核桃壳的改性优选及其对氨氮的吸附特性研究

Research on modification optimization of walnut shell and adsorption performance of ammonia nitrogen by modified walnut shell

用磷酸改性核桃壳吸附去除模拟废水中的氨氮。探讨了改性核桃壳的粒径、溶液pH、吸附时间、吸附温度、吸附剂投加量、氨氮的初始浓度等对吸附NH_3-N效果的影响。结果表明,吸附处理100 mL浓度50 mg/L的氨氮模拟水样的最佳吸附条件:温度25℃,0.6~1.0 mm粒径的磷酸改性核桃壳1.0 g、介质pH 8.0,吸附时间60 min。在此条件下,氨氮的去除率可达70%左右。Langmuir、Freundlich等温吸附方程和拟二阶动力学模型能很好地描述吸附过程。

Choosing phosphoric acid modified walnut shell adsorption to removal ammonia nitrogen in simulated wastewater. Discusses the effect of the different size of modified walnut shell,the solution p H,adsorption time,adsorption temperature,adsorbent additive quantity,ammonia nitrogen initial concentration on NH_3-N adsorption. The results showed that the best adsorption conditions of the 100 mL ammonia nitrogen simulated water samples that have the concentration of 50 mg/L,temperature 25 ℃,0. 6 ~1. 0 mm diameter of phosphoric acid modified walnut shell 1. 0 g,medium pH 8. 0,adsorption time60 min,ammonia nitrogen removal rate can reach 70%. The Langmuir,Freundlich isothermal adsorption equation and pseudo second order kinetics model can better describe the adsorption process.