Abstract
In this work, uniform polydopamine (PDA) layers by self-polymerization of dopamine were successfully coated around titanate nanotubes (TNTs) to enhance its adsorption ability. The polydopamine-functionalized titanate nanotubes (PDA-TNTs) exhibited outstanding U(VI) adsorption capacity (247.53 mg/g) and rapid adsorption efficiency. The nitrogenous groups and phenolic hydroxyl groups of PDA coordinating with UO22+ was dominant, while ion exchange between Na+/H+ and U(VI) was of secondary importance. Besides, the introduction of PDA significantly alleviated the competitive adsorption between U(VI) and coexisting metal ions, making it possible for PDA-TNTs to be an effective sorbent to remove U(VI) in radioactive wastewater.
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