Correlation Engine 2.0
Clear Search sequence regions

  • acid (3)
  • blue (2)
  • catalysis (1)
  • crystal violet (2)
  • dyes (5)
  • fourier transform (1)
  • hydroxyl (1)
  • ion (1)
  • oxygens (1)
  • SEM (1)
  • silicates (2)
  • tungsten compounds (2)
  • Sizes of these terms reflect their relevance to your search.

    A heterogeneous catalyst comprising Keggin type polyoxometalate, silicotungstic acid (SiW12), and MCM-22 was synthesized using wet impregnation method and characterized by acidity measurement, BET, FT-IR, XRD, and SEM. Their catalytic activity was evaluated for the degradation of cationic organic dyes like methylene blue (MB), crystal violet (CV), and an azo dye Chryosidine Y (CY) in an aqueous solution. The experimental parameters such as catalyst amount, initial dye concentration, and contact time were studied for the degradation of dyes, and it was found that the cationic dyes like methylene blue and crystal violet show better activity as compared to azo dye Chryosidine Y. This may be attributed to better electrostatic interaction of these cationic dyes with the residual negative surface charge of the catalyst, due to presence of SiW12 ion as it is rich in surface oxygens and surface hydroxyl groups. The control experimental results showed that the presence of SiW12 at the surface of MCM-22 promoted the degradation reactions, and presence of multiple W-O bonds in polyoxometalate also played a key role in this reaction. The catalyst exhibits recycling ability without any significant loss in activity up to four cycles.


    Dhruvi Pithadia, Vinayak Hegde, Varsha P Brahmkhatri, Anjali Patel. New catalyst comprising Silicotungstic acid and MCM-22 for degradation of some organic dyes. Environmental science and pollution research international. 2021 Mar;28(9):10633-10641

    Expand section icon Mesh Tags

    Expand section icon Substances

    PMID: 33099729

    View Full Text