Facile Synthesis of Na<sub>2</sub>Ti<sub>6</sub>O<sub>13</sub> Nanorods by Ultrasonic Spray Pyrolysis Combined with Molten Salt Method and Their Radionuclide and Heavy Metal Sorption Capacity

One-dimensional (1D) sodium hexa-titanate (Na2Ti6O13) nanorod has garnered considerable attention as a sorbent because of its intrinsic crystal structure and a large specific surface area. This unique characteristic enables it to irreversibly immobilize and entrap a great number of hazardous radionuclides and heavy metal cations and thus ensure permanently safe disposal. Although molten salt synthesis (MSS) has attracted much attention, it faces challenges in controlling the nanoscale, one-dimensional structure of Na2Ti6O13 owing to large reactor size and long processing times, frequently leading to excessive overgrowth and reduced sorption efficacy.