Research & Development

Preparation of Ca-based LDO composite material and its adsorption performance for phosphate

  • ZHANG Lijin ,
  • Lü Qing ,
  • CHEN Xiaolang ,
  • LI Qingxin ,
  • SHI Hongyu ,
  • QIN Jun
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  • 1.Key Laboratory of Karst Georesources and Environment,Ministry of Education,College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China
    2.Key Laboratory of Advanced Materials Technology Ministry of Education,School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China

Received date: 2023-09-28

  Online published: 2024-08-01

Abstract

The release of untreated excess phosphate into the water system will lead to very serious environmental problems.In order to remove excessive phosphate in water,the raw materials of solid waste flue gas desulfurization gypsum and Mg-Al hydrotalcite were mixed according to the initial molar ratio,and then a high⁃efficiency phosphorus removal adsorbent was prepared by hydrothermal synthesis and roasting,and characterized by XRD,FT-IR,SEM,BET and TGA.Taking phosphate as the target pollutant,the effects of adsorbent dosage,time,initial concentration,temperature,pH value of initial solution and coexisting ions on adsorption capacity and cyclic adsorption capacity of adsorbent were investigated.The results showed that Freundlich adsorption isotherm and pseudo⁃second⁃order kinetic equation could describe the adsorption process of phosphate well.Under the conditions of 25 ℃,pH=12 and adsorbent dosage of 10 mg,the adsorption capacity could reach 209.02 mg/g,and the adsorption behavior was relatively stable in the pH range of 4~11.The adsorption mechanism included internal diffusion,ligand exchange and precipitation reaction.This work not only provided a method for effectively utilizing solid waste to prepare adsorbent,but also provided theoretical significance for controlling eutrophication of water body and realizing waste recycling.

Cite this article

ZHANG Lijin , Lü Qing , CHEN Xiaolang , LI Qingxin , SHI Hongyu , QIN Jun . Preparation of Ca-based LDO composite material and its adsorption performance for phosphate[J]. Inorganic Chemicals Industry, 2024 , 56(7) : 37 -45 . DOI: 10.19964/j.issn.1006-4990.2023-0471

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