Abstract: To address the heavy metal pollution (beryllium (Be) and thallium (Tl)) caused by a lithium tailings site in
Yichun,Jiangxi Province,a functionalized nanocomposite material with carbon nanotubes as the matrix was successfully prepared.
The material was characterized using X-ray Photoelectron Spectroscopy (XPS),Fourier Transform Infrared Spectroscopy
(FT-IR),and Scanning Electron Microscopy (SEM). These characterizations confirmed that multiple active functional groups
were successfully introduced onto the material's surface. Systematic adsorption experiments showed that the material exhibits
rapid and efficient adsorption performance for Be2+ and Tl+ . The adsorption process reaches equilibrium within 30 minutes.
When the material dosage is 0. 6%,the removal rate of Be2+ reaches 94. 5%. For Tl+ ,a dosage of only 0. 3% achieves a removal
rate of 92. 5%. A nearly neutral solution (pH≈7) is most favorable for adsorption. Leaching toxicity tests,conducted in accordance
with the standard Solid Waste-Leaching Toxicity Leaching Method-Sulfuric Acid-Nitric Acid Method (HJ/ T 299—
2007),verified that the material can effectively solidify heavy metals in the tailings. This study provides a promising adsorbent
and feasible technical solution for the remediation of heavy metal pollution in lithium tailings.

Key words: carbon nanotube,lithium tailings,harmless treatment