS13 prepared under the above condition had the highest coagulation efficiency for simulated algae-laden water. Removal efficiencies for OD680, TP, and residual Al and Fe concentrations were 92.86%, 90.55%, 0.142 mg/L, and 0.074 mg/L, respectively. Nano-sized spherical particles, excellent thermal stability, and functional groups such as Al–O–Si, Fe–O–Si, and Fe–OH, corresponding to Al2Si2O5(OH)4, Fe7Si8O22(OH)2, and Fe2(OH)2CO3, were observed in FAS13. The coagulation performance of FAS13 was splendid when applied in real algae-laden water. The removal rates of TP, OD680, turbidity, and Chl-α were above 93.87%. The residual Al concentration was at the range of 0.057–0.128 mg/L.

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Section: Tg/dtg-dsc Analysismentioning

confidence: 96%

Section: Tg/dtg-dsc Analysismentioning

confidence: 96%

Section: Tg/dtg-dsc Analysismentioning

confidence: 99%

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