| In this paper, there are different levels in our city drinking water, excess fluorine in the case, using the activated carbon adsorbent for fluoride adsorption studies. Details are as follows:(1)the chemical modification of activated carbon adsorbent, prepared by acid activation Fluorine efficient activated carbon adsorbent. Methods for the preparation of activated carbon in the original 3mol / L of hydrochloric acid dipping, mixing 5h, vacuum filtration and the filtrate washed with distilled water to neutral, and then in 2mol / L sodium hydroxide solution impregnation, vacuum mixing after 5h filtration and the filtrate washed with distilled water to neutrality, dried for several hours at 1100C, cooled, ground into powder, which was acid modified activated carbon adsorbent.(2) modification of acid concentration, alkali concentration of modifier, the activation time under different conditions, different forms of fluoride removal efficiency of activated carbon, the experimental results show that the modified acid-base properties of powdered activated carbon adsorbent most fluoride strong, fluoride removal efficiency can reach 87.6%, while the original activated carbon fluoride powder less than 50%. (3) to further examine the performance of modified active carbon fluoride. Adsorption conditions are the main factors affecting the initial adsorbate concentration, dosage, duration of oscillation, PH value, etc., obtained by static adsorption experiments of optimal conditions of adsorption: activated carbon dosage of 6g / L, adjusted PH value to 3, the oscillation time is 40min, initial fluoride concentration 15mg / L, in this condition, the removal rate reached 87.3% fluoride, fluoride ion concentrations in the effluent of drinking water health standards. The use of thermodynamic analysis, the Langmuir adsorption isotherm isotherm fitted better with increasing temperature and increasing equilibrium concentration of fluoride ion, the adsorption capacity is increasing.
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