农业环境科学学报2025，Vol.44Issue(7)：1848-1859,12.DOI:10.11654/jaes.2024-0634
施氏矿物对磷的吸附特性
Adsorption kinetics and environmental impact mechanisms of schwertmannite on phosphorus
摘要
Abstract
To explore the adsorption mechanism of schwertmannite(SCH)for PO43- and the possibility of its application as a PO43- adsorbent,this study focuses on the adsorption behavior of SCH towards PO43-,employing continuous characterization of SCH throughout the process as a means to investigate its adsorption kinetics for PO43-.The study also discusses the impact of pH and the competitive adsorption of As(Ⅲ)and Cr(Ⅵ)ions on SCH's ability to adsorb PO43-,thereby revealing the underlying mechanism governing SCH's affinity for PO43-.The findings indicate that the adsorption of PO43- by SCH follows quasi-second-order kinetics and a three-stage intraparticle diffusion model,with chemical adsorption being the primary mechanism within a non-homogeneous diffusion process.The equilibrium adsorption capacity within 24 hours can reach 17.38 mg·g-1.We observed that PO43- can interact with SCH through ligand exchange and ion exchange processes.Specifically,-OH groups on the surface of SCH are preferentially involved in ligand exchange with PO43-,followed by ion exchange with SO42- within SCH,both mechanisms contributing to enhanced stability.Continuous characterization results further revealed the generation of secondary minerals such as water iron during the process of PO43- adsorption by SCH.Furthermore,we found that As(Ⅲ)competes for adsorption sites with PO43-,thus inhibiting its uptake by SCH;conversely,Cr(Ⅵ)promotes the adsorption of PO43- by providing additional binding sites,and alkaline conditions were shown to be more conducive to effective PO43- adsorbing performance by SCH.关键词
施氏矿物/磷/连续表征/吸附机理/影响机制Key words
schwertmannite/phosphorus/dynamic representation/adsorption mechanism/influencing factor分类
资源环境引用本文复制引用
都达古拉,宋文杰,谢志磊,李浩,李智超,何江..施氏矿物对磷的吸附特性[J].农业环境科学学报,2025,44(7):1848-1859,12.基金项目
国家自然科学基金项目(32160299,42167028) National Natural Science Foundation of China(32160299,42167028) （32160299,42167028）
