农业环境科学学报2024，Vol.43Issue(8)：1760-1770,11.DOI:10.11654/jaes.2023-0889
塿土胶体对氮磷钾吸附性能的尺寸效应
Size effects of Lou soil colloids on the adsorption properties of ammonium,phosphate,and potassium
摘要
Abstract
This study was conducted to investigate the size effects of Lou soil colloids on the adsorption behaviors and mechanisms of nitrogen,phosphorus,and potassium.The colloidal fractions of Lou soil with diameters of<2 000,<1 000,<500,<200 nm,and<100 nm were extracted using high-speed centrifugation,and their particle size distribution,element contents,and zeta potentials were determined.The adsorption behaviors of ammonium(NH4+),phosphate(PO43-),and potassium(K+)were assessed through batch adsorption experiments.The results showed that the particle size distributions of coarse soil colloids with diameters of<2 000 nm and<1 000 nm exhibited a bimodal distribution,whereas the fine soil colloids with diameters of<500,<200 nm,and<100 nm had a unimodal distribution.As the mean particle diameter decreased,increases in the total carbon and organic carbon contents for all soil colloidal fractions were observed.Furthermore,the absolute values of zeta potential increased at higher pH levels,accompanied by increases in charge density and charge variability with increasing particle diameter.The adsorption processes of NH4+,PO43-,and K+by Lou soil colloids of different diameters conformed to pseudo-first-order dynamics and the Freundlich model.This suggests that the adsorption process is characterized by physical diffusion and multi-molecular layer adsorption.Furthermore,the size of the colloids significantly influenced the adsorption behaviors of NH4+,PO43-,and K+.Notably,the highest adsorption capacity was observed in the coarse soil colloidal particles(<2 000 nm),indicating that differences in nutrient adsorption among Lou soil colloids are primarily regulated by variations in charge density.关键词
塿土胶体/纳米颗粒/颗粒直径/养分元素/吸附性Key words
soil colloidal fractions from Lou soil/nanoparticles/particle diameter/nutrients/adsorption分类
资源环境引用本文复制引用
李昕,丁维,闫雨阳,许晨阳,杜伟,胡斐南,耿增超..塿土胶体对氮磷钾吸附性能的尺寸效应[J].农业环境科学学报,2024,43(8):1760-1770,11.基金项目
国家自然科学基金项目(41701261) （41701261）
陕西省自然科学基金项目(2023-JC-YB-263) （2023-JC-YB-263）
中央高校基本科研业务费(2452020165) National Natural Science Foundation of China(41701261) （2452020165）
Natural Science Foundation of Shaanxi,China(2023-JC-YB-263) （2023-JC-YB-263）
Fundamental Research Funds for the Central Universities(2452020165) （2452020165）
