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https://hdl.handle.net/2440/126879
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Type: | Journal article |
Title: | Mg–Al-layered double hydroxide (LDH) modified diatoms for highly efficient removal of Congo Red from aqueous solution |
Author: | Sriram, G. Uthappa, U.T. Losic, D. Kigga, M. Jung, H.Y. Kurkuri, M.D. |
Citation: | Applied Sciences, 2020; 10(7):1-19 |
Publisher: | MDPI |
Issue Date: | 2020 |
ISSN: | 2076-3417 2076-3417 |
Statement of Responsibility: | Ganesan Sriram, U.T. Uthappa, Dusan Losic, Madhuprasad Kigga, Ho-Young Jung, and Mahaveer D. Kurkuri |
Abstract: | In this work, diatomaceous earth (DE) or diatoms are modified with Mg–Al-layered double hydroxide (DE-LDH) using the facile co-precipitation method to demonstrate their application for the removal of toxic dyes such as Congo Red (CR), which was used as a model. Field emission scanning electron microscopy (FE-SEM) characterization confirms the successful modification of diatom microcapsules structures, showing their surface decorated with LDH nano patches with sheet-like morphologies. The surface area of the DE was enhanced from 28 to 51 m²/g after modification with LDH. The adsorption studies showed that the maximum CR removal efficiency of DE and DE-LDH was ~15% and ~98%, respectively at pH 7, which is a significant improvement compared with unmodified DE. The maximum adsorption capacities of DE-LDH were improved ten times (305.8 mg/g) compared with the bare DE (23.2 mg/g), showing very high adsorption performances. The recyclability study of DE-LDH up to five cycles, after desorbing CR either by methanol or by NaOH, showed the efficient removal of the CR by up to three cycles via adsorption. The presented study suggests the promising application of DE-LDH as an effective material for application in the removal of CR from aqueous solutions for industrial wastewater treatment. |
Keywords: | Diatom; layered double hydroxides; zeta potential; Congo Red; dye removal |
Rights: | © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
DOI: | 10.3390/app10072285 |
Grant ID: | http://purl.org/au-research/grants/arc/IH150100003 |
Published version: | http://dx.doi.org/10.3390/app10072285 |
Appears in Collections: | ARC Research Hub for Graphene Enabled Industry Transformation publications Aurora harvest 8 Chemical Engineering publications |
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hdl_126879.pdf | Published Version | 2.55 MB | Adobe PDF | View/Open |
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