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Preparation of C30 concrete and its adsorption performance for Cs(I).

Authors :: Yang, Gang
Wang, Yanhui
Yang, Xueying
Pan, Yuelong
Liu, Yu
Cheng, Jianfeng
Jiang, Qiao
Tuo, Xianguo
Source :: Journal of Radioanalytical & Nuclear Chemistry; May2022, Vol. 331 Issue 5, p2135-2145, 11p, 1 Black and White Photograph, 5 Charts, 9 Graphs
Publication Year :: 2022
Abstract: The preparation of C<subscript>30</subscript> concrete for a cavernous waste repository under construction in China and its Cs(I) adsorption performance were investigated. The mix ratio of C<subscript>30</subscript> concrete was cement:sand:gravel:water = 1:1.87:3.05:0.55. Three characterization analyses showed that C<subscript>30</subscript> concrete has a good crystal structure, a large specific surface area and the presence of many –OH, HCO<subscript>3</subscript><superscript>−</superscript>, CO<subscript>3</subscript><superscript>2−</superscript>, SiO<subscript>4</subscript><superscript>2−</superscript> groups and other groups. Adsorption experiments showed that the adsorption equilibrium was reached within 4 h, and pH had little effect on adsorption; several ions (K<superscript>+</superscript>, Ca<superscript>2+</superscript>, Mg<superscript>2+</superscript>, Cl<superscript>−</superscript>, NO<subscript>3</subscript><superscript>−</superscript>, and SO<subscript>4</subscript><superscript>2−</superscript>) inhibited adsorption. The adsorption was more in line with the pseudo-second-order kinetic model and the Langmuir isothermal model. Thermodynamic analysis indicates that adsorption is endothermic and stochastic. [ABSTRACT FROM AUTHOR]