核化学与放射化学2018，Vol.40Issue(3)：189-195,7.DOI:10.7538/hhx.2018.40.03.0189
高庙子膨润土胶体的基本性质
Basic Properties of Gaomiaozi Bentonite Colloids
摘要
Abstract
In the evolution of high-level radioactive waste repository,colloids will be pro-duced when groundwater contacts the bentonite which is used as the buffer and backfill mate-rial in the near field of the repository.Therefore,extraction and characterization of the ben-tonite colloids are of great importance for understanding the diffusion and migration behav-iors of key radionuclides.In this paper,Gaomiaozi bentonite and deionized water were used and boiling dispersion method was developed to extract bentonite colloids,and multiple ana-lytical techniques were used to characterize the properties of the colloids.X-ray diffraction (XRD)analysis shows that the main mineralogical composition of the colloids is montmoril-lonite,which is confirmed by high resolution transmission electron microscopy (HRTEM) information.The average equivalent circle diameter and zeta potential of the colloids are obtained as 94 nm and -45 mV respectively by dynamic light scattering(DLS),suggesting that the colloids have good stability.Atomic force microscopy(AFM)results show that the mean diameter and height of bentonite colloids are (90±27)nm and (16.6±2.6)? (1 ?=0.1 nm)respectively and the 2/3-layer hydrate exhibits the most ordered layer stacking.The average pHPZC of the bentonite colloids is around 9.9 from the results of acid-base titrations.关键词
高庙子膨润土/胶体提取/表征Key words
Gaomiaozi bentonite/colloid extraction/characterization分类
化学化工引用本文复制引用
王凯峰,林志茂,杨颛维,王春丽,王东文,刘福强,张灏,刘春立..高庙子膨润土胶体的基本性质[J].核化学与放射化学,2018,40(3):189-195,7.基金项目
高放射性废物处置特别基金资助项目(2007-840,2012-851) （2007-840,2012-851）
国家自然科学基金资助项目(NSFC No.U1530112, 11475008,11075006,91026010) （NSFC No.U1530112, 11475008,11075006,91026010）
