Removal of insoluble heavy metal sulfides from water

Research output: Contribution to journalArticle

30 Citations (Scopus)


The necessity of heavy metal removal from wastewater has led to increasing interest in absorbents. We have developed a new approach to obtain high metal adsorption capacity by precipitating metal sulfides with sodium sulfide on the surface of bentonite and adhere them to the absorbent. This method allowed to remove approximately 90% of cadmium as CdS from 10-4-10-6 M CdCl2 solutions. Additional reactions are related to the removal of excess sodium sulfide by the release of hydrogen sulfide and oxidation to sulfur using carbogen gas (5% CO2, 95% O2) followed by aeration.

Original languageEnglish
Pages (from-to)1231-1234
Number of pages4
Issue number7
Publication statusPublished - May 2006


  • Bentonite
  • Carbogen gas
  • Heavy metal spill
  • Solubility product
  • Sulfide oxidation

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

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