Characterization of soils on consolidated limestone and its relations to grassland vegetation

Bogosavljević, Jelena; Djordjević, Aleksandar; Šilc, Urban; Dajić-Stevanović, Zora; Aćić, Svetlana; Radmanovic, Svjetlana

doi:10.2298/abs230106006b

Cited by 1 publication

(1 citation statement)

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“…In the study by Taringan et al ., 63 purple passion fruit peels were heat‐treated at 400 °C for 4 h, obtaining ash with high potassium chloride content and potassium carbonate confirmed by indexing the diffraction peaks. However, it is known that environmental factors associated with temperature, soil, water, pH, species, and pluviometric index affect the elemental and molecular composition of the different parts of the plant directly, 72,73 explaining the differences between the crystalline phases in the present study compared to those in the literature. Likewise, Oliveira et al 74 .…”

Section: Resultsmentioning

confidence: 60%

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: Resultsmentioning

confidence: 60%