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Molecules 2012, 17(1), 703-715; doi:10.3390/molecules17010703
Article

Controlled Fabrication of Flower-like Nickel Oxide Hierarchical Structures and Their Application in Water Treatment

* , *  and
Department of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China
* Authors to whom correspondence should be addressed.
Received: 22 December 2011 / Revised: 4 January 2012 / Accepted: 9 January 2012 / Published: 12 January 2012
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Abstract

Flower-like NiO hierarchical structures with 2–5 μm diameter assembled from nanosheet building blocks have been successfully fabricated via a wet-chemical method combined with thermodecomposition technology. The template-free method is facile and effective in preparing flower-like NiO superstructures in high yield. The intermediate product and final hierarchical structures are characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform IR (FTIR), and thermogravimetric analysis (TGA). The effects of growth temperature and reaction time on the morphologies of the as-prepared structures were investigated by SEM characterization and a possible mechanism for the formation of flower-like NiO is proposed. Based on the nitrogen adsorption and desorption measurements, the BET surface area of the as-obtained sample is 55.7 m2/g and the pore-size distribution plot indicates a bimodal mesopore distribution, with pore sizes of ca. 2.6 nm and 7.4 nm, respectively. In comparison with sphere-like and rod-like structures, the flower-like NiO hierarchical structures show an excellent ability to rapidly remove various pollutants when used as adsorbent and photocatalyst in waste-water treatment, which may be attributed to its unique hierarchical and porous surface structures.
Keywords: nickel oxide; hierarchical structures; fabrication nickel oxide; hierarchical structures; fabrication
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Tao, F.; Shen, Y.; Wang, L. Controlled Fabrication of Flower-like Nickel Oxide Hierarchical Structures and Their Application in Water Treatment. Molecules 2012, 17, 703-715.

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