Hydrothermal synthesis of pollucite with soil and incineration ash for Cs immobilization and its immobilizing mechanism and leaching property

  • Zhenzi JingEmail author
  • Jian Li
  • Wenbo Hao
  • Jiajun Miao


A hydrothermal method has been developed to convert Cs-polluted soil (kaolin) mixed with incineration ashes of plants (rice husk ash) into pollucite for the in situ immobilization of Cs. With the addition of slaked lime, a very tough tobermorite–pollucite body could further be obtained. According to extended X-ray absorption fine structure analysis, Cs did be embedded into the crystal structure of pollucite, which resulted in a perfect Cs leaching performance of the synthesized specimens. As such, the technology has a high potential to be directly applied to the in situ treatment of huge amounts of Cs-polluted soil and incineration ashes of plants.

Graphical abstract


Hydrothermal synthesis Pollucite Tobermorite Cs immobilization Soil Incineration ashes 



The present work was supported by the National Natural Science Foundation of China (Nos. 51872206, 51272180) and the National Key R&D Program of China (2017YFC 0506004). The EXAFS analysis was supported by 4W1B endstation of Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences.

Compliance with ethical standards

Conflict of interest

We declare no conflict of interest in this study.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, School of Materials Science and EngineeringTongji UniversityShanghaiChina

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