Ion exchangers in radioactive waste management. Part XI. Removal of barium and strontium ions from aqueous solutions by hydrous ferric oxide
Ion exchangers in radioactive waste management. Part XI. Removal of barium and strontium ions from aqueous solutions by hydrous ferric oxide
复制标题
DOI：
10.1016/s0969-8043(99)00065-2
复制
发表时间：
1999-10-01
影响因子：
1.6
通讯作者：
Tiwary, D
中科院分区：
文献类型：
--
作者：
Mishra, SP;Tiwary, D
采用“放射性示踪技术”研究了水合氧化铁（HFO）对Ba（II）和Sr（II）的吸附与接触时间、浓度、温度和pH的关系。两种离子的吸收量随吸附溶液浓度、温度和pH值的增加而增加。浓度依赖性数据在整个浓度范围(10（-2)-10(-7)M）内符合Freundlich吸附等温线，吸附过程符合一级速率动力学。解吸实验证明了吸附过程的不可逆性质，然而，在H+离子存在的情况下，即在酸化过程中，大量的金属离子在体溶液中被去除。在作为吸附剂之前，用中子和伽马射线照射的水合氧化铁样品，考察了水合氧化铁对Ba（II）和Sr（II）吸收的辐射稳定性。一些单价和二价共价离子的存在与所研究的离子一起明显抑制了它们的去除。1999爱思唯尔科学有限公司版权所有。
The uptake of Ba(II) and Sr(II) by hydrous ferric oxide (HFO) was studied as a function of contact time, concentration, temperature and pH of the respective adsorptive solutions employing the 'radiotracer technique'. The uptake of both the ions was found to increase with the increase in concentration, temperature and pH of the adsorptive solutions. Concentration dependence data fitted well to the Freundlich adsorption isotherm over the entire range of concentration (10(-2)-10(-7) M) and the uptake process followed first-order rate kinetics. The desorption experiments demonstrate the irreversible nature of the uptake process, however, in the presence of H+ ions, i.e. on acidification, an appreciable amount of metal ions were removed in the bulk solution. The radiation stability of hydrous ferric oxide towards the uptake of Ba(II) and Sr(II) was also examined by using samples of hydrous ferric oxide irradiated by neutrons and gamma-rays prior to be employing as sorbents. The presence of some mono- and divalent co-ions along with the studied ions suppressed their removal appreciably. (C) 1999 Elsevier Science Ltd. All rights reserved.