Design of 3D alumina-doped magnesium oxide aerogels with a high efficiency removal of uranium(vi) from wastewater. Issue 10 (9th April 2021) - Lei, Yuqing
Abstract : 3D alumina-doped magnesium oxide (Al2 O3 /MgO) aerogels with remarkable adsorption properties for U(vi ) were prepared via a simple lyophilization–calcination method. Abstract : Herein, 3D alumina-doped magnesium oxide (Al2 O3 /MgO) aerogels were successfully prepared by a simple lyophilization–calcination method for the uranium (U(vi )) elimination from wastewater. Various batch experiments were used to testify that Al2 O3 /MgO aerogels exhibited remarkable removal performance for U(vi ), especially Al2 O3 /MgO aerogels with Al2 O3 /MgO molar ratios of 1 : 1 (Al/Mg-3). Results showed that Al/Mg-3 could quickly reach the adsorption equilibrium within the contact time of 100 min, while the adsorption capacity of Al/Mg-3 for U(vi ) could reach as high as 1046.9 mg g −1 at pH 6.0. The selectivity of Al/Mg-3 for U(vi ) proved that Al/Mg-3 could be used to remove U(vi ) from wastewater. The adsorption efficiency of Al/Mg-3 for U(vi ) could still retain more than 92.5% after five cycles. Furthermore, the continuous U(vi ) separation test results showed that the adsorption equilibrium time and adsorption efficiency of Al/Mg-3 could decrease to 40 min and increase to 99.7%, respectively. This work demonstrated that the remarkable U(vi ) removal performance of Al/Mg-3 could make it an effective and reusable material for the adsorption of U(vi ) from U(vi )-contained wastewater.