摘要
在高湿环境下去除放射性气态碘时,较高的湿度会对活性炭吸附碘效率产生严重影响。以聚二乙烯基苯(PDVB)为疏水改性剂,采用简单的液相浸渍法对不同种类的活性炭进行疏水改性。通过表征活性炭孔隙结构、表面疏水性能和碘吸附法探究了其在高湿环境下对气态碘的吸附性能和改性机理。结果表明:PDVB本身具有多孔结构且疏水性优异,浸渍改性后,PDVB多孔纳米粒子可以进入材料孔隙结构中改善活性炭的多孔结构性能,增强比表面积和微孔容积,进而有效提升材料对碘的吸附容量。此外,在相对湿度(RH)为96%的高湿度环境进行碘吸附性能测试,由于PDVB疏水改性后疏水性增强,减弱了对水分子的亲和力,降低了水分子竞争吸附的影响,使得其在高湿环境下也具有较好的适用性。还发现该改性方法对其他无机多孔材料的疏水改性也有应用潜力。
The relatively higher humidity has a significant impact on the adsorption efficiency when activated carbon is used to remove radioactive gaseous iodine.In this paper,different types of activated carbon were hydrophobically modified by a simple liquid phase impregnation method using poly(divinylbenzene)(PDVB)as a hydrophobic modifier.The pore structure,surface hydrophobic properties and iodine adsorption tests of activated carbon were used to investigate the adsorption performance and modification mechanism of gaseous iodine in high humidity environment.The results show that PDVB has a porous structure and excellent hydrophobicity,and after modification by impregnation,PDVB porous nanoparticles can enter the pore structure of the material to improve the porous structure of the activated carbon,enhance the specific surface area and microporous volume,and then effectively increase the adsorption capacity of the material for iodine.In addition,the iodine adsorption performance was tested in a high humidity environment at 96%RH.The hydrophobic modification of PDVB resulted in increasing hydrophobicity,reducing affinity for water molecules and reducing the effect of competing adsorption of water molecules,and made it suitable for use in high humidity environments.The modification method was also found to have potential for the hydrophobic modification of other inorganic porous materials.
作者
唐增明
谢东
李苏哲
杨晓敏
TANG Zengming;XIE Dong;LI Suzhe;YANG Xiaomin(School of Resources,Environment and Safety Engineering,University of South China,Hengyang,Hunan 421001,China;National&Local Joint Engineering Research Center for Airborne Pollutants Control and Radioactivity Protection in Buildings,University of South China,Hengyang,Hunan 421001,China;School of Civil Engineering,University of South China,Hengyang,Hunan 421001,China)
出处
《世界核地质科学》
CAS
2023年第S01期673-679,共7页
World Nuclear Geoscience
基金
中国国家原子能机构乏燃料后处理专项(编号:科工二司[2020]441号)资助。
关键词
活性炭
气态碘吸附
PDVB疏水改性
高湿环境
activated carbon
gaseous iodine adsorption
PDVB hydrophobic modification
high humidity
