Magnetic Iron Oxide Chestnutlike Hierarchical Nanostructures: Preparation and Their Excellent Arsenic Removal Capabilities

被引：107

作者：

Mou, Fangzhi ^{[1
]}

Guan, Jianguo ^{[1
]}

Ma, Huiru ^{[1
]}

Xu, Leilei ^{[1
]}

Shi, Weidong ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2012年 / 4卷 / 08期

基金：

中国国家自然科学基金;

关键词：

iron oxide; magnetic properties; hierarchical nanostructures; arsenic adsorption; water treatment; ADSORPTION; GROUNDWATER; MAGHEMITE; AS(V); ALPHA-FE2O3; MECHANISM; OXIDATION; AS(III); GROWTH; FIELD;

D O I：

10.1021/am300814q

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

To obtain adsorbents with high As(V) removal capacity and quick magnetic separation simultaneously, we have fabricated maghemite (gamma-Fe2O3) and magnetite (Fe3O4) chestnutlike hierarchical nanostructures (CHNs) with strong ferromagnetic property by annealing the Fe2O3 chestnutlike amorphous core/gamma-phase shell hierarchical nanoarchitectures (CAHNs) at different temperatures in a nitrogen atmosphere. Compared to the Fe2O3 CAHNs, the saturated magnetization of the as-obtained gamma-Fe2O3 CHNs is enhanced over 10 times, while the As(V) removal capacity is maintained 74% and reaches 101.4 mg.g(-1). Both of the as-obtained gamma-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 gamma-Fe2O3 CHNs obeys well the Freundlich isotherm model rather than the Langmuir one, suggesting that a multilayered adsorption occurs on the surface of the gamma-Fe2O3 CHNs. Taking advantages of the high adsorption capacity, fast adsorption rate and quick magnetic separation from treated water, the gamma-Fe2O3 CHNs developed in the present study is expected to be an efficient magnetic adsorbent for As(V) removal from aqueous solutions.

引用

页码：3987 / 3993

页数：7

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