Experimental study coupled with thermodynamic assessment of the NiSO4–K2SO4 quasi binary system

Wang, Yaping; Sergeev, Dmitry; Yazhenskikh, Elena; Pillai, Rishi; Müller, Michael; Naumenko, D.

doi:10.1016/j.calphad.2021.102328

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…Therefore, in the values 2θ at 25°, 30°, 31.7°, 42.9°, and 44.9°, characteristic peaks of potassium sulfate (K 2 SO 4 ) were indexed. This result also agrees with the crystallographic information contained in the ICSD card number 79 777, 66,67 which was associated with an orthorhombic crystal structure ( Pmcn ) . The crystallographic planes corresponding to the 2θ peaks at 23.7°, 30.2°, 32.4°, and 39° corresponded to the structure of calcium phosphate – Ca 2 (P 2 O 7 ) of P41 point group and the ICSD card number 73 712 68,69 .…”

Section: Resultssupporting

confidence: 90%

Eco‐friendly biodiesel production using passion fruit peels and cupuaçu seeds: Catalyst development and process optimization

Barros,

Nobre,

Lobo

et al. 2023

Biofuels Bioprod Bioref

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Yellow passion fruit peel and cupuaçu seeds are common wastes. Usually, they have few or no applications and are discarded, causing environmental pollution. To use them in a new way and reduce ecological pollution, we obtained the ash of yellow passion fruit peels by calcination. We characterized it using Fourier‐transform infrared spectroscopy with attenuated total reflectance (FTIR‐ATR), X‐ray fluorescence (XRF), X‐ray diffractometry (XRD), adsorption‐desorption of N2, scanning electron microscopy (SEM), basicity, and soluble alkalinity. It was observed that the ash was mainly composed of potassium (69%) in the form of carbonate, chloride, and sulfate, with a good surface area (11.23 m2 g−1). The cupuaçu butter was also extracted from the cupuaçu seeds and characterized, showing low acidity, peroxide, saponification, and iodine indexes, in addition to presenting a lipid profile with 57% saturated fatty acid and 43% unsaturated fatty acid. Oleic and stearic acids were present in higher proportions. These results demonstrate that this butter can be a sustainable input in biodiesel production. Thus, the ash was used as a heterogeneous catalyst in the butter transesterification. The biodiesel synthesis was optimized, resulting in 97.8% butter conversion into biodiesel under the following conditions: reaction time of 2 h, 5 wt% of catalyst, 80 °C, and a methanol‐to‐oil molar ratio of 30. This work, therefore, shows that it is possible to obtain and utilize bioinputs, such as cupuaçu butter and passion fruit peel ash, to produce biodiesel through transesterification, and the use of waste materials (precisely passion fruit peels and cupuaçu seeds) makes this method a cost‐effective and environmentally friendly approach to biofuel production.

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Section: Resultssupporting

confidence: 90%

Eco‐friendly biodiesel production using passion fruit peels and cupuaçu seeds: Catalyst development and process optimization

Barros,

Nobre,

Lobo

et al. 2023

Biofuels Bioprod Bioref

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“…e electrical properties of the methyl orange dye-doped K 2 SO 4 single crystal are derived from the dielectric constant and the dielectric loss, which are depicted in Figures 9 and 10. e temperature-dependent dielectric constant with applied frequency denotes the formation of the double nature of the crystals [32]. In the spectrum of the dielectric constant, the temperature with the applied frequency gradually increased due to its space charge polarization with the heat and its electric and ionic dipolar nature.…”

Section: Dielectric Analysismentioning

confidence: 99%

Synthesis, Growth, and Characterization of Methyl Orange Dye-Doped Potassium Sulphate Single Crystal and Its Multifaceted Activities

Jini¹,

Aravind²,

Ajitha³

et al. 2022

Advances in Materials Science and Engineering

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Methyl orange dye-doped K2SO4 single crystal has been synthesized by a slow evaporation method, and its properties have been investigated. The powder X-ray diffraction (PXRD) studies on the single crystal confirmed the crystalline property, noncentrosymmetric system, and the space group P63/mmc (D64th) of crystal. The reaction involved in the functional group of the grown crystal has been confirmed from the FTIR analysis. The optical properties of absorbance and band gap were calculated from the UV-Vis analysis. The obtained materials were identified from the EDX analysis. The electron transformation and optical distortion were identified at 270 nm in the photoluminescence study. The transmission electron microscopy method analyzed the morphology of the grown crystal. The dielectrics of the grown crystal were studied. The effect of temperature on the grown crystal was studied using the TG/DTA analysis. The bacterial susceptibility of the grown crystal was evaluated from Gram-positive and Gram-negative bacteria. All the results demonstrated that the grown crystal is suitable for optical, electronic, and bacterial applications.

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Growth and spectra studies of nonlinear optical manganese zinc hydrogen phosphate (MnZnHPO4) single crystals

Krishnamoorthi,

Sundaramoorthi,

Ramachandran

et al. 2024

J Mater Sci: Mater Electron

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Experimental study coupled with thermodynamic assessment of the NiSO4–K2SO4 quasi binary system

Cited by 4 publications

References 23 publications

Eco‐friendly biodiesel production using passion fruit peels and cupuaçu seeds: Catalyst development and process optimization

Eco‐friendly biodiesel production using passion fruit peels and cupuaçu seeds: Catalyst development and process optimization

Synthesis, Growth, and Characterization of Methyl Orange Dye-Doped Potassium Sulphate Single Crystal and Its Multifaceted Activities

Growth and spectra studies of nonlinear optical manganese zinc hydrogen phosphate (MnZnHPO4) single crystals

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