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利用壳聚糖负载MnO_2制备一种复合吸附剂。研究了溶液pH值、吸附时间、温度对As(Ⅲ)吸附行为的影响,并探讨了吸附动力学。结果表明,在pH值为5～8,吸附时间为60 min,温度为60℃,复合吸附剂对As(Ⅲ)的吸附率达98%以上,吸附能力明显优于壳聚糖。对试验数据运用相关数学模型拟合表明,复合吸附剂对As(Ⅲ)的吸附符合Langmuir和Freundlich吸附等温式,最大吸附量q_(max)为19.798mg/g,特性常数n为4.334 1,决定系数R~2分别为0.997 5、0.980 4。吸附过程动力学适合二级动力学方程。
Preparation of a composite adsorbent using chitosan supported MnO2. The effects of pH value, adsorption time and temperature on the adsorption of As (Ⅲ) were investigated. The adsorption kinetics was also discussed. The results showed that the adsorption of As (Ⅲ) on the composite adsorbent was above 98% at pH 5 ~ 8, adsorption time 60 min and temperature 60 ℃, and the adsorption capacity of the composite adsorbent was better than that of chitosan. The experimental data fitting mathematical model showed that the adsorption of As (Ⅲ) by the composite adsorbent was in accordance with the Langmuir and Freundlich adsorption isotherms with the maximum adsorption capacity of 19.798 mg / g and the characteristic constant n of 4.334 1 The coefficients R ~ 2 are 0.997 5 and 0.980 4, respectively. Adsorption kinetics is suitable for second order kinetic equation.