One-pot synthesis of nano-EMD for effective adsorption of toxic dyes.

Item request has been placed! ×
Item request cannot be made. ×
loading   Processing Request
Read Online Read More Add to Saved list
  • Additional Information
    • Subject Terms:
      ELECTROLYTIC manganese; MALACHITE green; MANGANOUS sulfate; ADSORPTION kinetics; DYES & dyeing
    • Abstract:
      A simple electrochemical technique was employed to synthesize nanocorn electrolytic manganese dioxide (MnO2) (EMD) in the presence of the structure-directing agent poly(vinylpyrrolidone) (PVP) at the optimum concentration in an aqueous acidic manganese sulfate bath. X-ray diffraction and scanning electron microscopy analyses confirmed the formation of γ-manganese dioxide with nanocorn-shaped crystals at the optimum concentration – namely, 20 mg/l PVP. The finely ground material was successfully employed in the removal of the toxic dyes Chicago sky blue (CSB) and malachite green (MG) from aqueous solution. Various process parameters such as different adsorbents, adsorbent dose, contact time, initial dye concentration and pH were varied and optimized for both dyes. It was found that EMD20PVP showed 99.61% adsorption efficiency at an optimum dose of 0.04 g/20 ml of the 100 mg/l CSB dye solution at room temperature within 20 min. However, the same EMD20PVP sample showed 99.5% adsorption efficiency at an optimum dose of 0.07 g/20 ml of the 100 mg/l MG dye solution at room temperature within 120 min. From the adsorption kinetics study, it was concluded that the adsorption process follows pseudo-second-order kinetics and the adsorption isotherm confirms that the reaction follows Langmuir adsorption for both dyes. [ABSTRACT FROM AUTHOR]
    • Abstract:
      Copyright of Transactions of the Charles S. Peirce Society is the property of Indiana University Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)