工业水处理 ›› 2025, Vol. 45 ›› Issue (7): 147-154. doi: 10.19965/j.cnki.iwt.2024-0561

• 试验研究 • 上一篇    

铁离子改性类水滑石吸附磷酸根的研究

刘思见1,2(), 范荣桂1, 刘猛2, 纳云3, 马巍3, 陈荣志2()   

  1. 1. 辽宁工程技术大学环境科学与工程学院,辽宁 阜新 123000
    2. 中国科学院大学资源与 环境学院,北京 100049
    3. 青海省生态环境规划和环保技术中心,青海 西宁 810007
  • 收稿日期:2024-10-14 出版日期:2025-07-20 发布日期:2025-07-22
  • 通讯作者: 陈荣志
  • 作者简介:

    刘思见(1998— ),硕士,E-mail:

  • 基金资助:
    青海省农村分散式生活污水治理关键技术应用推广项目(2023000107)

Study on phosphate adsorption by layered double hydroxides modified with ferrous ion

Sijian LIU1,2(), Ronggui FAN1, Meng LIU2, Yun NA3, Wei MA3, Rongzhi CHEN2()   

  1. 1. College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, China
    2. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
    3. Qinghai Ecological Planning and Environmental Protection Technology Center, Xining 810007, China
  • Received:2024-10-14 Online:2025-07-20 Published:2025-07-22
  • Contact: Rongzhi CHEN

摘要:

镁铝类水滑石(MgAl-LDH)的层间阴离子交换是其吸附磷酸根的主要作用机理,增强层间离子交换作用,有望实现对磷酸根的高效去除。采用铁离子对MgAl-LDH改性制备铁镁铝类水滑石(Fe x MgAl-LDH,x为铁离子浓度,mmol/L),用来吸附溶液中的磷酸根。结果表明,Fe50MgAl-LDH在pH为3.0~8.0具有较好的吸附性能,受共存离子干扰较小,循环再生性能良好;Fe50MgAl-LDH对磷酸根的最大吸附量为53.47 mg/g,且对磷酸根的吸附速率〔0.12 g/(mg·min)〕是MgAl-LDH的2.4倍;对磷酸根的吸附过程符合拟二级反应动力学模型和Langmuir等温线模型,以单分子层化学吸附为主。结合X射线衍射(XRD)、傅里叶红外光谱(FTIR)表征对类水滑石材料吸附磷酸根进行机理研究,表明Fe50MgAl-LDH对磷酸根优异的吸附性能主要是由于层间离子交换能力及配体交换作用的增强。

关键词: 镁铝类水滑石, 铁离子改性, 吸附磷酸根, 层间交换

Abstract:

The interlayer anion exchange of magnesium-aluminium layered double hydroxide(MgAl-LDH) is the main limiting factor for phosphate adsorption. Therefore, the enhancement of interlayer ion exchange is expected to achieve efficient removal of phosphate. In this study, ternary layered double hydroxides(Fe x MgAl-LDH, where x represents the ferrous ion concentration in mmol/L) was prepared to adsorb phosphate from aqueous solutions. The results showed that Fe50MgAl-LDH exhibited superior adsorption performance within pH range of 3.0-8.0, with minimal interference from coexisting ions and excellent regeneration capability. The maximum phosphate adsorption capacity of Fe50MgAl-LDH reached 53.47 mg/g, and its adsorption rate 〔0.12 g/(mg·min)〕 was 2.4 times higher than that of MgAl-LDH. The adsorption process fitted the pseudo-second-order kinetic model and the Langmuir isotherm model, indicating the monolayer chemisorption. Combined with X-ray diffraction(XRD) and Fourier transform infrared spectroscopy(FTIR), the mechanism of phosphate adsorption by the LDH material was investigated. The results revealed that the enhanced phosphate adsorption performance of Fe50MgAl-LDH was mainly attributed to the improved interlayer ion exchange and ligand exchange effects.

Key words: magnesium-aluminium layered double hydroxide, ferrous modification, phosphate adsorption, interlaminar exchange

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