As a whole, when brick pellets were pre-treated by HCl at 90°C, larger KL values were found and confirmed better association between brick and Fe(II) ions. Also, acid activation was found to have further positive effect on the maximum adsorption capacity, Qmax increasing from 0.179 - 0.264 mg/g to 0.669 mg/g by enhancing the Langmuir capacity of brick by about 300%. This phenomenon can be explained by the generation of a great number of additional adsorption sites through the HCl treatment of brick pellets preceding their FeOOH coating.