Investigating the high gradient magnetic separator function for highly efficient adsorption of lead salt onto magnetic mesoporous silica microspheres and adsorbent recycling

Kheshti, Zeinab; Ghajar, Kourosh Azodi; Moreno-Atanasio, Roberto; Neville, Frances; Ghasemi, Soheila

Title: Investigating the high gradient magnetic separator function for highly efficient adsorption of lead salt onto magnetic mesoporous silica microspheres and adsorbent recycling
Creator: Kheshti, Zeinab; Ghajar, Kourosh Azodi; Moreno-Atanasio, Roberto; Neville, Frances; Ghasemi, Soheila
Relation: Chemical Engineering and Processing - Process Intensification Vol. 148, Issue February 2020, no. 107770
Publisher Link: http://dx.doi.org/10.1016/j.cep.2019.107770
Publisher: Elsevier
Resource Type: journal article
Date: 2020
Description: Herein, a novel magnetite core decorated with amine functionalized mesoporous silica include significant surface area (ca. 885 m g⁻¹) has been successfully prepared. Cetyltrimethylammonium bromide as a pore-forming agent was eliminated from the structure through a combination of two methods (calcination and modified extraction via supercritical CO₂). This inventive strategy leads to form magnetic mesoporous silica microspheres that enhance the capacity of adsorption of Pb²⁺, (ca. 989 mg g⁻¹). In addition, the recycling of this adsorbent from aqueous medium using high gradient magnetic separation (HGMS) was also explored and for obtaining the efficiency of separation some tests were accomplished using different matrix geometries. The separation efficiency of adsorbent via fine-matrix was more successful than a coarse matrix. Utilizing a combined arrangement of a fine and a coarse matrix, the performance of the separation was increased considerably comparing the single-stage separation chamber. About 93% of the magnetic adsorbent could be separated when the flow rate and magnitude of the magnetic field were fixed at 7.2 mL s⁻¹ and 0.33 m T, respectively. Generally, this work was developed high efficient adsorbent for water treatment and well planned separation of adsorbent from treated water by HGMS that can be used in a large-scale.
Subject: core-shell; magnetic mesoporous silica; amine-functionalization; Pb2+ removal; high gradient magnetic separation (HGMS); SDG 12; Sustainable Development Goals
Identifier: http://hdl.handle.net/1959.13/1437633
Identifier: uon:40411
Identifier: ISSN:0255-2701
Language: eng
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