Polypyrrole modified granular activated carbon nanocomposite for treatment of wastewater containing highly toxic hexavalent chromium
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Date
Authors
Setshedi, Katlego Z.
Kalombo, Lonji
Nomadolo, Nomvuyo
Hlekelele, Lerato
Ray, Suprakas Sinha
Maity, Arjun
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley
Abstract
This study explored the fabrication of Polypyrrole (PPy) and Granular
Activated Carbon (GAC) composites (PPy-GAC) for effective removal of toxic
hexavalent chromium (Cr(VI)) from aqueous solutions. Two synthesis
methods are employed: (1) electrostatic deposition of PPy onto pre-charged
GAC paper and (2) in-situ chemical polymerization of pyrrole monomer with
GAC particles. Batch adsorption experiments investigated the impact of
various operational parameters on Cr(VI) removal. Compared to pristine GAC
(54.64 mg g−1), the PPy-GAC composite exhibited a remarkable 3-fold
increase in equilibrium adsorption capacity, reaching 175.44 mg g−1.
Pseudo-second-order kinetic model (R2 > 0.999) accurately described the
adsorption kinetics, while the Langmuir isotherm model (R2 > 0.99) provided
a good fit for the equilibrium data. Maximum adsorption capacity (qmax)
increased with temperature, reaching 204.08, 243.90, and 270.27 mg g−1 at
298, 308, and 318 K, respectively. Furthermore, a fixed-bed column
experiment examined the composite’s effectiveness in continuous Cr(VI)
removal, demonstrating its suitability for practical applications. Notably, the
PPy-GAC composite successfully removed Cr(VI) from a real wastewater
sample containing 68 μg L−1 Cr(VI) obtained from a ferrochrome industry,
highlighting its potential for real-world remediation.
Description
Keywords
Polypyrrole, Aqueous solutions, Batch adsorption, Temperature, SDG-06: Clean water and sanitation
Sustainable Development Goals
SDG-06:Clean water and sanitation
Citation
Setshedi, K.Z., Kalombo, L., Nomadolo, N. et al. 2024, 'Polypyrrole modified granular activated carbon nanocomposite for treatment of wastewater containing highly toxic hexavalent chromium', Macromolecular Materials and Engineering, vol. 309, art. 2300392, pp. 1-14. 10.1002/mame.202300392