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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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| Boas,Naiza V.; Casarin,Juliana; Caetano,Josiane; Gonçalves Junior,Affonso C.; Tarley,César R. T.; Dragunski,Douglas C.. |
| Objetivou-se, neste trabalho, analisar a eficiência de resíduos de macadâmia (mesocarpo e endocarpo) com e sem modificações químicas na biossorção de íons cobre II. As modificações químicas no biossorvente foram realizadas com hidróxido de sódio (NaOH) e com NaOH mais ácido cítrico e comprovadas por espectroscopia na região do infravermelho, pela presença dos picos em 1710 e 1420 cm-1 como também pela microscopia eletrônica de varredura (MEV) observando-se aumento da rugosidade na superfície. Os melhores resultados de biossorção foram para o mesocarpo modificado com NaOH, em pH igual a 5. O tempo de equilíbrio adsorvente-adsorbato foi de 140 min; além disto, o sistema seguiu um modelo cinético de pseudo-segunda ordem e a capacidade máxima de biossorção foi... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biossorção; Metais; Casca; Resíduo. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662012001200014 |
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| Araujo,Izabela R. C.; Sampaio,Silvio C.; Paz-Gonzalez,Antonio; Vilas-Boas,Márcio A.; Gonçalves Junior,Affonso C.; Szekut,Flávio D.. |
| ABSTRACT The disposal of treated effluents on soil is the main final use of wastewater in Brazil. Although this practice can promote improvements of some soil attributes, there is a need for monitoring in order to ensure that potential environmental impacts are not harmful. Thus, the purpose of this study was to evaluate the effects of treated effluent from a poultry slaughterhouse on the chemical attributes of an Oxisols, in Matelândia-PR, Brazil under drip irrigation. The soil attributes P, K, Fe, Cu, Zn, Mn, pH in CaCl2, H + Al, Al, Ca, Mg, cation exchange capacity (CEC), and percent base saturation (V) were evaluated under four effluent application rates, 0, 100, 200 and 300 m³ ha-1 d-1 with treated effluents on three successive sampling dates. As main... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forestry production; Eucalyptus; Oxisols. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000600439 |
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