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| Gonçalves Jr.,Affonso C.; Rubio,Fernanda; Meneghel,Ana P.; Coelho,Gustavo F.; Dragunski,Douglas C.; Strey,Leonardo. |
| This study aimed to evaluate the efficacy of crambe seeds (Crambe abyssinica Hochst) as adsorbent material in the removal of the toxic metals cadmium, lead and chromium from contaminated solutions. The byproduct was obtained from oil extraction of crambe seeds in a Soxhlet system. In kinetic tests, the adsorbent masses had varied in solutions containing the metals under pH 5.0 and 7.0. Metal concentrations were determined by flame atomic absorption spectrometry (FAAS). According to optimal conditions found, the adsorption assays were performed for obtaining the isotherms of each metal, which were linearized in agreement with the mathematical models of Langmuir and Freundlich. According to the obtained results, the adsorbent was effective in removing the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biosorption; Remediation of waters; Sustainability. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662013000300009 |
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| Gonçalves Junior,Affonso C.; Meneghel,Ana P.; Rubio,Fernanda; Strey,Leonardo; Dragunski,Douglas C.; Coelho,Gustavo F.. |
| This study evaluated the efficacy of moringa seeds (Moringa oleifera Lam.) as an adsorbent material for removing toxic heavy metals such as cadmium, lead, and chromium from contaminated solutions. The effect of the adsorbent mass was investigated at two pH conditions (5.0 and 7.0). The optimized conditions were 0.300 g of adsorbent at pH 5.0, used for the isotherms construction, and linearized according to Langmuir and Freundlich models. Results showed that cadmium adsorption was similar in both the models used. For lead, the Freundlich model had the best adjustment and chromium was better adjusted by the Langmuir model. It was concluded that the adsorbent was effective in the remediation of solutions containing cadmium, lead and chromium, thus, its use as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adsorption; Isotherms; Remediation. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662013000100013 |
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| Gonçalves Jr.,Affonso Celso; Yoshihara,Mayara Mitiko; Carvalho,Endrigo Antonio de; Strey,Leonardo; Moraes,Alice Jacobus de. |
| O cultivo e a utilização de plantas medicinais têm acompanhado a evolução do ser humano desde a antiguidade, assim como o desenvolvimento de técnicas de manejo e cultivo das mesmas. Na busca pela sustentabilidade dos agroecossistemas, o uso de fontes de fertilizantes que forneçam os nutrientes necessários às culturas, deve ser feito de modo a causar o menor impacto ambiental possível. Objetivou-se com este trabalho, avaliar a disponibilidade dos nutrientes N, P, K, Ca, Mg, Cu, Zn, Fe e Mn, e dos metais pesados Cd, Pb e Cr em plantas de estragão (Artemisia dracunculus) submetidas a diferentes fertilizações, orgânica (composto a base de dejeto suíno) e mineral, em Argissolo Vermelho distrófico (PVd). O delineamento experimental foi inteiramente casualisado... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plantas medicinais; Artemisia; Fertilização de plantas. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000200233 |
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