改性活性炭吸附污水中氨氮的性能

Performance of modified activated carbon for ammonia adsorption in sewage water

采用浸渍法制备一系列过渡金属(Zn,Fe,Cu)改性活性炭吸附剂,并探讨其吸附污水中氨氮的性能。结果表明,过渡金属的添加能在一定程度上提高活性炭吸附氨氮性能,其中铜为最佳改性元素。分别采用准一级动力学方程、准二级动力学方程和颗粒内扩散方程对改性活性炭吸附氨氮行为进行拟合。结果显示改活性炭对氨氮的吸附过程可用Langmuir吸附等温方程较好地拟合,在温度为25℃时,单分子层饱和吸附量为7.19 mg/g,其吸附动力学较符合准二级反应动力学方程。

A series of transition metal （ Zn, Fe, Cu） modified activated carbon was prepared using impreg- nation method and the performance of ammonia adsorption was measured. Results show that the perform- ance of modified activated carbon can be enhanced in a certain extent by the addition of transition metal, and Cu-modified activated carbon is the best modified element. In addition, the kinetic data were respec- tively fitted by pseudo-first-order equation, pseudo-second-order equation and the intra-particle diffusion model. The results show that the adsorption of ammonia-nitrogen on modified activated carbon could be well fitted by Langmuir isotherms equation, and the theoretical maximum adsorption capacity is 7.19 mg/g. The dynamic adsorption data were well described by pseudo second order reaction rate model.