Source: http://www.agraria.pro.br/ojs-2.4.6/index.php?journal=agraria&page=article&op=view&path%5B%5D=agraria_v13i4a5590
Timestamp: 2019-04-20 22:57:22+00:00

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O lodo de esgoto é um subproduto do tratamento de efluentes. Quando processado, este resíduo também pode ser usado como adsorvente. O objetivo deste trabalho foi produzir adsorventes a partir do lodo de esgoto, caracterizar sua estrutura e avaliar a eficiência na adsorção de compostos lipofílicos de madeira. O lodo de esgoto foi calcinado a sete temperaturas (400- 1000°C) por cinco horas. As propriedades de morfologia e textura dos materiais foram avaliadas por microscopia eletrônica de varredura e isotermas de nitrogênio. A presença de grupos funcionais químicos em sua superfície foi analisada por espectroscopia de infravermelho por transformada de Fourier. A taxa de adsorção do composto lipofílico foi avaliada por cromatografia gasosa -espectrometria de massa. Os resultados foram comparados com o talco, adsorvente tradicionalmente utilizado pela indústria. O aumento da temperatura contribuiu diretamente para a diminuição da área superficial específica. Os adsorventes obtidos entre 600 e 700°C removeram mais de 60% dos compostos lipofílicos da madeira, correspondendo a 94,1% da quantidade total de compostos. Esses valores são muito superiores aos apresentados pelo talco, sendo 2 e 11,8%, respectivamente. Portanto, os adsorventes produzidos podem ser estudados como um novo material na remoção de compostos de madeira lipofílicos.
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