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Tartrate-Induced Self-Assembly of Highly Positively Charged Three-Dimensional Spiral Cd(OH)2 Flowers with Largely Exposed (001) Plane

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posted on 2016-02-19, 19:29 authored by Han-Qiao Shi, Yu Liu, Hong-Mei Xiao, Shao-Yun Fu
Novel three-dimensional (3D) spiral flowerlike Cd­(OH)2 structures were prepared for the first time through a tartrate-induced hydrothermal self-assembly route. Scanning electron microscopy observation showed that the nanopetals were assembled in the way of spiraling sequential overlap on the side edge of early nanopetals to gradually form the 3D spiral flowerlike Cd­(OH)2 structures. Time-dependent experiments with appropriate intervals have clearly disclosed that the self-assembly process of 3D spiral Cd­(OH)2 flowers is governed by a nucleation–dissolution–recrystallization growth mechanism. The self-assembled 3D spiral Cd­(OH)2 flowers are highly positively charged and possess superior adsorption and separation performance over other two morphological structures of hollow spheres and sub-microsized plates reported previously. The largely preferential exposure of the (001) plane with the highest surface charge density is the dominant cause for the excellent adsorption and separation performance.

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