Work Environment Research Group, National Institute of Occupational Safety and Health, Kawasaki, Kanagawa.
Ind Health. 2010;48(4):427-37. doi: 10.2486/indhealth.ms1041.
In occupational hygiene, activated carbon produced from coconut shell is a common adsorbent material for harmful substances including organic vapors due to its outstanding adsorption capacity and cost advantage. However, moisture adsorption of the carbon generally decreases the adsorption capacity for organic vapors. In a previous report, we prepared several coconut shell activated carbons which had been preconditioned by equilibration with moisture at different relative humidities and measured the breakthrough times for 6 kinds of organic vapor, in order to clarify the effect of preliminary moisture content in activated carbon on the adsorption capacity in detail. We found that the relative percent weight increase due to moisture adsorption of the carbon specimen had a quantitative effect, reducing the breakthrough time. In this report, we carried out further measurements of the effect of moisture content on the adsorption of 13 kinds of organic vapor, and investigated the relationship between moisture adsorption and the reduction of the breakthrough time of activated carbon specimens. We also applied the data to the Wood's breakthrough time estimation model which is an extension of the Wheeler-Jonas equation.
在职业卫生学中，椰壳活性炭由于其出色的吸附能力和成本优势，是一种常见的吸附剂材料，可用于吸附包括有机蒸气在内的有害物质。然而，碳的水分吸附通常会降低其对有机蒸气的吸附能力。在之前的报告中，我们制备了几种经过不同相对湿度下的水分平衡预处理的椰壳活性炭，并测量了 6 种有机蒸气的穿透时间，以详细阐明活性炭中初始水分含量对吸附能力的影响。我们发现，由于碳样品的水分吸附导致的相对重量增加具有定量影响，会缩短穿透时间。在本报告中，我们对水分含量对 13 种有机蒸气吸附的影响进行了进一步的测量，并研究了水分吸附与活性炭样品穿透时间缩短之间的关系。我们还将这些数据应用于 Wood 的穿透时间估算模型，这是 Wheeler-Jonas 方程的扩展。
