Mahmoud Mamdoh R, Seliman Ayman F
Nuclear Chemistry Department, Hot Laboratories Center, Atomic Energy Authority, P.O. Box 13759, Inshas, Cairo, Egypt.
Department of Analytical Chemistry and Environmental Control, Hot Laboratories Center, Atomic Energy Authority, P.O. Box 13759, Inshas, Cairo, Egypt.
Appl Radiat Isot. 2014 Sep;91:141-54. doi: 10.1016/j.apradiso.2014.05.021. Epub 2014 Jun 2.
A novel mesoporous silica-coated ferrocyanide (MSCFC) composite was successfully synthesized and evaluated as a dual-function material for simultaneous removal of (137)Cs(+) cations and (99)TcO4(-) anions from aqueous solutions. Sorption behavior of both radionuclides on MSCFC under different experimental conditions has been studied using a batch technique. Results revealed that about 100% of (137)Cs(+) and 97% of (99)TcO4(-) were removed by MSCFC in the pH ranges of 2.2-12.4 and 4.1-9.5, respectively. Sorption kinetic data were analyzed by pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models, while Langmuir and Freundlich models were applied for the sorption isotherms. The maximum sorption capacity of MSCFC for radiocesium was determined and compared with other reported sorbents. Applicability of the coated ferrocyanide for simultaneous removal of (137)Cs(+) and (99)TcO4(-) from low-level liquid radioactive waste (LLLW) was also tested, and the data revealed that 99.91% and 98.34% were removed from (137)Cs(+) and (99)TcO4(-), respectively. It is concluded that MSCFC exhibits excellent efficiency for simultaneous removal of the mixed radionuclides with different charge from LLLW.
成功合成了一种新型介孔二氧化硅包覆亚铁氰化物（MSCFC）复合材料，并将其作为一种双功能材料进行评估，用于同时从水溶液中去除¹³⁷Cs⁺阳离子和⁹⁹TcO₄⁻阴离子。采用分批技术研究了两种放射性核素在不同实验条件下在MSCFC上的吸附行为。结果表明，在pH值范围为2.2 - 12.4和4.1 - 9.5时，MSCFC分别去除了约100%的¹³⁷Cs⁺和97%的⁹⁹TcO₄⁻。吸附动力学数据通过准一级、准二级和颗粒内扩散动力学模型进行分析，而Langmuir和Freundlich模型则用于吸附等温线。测定了MSCFC对放射性铯的最大吸附容量，并与其他报道的吸附剂进行了比较。还测试了包覆亚铁氰化物用于从低放液体放射性废物（LLLW）中同时去除¹³⁷Cs⁺和⁹⁹TcO₄⁻的适用性，数据显示分别从¹³⁷Cs⁺和⁹⁹TcO₄⁻中去除了99.91%和98.34%。得出的结论是，MSCFC在从LLLW中同时去除具有不同电荷的混合放射性核素方面表现出优异的效率。
