Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 435, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129022
Keywords
Uranium; Wastewater treatment; Amine-bridged diacetamide; Crystal structure; Mesoporous silica
Categories
Funding
- National Natural Science Foundation of China [21906153]
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This study successfully prepared mesoporous silica materials with high selectivity, which can effectively reduce wastewater contaminated with uranium. The experimental results showed that the material had a strong affinity for uranium under low acidic conditions and exhibited good reusability.
A major environmental concern related to nuclear energy is wastewater contaminated with uranium, thus necessitating the development of pollutant-reducing materials with efficiency and effectiveness. Herein, highly selective mesoporous silicas functionalized with amine-bridged diacetamide ligands SBA-15-ABDMA were prepared. Different spectroscopy techniques were used to probe the chemical environment and reactivity of the chelating ligands before and after sorption. The results showed that the functionalized SBA-15-ABDMA had a strong affinity for uranium at low pH (pH = 3) with desirable sorption capacity (68.82 mg/g) and good reusability (> 5). It showed excellent separation performance with a high distribution coefficient (K-d,K-U > 10(5) mL/g) and separation factors SFU/Ln > 1000 at a pH of 3.5 in the presence of lanthanide nuclides, alkaline earth metal and transition metal ions. In particular, SiO(2)spheres-ABDMA was used as a column material, which achieved excellent recovery of U(VI) (> 98%) and good reusability for samples of simulated mining and nuclear industries wastewater. XPS and crystallography studies clearly illustrated the tridentate coordination mode of U(VI)/PEABDMA and the mechanism and origin behind the high selectivity for U.
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