Magnetic Iron Oxide Chestnutlike Hierarchical Nanostructures: Preparation and Their Excellent Arsenic Removal Capabilities
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- 作者：Fangzhi Mou ; Jianguo Guan ; Huiru Ma ; Leilei Xu ; Weidong Shi
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：August 22, 2012
- 年：2012
- 卷：4
- 期：8
- 页码：3987-3993
- 全文大小：392K
- 年卷期：v.4,no.8(August 22, 2012)
- ISSN：1944-8252
文摘
To obtain adsorbents with high As(V) removal capacity and quick magnetic separation simultaneously, we have fabricated maghemite (纬-Fe2O3) and magnetite (Fe3O4) chestnutlike hierarchical nanostructures (CHNs) with strong ferromagnetic property by annealing the Fe2O3 chestnutlike amorphous core/纬-phase shell hierarchical nanoarchitectures (CAHNs) at different temperatures in a nitrogen atmosphere. Compared to the Fe2O3 CAHNs, the saturated magnetization of the as-obtained 纬-Fe2O3 CHNs is enhanced over 10 times, while the As(V) removal capacity is maintained 74% and reaches 101.4 mg路g鈥?. Both of the as-obtained 纬-Fe2O3 and Fe3O4 CHNs can be separated simply and rapidly from treated water by magnetic separation after As(V) adsorption treatment. The As(V) adsorption process of the as-obtained 纬-Fe2O3 CHNs obeys well the Freundlich isotherm model rather than the Langmuir one, suggesting that a multilayered adsorption occurs on the surface of the 纬-Fe2O3 CHNs. Taking advantages of the high adsorption capacity, fast adsorption rate and quick magnetic separation from treated water, the 纬-Fe2O3 CHNs developed in the present study is expected to be an efficient magnetic adsorbent for As(V) removal from aqueous solutions.