Lungu C, Underhill D
School of Public Health, University of Minnesota, Minneapolis 55455, USA.
Health Phys. 1999 Sep;77(3):298-302. doi: 10.1097/00004032-199909000-00008.
The following procedure was used to determine the effect of moisture on the adsorption of xenon from air onto activated carbon: A known amount of water is added to a sample of dried activated carbon and allowed to equilibrate. This activated carbon is then split between two cylindrical beds placed in a temperature controlled water bath, and air is passed through the beds sequentially. Because the beds contain pre-moistened activated carbon from the same sample, the first bed acts as a buffer, maintaining a constant humidity in the second. The mean holdup time of a pulse of 133Xe injected into the second bed is used to determine the adsorption coefficient for xenon under these conditions. Measurements were made for three carbons activated to 35, 40, and 59%, respectively, at temperatures of 25 degrees C and 55 degrees C. The effect of moisture on the same activated carbon at these two temperatures shows an affine relationship that could be helpful in extending these results to other temperatures. At low moisture uptakes, a plot of the log(adsorption coefficient) vs. moisture uptake gives a straight line.
向干燥的活性炭样品中加入已知量的水并使其达到平衡。然后将这种活性炭分装到放置在温度可控的水浴中的两个圆柱形床层中，空气依次通过这些床层。由于这些床层含有来自同一样品的预湿活性炭，第一个床层起到缓冲作用，在第二个床层中保持恒定的湿度。注入第二个床层的133Xe脉冲的平均滞留时间用于确定在这些条件下氙的吸附系数。分别在25℃和55℃的温度下，对三种分别活化至35%、40%和59%的活性炭进行了测量。在这两个温度下，水分对同一种活性炭的影响呈现出一种仿射关系，这可能有助于将这些结果推广到其他温度。在低水分吸收情况下，log(吸附系数)对水分吸收的曲线图呈直线。
