Effects of EDTA and Bicarbonate on U(VI) Reduction by Reduced Nontronite

Widespread Fe-bearing clay minerals are potential materials capable of reducing and immobilizing U(VI). However, the kinetics of this process and the impact of environmental factors remain unclear. Herein, we investigated U(VI) reduction by chemically reduced nontronite (rNAu-2) in the presence of EDTA and bicarbonate. U(VI) was completely reduced within 192 h by rNAu-2 alone, and higher Fe(II) in rNAu-2 resulted in a higher U(VI) reduction rate. However, the presence of EDTA and NaHCO