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Functionalization and Evaluation of Inorganic Adsorbents for the Removal of Cadmium in Wastewater

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Department of Electrical and Electronic Engineering, Universidad de Los Andes, Bogotá 111711, Colombia
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Laboratory of Neuroscience and Circadian Rhythms, School of Medicine, Universidad de Los Andes, Bogotá 111711, Colombia
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Department of Chemistry, Science Faculty, Universidad de Los Andes, Bogotá 111711, Colombia
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Department of Biomedical Engineering, Universidad de Los Andes, Bogotá 111711, Colombia
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Author to whom correspondence should be addressed.
Academic Editor: Frank Alexis
Molecules 2021, 26(14), 4150; https://doi.org/10.3390/molecules26144150
Received: 9 June 2021 / Revised: 30 June 2021 / Accepted: 3 July 2021 / Published: 8 July 2021
(This article belongs to the Special Issue Nanotechnology in Americas)
This study presents the feasibility of using various functionalized substrates, Fe3O4 nanoparticles (NPs) and Al2O3 spheres, for the removal of Cd from aqueous solution. To improve the materials’ affinity to Cd, we explored four different surface modifications, namely (3-Aminopropyl) triethoxysilane (APTES), L-Cysteine (Cys) and 3-(triethoxysilyl) propylsuccinic anhydride (CAS). Particles were characterized by FTIR, FIB-SEM and DLS and studied for their ability to remove metal ions. Modified NPs with APTES proved to be effective for Cd removal with efficiencies of up to 94%, and retention ratios up to 0.49 mg of Cd per g of NPs. Batch adsorption experiments investigated the influence of pH, contact time, and adsorbent dose on Cd adsorption. Additionally, the recyclability of the adsorbent and its potential phytotoxicity and animal toxicity effects were explored. The Langmuir, Freundlich, pseudo-first-order and pseudo-second-order models were applied to describe the behavior of the Cd adsorption processes. The adsorption and desorption results showed that Fe3O4 NPs modified with APTES are promising low-cost platforms with low phytotoxicity for highly efficient heavy metal removal in wastewater. View Full-Text
Keywords: wastewater; cadmium; magnetite nanoparticles; alumina; functionalization wastewater; cadmium; magnetite nanoparticles; alumina; functionalization
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MDPI and ACS Style

Campaña, A.L.; Guillén, A.; Rivas, R.; Akle, V.; Cruz, J.C.; Osma, J.F. Functionalization and Evaluation of Inorganic Adsorbents for the Removal of Cadmium in Wastewater. Molecules 2021, 26, 4150. https://doi.org/10.3390/molecules26144150

AMA Style

Campaña AL, Guillén A, Rivas R, Akle V, Cruz JC, Osma JF. Functionalization and Evaluation of Inorganic Adsorbents for the Removal of Cadmium in Wastewater. Molecules. 2021; 26(14):4150. https://doi.org/10.3390/molecules26144150

Chicago/Turabian Style

Campaña, Ana L., Amaimen Guillén, Ricardo Rivas, Veronica Akle, Juan C. Cruz, and Johann F. Osma 2021. "Functionalization and Evaluation of Inorganic Adsorbents for the Removal of Cadmium in Wastewater" Molecules 26, no. 14: 4150. https://doi.org/10.3390/molecules26144150

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