无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2024, Vol. 56 ›› Issue (10): 38-46.doi: 10.19964/j.issn.1006-4990.2023-0557

• 研究与开发 • 上一篇    下一篇

介孔形貌的LDH吸附磷酸盐的位点能量研究

史鸿钰1(), 吕晴2, 张力巾1, 李清欣1, 秦军2()   

  1. 1.贵州大学资源与环境工程学院,贵州 贵阳 550025
    2.贵州大学喀斯特地质资源与环境教育部重点实验室,贵州 贵阳 550025
  • 收稿日期:2023-11-22 出版日期:2024-10-10 发布日期:2024-11-05
  • 通讯作者: 秦军(1970— ),男,博士,教授,研究方向为环境功能材料;E-mail:qi_njun@163.com
  • 作者简介:史鸿钰(1999— ),女,在读硕士,研究方向为环境功能材料;E-mail:hongyugzu@163.com
  • 基金资助:
    国家自然科学基金项目(22365009);贵州大学引进人才科研项目(贵大人基合字(2022)07号)

Study on site energy of phosphate adsorption by layered double hydrotalcites with mesoporous morphologies

SHI Hongyu1(), LÜ Qing2, ZHANG Lijin1, LI Qingxin1, QIN Jun2()   

  1. 1.Guizhou University,College of Resources ang Environment Engineering,Guiyang 550025,China
    2.Guizhou University,Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guiyang 550025,China
  • Received:2023-11-22 Published:2024-10-10 Online:2024-11-05

摘要:

水体磷污染是一个亟待解决的环境问题,威胁生物健康并破坏生态平衡。通过水热法制备了分别具有CO32-型堆积片层状、CH2CHCOO-型插层岩石状和CH2CHCOO-型重组漏斗孔型岩石状的水滑石。使用密度泛函理论研究了不同层间离子与水滑石片层的作用关系。通过等温吸附实验,并采用基于Toth模型和DA模型的位点能量分布理论分析了不同形貌结构的水滑石对磷酸盐的吸附特性。结果表明:漏斗孔型水滑石的吸附位点分布在高能量区,其余两种水滑石的位点分布在低能量区;随温度升高,3种水滑石的位点分布向高能量区偏移,平均位点能量增加了12.04%~14.26%。通过丙烯酸调控得到的漏斗孔型水滑石具有更多的高能吸附位点数量、更大的比表面积和更强的配体交换作用,同时随着温度和浓度增加,漏斗孔型水滑石位点能量分布变化最为显著,表明漏斗孔型水滑石在磷酸盐吸附中具有优势。该研究对水滑石的调控及通过位点能量分布理论研究水滑石为磷酸盐的吸附机制提供了理论依据。

关键词: 水滑石, 形貌结构, 吸附, 磷酸盐, 位点能量分布

Abstract:

Phosphorus pollution in water bodies is an urgent environmental problem,which threatens biological health and destroys ecological balance.In this paper,Mg-Al layered double hydrotalcites with CO32- type stacking lamellae,CH2CHCOO- type intercalated rock⁃like,and CH2CHCOO- type recombined funnel⁃shaped and rock⁃like were prepared respectively by hydrothermal method.The interaction between different interlayer ions and hydrotalcite lamellae was studied by density functional theory.Through isothermal adsorption experiment and site energy distribution theory based on Toth model and DA model,the phosphate adsorption characteristics of hydrotalcites with different morphology and structure were analyzed.The experimental results showed that the adsorption sites of funnel⁃shaped hydrotalcite were distributed in high energy region,while the sites of the other two hydrotalcites were distributed in low energy region.With the increase of temperature,the site distribution of the three hydrotalcites shifted to the high energy region,and the average site energy was increased by 12.04% to 14.26%.Funnel⁃shaped hydrotalcite obtained by acrylic acid regulation had more high⁃energy adsorption sites,larger specific surface area and stronger ligand exchange.At the same time,with the increase of temperature and concentration,the energy distribution of funnel⁃shaped hydrotalcite sites changed most significantly,indicating that funnel⁃shaped hydrotalcite had advantages in phosphate adsorption.This study provided a theoretical basis for the regulation of mesoporous hydrotalcite and the study of phosphate adsorption mechanism of hydrotalcite through site energy distribution theory.

Key words: layered double hydrotalcite, morphological structure, adsorption, phosphate, site energy distribution

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