Hydrothermal synthesis of pollucite with soil and incineration ash for Cs immobilization and its immobilizing mechanism and leaching property
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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.
KeywordsHydrothermal 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.
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Conflict of interest
We declare no conflict of interest in this study.
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