Polyethylenimine embellished multiwalled carbon nanotube (MWCNTs) for efficiently enhancing sequestration of uranium(Ⅵ) from seawater

作者：Liu Chang; Li Ye; Liu Shuang; Zhou Yuzhi; Li Bolin; Liu Dongxue; Fu Chengbin; Ye Lingfeng

来源：Journal of Environmental Chemical Engineering, 2022, 10(5): 108513.

DOI：10.1016/J.JECE.2022.108513

• MWCNTs
• Polyethylenimine
• Seawater
• Uranium(Ⅵ)
• Adsorption mechanism

There are abundant uranium resources in seawater, and the development of low-cost and high-efficiency adsorbents for uranium extraction from seawater has high economic and environmental-friendly benefits. In this work, a polyethyleneimine modified MWCNTs adsorbent was fabricated and used for uranium capture. The prepared samples exhibited excellent removal efficiency (～ 82.39～96.98%) and adsorption selectivity (with a Kd ～2.34?×104～1.61?×105 mL/g) in the pH range of 4.0–8.0, which obviously superior than that of pure MWCNTs (～ 36.16～52.65%, Kd ～2.83?×103 ～5.56?×103 mL/g). The adsorption process followed a pseudo-second-order kinetic model, and its maximum adsorption capacity reached 97.60?mg/g. In addition, due to the existence of various chelating ligands in PEI, the specimen showed excellent adsorption performance in various interfering ions and simulated seawater. Therefore, the adsorbed samples can be easily regenerated in low-concentration hydrochloric acid sol...

• 单位
  武汉理工大学