Traduções De Filosofia Medieval No Brasil 1980-2002

Dias, Cleber; Boni, Luis Alberto De

doi:10.15448/1984-6746.2002.3.34888

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“…The absorption of C≡C in the low-intensity stretching between 2260 and 2100 cm -1 is identified in the biochar produced at a temperature of 450 °C and in the expanded pearlite, which was not possible to observe in the other samples, this fact may be associated with the Alkynes group, which has a symmetrical bond, with identical or very similar groups, not absorbed in the infrared (Pavia, 2013). The presence of the aromatic ring in the biochar samples can be identified between the bands of 1600 and 1450 cm -1 with the presence of the C=C group (DIAS et al, 2016;LIU et al, 2013). The finding of the presence of aromatic rings, of structural origin of lignin, even after the process of thermochemical transformation of in natura rice husks into biochar, reinforces its relevance as a conditioner in cultivable soils, and the greater the degree of aromaticity.…”

Section: Resultsmentioning

confidence: 58%

Evaluation of the Properties of Biochar Obtained From Rice Husk for Its Application in Agricultural Soils

Souza,

Modolo,

Santos

et al. 2023

Rev. AIDIS ing. cienc. ambient.

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The increasing world population boosted the demand for basic needs such as energy, water, and food. In turn, agricultural production has increased, generating a large amount of agro-industrial waste every year. Globally, Brazil is the seventh-largest rice producer, and the State of Rio Grande do Sul is responsible for 70% of the rice production in Brazil. Rice husks are composed of organic compounds (cellulose, hemicellulose, lignin, and extractives) and inorganic elements that include potassium, calcium, magnesium, and sulfur. These inorganic elements are essential nutrients in the soil. Since natural degradation is slow due to the aromaticity of lignin, rice husk (RH) waste accumulates and poses an environmental threat, causing air and water pollution. In this context, in order to return the biochar to the soil, the properties of rice husk and rice husk biochar were evaluated. Parameters such as pH, true density, bulk density, porosity, identification of the composition and concentration of the elements, analysis of the functional groups, total carbon (TC), and cation exchange capacity (CEC) were performed on RH biochar samples. These samples were produced in a laboratory-scale pyrolysis rig, under a con-trolled atmosphere of Nitrogen (N), using three peak temperatures (350 °C, 450 °C, and 550 °C) and three soak times (30, 60, and 120 min).Based on the results obtained in the characterization analyses of the biochar, as well as the yield values found, it is concluded that the best pyrolysis temperature for the production of biochar from rice husks, for application in soils, is 550 °C.

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Section: Resultsmentioning

confidence: 58%