摘要
实验室模拟条件下以内蒙古归流河、弱水河、锡林河、洮儿河以及岱海5条河流的表层沉积物为研究对象,对氨氮、硝态氮进行吸附实验,探究动力学吸附规律及等温吸附特征。结果表明,沉积物对氨氮、硝态氮的吸附量随时间增加而增长,一定时间趋于稳定,吸附动力学过程与Lagergren准二级吸附动力学模型拟合的相关性较显著,属于化学吸附。吸附热力学过程符合Langmuir等温吸附模型,都属于单分子层吸附。沉积物对氨氮的吸附过程用Freundlich等温吸附模型也能很好地描述,1/n在0.8622~1.0526之间,说明吸附过程较容易进行,其中岱海吸附能力最强,洮儿河吸附能力较差;沉积物对硝态氮的吸附用Langmuir等温吸附模型描述,弱水河吸附能力较强,归流河吸附能力较差。
This article has studied the adsorption/desorption of ammonia on surface sediments from the Guiliu River,Ruoshui River,Xilin River,Taoer River,and Daihai in Mongolia in laboratory simulated condition,and the dynamic adsorption law and isothermal adsorption characteristics of sediments were explored.The results show that the kinetics of ammonia and nitrate nitrogen adsorption by surface sediments had a better correlation with the Lagergren’s second-order adsorption kinetics model;They can described by Langmuir isotherm model and belong to monolayer adsorption.Freundlich isothermal adsorption model can well describe the process of ammonia nitrogen adsorption on sediments.1/n is between 0.8622~1.0526.It shows that the adsorption process is easier,in which the Daihai has strong adsorption capacity and the adsorption capacity of the Taoer River is poor;Langmuir isothermal adsorption model was used to describe the adsorption of nitrate nitrogen by sediments.The results show that the Ruoshui River has strong adsorption capacity and the adsorption capacity of the Guiliu River is poor.
作者
孙淑芳
王晓丽
SUN Shu-fang;WANG Xiao-li(College of Chemistry and Environmental Sciences,Inner Mongolia Normal University,Inner Mongolia KeyLaboratory of Environmental Chemistry,Hohhot 010022,China)
出处
《应用化工》
CAS
CSCD
北大核心
2020年第5期1105-1109,共5页
Applied Chemical Industry
基金
国家自然科学基金资助项目(41263005)
内蒙古自治区水环境安全协同创新培育中心(XTCX003)
内蒙古师范大学研究生科研创新基金项目(CXJJS18080)。
关键词
表层沉积物
氨氮
硝态氮
吸附
sediment
nitrate nitrogen
ammonium
adsorption
