| Tóm tắt |
Activated carbons (ACs) prepared from rice husk by KOH activation in inert atmosphere
at 750 and 850o
C were modified with nitric acid. Activation at 850o
C resulted in better
pore development and was confirmed by SEM, Boehm titration and BET. The
modification by nitric acid could reduce the particle size while enhance the amount of
hydroxyl and carbonyl groups on the surface of AC samples. Bath adsorption of benzene,
toluene and m-xylene (BTX) as well as dynamic adsorption of m-xylene were measured
in order to evaluate the performance of AC for removing volatile organic compounds
(VOCs). The results showed that AC sample prepared at 850o
C (RH-850) exhibited the
best benzene adsorption capacity of 11.62 mmol g-1
in bath adsorption and m-xylene
adsorption capacity of 9.140 mmol g-1
in dynamic adsorption at 50o
C. |