Avaliação do uso de resíduos de marmore e resina de poliuretano vegetal na obtenção de rochas

Cuadernos de Educación y Desarrollo, Journal Year: 2024, Volume and Issue: 16(7), P. e4959 - e4959

Published: July 25, 2024

O Brasil ocupa o 4º lugar dos países que produzem pedras naturais. A indústria de rochas ornamentais é extrema importância para a construção civil, entre as diversas rochas, podemos destacar mármore, muito utilizado em bancadas e revestimentos. Quando placas mármore chegam nas marmorarias, elas são preparadas comercialização, gerando resíduos cacos que, muitas vezes depositados na natureza forma indevida. Apesar disso, estes podem sem utilizados fabricação artificiais. Desta forma, objetivo do presente trabalho foi desenvolver amostras artificiais partir utilizando como matriz resina Poliuretano Vegetal oriunda óleo mamona. Assim, 50 % poliuretano vegetal -200 mmHg foram obtidas Em seguida, medidas porosidade aparente, absorção água densidade aparente das amostras, conforme norma NBR 15845-2 2015.

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Glycerol and ascorbic acid-assisted synthesis of α-MoO3 nanoparticles as an efficient catalyst for biodiesel production

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 3, 2024

This work exhibits a novel method for synthesizing α-MoO₃ nanoparticles (NPs) using convenient recipe that utilizes glycerol and ascorbic acid as polymerizing green complexing agents. Different analytical techniques, including XRD, FT-IR, TGA, scanning electron microscopy (SEM), were employed to identify the as-prepared NPs, it was used catalyst in biodiesel production. Moreover, TPD experiment performed determine catalyst's acidity strength. The exhibited high efficiency producing from oleic ethyl alcohol an oil source alcohol, respectively. design of experiments optimization process also response surface methodology (RSM) attain optimal condition. influences several parameters, such dosage, reaction time, medium temperature, fatty (in molar ratio), studied. results demonstrate at operating variables 75°C, 50 min 30:1 ratio acid, 0.007 g catalyst, yield production can approach 85%. obtained indicated be efficiently recovered reused four times without significant loss its activity.

Language: Английский

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Development of an impressive method for the synthesis of α-MoO3 nanobelts as an efficient catalyst for biodiesel production

Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(57), P. 65273 - 65287

Published: Nov. 22, 2024

Language: Английский

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