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Mbuyazi TB, Ajibade PA. Magnetic iron oxides nanocomposites: synthetic techniques and environmental applications for wastewater treatment. DISCOVER NANO 2024; 19:158. [PMID: 39342049 PMCID: PMC11438764 DOI: 10.1186/s11671-024-04102-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2024] [Accepted: 09/03/2024] [Indexed: 10/01/2024]
Abstract
Nanomaterials are an emerging class of compounds with potential to advance technology for wastewater treatment. There are many toxic substances in industrial wastewater that are dangerous to the aquatic ecosystem and public health. These pollutants require the development of novel techniques to remove them from the environment. Iron oxide nanoparticles are being studied and develop as new technology to address the problem of environmental pollution due to their unique properties and effectiveness against different kind of pollutants. A variety of modified iron oxide nanoparticles have been developed through extensive research that mitigates the shortcomings of aggregation or oxidation and enhances their efficiency as novel remediator against environmental pollutants. In this review, we present synthetic approaches used for the preparation of iron oxide nanoparticles and their corresponding nanocomposites, along with the processes in which the materials are used as adsorbent/photocatalysts for environmental remediation. Applications explored includes adsorption of dyes, photocatalytic degradation of dyes, and adsorption of heavy metal ions. The use of iron oxides nanocomposite in real wastewater samples and recyclability of adsorbents and photocatalysts were also explored.
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Affiliation(s)
- Thandi B Mbuyazi
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg Campus, Private Bag X01, Scottsville, 3209, South Africa
| | - Peter A Ajibade
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg Campus, Private Bag X01, Scottsville, 3209, South Africa.
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Ning J, Zou J, Long Y, Ren X, Cao Y, Li T, Dong A. Monolayer supertubes of Carbon-Armored platinum nanocrystals enabling robust oxygen reduction electrocatalysis. J Colloid Interface Sci 2023; 648:719-726. [PMID: 37321091 DOI: 10.1016/j.jcis.2023.06.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 06/03/2023] [Accepted: 06/06/2023] [Indexed: 06/17/2023]
Abstract
Self-assembled superstructures composed of nanocrystals (NCs) have shown immense potential for enhancing the performance in electrocatalytic applications. However, there has been limited research on the self-assembly of platinum (Pt) into low-dimensional superstructures as efficient electrocatalysts for oxygen reduction reaction (ORR). In this study, we designed a unique tubular superstructure composed of monolayer or sub-monolayer carbon-armored platinum nanocrystals (Pt NCs) using a template-assisted epitaxial assembly approach. The organic ligands on the surface of Pt NCs were in situ carbonized, resulting in few-layer graphitic carbon shells that encapsulate Pt NCs. Due to their monolayer assembly and tubular geometry, the Pt utilization of the supertubes was 1.5 times higher than that of conventional carbon-supported Pt NCs. As a result, such Pt supertubes exhibit remarkable electrocatalytic performance for the ORR in acidic media, with a high half-wave potential of 0.918 V and a high mass activity of 181 A g-1Pt at 0.9 V, which are comparable to commercial carbon-supported Pt (Pt/C) catalysts. Furthermore, the Pt supertubes demonstrate robust catalytic stability, as confirmed by long-term accelerated durability tests and identical-location transmission electron microscopy. This study presents a new approach to designing Pt superstructures for highly efficient and stable electrocatalysis.
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Affiliation(s)
- Jing Ning
- Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200438, China
| | - Jinxiang Zou
- Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200438, China
| | - Ying Long
- Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200438, China
| | - Xiaomeng Ren
- PLA Naval Medical Center, 5 Panshan Rd, Shanghai 200052, China
| | - Yangfei Cao
- Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200438, China.
| | - Tongtao Li
- Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200438, China.
| | - Angang Dong
- Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200438, China.
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Xi X, Wan S, Deng Y, Xia Y, Xiao J, Cao Y, Huang X, Li Z, Yang D, Dong A, Li T. Amphiphilic Self-Assembly of Nanocrystals at Emulsion Interface Renders Fast and Scalable Quasi-Nanosheet Formation. ACS APPLIED MATERIALS & INTERFACES 2022; 14:50354-50362. [PMID: 36315871 DOI: 10.1021/acsami.2c14274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Scalable assembly of nanocrystals (NCs) into two-dimensional (2D) nanosheets has aroused great interest, yet it remains under-explored. This is because current 2D assembly methods rely mainly on the use of solid- or liquid-air interfaces, which are inherently difficult for upscaling and thus lack practicability. Here, with a microemulsion-based amphiphilic assembly technique, we achieve a fast and scalable preparation of free-standing nanosheets comprising few-layer, tightly packed NCs, namely, quasi-nanosheets (quasi-NSs). Acetic acid, acting as both solvent and surface-treatment agent, is used to render the initially hydrophobic NCs amphiphilic, while simultaneously inducing the interfacial instability right after the assembly of NCs at the emulsion interface to afford quasi-NSs. This amphiphilic assembly method is applicable to a variety of NCs, and multicomponent quasi-NSs are also attainable upon coassembly of different types of NCs. In addition, the structural advantages of quasi-NSs in catalysis are showcased by using NiFe2O4 quasi-NSs as electrocatalysts for the oxygen evolution reaction. This work opens a new route for the scalable construction of 2D NC sheets with designated components and functions.
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Affiliation(s)
- Xiangyun Xi
- State Key Laboratory of Molecule Engineering of Polymers and Department of Macromolecular science, iCHEM, Fudan University, Shanghai 200433, China
| | - Siyu Wan
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, iCHEM, Fudan University, Shanghai 200433, China
| | - Yuwei Deng
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, iCHEM, Fudan University, Shanghai 200433, China
| | - Yan Xia
- State Key Laboratory of Molecule Engineering of Polymers and Department of Macromolecular science, iCHEM, Fudan University, Shanghai 200433, China
| | - Jingyu Xiao
- State Key Laboratory of Molecule Engineering of Polymers and Department of Macromolecular science, iCHEM, Fudan University, Shanghai 200433, China
| | - Yangfei Cao
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, iCHEM, Fudan University, Shanghai 200433, China
| | - Xianwu Huang
- State Key Laboratory of Molecule Engineering of Polymers and Department of Macromolecular science, iCHEM, Fudan University, Shanghai 200433, China
| | - Zhicheng Li
- State Key Laboratory of Molecule Engineering of Polymers and Department of Macromolecular science, iCHEM, Fudan University, Shanghai 200433, China
| | - Dong Yang
- State Key Laboratory of Molecule Engineering of Polymers and Department of Macromolecular science, iCHEM, Fudan University, Shanghai 200433, China
| | - Angang Dong
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, iCHEM, Fudan University, Shanghai 200433, China
| | - Tongtao Li
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, iCHEM, Fudan University, Shanghai 200433, China
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