| 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. |
| 施氏矿物对磷的吸附特性 |
| Adsorption kinetics and environmental impact mechanisms of schwertmannite on phosphorus |
| 投稿时间：2024-07-25 |
| DOI：10.11654/jaes.2024-0634 |
| 中文关键词: 施氏矿物 磷 连续表征 吸附机理 影响机制 |
| 英文关键词: schwertmannite phosphorus dynamic representation adsorption mechanism influencing factor |
| 基金项目:国家自然科学基金项目（32160299，42167028） |
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| 摘要点击次数: 1847 |
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| 中文摘要: |
| 为探究施氏矿物（Schwertmannite，SCH）对PO43-的吸附机理及其作为PO43-吸附剂的可能性，本研究以SCH对PO43-的吸附性能为研究主线，以全过程SCH的连续表征为手段，开展了SCH对PO43-的吸附动力学研究，讨论了pH及As（Ⅲ）和Cr （Ⅵ）等共存离子竞争吸附对SCH吸附PO43-的影响，揭示了SCH对PO43-的吸附机理及机制。研究表明：SCH对PO43-的吸附符合准二级动力学及3段式颗粒内扩散模型，以化学吸附为主且属于非均相扩散过程，24 h内的平衡吸附量可达17.38mg·g-1。PO43-可通过配体交换作用和离子交换作用与SCH结合，且PO43-优先与SCH表面的OH发生配体交换，而后再与SCH中的SO42-发生离子交换，两种吸附机制均可增强SCH的稳定性。连续表征结果表明，SCH吸附PO43-的过程中伴随有水铁矿次生矿物的生成。As（Ⅲ）通过与PO43-竞争吸附位点抑制了SCH对PO43-的吸附，而Cr （Ⅵ）则通过为PO43-开拓吸附位点的方式促进了SCH对PO43-的吸附，且碱性条件更有利于SCH对PO43-的吸附。 |
| 英文摘要: |
| 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. |
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