• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/043/0106

    • Keywords

       

      Bentonite; silver; antibacterial activity; sodium treatment; ion exchange.

    • Abstract

       

      Sodium bentonites have excellent cation exchange capacity (CEC) giving them great power of silver adsorption, which enables their use as precursors of antimicrobial materials. Countries like Brazil, however, do not have natural sources of sodium bentonite, only calcium or polycationic clays that do not show the same adsorption and ion exchange potential. In this study, the adsorption of silver in a polycationic bentonite from Quatro Barras, Brazil, previously subjected to a sodium treatment is evaluated. Samples were first modified with Na$_2$CO$_3$ or NaOH and then, subjected to silver impregnation in abatch system under controlled ambient conditions. Antibacterial properties of silver-exchanged clays were evaluated by the disk susceptibility and the minimum inhibitory concentration tests on Escherichia coli and Staphylococcus aureus bacteria. Results show that the sodium treatment with Na$_2$CO$_3$ allowed higher concentrations within a shorter time, increasing the pH without compromising the montmorillonite structure, which resulted on greater CEC and swelling values. Such better performance of the samples previously treated with sodium carbonate also caused an enhanced silver adsorption, resultingon a material of greater antibacterial potential. Experimental adsorption data fitted well to Freundlich isotherm.

    • Author Affiliations

       

      J A ROSÁRIO1 M A P CECHINEL2 C M OLIVEIRA2 A DE NONI3 M PETERSON2 N C KUHNEN3 H G RIELLA3

      1. Laboratório de Tecnologias Limpas, Departamento de Engenharia Ambiental e Sanitária, Universidade do Estado de Santa Catarina – CAV/UDESC, Av. Luiz de Camões, 2090, Conta Dinheiro, Lages, SC 88520-000, Brazil
      2. Laboratório de Reatores e Processos Industriais, IParque/UNESC, 4146, Rod. Gov. Jorge Lacerda, 3978 - Universitário, Criciúma, SC 88040-900, Brazil
      3. Laboratório de Materiais e Corrosão, Departamento de Engenharia Química, UFSC, PO 476, Trindade, Florianópolis, SC 88040-900, Brazil
    • Dates

       
    • Supplementary Material

       
  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.