Melamine sponge loading improves the separation performance of magnetic hydroxyapatite for Pb(Ⅱ) adsorption
Melamine sponge loading improves the separation performance of magnetic hydroxyapatite for Pb(Ⅱ) adsorption
Magnetic materials as adsorbents for wastewater treatment have attracted considerable attention because of the ease of separation of adsorbents for reuse. However, the efficient separation of magnetic materials, particularly nanoscale materials, remains challenging. Therefore, in this study, we developed an innovative method to enhance the separation performance of magnetic hydroxyapatite (MP) using melamine sponge (MS) loading. It was found that, although the magnetic moments of MP decreased from 15.54 emu/g to 11.51 emu/g after MS loading, MS-loaded MP (MPMS) exhibited better magnetic separation performance than MP. The analysis of adsorption isotherms suggests that the theoretical maximum adsorption capacity of Pb2+ at an initial pH of 4.85 using MPMS was 139.28 mg/g. Combined with adsorption kinetics and thermodynamics analysis, adsorption was categorized as a chemical, heterogeneous, and endothermic process. Moreover, in the adsorption mechanism, cation exchange, electrostatic interaction, dissolution/precipitation, and surface complexation mechanisms contributed 70.96%, 4.39%, 6.10%, and 18.55%, respectively, to the total Pb2+ removal under the experimental conditions. Hence, we provide a quick and low-cost solution for enhancing the downstream separation of magnetic adsorbents for reuse.
Heavy metal, Hydroxyapatite, Magnetic adsorption, Melamine sponge, Separation performance
Li, Ruifeng
52d5e71b-5b46-4eb5-b563-5046b8936560
Lan, Guihong
454521c8-d07c-481a-8929-b1730e34b995
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Qiu, Haiyan
a335b6ab-73e7-47ef-926a-d90cc9d8b896
Ding, Xianfeng
fbb2782f-df60-469a-9a78-a5ba27bbd3a2
Xu, Bo
8bb0f7b7-2563-4623-a6d4-ffb7d8ff52b7
Deng, Chunping
d33a37b4-3240-4649-88ca-a0647fba0e4e
15 June 2022
Li, Ruifeng
52d5e71b-5b46-4eb5-b563-5046b8936560
Lan, Guihong
454521c8-d07c-481a-8929-b1730e34b995
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Qiu, Haiyan
a335b6ab-73e7-47ef-926a-d90cc9d8b896
Ding, Xianfeng
fbb2782f-df60-469a-9a78-a5ba27bbd3a2
Xu, Bo
8bb0f7b7-2563-4623-a6d4-ffb7d8ff52b7
Deng, Chunping
d33a37b4-3240-4649-88ca-a0647fba0e4e
Li, Ruifeng, Lan, Guihong, Liu, Yongqiang, Qiu, Haiyan, Ding, Xianfeng, Xu, Bo and Deng, Chunping
(2022)
Melamine sponge loading improves the separation performance of magnetic hydroxyapatite for Pb(Ⅱ) adsorption.
Separation and Purification Technology, 291, [120851].
(doi:10.1016/j.seppur.2022.120851).
Abstract
Magnetic materials as adsorbents for wastewater treatment have attracted considerable attention because of the ease of separation of adsorbents for reuse. However, the efficient separation of magnetic materials, particularly nanoscale materials, remains challenging. Therefore, in this study, we developed an innovative method to enhance the separation performance of magnetic hydroxyapatite (MP) using melamine sponge (MS) loading. It was found that, although the magnetic moments of MP decreased from 15.54 emu/g to 11.51 emu/g after MS loading, MS-loaded MP (MPMS) exhibited better magnetic separation performance than MP. The analysis of adsorption isotherms suggests that the theoretical maximum adsorption capacity of Pb2+ at an initial pH of 4.85 using MPMS was 139.28 mg/g. Combined with adsorption kinetics and thermodynamics analysis, adsorption was categorized as a chemical, heterogeneous, and endothermic process. Moreover, in the adsorption mechanism, cation exchange, electrostatic interaction, dissolution/precipitation, and surface complexation mechanisms contributed 70.96%, 4.39%, 6.10%, and 18.55%, respectively, to the total Pb2+ removal under the experimental conditions. Hence, we provide a quick and low-cost solution for enhancing the downstream separation of magnetic adsorbents for reuse.
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Accepted/In Press date: 14 March 2022
e-pub ahead of print date: 17 March 2022
Published date: 15 June 2022
Additional Information:
Funding Information:
This study was funded by the Sichuan Science and Technology Program (2019YJ0514). The authors gratefully acknowledge Shiyanjia Lab (www.shiyanjia.com), the editors for handling this article, and the constructive reviews of anonymous reviewers.
Funding Information:
This study was funded by the Sichuan Science and Technology Program (2019YJ0514). The authors gratefully acknowledge Shiyanjia Lab (www.shiyanjia.com), the editors for handling this article, and the constructive reviews of anonymous reviewers.
Publisher Copyright:
© 2022
Keywords:
Heavy metal, Hydroxyapatite, Magnetic adsorption, Melamine sponge, Separation performance
Identifiers
Local EPrints ID: 456347
URI: http://eprints.soton.ac.uk/id/eprint/456347
ISSN: 1383-5866
PURE UUID: 7543e76b-5efb-4744-a792-61784e5c3d8d
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Date deposited: 27 Apr 2022 02:25
Last modified: 18 Mar 2024 05:37
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Contributors
Author:
Ruifeng Li
Author:
Guihong Lan
Author:
Haiyan Qiu
Author:
Xianfeng Ding
Author:
Bo Xu
Author:
Chunping Deng
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