Bio-Inspired Fabrication of Hierarchical FeOOH Nanostructure Array Films at the Air鈥揥ater Interface, Their Hydrophobicity and Application for Water Treatment
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- 作者：Lei Liu ; Liu-Qing Yang ; Hai-Wei Liang ; Huai-Ping Cong ; Jun Jiang ; Shu-Hong Yu
- 刊名：ACS Nano
- 出版年：2013
- 出版时间：February 26, 2013
- 年：2013
- 卷：7
- 期：2
- 页码：1368-1378
- 全文大小：830K
- 年卷期：v.7,no.2(February 26, 2013)
- ISSN：1936-086X
文摘
Hierarchical FeOOH nanostructure array films constructed by different nanosized building blocks can be synthesized at the air鈥搘ater interface via a bio-inspired gas鈥搇iquid diffusion method. In this approach, poly(acrylic acid) (PAA) as a crystal growth modifier plays a crucial role in mediating the morphology and polymorph of FeOOH crystals. With the increase of PAA concentration, the shape of the building blocks assembling into FeOOH films can be tailored from nanosheets, to rice spikes, then to branched fibers, and finally to nanowires. What is more, a low concentration of PAA will induce the formation of 伪-FeOOH, while a high one could stabilize FeOOH in the form of the 纬-FeOOH phase. After being modified with a thin layer of polydimethylsiloxane (PDMS), the as-prepared FeOOH films exhibited strong hydrophobicity with water contact angles (CA) from 134掳 to 148掳 or even superhydrophobicity with a CA of 164掳 in the sample constructed by nanosheets. When the FeOOH nanostructures were dispersed in water by ultrasound, they displayed quite promising adsorption performance of heavy metal ions for water treatment, where the highest adsorption capacity can reach 77.2 mg路g鈥? in the sample constructed by nanowires. This bio-inspired approach may open up the possibilities for the fabrication of other functional nanostructure thin films with unique properties.