Iodine

About: Iodine is a research topic. Over the lifetime, 8936 publications have been published within this topic receiving 139981 citations. The topic is also known as: I & element 53.

Use of activated carbon fiber for direct removal of iodine from acetic acid solution

Abstract: Activated carbon fiber was used as a new adsorbent for direct removal of iodine and iodide compounds from acetic acid solutions under static and dynamic conditions. In aqueous solution as well as in acetic acid, methanol, or ethanol, activated carbon fiber showed excellent iodine removal efficiency, superior to that of activated carbon, silica gel, alumina, NaY zeolite, Ag ion-exchanged NaY, and Ag ion-erchanged Amberlyst XN 1010. Water was a promoter for the removal of iodine on activated carbon fiber. The amount of iodine removed followed the reverse order of solubility of iodine in the solution. Activated carbon fiber could be used as an iodine removal adsorbent without significant change in the removal efficiency over a wide range of iodine concentration and contact time. The activated carbon fiber used was completely regenerated by He flushing above 200°C. In addition to the excellent iodine removal characteristics, activated carbon fiber showed a good performance in the removal of iodide compounds such as hydrogen iodide

Uptake Mechanism for Iodine Species to Black Carbon

Abstract: Natural organic matter (NOM) plays an important role in determining the fate and transport of iodine species such as iodide (I–) and iodate (IO3–) in groundwater system. Although NOM exists as diverse forms in environments, prior iodine studies have mainly focused on uptake processes of iodide and iodate to humic materials. This study was conducted to determine the iodide and iodate uptake potential for a particulate NOM (i.e., black carbon [BC]). A laboratory-produced BC and commercial humic acid were used for batch experiments to compare their iodine uptake properties. The BC exhibited >100 times greater uptake capability for iodide than iodate at low pH of ∼3, while iodide uptake was negligible for the humic acid. The uptake properties of both solids strongly depend on the initial iodine aqueous concentrations. After uptake reaction of iodide to the BC, X-ray absorption fine structure spectroscopy results indicated that the iodide was converted to electrophilic species, and iodine was covalently bound ...

Dynamic study of post-natal thyroid function in the rat.

Abstract: The thyroid function in development was investigated in post-natal rats. The thyroid iodine content rapidly increased from birth (137 +/- 26 ng iodine/mg thyroid) up to day 10 (338 +/- 42 ng iodine/mg thyroid) then increased more slowly up to day 30 (425 +/- 34 ng iodine/mg thyroid). The maximal plasma concentration of thyroxine was observed on day 16 (56.9 +/- 3.5 ng T4/ml) and of iodide on day 10 (110.2 +/- 12.6 ng I-/ml). The turnover rate constant of extrathyroidal thyroxine was higher at birth (8.0 +/- 2.3 %/h) than at any older age studied (average 6 %/h). Thyroxine secretion by the thyroid was more intense before weaning (37 ng hormonal iodine/h/100 g body weight on days 10 and 20) than after weaning (22 +/- 6 ng hormonal iodine/h/100 g body weight in 30 days old rats). The peripheral deiodination rate of thyroxine represented about 90 % thyroxine secretion rate in newborn and 10 days old rats and only 40% in adult females. In pre-weaning rats, after a single injection of both [131I]L-T4 and [125I]Na, extrathyroidal radioactivity disappeared more slowly than in 30 days old rats and adult animals. This suggests that iodide concentrations of extrathyroidal tissues are higher before than after weaning.