Abstract: An absorbent was prepared from peanut shell by epichlorohydrin modification. Its adsorption performance for methy-lene blue in solution was also studied. The results indicate: the modified peanut shell was obtained by using 1.25 mol/L NaOH solution 45 mL and epichlorohydrin 25mL to modify 2.0g peanuts shell, controlling reaction temperature at 40℃, mixing time for 30min,filtering, water washing and drying. The optimal adsorption condition of modified peanut shell to methylene blue was: 50 mL of 100 mg/L methylene blue solution, 0.2g modified peanut shell, pH value 6.48, stirring time 60min. The adsorption rate of modified peanut shell was 99%. The used peanut shell could be regenerated by 0.5 mol/L NaOH solution. The adsorption rate of regenerated peanut shell after being used three times was over 96%. The adsorption rate of unmodified peanut shell to methylene blue was only 82%.

Key words: epichlorohydrin, peanut shell, methylene blue, adsorption