###### Abstract  
With the rapid development of nuclear energy, the contamination of environmental water systems by uranium has become a significant threat to human health. To efficiently remove uranium from these systems, three types of silica-based polyamine resins--SiPMA-DETA (SiPMA-silica/poly methyl acrylate; DETA: diethylenediamine), SiPMA-TETA (TETA: triethylenetetramine), and SiPMA-TETA (TETA: tetraethylenetamine)--were successfully prepared, characterized, and evaluated in batch experiments. Characterization results showed that the silica-based polyamine resins were successfully prepared, and they exhibited a uniform shape and high specific surface area. SiPMA-DETA, SiPMA-TETA, and SiPMA-TETA had nitrogen contents of 4.08%, 3.72%, and 4.26%, respectively. Batch experiments indicated that these adsorbents could efficiently remove uranium from aqueous solutions with a pH of 5-9. The adsorption kinetics of U(VI) were consistent with the pseudo-second-order model, indicating that the adsorption process was chemisorption and that adsorption equilibrium was achieved within 10 min. SiPMA-TETA, with the longest polyamine chain, exhibited the highest adsorption capacity (>198.95 mg/g), while SiPMA-DETA, with the shortest polyamine chain, demonstrated the highest U(VI) adsorption efficiency (83%) with 100 mM Na\({}_{2}\)SO\({}_{4}\). SiPMA-TETA still removed over 90% of U(VI) from river water and tap water. The spectral analysis revealed that the N-containing functional groups on the ligand were bound to anionic uranium-carbonate species and possibly contributed to the adsorption efficiency. In general, this work presents three effective adsorbents for removing uranium from environmental water systems and thus significantly contributes to the field of environmental protection. uranium; adsorption; silica; polyamine resins 20241275020241275 with uranium at research institutions, nuclear energy generation, spent fuel treatment, and nuclear weapon manufacturing can lead to uranium contamination [3; 4]. These pathways of uranium contamination can result in uranium accumulation in aquatic organisms within environmental water systems [5]. The World Health Organization recommends that drinking water should not contain more than 30 ug/L uranium [6]. Uranium features both metal toxicity and radioactivity, and the ingestion of uranium-contaminated water or fish by humans can cause irreversible damage to the body. Therefore, removing radionuclide uranium from environmental water systems is crucial. There are various methods for removing radionuclide uranium from solutions, such as membrane filtration [7; 8], ion exchange [9; 10; 11; 12], co-precipitation [13; 14], and extraction [15]. However, the extraction method has a low treatment efficiency for solutions [15]. As for co-precipitation method, it easily causes secondary pollution. Although the membrane separation method is efficient, its service life is short and it is difficult to regenerate [7; 16]. Compared with these separation methods, ion exchange offers advantages in removing uranium from environmental water systems owing to its simplicity, cost-effectiveness, simple operation, and reusability [11]. Adsorbents for uranium removal can be categorized into inorganic, organic, and composite materials [17]. Inorganic adsorbents such as hydroxyapatite [18; 19], zero-valent iron [20; 21], and natural clinoptilolite zeolite [22; 23] have been widely studied. These adsorbents typically enrich uranium through ion exchange, reductive precipitation, or porous physisorption. However, inorganic adsorbents are less selective than organic adsorbents, and carbonates in environmental water systems can affect the adsorption efficiency of inorganic adsorbents [24]. Organic adsorbents, such as metal-organic frameworks (MOFs) [25], covalent organic frameworks [26; 27], and ion exchange resins [28; 29], offer a more targeted approach.