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Quercus robur acorn peel as a novel coagulating adsorbent for cationic dye removal from aquatic ecosystems

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posted on 2025-05-11, 13:13 authored by Saranya Kuppusamy, Kadiyala Venkateswarlu, Thavamani PalanisamiThavamani Palanisami, Yong Bok Lee, Ravendra NaiduRavendra Naidu, Mallavarapu Megharaj
Oak acorn peel (OP) was used in natural form for the removal of cationic dyes, methylene blue (MB), acridine orange (AO) and malachite green (MG) from aqueous solutions. OP removed 60–97% of 600 mg L-1 dyes at wide ranging pH (2–10). Adsorption equilibriums were attained within 3 h. Sorbent (5 g L-1) adsorption capacity was 109.43, 115.92 and 111.85 mg g-1 for MB, AO and MG, respectively. Adsorption kinetics was described using pseudo-second-order model. Equilibrium adsorption data were interpreted by Langmuir and Freundlich isotherms. Dye removal was by coagulation-coupled adsorption. Coagulation was due to the formation of complexes between the dye molecules and OP polyphenols that led to the deposition of precipitated flocs.

History

Journal title

Ecological Engineering

Volume

101

Issue

April 2017

Pagination

3-8

Publisher

Elsevier

Language

  • en, English

College/Research Centre

Faculty of Science and Information Technology

School

Global Centre for Environmental Remediation (GCER)

Rights statement

© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.