排序方式: 共有3条查询结果,搜索用时 0 毫秒
1
1.
In this study, a new type of Aliquat 336/PVC membrane has been made for extraction experiments. This new membrane is capable
of holding more Aliquat 336 than previously developed extraction membranes, hence overcoming a major problem that has confronted
many researchers for a long time. The new membrane has been used to investigate the rate of extraction for the Cd(II) ion
in 2.0 M HCl solution and the effect of membrane thickness on the rate of extraction. The experimental results have shown
this new membrane has a promising future in relevant industrial applications. A new method is also used in this study to qualitatively
identify the oily substance on the surface of membrane after the extraction experiment was completed. This oily substance
has been found to be Aliquat 336. 相似文献
2.
This work presents a series of experimental tests on new practical approaches in membrane design to improve extraction capacity
and rate. We chose an extraction system involving Aliquat 336 as the extractant and Cd(II) as the metal ion to be extracted
to demonstrate these new approaches. The core element in the new membrane assembly was the extractant loaded sintered glass
filter. This membrane assembly provided a large interface area between the extractant and the aqueous solution containing
metal ions. By recycling the aqueous solution through the membrane assembly, the extraction rate was significantly improved.
The membrane assembly also offered good extraction capacity. 相似文献
3.
A major concern in solvent extraction processes is the loss of extractant into the aqueous phase due to its slight solubility
in the aqueous phase. Similarly, in membrane extraction processes, extractant loss through extractant leakage from the membrane
into the aqueous phase is also a concern. Several published membrane extraction studies using Aliquat 336 as the extractant,
have expressed this concern, but none has studied extractant leakage quantitatively. It is the authors’ opinion that the extractant
leakage should be considered as a technical parameter of a membrane. In our laboratory active progress has been made in using
Aliquat 336 ‘entangled’ into the polymer membranes to remove heavy metal ions from wastewater samples. In this work, we studied
the loss of Aliquat 336 from the point of view of its solubility in aqueous solutions. The results showed that the solubilities
of Aliquat 336 in an aqueous phase acidified with 2 M HCl is about 0.1 g/100 m/ of the solution. This figure provides a useful
guideline for evaluating the leakage of the Aliquat 336 extractant from the membranes. 相似文献
1