期刊论文

Liquid Nitrogen Modification Method for Improving Radon Adsorption Efficiency of Activated Carbon

Xiao, Detao(13307478601@189.cn)

中文

原子能科学技术

1000-6931

2021

55

2

377-384

10.7538/yzk.2020.youxian.0179

国家自然科学基金资助项目（11875165）；

本校为第一机构

优质椰壳活性炭被广泛用作氡、碘等气载放射性的吸附材料。为提高其吸氡能力,本文采用液氮浸泡、液氮浸泡与蒸发并行和低温氮气冲洗的活性炭改性方法,分别对优质椰壳活性炭进行了改性研究,并改进了静态法测量材料对氡的吸附系数的计算方法。结果表明,连续液氮浸泡与蒸发对活性炭改性的效果最好,改性活性炭对氡的吸附系数随连续液氮浸泡与蒸发次数的增加呈先增大后减小的规律,连续改性4次的改性效果最佳,改性活性炭的吸附系数提高了36%;液氮浸泡对活性炭改性也有一定效果,改性活性炭对氡的吸附系数最大可提高15%;低温氮气冲洗对活性炭改性没有效果。活性炭改性前后样品的BET表征结果表明,改性活性...

Coconut shell activated carbon is widely used as adsorption material for radon, iodine and other radioactive gas. In order to improve the adsorption efficiency of coconut shell activated carbon to radon, coconut shell activated carbon was modificated by liquid nitrogen immersion, simultaneous liquid nitrogen immersion and evaporation and low temperature nitrogen washing. The results show that the modification method of simultaneous liquid nitrogen immersion and evaporation is the best, the adsorption coefficient of modificated activated carbon ...