南方农业学报2025，Vol.56Issue(1)：192-203,12.DOI:10.3969/j.issn.2095-1191.2025.01.017
改性蛭石和木本泥炭对水体氨氮的吸附特性比较
Ammonia nitrogen adsorption characteristics in aqueous solution by modified vermiculite and woody peat
摘要
Abstract
[Objective]This experiments were performed to explore the ammonia nitrogen(NH4+-N)aqueous adsorp-tion characteristics and mechanism by modified vermiculite and woody peat,identify suitable materials for the removal of ammonia nitrogen from aqueous adsorption,which could provide scientific basis for the efficient and rapid treatment of ammonia nitrogen contaminated wastewater.[Method]Natural vermiculite,5 and 7 mol/L sulfuric acid-modified vermicu-lite and woody peat were selected as research materials.The characteristics and mechanisms of ammonia nitrogen aqueous adsorption were analyzed according to results from adsorption experiment by common soil conditioners,scanning electron microscope and the Fourier infrared spectrogram.[Result]The adsorption process of NH4+-N in aqueous solution by diffe-rent vermiculite materials was characterized by fast adsorption and slow equilibrium.Microcellular structure of natural ver-miculite was partially destroyed during the acid modification process,and the specific surface area and average pore dia-meter were increased.The specific surface area and total pore volume for 7 mol/L sulfuric acid-modified vermiculite were much lower than those under 5 mol/L sulfuric acid-modified vermiculite.Compared with natural vermiculite,adsorption rate constants(k1)from quasi-primary kinetic model for 5 and 7 mol/L sulfuric acid-modified vermiculite were increased by 2.09 and 1.45 times,the equilibrium adsorption amounts(qe)were increased by 3.39 and 1.86 times,and liquid-film diffusion rate constants(ka)were increased by 1.27 and 1.00 times respectively.The equilibrium time of adsorption of NH4+-N by woody peat was longer,k1 was lower than that of 2 acid-modified vermiculites,but qe was second only to 5 mol/L sulfuric acid-modified vermiculite.The adsorption processes of 4 materials were primarily monolayer adsorption,the fitting efficiency of Langmuir model was better than Freundlich model in isothermal adsorption process.The physical adsorption process for vermiculite materials was mainly relied on the surface properties and pore structure of the solid ma-terial,k1 and the maximum adsorption capacity(qm)both had significant positive correlation with the specific surface area(P<0.05),whereas woody peat relied on chemical reactions between active functional groups and NH4+-N.[Conclusion]Based on the comparison of multiple adsorption indicators and the availability of material sources,sulfuric acid-modified vermiculite and woody peat are recommended as the preferred adsorption attachments for ammonia nitrogen reduction in wastewater.关键词
氨氮吸附/天然蛭石/酸改性蛭石/木本泥炭Key words
ammonia nitrogen adsorption/natural vermiculite/acid-modified vermiculite/woody peat分类
农业科技引用本文复制引用
杨晓婷,段晓阳,张靖宇,王悦,石生伟..改性蛭石和木本泥炭对水体氨氮的吸附特性比较[J].南方农业学报,2025,56(1):192-203,12.基金项目
国家自然科学基金项目(32172778) （32172778）
北京高等教育学会教改项目(5046516654/013) National Natural Science Foundation of China(32172778) （5046516654/013）
Beijing Higher Education Associa-tion Teaching Reform Project(5046516654/013) （5046516654/013）
