Uptake of benzenecarboxylate ions by magnesium aluminium oxides
Uptake of benzenecarboxylate ions by magnesium aluminium oxides
复制标题
镁铝氧化物吸收苯甲酸根离子
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
A. Okuwaki
中科院分区：
文献类型：
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作者：
Tsugio Sato;K. Kato;T. Yoshioka;A. Okuwaki
在0.70℃条件下，研究了岩盐型镁铝氧化物Mg(1-x)(2+x)Al2x/(2+x)O （x = 0.17, 0.30, 0.33）对苯羧酸盐离子C6H6-n(COO)nn （n = 1-6）的吸附行为。所有的苯羧酸离子都与OH-竞争性地从溶液中吸附，形成类水滑石的层状双氢氧化物。表面化学反应控制的缩核模型可以很好地描述吸收速率，表观活化能为0.60 kJ mol−1。随着苯甲酸盐离子电荷密度的增加，负离子吸收的选择性增加。随着镁铝氧化物中铝含量的增加，水滑石中间层中苯羧酸盐离子的掺入量和对电变化较大的苯羧酸盐的吸收选择性增加。
The behaviour of uptake of the benzenecarboxylate ions, C6H6-n(COO)nn (n = 1–6), in aqueous solutions by rock-salt type magnesium aluminium oxide, Mg(1-x)(2+x)Al2x/(2+x)O (x = 0.17, 0.30, 0.33) was investigated at 0.70°C. All the benzenecarboxylate ions were taken up from solution competitively with OH- to form the hydrotalcite-like layered double hydroxides. The uptake rate could be adequately described by a surface chemical reaction controlled shrinking core model, and the apparent activation energy was c. 60 kJ mol−1. The selectivity of anion uptake increased with increasing the charge density of the benzenecarboxylate ions. The amount of benzenecarboxylate ions incorporated in the interlayer of hydrotalcite and the selectivity of uptake for benzenecarboxylate possessing higher electric change increased with increasing aluminium content in the magnesium aluminium oxide.