The milled CAB was added to dilute H2SO4 (Vetec, Rio de
Janeiro, Brazil) of different concentrations (0.0, 0.2, 0.4, 0.6, 0.8
and 1.0 mol/L) to form a slurry with a solid concentration of 15%
w/v. In this work, a treatment in water without H2SO4 (no acid
was added) was conducted, here in named control set up