Besides, the methylene blue value of Acid-B–SBA–K was twice that of SBA.
These changes can be explained by the
pyrolysis activation and HNO3 oxidation.
The surface of Acid-B–SBA–K had been changed in both pore diameter and special functional group due to HNO3 oxidation, which made Acid-B–SBA–K
totally different from B–SBA–K.