环氧氯丙烷改性花生壳对次甲基蓝的吸附研究

Study on Adsorption of Methylene Blue in Solution with Epichlorohydrin Modified Peanut Shell

以花生壳为原料,环氧氯丙烷为改性剂,对花生壳进行改性制备吸附剂,并对其吸附次甲基蓝的性能作了较系统的研究。结果表明,在2.0 g花生壳中分别加入1.25 mol/L的NaOH溶液45 mL和环氧氯丙烷25 mL,控制温度40℃,搅拌反应30 min,经过滤、水洗干燥后得到改性的花生壳,用此改性的花生壳吸附次甲基蓝的最佳条件为:处理100 mg/L的次甲基蓝溶液50 mL,用0.2 g改性花生壳,pH值在6.48,搅拌吸附60 min,在此条件下吸附率可达99%,吸附后的花生壳用0.5 mol/LNaOH溶液再生,重复使用3次对次甲基蓝的吸附率在96%以上;未改性花生壳对次甲基蓝的吸附率仅为82%。

An absorbent was prepared from peanut shell by epichlorohydrin modification. Its adsorption performance for methylene 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 25 mL to modify 2.0 g peanuts shell, controlling reaction temperature at 40℃, mixing time for 30 min, 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, 0.2 g modified peanut shell, pH value 6.48, stirring time 60 min. 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 %.