Abstract: New organic modified absorbent which its raw material was red mud and prepared by means of dipping CTMAB，and its ability to remove phosphorus was studied. The results indicated that the removal rate of phosphorus from the simulate phosphorus wastewater which the initial concentration was 5 mg/L and pH=3，can reach 90% under conditions：8 g/L of CTMAB concentration， 500 ℃ of roasting temperature and 60 min of the reaction time. According to the results the adsorption isotherm of phosphorus was established by Freundlich model. Thermodynamic analysis announced that its process was spontaneous.

Key words: Red mud, Organic modification, Adsorbent, Phosphorus removal