| 초록 |
Uniform silica microspheres with anomalous large mesopores were synthesized via hydrothermal synthesis for removal of uranium. N-dodecylamine (0.06 mol) and di(2-ethylhexyl)phosphoric acid (0.09 mol) used as uranium removal agents were mixed with HCl (0.8 mmol), tetraethyl orthosilicate (0.17 mol), and absolute ethanol (0.15 mol) for 1 hour. After post-hydrothermal treatment in an autoclave at 300 - 400 K for 24 h, the pore size of the resultant silica microspheres dramatically increased from around 10 to 50 nm, while BET surface area decreased from c.a. 500 to 200 m2/g. The maximum adsorption capacity among our silica composites for U(VI) was about 170 mg/g at pH 4. |
