摘要
研究了NH4+型斜发沸石对盐水中钾离子的吸附行为,考察了竞争阳离子等对铵型斜发沸石吸附钾离子的影响。结果表明,NH4+型斜发沸石对钾离子具有较强的选择吸附性与较大的饱和吸附容量,受钾离子初始浓度的影响,NH4+型斜发沸石吸附钾离子的行为在沸石相K+平衡分数YK+为0.5时发生较大转折。竞争阳离子的存在在不同程度上抑制了铵型斜发沸石对钾离子的吸附,特别是钾离子与钠离子的相对比例直接影响NH4+型斜发沸石对混合液中钾离子的选择交换能力。
The adsorption behavior of NH4^＋-pretreated clinoptilolite for potassium ions was studied. The effects of competing cations were investigated. The results indicate that NH4^＋-pretreated clinoptilolite adsorbed potassium ions with high adsorption capacity. The adsorption behavior of the NH4^＋-pretreated clinoptilolite deviated from the original trend at the equivalent fraction of K^＋ in the clinoptilolite Yk = 0. 5 due to the effect of potassium concentration. The presence of competing cations, mainly sodium ions, surpressed the exchange capacity for potassium, in particular the ratio of potassium ions to sodium ions directly influenced the selectivity of potassium on the NH4^＋-pretreated clinoptilolite.
出处
《应用化学》
CAS
CSCD
北大核心
2005年第10期1092-1095,共4页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(29777011)资助项目
关键词
NH4^+型斜发沸石
竞争阳离子
选择吸附
吸附容量
NH4^＋-pretreated clinoptilolite, competing cations, adsorption selectivity, adsorption capacity
