Batch tests were conducted at room temperature (28±1 ◦C)
to obtain the adsorption rates and equilibrium data. Unless otherwise
stated, 250mL conical flasks, each filled with 100mL
of Cr (VI) solutions and 500 mg treated fibre were used in all
experiments. The desired initial pH and Cr (VI) concentrations
of the test solutions were adjusted according to the purpose of
the test. The flask contents were agitated using an orbital shaker
for the desired period at a speed of 350 rpm. What man No. 1
filter paper was used to filter the contents of the flask, followed
by the analysis of Cr (VI) in the filtrate using a Hach DR 2010
Spectrophotometer.