摘要
Abstract
In order to efficiently remove ammonia nitrogen from industrial wastewater,coconut shell activated carbon was used as the raw material to prepare high-performance adsorbents through alkaline solution modification.Through surface feature analysis,it is found that the pore volume and adsorption average pore size of coconut shell activated carbon modified with 2 mol/L sodium hydroxide are the smallest,and the specific surface area is the largest.The adsorption performance of modified activated carbon was studied by different system temperatures,and the results showed that temperature had a great influence on the adsorption efficiency of ammonia nitrogen.The optimal adsorption effect at 35℃,and the theoretical adsorption capacity was calculated to be 38.8 mg/g by fitting the Langmuir equation of the isotherm adsorption model.The adsorption behavior of modified coconut shell activated carbon conforms to the quasi-second-order kinetic model,which further indicates that the adsorption of ammonia nitrogen compounds in wastewater is an easily occurring chemical adsorption process.It can be seen that the modified coconut shell activated carbon,as a high performance adsorption material,has good application value in removing ammonia nitrogen compounds in water.关键词
改性活性炭/氨氮/吸附行为/等温线/热力学模型Key words
activated carbon/ammonia nitrogen/adsorption behavior/isotherm/thermodynamic model分类
资源环境
