Instant removal of methylene blue using water-soluble non-cadmium based quantum dots

Gracia It Mwad Mbaz, Sundararajan Parani, Oluwatobi Samuel Oluwafemi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Contamination of water sources by dye and colourant industries has been a serious issue that could lead to a water crisis. Herein, we report a novel method for instant removal of methylene blue (MB) from the aqueous solution using water-soluble AgInS2-ZnS (AIS-ZnS) quantum dots (QDs) as coagulant material. Briefly, AIS-ZnS QDs were synthesized in an aqueous medium using glutathione and sodium citrate as dual stabilizing agents. The as-synthesized AIS-ZnS QDs was simply mixed with MB solution and immediately filtered with a 20 nm filter to obtain clear water with very low conductivity. The removal of MB by coagulation with AIS-ZnS QDs followed by filtration was efficiently high up to 99.3%. This result shows AIS-ZnS QDs as an excellent candidate for the rapid removal of dyes.

Original languageEnglish
Article number130495
JournalMaterials Letters
Publication statusPublished - 15 Nov 2021


  • Dye removal
  • Filtration
  • Methylene blue
  • Quantum dots
  • Water treatment

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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