辽宁工程技术大学学报（自然科学版）2012，Vol.31Issue(4)：516-521,6.
钙基蒙脱石对氟离子吸附及解吸实验
Experimental study on fluoride adsorption and desorption by Ca-montmorillonite
摘要
Abstract
It is generally believed that fluorine as exchangeable form in clay plays an important role during its transportation in nature environment. It can be extracted using 1M MgCL2, however, the extraction effectiveness is not verified. In this study, a fluoride adsorption on Ca-montmorillonite was conducted with various initial pH and fluoride concentrations. The results show that fluoride ion adsorption on Ca-montmorillonite decreases with the increase of initial pH, while it increases with the increase of initial fluoride concentrations. In addition, the desorption efficiency for fluoride adsorbed by Ca-montmorillonite ranges from 0 to 30% with 1M MgCl2 to extract so-called exchangeable fluorine in clay. It is concluded that fluoride ions exchange -OH2 of montmorillonite at low initial fluoride concentrations (<20 mg/L). As the initial fluoride concentration increases, the fluoride in solutions could be exchanged with surface-active OH and bounded with Al in Ca-montmorillonite to form a quasi-cryolite structure. At initial fluoride concentration higher than 100 mg/L, fluoride ions are combined with Ca in the interlayer of Ca-montmorillonite. As a result, fluoride has the lowest desorption efficiency at medium initial fluoride concentrations when extracted by 1M MgCh2关键词
粘土矿物/钙基蒙脱石/连续提取/氟/吸附/解吸/pH/初始质量浓度Key words
clay mineral/ Ca-montmorillonite/ continuous extraction/ fluoride/ adsorption/ desorption/ pH/ initial concentration分类
资源环境引用本文复制引用
楼明君,顾尚义,李金娟..钙基蒙脱石对氟离子吸附及解吸实验[J].辽宁工程技术大学学报（自然科学版）,2012,31(4):516-521,6.基金项目
煤炭资源与安全开采国家重点实验室资助项目(SKLCRSM10KFA03),贵州省教育厅重点资助项目(黔教高发[2009]331号) （SKLCRSM10KFA03）
