A new adsorbent from Jerivá coconut (a native fruit of the Atlantic Forest) was developed through thermal activation at high temperatures and chemical activation using H3PO4. The characterization of activated carbon revealed the functional groups O-H, NH2 and C=C. The morphology showed an irregular and heterogeneous surface, with a pore volume of 0.442 cm3 g−1 and a surface area of 750 m2 g−1. The main variables of the process were evaluated for statistical significance in the removal of the methylene blue dye showing that only the agitation of the system affected the process. Adsorption kinetics were performed at three different concentrations and fitted to nonlinear models where the Avrami-fractional-order model represented the experimental data. Equilibrium occurred within 80 min and was sufficient to remove more than 99% of the initial concentration. The sorption isotherms were performed at four different temperatures, fitted to four nonlinear models. The Sips model obtained the best adjustment, with a maximum adsorption capacity of 254.40 mg g−1, for the highest temperature investigated. The process occurred spontaneously, favorably and endothermically. The results were promising, pointing out that this adsorbent has the potential to remove methylene blue and the treated effluent can be reused for less noble purposes in the industry.
Nesta obra temos um compendio de pesquisas realizadas por alunos e professores atuantes em engenharia e tecnologia com contribuições para a melhoria da sustentabilidade. São apresentados trabalhos teóricos e vários resultados práticos de diferentes formas de aplicação e processos que visam a melhoria de dados causados ao ambiente. Outra característica dos capítulos que compõe este livro é o fato de estarem relacionadas com atividades de pesquisa de diferentes naturezas em várias áreas da engenharia e tecnológica, uma visão multidisciplinar com contribuições relevantes por meio de resultados e discussões, muitas de cunho pratico e com grande aplicabilidade. De abordagem objetiva, a obra se mostra de grande relevância para graduandos, alunos de pós-graduação, docentes e profissionais, apresentando temáticas e metodologias diversificadas, em situações reais Aos autores, agradecemos pela confiança e espirito de parceria.
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