改性花生壳和木屑对水中活性艳红的吸附研究

Study on adsorption of reactive brilliant red in water by modified peanut shell and sawdust

用经过磷酸改性的花生壳和木屑制成混合吸附剂对水中活性艳红K-2BP进行吸附研究,通过静态试验系统地考察了混合吸附剂中改性花生壳和木屑的质量比、混合吸附剂的投加量、p H、温度和振荡速率等重要因素对K-2BP吸附效果的影响,并对吸附机理进行了探讨。研究结果表明:改性花生壳和木屑对10 mg/L K-2BP吸附的最佳条件为:改性花生壳和木屑的质量比1∶3.5,混合吸附剂的投加量0.9 g,温度328 K,p H值14,振荡速率120r/min,水中K-2BP的去除率可达98.6%,影响因素中p H值的影响最大。Langmuir吸附模型和伪二级动力学模型能较好地描述混合吸附剂对水中K-2BP的吸附过程,理论的最大吸附量为10.83 mg/g,吸附过程为吸热反应,可自发进行,因此改性花生壳和木屑吸附K-2BP技术在实际污染处理中具有良好的应用前景。

The paper studied the adsorption of reactive brilliant red K -2 BP by peanut shell and sawdust modified by phosphoric acid .The influence of the important factors such as the mass ratio of modified pea-nut shells and sawdust , dosage of mixed adsorbent , pH value , reaction temperature and oscillation rate on adsorption effect was systematically examined through static experiment .It also studied the adsorption mechanism .The results showed that the optimal conditions of adsorption are that the mass ratio of modi-fied peanut shells and sawdust is 1∶3.5, the dosage of mixed adsorbent is 0.9 g, the reaction tempera-ture is 328 K, the pH is 14,and the oscillation rate is 120 r/min.The removal efficiency of K-2BP rea-ches 98.6%.The most impact factor pH.The adsorption process of K -2BP by mixed adsorbent in water accorded with Langmuir mode and fitted well with pseudo second -order model .The maximum amount of theoretical adsorption is 10.83 mg/g.The adsorption process is endothermic and spontaneous .Overall, the adsorption technology of K -2 BP by modified peanut shells and sawdust has good application prospect in treatment of pollutant .