Preparation of Flake-Like Magnesium Hydroxide by Diaphragm Electrodeposition Method and Its Influence Factors

doi:10.12068/j.issn.1005-3026.2017.09.014

Abstract

Abstract: Flake-like magnesium hydroxide was prepared by the diaphragm electrodeposition method using magnesium chloride hexahydrate (MgCl₂·6H₂O) as raw material. The effects of processing parameters， such as the concentration of Mg²⁺， reaction temperature and the electric current density，on the morphology and particle size of magnesium hydroxide were investigated. The morphology and particle size of the produced magnesium hydroxide (Mg(OH)₂) particles were characterized by scanning electron microscopy (SEM) and laser particles distribution instrument， respectively. The results indicate that the products from this method have higher rate of settlement and easily segregates. When the initial concentration of Mg²⁺ increases， the particle size increases and the flaky morphology is bigger and thicker. With the increasing reaction temperature， the flaky morphology defects become greater and particle agglomeration is more serious， while the particle size decreases firstly and then increases. As the current density increases， the particle size decreases. Meanwhile， the flake features are degraded and eventually dendritic morphology appears. The specific surface area of these samples can be detected by the brunauer emmett teller (BET) method with a maximum value of 82.36m²/g and its adsorption capacity of methyl violet (MV) can reach 1256mg/g.

Key words: magnesium hydroxide, flake-like, diaphragm, electrodeposition, morphology

CLC Number:

TQ132. 2

DENG Xin-zhong， DI Yue-zhong， WANG Yao-wu， FENG Nai-xiang. Preparation of Flake-Like Magnesium Hydroxide by Diaphragm Electrodeposition Method and Its Influence Factors[J]. Journal of Northeastern University Natural Science, 2017, 38(9): 1280-1284.

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