Particle formation and growth in dilute aluminum(III) solutions: Characterization of particle size distributions at pH 5.5
Particle formation and growth in dilute aluminum(III) solutions: Characterization of particle size distributions at pH 5.5
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DOI：
10.1016/0043-1354(84)90157-x
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发表时间：
1984
期刊：
影响因子：
12.8
通讯作者：
W. Snodgrass;M. Clark;C. R. O'melia
中科院分区：
文献类型：
--
作者：
W. Snodgrass;M. Clark;C. R. O'melia
使用电子粒子计数器研究了稀铝溶液（约 2 × 10−4M）中 1–40 μm 尺寸范围内的颗粒形成和生长。硫酸盐、黄腐酸盐和氢氧根离子加速颗粒形成的速率以及颗粒尺寸分布随时间的变化。增加离子强度（惰性电解质）会产生类似但不太显着的效果。硫酸盐和富里酸或硫酸盐和惰性电解质的组合进一步加速颗粒形成的速率。中等离子强度的氯化铝溶液在几天后就不再含有超微米颗粒。开发了一个概念途径模型，该模型表明，当将铝添加到黄腐酸溶液中时，会形成两种不同的固体：铝黄腐酸盐沉淀物和 Al(OH)2(s)。第一种固体在 pH 值~5.5 的黄腐酸溶液中占主导地位。
Particle formation and growth over the 1–40 μm size range in dilute aluminum solutions (approx. 2 × 10−4M) have been studied using an electronic particle counter. Sulfate, fulvate and hydroxide ion accelerate the rate of particle formation and changes of the particle size distribution over time. Increasing ionic strength (inert electrolyte) produces similar but less dramatic effects. Combinations of sulfate and fulvic acid or sulfate and inert electrolyte further accelerate the rate of particle formation. Aluminum chloride solutions at moderate ionic strength are devoid of supramicron particles after several days. A conceptual pathway model is developed which suggests that two different solids are formed when aluminum is added to fulvic acid solutions: an aluminum-fulvate precipitate and Al(OH)2(s). The first solid dominates in fulvic acid solutions at pH ∼5.5.