摘要
利用阴离子交换膜电解方法制备了La(OH)3。研究了电极材料、电流密度、反应介质对La(OH)3的影响。使用不锈钢材料作阴极,在电流密度低于300 A.m-2时,La(OH)3质量随电解时间线性增大。较佳工艺条件为:电流密度300 A.m-2,LaCl3浓度为0.2 mol.L-1,添加剂浓度为15%。循环伏安曲线表明,电解过程中不锈钢表面氧化膜和H+的还原均有一个电流阶跃,两个阶跃间有一个相对平缓的电流区域。相同电压时,无添加剂的0.2 mol.L-1LaCl3溶液电流最大,含15%添加剂时的电流下降,0.6 mol.L-1NaCl空白溶液的电流最小。La(OH)3的生成使析氢电位正移。
The preparation of La（OH）3 was performed by ion-exchange membrane electrolysis. The influences of electrode materials, reaction media, LaCl3 concentration and current density on the production speed of La（OH ）3 were studied experimentally. The weight of La（OH）3 increases linearly with the operation time at the constant current density on stainless steel as cathode. The appropriate technological parameters were as follows： current density was 300 A·m^-2, concentration of LaCl3 was 0.2 mol· L^-1 and concentration of reagent was 15%. The cyclic vohammetry demonstrated that both of the oxide layer on stainless steel surface and H^＋ are reduced, and each of them caused a sharply increment of current, between both peaks on even plateau was observed. Under a constant voltage, the current of the solution which contains only 0.2 mol· L^-1 LaCl3 was the largest, and it decreased with 15% additive, the current of 0.6 mol·L^-1 NaCl blank solution was the least. The formation of La （OH）3 caused positive shift of potential of H2 deposition.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2007年第3期331-335,共5页
Chinese Journal of Rare Metals
基金
哈尔滨工业大学(威海)资助项目(IMJQ10000025)
关键词
离子膜
电解
氢氧化镧
循环伏安
ion-exchange membrane
electrolysis
lanthanum hydroxide
cyclic voltammetry
作者简介
魏琦峰（1963-），男，山西人，博士，副教授；研究方向：粉体材料合成与应用通讯联系人（E-mail：weiqifeng163@163．com）
