The system pH plays significant role in Congo red adsorption. As pH increase from 4 to 7,the color removal increases rapidly from 22.5% to max 96.0%,and then decreases slowly to 91.4% as the increase of pH.

• pH值对刚果红吸附影响较大；pH从4增大到7；脱色率迅速从22.；5%25增加至96