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Synthesis of hierarchical structured flower-like Ni(OH)2 and NiO and their application in waste water treatment

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6 Author(s)
Peipei Zhang ; Key Lab. of Green Chem. Media & Reactions, Henan Normal Univ., Xinxiang, China ; Xiaoming Ma ; Kui Wang ; Zhikai Tao
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Flower-like Ni(OH)2 and NiO with hierarchical structures were synthesised by a template- and surfactant-free, environmentally friendly chemical precipitation method. The X-ray powder diffraction result indicated that α-Ni(OH)2 and cubic NiO were synthesised. A scanning electron microscope and a high-resolution transmission electron microscope showed that flower-like Ni(OH)2 and NiO with good dispersity had an average diameter of ca. 5 m and were composed of leaf-like building blocks. The Brunauer Emmett Teller results showed that flower-like Ni(OH)2 and NiO possessed high surface areas. Adsorption of congo red (CR) onto the as-prepared samples from aqueous solutions was investigated and discussed. The equilibrium adsorption data of CR on the as-prepared samples were analysed by Langmuir models, suggesting that the Langmuir model provides a better correlation of the experimental data. The adsorption capacities for removal of CR were determined by using the Langmuir equation and found to be 636.9 and 303 mg/g for flower-like Ni(OH)2 and NiO, respectively. The as-prepared flower-like Ni(OH)2 and NiO showed excellent adsorption capacities for CR pollutant from wastewater because of their hierarchical flower-like structures and high specific surface areas.

Published in:

Micro & Nano Letters, IET  (Volume:7 ,  Issue: 6 )