电化学沉积法制备氢氧化镁晶体的影响因素研究

Study on Influencing Factors of Preparing Magnesium Hydroxide Crystals by Electrochemical Deposition

以MgCl2溶液作为电解质,利用电化学沉积方法制备了Mg(OH)2晶体.研究了电流密度、MgCl2浓度、沉积时间等因素对沉积产物生长速率、结晶度、微观形貌和孔径分布的影响.结果表明:上述各因素均不影响沉积产物(Mg(OH)2)的物相组成;电流密度的增大加快了Mg(OH)2的生长速率,但同时降低了Mg(OH)2晶体的结晶度,增大了产物中的孔隙率与大孔体积;MgCl2浓度对Mg(OH)2结晶度及晶体颗粒大小的影响较小,存在使Mg(OH)2生长速率达到最大值的最佳MgCl2浓度;Mg(OH)2质量随沉积时间增加呈线性增长,生长速率基本维持恒定.

Magnesium hydroxide crystals were prepared by electrochemical deposition using magnesium chloride solution as electrolyte.The effects of current density,magnesium chloride concentration and deposition time on the growth rate,crystallinity,morphology and pore size distribution of the deposited product were investigated.The results show that each factor does not affect the phase composition of the deposited product(Mg(OH)2).The increase of current density accelerates the growth rate of Mg(OH)2,but at the same time reduces the crystallinity of Mg(OH)2 crystal,increases the porosity and macropore volume of deposition products.The MgCl2 concentration has little effect on the crystallinity and crystal particle size of Mg(OH)2,and the optimal MgCl2 concentration is present to maximize the deposition rate.The mass of Mg(OH)2 increases linearly with time,and the growth rate remains basically constant.