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• Rev. Ambient. Água 9 (2) • June 2014 • https://doi.org/10.4136/ambi-agua.1340   copy

Adsorption of cadmium in vegetable sponge (Luffa cylindrica)

Adsorção de cádmio em esponja vegetal (Luffa cylindrica)

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstracts

The use of biomass as an adsorbent material follows the principles of sustainability and Green Chemistry. Given the low cost, high abundance, easy availability and high adsorption capacity of the vegetable sponge (Luffa cylindrica), this study aimed to explore the adsorption process of the toxic metal cadmium (Cd). The parameters evaluated were pH, contact time, adsorption isotherms, thermodynamic parameters, percolation and desorption. The proposed method showed high retention of Cd ions, being 99.80% at pH 5.0 for the percolation method, more effective than with stirring, which had 89.6%. It is noteworthy that the vegetable sponge adsorbs significant amounts of Cd in the range of pH 4.0 to 6.0, indicating that is not necessary to adjust pH for most treatments in real samples. The Cd ion is spontaneous and favorably adsorbed by this material, according to the Freundlich isotherm model. According to the obtained results, it is feasible to use vegetable sponge as a material for the remediation of effluents due to high retention of Cd ions.

green chemistry; sustainability; toxic metal

O uso da biomassa como material adsorvente segue os princípios da sustentabilidade e da Química Verde. O presente trabalho teve como objetivo estudar o processo de adsorção de cádmio (Cd) em esponja vegetal (Luffa cylindrica), em função de seu baixo custo, alta abundância, fácil disponibilidade e alta capacidade de adsorção. Neste estudo foram avaliados o pH, o tempo de contato, as isotermas de adsorção, os parâmetros termodinâmicos, a percolação e a dessorção. O método proposto mostrou elevada taxa de retenção de íons Cd na superfície da esponja vegetal, sendo de 99,80 % a um pH de 5,0 para o método de percolação que foi mais eficaz do que por agitação com 89,6 % de adsorção. A esponja vegetal adsorve quantidades significativas de Cd no intervalo de pH de 4,0 a 6,0, o que indica não ser necessário ajustar o pH para a maioria dos tratamentos em amostras reais. De acordo com o modelo de isoterma de Freundlich, a adsorção do íon Cd no material adsorvente estudado é favorável e espontânea, sugerindo o emprego da esponja vegetal Luffa cylindrica como uma opção interessante para a recuperação de efluentes devido à sua elevada capacidade de retenção de íons Cd.

química verde; sustentabilidade; metal tóxico

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Publication Dates

  • Publication in this collection
    30 June 2014
  • Date of issue
    June 2014

History

  • Accepted
    29 May 2014
  • Received
    11 Mar 2014
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This work is licensed under a Creative Commons Attribution 4.0 International License.
Instituto de Pesquisas Ambientais em Bacias Hidrográficas Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHi), Estrada Mun. Dr. José Luis Cembranelli, 5000, Taubaté, SP, Brasil, CEP 12081-010 - Taubaté - SP - Brazil
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