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Heavy metals sorption on treated wood sawdust.

Abstract

Submitted by Karine Ribeiro ([email protected]) on 2015-11-26T18:16:28Z No. of bitstreams: 1 ARTIGO_AdsorçãoMetaisPesados.pdf: 301293 bytes, checksum: 8807907a0c9ce942d113df3a069b0c8b (MD5)Approved for entry into archive by Oliveira Flávia ([email protected]) on 2015-11-27T17:02:50Z (GMT) No. of bitstreams: 1 ARTIGO_AdsorçãoMetaisPesados.pdf: 301293 bytes, checksum: 8807907a0c9ce942d113df3a069b0c8b (MD5)Made available in DSpace on 2015-12-04T16:51:12Z (GMT). No. of bitstreams: 1 ARTIGO_AdsorçãoMetaisPesados.pdf: 301293 bytes, checksum: 8807907a0c9ce942d113df3a069b0c8b (MD5) Previous issue date: 2006Neste estudo, avaliou-se a capacidade da madeira Paraju (Manilkara longifolia), modificada quimicamente, para a retenção de íons metálicos. A modificação refere-se a um tratamento com ácido cítrico que leva à reação de grupos carboxilato com a celulose da biomassa. A introdução desses grupos foi observada através de espectrometria de infravermelho. Foram realizados ensaios em sistemas de batelada contendo cádmio e cobre. Os ensaios foram conduzidos em condições de equilíbrio, ajustados segundo o modelo de Langmuir. Obteve-se um carregamento máximo nos sistemas contendo apenas um metal, de 0,56 mmol-Cd/g e 0,94 mmol-Cu/g. O carregamento de cádmio reduziu-se de 0,56 mmol-Cd/g para 0,21 mmol-Cd/g, à medida que a concentração de cobre cresceu no sistema mostrando que existe uma competição entre os metais pelos grupos de troca.In the present work, the exchange capacity of Manilkara longifolia sawdust, chemically modified, was studied. The modification was carried out by a chemical treatment with citric acid, which introduced carboxilate groups in the material surface. The introduction of these groups was confirmed by infrared spectroscopy. Cadmium and copper sorption was studied batchwise. Isotherms were drawn and adjusted to the Langmuir model. Maximum loadings of 0.56 mmolCd/g and 0.94 mmolCu/g were achieved in single metal adsorption. Cadmium uptake was reduced from 0.56 mmolCd/g to 0.21 mmolCd/g as the copper concentration increased in the reaction system. These results show that there is a competition between the two metals for the exchange sites

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