Membrane and Water Treatment

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Desalination performance of Al2O3 positively charged nanofiltration composite membrane

  • Li, Lian (Zhejiang College of Security Technology) ;
  • Zhang, Xiating (Zhejiang College of Security Technology) ;
  • Li, Lufen (Zhejiang College of Security Technology) ;
  • Yang, Zhongcao (Zhejiang College of Security Technology) ;
  • Li, Yuan (Zhejiang College of Security Technology)
  • Received : 2021.12.14
  • Accepted : 2022.02.20
  • Published : 2022.03.25
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Abstract

Al2O3 positively charged nanofiltration composite membrane was successfully prepared with aluminate coupling agent (ACA) as modifier, sodium bisulfite (NaHSO3) and potassium persulfate (K2S2O8) as initiator and methacryloyloxyethyl trimethylammonium chloride (DMC) as crosslinking monomer. The surface of the membrane before grafting and after polymerization were characterized by SEM and FT-IR. Three factor and three-level orthogonal experiments were designed to explore the optimal conditions for membrane preparation, and the optimal group was successfully prepared. The filtration experiments of different salt solutions were carried out, and the retention molecular weight was determined by polyethylene glycol (PEG). The results showed that the polymerization temperature had the greatest effect on the rejection rate, followed by the reaction time, and the concentration of DMC had the least effect on the rejection rate. The rejection rates of CaCl2, MgSO4, NaCl and Na2SO4 in the optimal group were 83.8%, 81.3%, 28.1% and 23.6% (average value), respectively. The molecule weight cut-off of 90% (MWCO) of the optimal group was about 460, which belongs to nanofiltration membrane.

Keywords

References

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