Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (6): 1853-1862.doi: 10.13278/j.cnki.jjuese.20200053

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Removal of Perfluorooctanoic Acid (PFOA) in Aqueous Solution Using Highly Adsorptive Coal Chemical Slag

Liu Na1,2, Wang Jinxin1,2, Jiao Xinqian1,2, Luo Feng3,4   

  1. 1. College of New Energy and Environment, Jilin University, Changchun 130021, China;
    2. Key Laboratory of Groundwater Resources and Environment(Jilin University), Ministry of Education, Changchun 130021, China;
    3. School of Materials Science and Engineering, Jilin University, Changchun 130022, China;
    4. Key Laboratory of Automobile Materials(Jilin University), Ministry of Education, Changchun 130022, China
  • Received:2020-04-07 Online:2021-11-26 Published:2021-11-24
  • Supported by:
    Supported by the National Natural Science Foundation of China (41572217) and the "111" Project of China (B16020)

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Abstract: Industrial waste coal chemical residues were selected as absorbent to remove perfluorooctanoic acid (PFOA) in water. Four kinds of coal chemical slag (particle size range from large to small was CGA1, CGA2, CGA3, and CGA4) prepared by different treatment methods were used to evaluate their sorption performance for PFOA. Scanning electron microscope (SEM), Raman, Fourier transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) were used to characterize the structures of the four kinds of coal chemical slag, and the effects of initial concentration and pH of the PFOA solution on the adsorption process were investigated. The results showed that the absorbents had high efficiency for PFOA removal. The adsorption was well described by the pseudo-second-order kinetic model and the Langmuir isothermal model. With the increase of the initial concentration of PFOA solution, the adsorption capacity of the coal chemical slag for PFOA increased gradually. The initial pH value had almost no impact on CGA3 and CGA4; While for CGA1 and CGA2, it showed better adsorption performance under acidic conditions than alkaline conditions. It is concluded that CGA4 (the smallest particle size) has the best PFOA removal ability and is almost unrestricted by pH. The maximum adsorption capacity of CGA4 is 25.51 mg/g. The FTIR analysis suggested that the formation of hydrogen bonds dominates the adsorption process. The results of XPS and zeta potential showed that physical and electrostatic adsorption also plays important roles in the removal progress. Therefore, coal chemical slag can be used as a promising adsorbent to remove the difficult-to-treat pollutants and promote the recycling of waste and sustainable development.

Key words: coal chemical slag, perfluorooctanoic acid, adsorption, waste disposal

CLC Number: 

  • X705
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