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Pb(II) adsorption characteristics of magnetic GO-hydroxyapatite and the contribution of GO to enhance its acid resistance

Pb(II) adsorption characteristics of magnetic GO-hydroxyapatite and the contribution of GO to enhance its acid resistance
Pb(II) adsorption characteristics of magnetic GO-hydroxyapatite and the contribution of GO to enhance its acid resistance

Fe3O4, the functional component of magnetic adsorbent for separation, dissolves readily under acidic conditions, which significantly restricts its application for treatment of acidic wastewater such as acid mine drainage. Thus, this study developed a new method to improve the acid resistance of Fe3O4 by doping it with graphene oxide (GO). Firstly, the effects of GO load on the adsorption capacity and dissolution behavior of magnetic hydroxyapatite (MP) and magnetic GO-hydroxyapatite (PMGO) under acidic environment were investigated. Then, as a novel adsorbent, PMGO was characterized by SEM, EDS, XPS, FTIR, Raman, XRD, BET, TGA and VSM, meanwhile its adsorption mechanism and practicability were explored. It is found that the load of GO in PMGO enhanced the specific surface area from 84.21 (MP) to 158.72 m2/g (PMGO), the pore size was reduced from 21.10 to 0.41 nm, the adsorption capacity was increased from 178.40 to 274.73 mg/g. At pH of 2.06, MP was tough to recycle, while PMGO still maintained 90.10% magnetism, suggesting that the addition of GO into MP reduced its dissolution under acidic conditions. Moreover, with a favorable application potential, PMGO after 5 cycles of reuse still possessed 97.49 mg/g adsorption capacity. This study developed a GO doped magnetic adsorbent with significantly improved acid resistance, allowing magnetic adsorbent to be applied under acidic conditions. The findings have promising application in mine industry for heavy metal ion removal from acidic mining drainage.

Acid resistance, Adsorption, Graphene oxide, Hydroxyapatite, Magnetic
2213-3437
Li, Ruifeng
52d5e71b-5b46-4eb5-b563-5046b8936560
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Li, Guihong
d9b52eee-1fd5-4b82-9019-f370854557ce
Qiu, Haiyan
a335b6ab-73e7-47ef-926a-d90cc9d8b896
Xu, Bo
8bb0f7b7-2563-4623-a6d4-ffb7d8ff52b7
Xu, Qianxia
726ed0f3-3a8e-408e-be8b-817bf6efacb1
Sun, Ningyan
881cf56f-8a97-4407-be11-a090ba1e4e0a
Zhang, Lihui
f4c7ddcb-73f6-49ca-947d-e9476ce386ca
Li, Ruifeng
52d5e71b-5b46-4eb5-b563-5046b8936560
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Li, Guihong
d9b52eee-1fd5-4b82-9019-f370854557ce
Qiu, Haiyan
a335b6ab-73e7-47ef-926a-d90cc9d8b896
Xu, Bo
8bb0f7b7-2563-4623-a6d4-ffb7d8ff52b7
Xu, Qianxia
726ed0f3-3a8e-408e-be8b-817bf6efacb1
Sun, Ningyan
881cf56f-8a97-4407-be11-a090ba1e4e0a
Zhang, Lihui
f4c7ddcb-73f6-49ca-947d-e9476ce386ca

Li, Ruifeng, Liu, Yongqiang, Li, Guihong, Qiu, Haiyan, Xu, Bo, Xu, Qianxia, Sun, Ningyan and Zhang, Lihui (2021) Pb(II) adsorption characteristics of magnetic GO-hydroxyapatite and the contribution of GO to enhance its acid resistance. Journal of Environmental Chemical Engineering, 9 (4), [105310]. (doi:10.1016/j.jece.2021.105310).

Record type: Article

Abstract

Fe3O4, the functional component of magnetic adsorbent for separation, dissolves readily under acidic conditions, which significantly restricts its application for treatment of acidic wastewater such as acid mine drainage. Thus, this study developed a new method to improve the acid resistance of Fe3O4 by doping it with graphene oxide (GO). Firstly, the effects of GO load on the adsorption capacity and dissolution behavior of magnetic hydroxyapatite (MP) and magnetic GO-hydroxyapatite (PMGO) under acidic environment were investigated. Then, as a novel adsorbent, PMGO was characterized by SEM, EDS, XPS, FTIR, Raman, XRD, BET, TGA and VSM, meanwhile its adsorption mechanism and practicability were explored. It is found that the load of GO in PMGO enhanced the specific surface area from 84.21 (MP) to 158.72 m2/g (PMGO), the pore size was reduced from 21.10 to 0.41 nm, the adsorption capacity was increased from 178.40 to 274.73 mg/g. At pH of 2.06, MP was tough to recycle, while PMGO still maintained 90.10% magnetism, suggesting that the addition of GO into MP reduced its dissolution under acidic conditions. Moreover, with a favorable application potential, PMGO after 5 cycles of reuse still possessed 97.49 mg/g adsorption capacity. This study developed a GO doped magnetic adsorbent with significantly improved acid resistance, allowing magnetic adsorbent to be applied under acidic conditions. The findings have promising application in mine industry for heavy metal ion removal from acidic mining drainage.

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Accepted/In Press date: 3 March 2021
e-pub ahead of print date: 5 March 2021
Published date: August 2021
Keywords: Acid resistance, Adsorption, Graphene oxide, Hydroxyapatite, Magnetic

Identifiers

Local EPrints ID: 448469
URI: http://eprints.soton.ac.uk/id/eprint/448469
ISSN: 2213-3437
PURE UUID: 7e88cbbc-762e-48e5-af32-3ffbe2103b1a
ORCID for Yongqiang Liu: ORCID iD orcid.org/0000-0001-9688-1786

Catalogue record

Date deposited: 22 Apr 2021 16:47
Last modified: 17 Mar 2024 06:28

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Contributors

Author: Ruifeng Li
Author: Yongqiang Liu ORCID iD
Author: Guihong Li
Author: Haiyan Qiu
Author: Bo Xu
Author: Qianxia Xu
Author: Ningyan Sun
Author: Lihui Zhang

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