High-content, well-dispersed gamma-Fe2O3 nanoparticles encapsulated in macroporous silica with superior arsenic removal performance

Yang, Jie, Zhang, Hongwei, Yu, Meihua, Emmanuelawati, Irene, Zou, Jin, Yuan, Zhiguo and Yu, Chengzhong (2013) High-content, well-dispersed gamma-Fe2O3 nanoparticles encapsulated in macroporous silica with superior arsenic removal performance. Advanced Functional Materials, Early View 1-10. doi:10.1002/adfm.201302561

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Author Yang, Jie
Zhang, Hongwei
Yu, Meihua
Emmanuelawati, Irene
Zou, Jin
Yuan, Zhiguo
Yu, Chengzhong
Title High-content, well-dispersed gamma-Fe2O3 nanoparticles encapsulated in macroporous silica with superior arsenic removal performance
Formatted title
High-content, well-dispersed γ-Fe2O3 nanoparticles encapsulated in macroporous silica with superior arsenic removal performance
Journal name Advanced Functional Materials   Check publisher's open access policy
ISSN 1616-301X
1616-3028
Publication date 2013-10-01
Sub-type Article (original research)
DOI 10.1002/adfm.201302561
Volume Early View
Start page 1
End page 10
Total pages 10
Place of publication Weinheim, Germany
Publisher Wiley - V C H Verlag
Collection year 2014
Language eng
Formatted abstract
Novel composites of iron oxide encapsulated in macroporous silica with excellent arsenic adsorption performance have been successfully developed. Macroporous silica foams with large pore sizes of ≈100 nm and a high pore volume of 1.6 cm3 g−1 are chosen as the porous matrix. Electron tomography technique confirms that γ-Fe2O3 nanoparticles with an average particle size of ≈6 nm are spatially well-dispersed and anchored on the pore walls at even a high γ-Fe2O3 content of 34.8 wt%, rather than forming aggregates inside the pores or on the external surface. The open large-pore structure, high loading amount, and the non-aggregated nature of γ-Fe2O3 nanoparticles lead to increased adsorption sites and thus high adsorption capacities of both As (V) and As (III) without pre-treatment (248 and 320 mg g−1, respectively). Moreover, the composites can reduce the concentration of both As (V) and As (III) from 100 to 2 μg L−1. It is also demonstrated that the composites can be applied in a household drinking water treatment device, which can continuously treat 20 L of wastewater containing As (V) with the effluent concentration lower than the World Health Organization standard.
Keyword Iron oxide nanoparticles
Macroporous silica
Arsenic removal
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 1 OCT 2013

 
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Created: Tue, 14 Jan 2014, 14:09:02 EST by Cathy Fouhy on behalf of Aust Institute for Bioengineering & Nanotechnology