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首页> 外文期刊>Environmental Science & Technology >Influence of Addition Order and Contact Time on Thorium(IV) Retention by Hematite in the Presence of Humic Acids
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Influence of Addition Order and Contact Time on Thorium(IV) Retention by Hematite in the Presence of Humic Acids

机译：腐殖酸存在下添加顺序和接触时间对赤铁矿保留Thor（IV）的影响

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摘要

The influence of addition order and contact time in the system hematite (α-Fe{sub}2O{sub}3)-humic acid (HA)-thorium(IV) (Th(IV)) was studied in batch experiments. Th(IV) is considered here as a chemical analogue of other actinides (IV). The sorption isotherms were acquired varying pH in the range 2-10 and HA concentration in the range 1-100 mg/L As already observed by numerous authors, Th(IV) retention was hindered when HA and hematite were equilibrated beforehand during 24 h. As it has been observed in a previous study, this effect was drastic when the ratio between humic and surface (iron oxide) sites exceeds a critical value. However, when HA was added after a 24-h equilibration of the hematite-Th(IV) system, Th(IV) was barely desorbed from the iron oxide surface. Furthermore, no drastic effect of the ratio between humic and surface sites could be evidenced, as the increase of HA concentration only results in a slight monotonic decrease in Th(IV) retention. Increasing contact time between components of the systems only indicated slight Th(IV) retention variation, This was interpreted as a consequence of slow kinetic controls of both the Th(IV)-HA complexation and HA-hematite sorption.
机译：通过批处理实验研究了添加顺序和接触时间对赤铁矿（α-Fe{sub} 2O {sub} 3）-腐殖酸（HA）-or（IV）（Th（IV））体系的影响。 Th（IV）在这里被视为其他act系元素（IV）的化学类似物。吸附等温线是在2-10范围内的pH值和1-100 mg / L范围内的HA浓度范围内获得的。正如许多作者已经观察到的，当预先在24小时内平衡HA和赤铁矿时，Th（IV）的保留受到阻碍。如先前的研究中所观察到的，当腐殖质和表面（氧化铁）位点之间的比率超过临界值时，这种影响非常严重。但是，在赤铁矿-Th（IV）系统平衡24小时后添加HA时，Th（IV）几乎不会从氧化铁表面解吸。此外，没有证据表明腐殖质和表面部位之间的比例有剧烈影响，因为HA浓度的增加只会导致Th（IV）保留量略微单调降低。系统各组成部分之间的接触时间增加，仅表明Th（IV）保留有轻微变化，这被解释为Th（IV）-HA络合和HA-赤铁矿吸附的动力学控制缓慢的结果。

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