Use of Layered Double Oxides and Hydroxides of Mg and Al for Removing Dyes from Aqueous Solutions Containing 137Cs, 90Sr, 90Y, and U(VI)

Abstract

The possibility of removing dyes from aqueous solutions containing ¹³⁷Cs, ⁹⁰Sr, ⁹⁰Y, and U(VI) using layered double oxides (LDOs) and hydroxides (LDHs) of Mg and Al was examined. The use of LDO-Mg-Al allows rapid and efficient pretreatment of radioactive solutions containing Cs and Sr radionuclides to remove dyes for the subsequent recovery of Cs and Sr with other selective sorbents. The use of LDO-Mg-Al, LDH-Mg-Al-OH, and LDH-Mg-Al-CD (CD is β-cyclodextrin) allows simultaneous removal from aqueous solutions of UO₂(NO₃)₂ (initial concentration <10⁻² M), ⁹⁰Y (an analog of trivalent f elements), and dye (degree of removal >90%).