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  • Bio-inspired fabrication of hierarchical FeOOH nanostructure array films at the air-water interface, their hydrophobicity and application for water treatment.

Bio-inspired fabrication of hierarchical FeOOH nanostructure array films at the air-water interface, their hydrophobicity and application for water treatment.

ACS nano (2013-01-04)
Lei Liu, Liu-Qing Yang, Hai-Wei Liang, Huai-Ping Cong, Jun Jiang, Shu-Hong Yu
ABSTRACT

Hierarchical FeOOH nanostructure array films constructed by different nanosized building blocks can be synthesized at the air-water interface via a bio-inspired gas-liquid 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 α-FeOOH, while a high one could stabilize FeOOH in the form of the γ-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° to 148° or even superhydrophobicity with a CA of 164° 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·g⁻¹ 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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Poly(acrylic acid, sodium salt) solution, average Mw ~1,200, 45 wt. % in H2O
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Poly(acrylic acid, sodium salt) solution, average Mw ~8,000, 45 wt. % in H2O
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Poly(acrylic acid) solution, average Mw ~250,000, 35 wt. % in H2O
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Poly(acrylic acid) solution, average Mw ~100,000, 35 wt. % in H2O
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Poly(acrylic acid) solution, average Mw ~2,000, 50 wt. % in H2O, electronic grade
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Poly(acrylic acid), average Mv ~3,000,000
Supelco
Poly(acrylic acid sodium salt), analytical standard, for GPC, 16,000
Sigma-Aldrich
Poly(acrylic acid)
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Poly(acrylic acid), average Mv ~4,000,000
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Poly(acrylic acid), average Mv ~1,250,000
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Poly(acrylic acid sodium salt), average Mw ~2,100
Sigma-Aldrich
Poly(acrylic acid sodium salt), average Mw ~5,100 by GPC, powder
Sigma-Aldrich
Poly(acrylic acid), average Mv ~450,000
Supelco
Poly(acrylic acid), analytical standard, average Mn 130,000 (Typical)