A novel approach for rice straw agricultural waste utilization: Synthesis of solid aluminosilicate matrices for cesium immobilization

A new approach to the use of rice straw as a difficult-to-recycle agricultural waste was proposed. Potassium aluminosilicate was obtained by spark plasma sintering as an effective material for subsequent immobilization of 137Cs into a solid-state matrix. The sorption properties of potassium aluminosilicate to 137Cs from aqueous solutions were studied. The effect of the synthesis temperature on the phase composition, microstructure, and rate of cesium leaching from samples obtained at 800-1000 degrees C and a pressure of 25 MPa was investigated. It was shown that the positive dynamics of compaction was characteristic of glass ceramics throughout the sintering. Glass ceramics RS-(K,Cs)AlSi3O8 obtained by the SPS method at 1000 degrees C for 5 min was characterized by a high density of -2.62 g/cm3, Vickers hardness - 2.1 GPa, compressive strength -231.3 MPa and the rate of cesium ions leaching of -1.37 x 10-7 g cm-2$day-1. The proposed approach makes it possible to safe dispose of rice straw and reduce emissions into the atmosphere of microdisperse amorphous silica, which is formed during its combustion and causes respiratory diseases, including cancer. In addition, the obtained is perspective to solve the problem of recycling long-lived 137Cs radionuclides formed during the operation of nuclear power plants into solid-state matrices.(c) 2022 Korean Nuclear Society, Published by Elsevier Korea LLC. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

A new method of utilizing rice straw as a difficult-to-recycle agricultural waste was proposed. Potassium aluminosilicate was obtained through spark plasma sintering and used to immobilize 137Cs into a solid-state matrix. The sorption properties of potassium aluminosilicate for 137Cs were investigated, and the effect of synthesis temperature on the phase composition, microstructure, and leaching rate of cesium ions was studied. The proposed approach allows for safe disposal of rice straw and addresses the issue of recycling long-lived 137Cs radionuclides from nuclear power plant operations into solid-state matrices.