SO42- /TiO2 solid acid was used for photocatalytic degradation of CH3Br, an
d its photocatalytic activity is 2 similar to 10 times higher than that of
TiO2 under the same reaction conditions. The SO42-/TiO2 sample impregnated
with H2SO4 solution (1 mol/L) is of superacidity (H-0< -12.14), possessing
the highest acid strength and the highest photocatalytic activity for degra
dation of CH3Br.