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- Title
One-pot synthesis of nano-EMD for effective adsorption of toxic dyes.
- Authors
Biswal, Avijit; Dhal, Jyoti Prakash; Das, Bijnyan Ranjan; Panda, Prasanna Kumar; Tripathy, Bankim Chandra
- 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.
- Subjects
ELECTROLYTIC manganese; MALACHITE green; MANGANOUS sulfate; ADSORPTION kinetics; DYES &; dyeing
- Publication
Transactions of the Charles S. Peirce Society, 2024, Vol 60, Issue 1, p166
- ISSN
0009-1774
- Publication type
Article
- DOI
10.1680/jnaen.22.00061