Adsorption tests on ZnO:Al (20%) rods were carried in batch mode. Typically, in a 100 mL reaction flask, 40 mg of ZnO: Al (20%) rods were added to 40 mL of an aqueous solution of the dye adjusted at neutral pH by adding 0.01 HCl or 0.01 M NaOH and the mixture was stirred at ca. 100 rpm and at …
