Thermo-XRD-analysis and peptization study of the adsorption of alizarinate by Co-, Ni-, and Cu-montmorillonite

Malka Epstein, Isaak Lapides, Shmuel Yariv*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The adsorption of the monovalent anionic dye alizarinate onto Co-, Ni- and Cu-montmorillonite was carried out by adding the dye into aqueous clay suspensions. During the loading of the clay suspension by alizarinate, only some of the added organic anion is adsorbed by the clay forming d-coordination chelate complexes on the clay surface. Maximum adsorption of Co-, Ni- and Cu-clay were 13, 13 and 25 mmol dye per 100 g clay. Since the capacity of the clay for these transition metal cations is 38 mmol per 100 g clay, these saturations indicate that only part of the transition metal cations form positively charged d-coordination chelate complexes with metal:ligand ratio of 1. The complex cations can be located inside the interlayer spaces or on the broken bonds surfaces. Thermo-XRD-analysis and peptization studies of the solids and the clay water systems respectively were used here to identify the sorption sites. The Co and Ni complexes were obtained on the broken bonds surfaces whereas the Cu complexes were obtained in the interlayer space. Co2+, Ni2+ and Cu2+ were extracted from the clay into suspensions containing excess alizarinate.

Original languageEnglish
Pages (from-to)604-611
Number of pages8
JournalColloid and Polymer Science
Volume283
Issue number6
DOIs
StatePublished - Mar 2005

Keywords

  • Alizarinate adsorption
  • Co-alizarinate complex
  • Cu-alizarinate complex
  • Montmorillonite
  • Ni-alizarinate complex
  • Peptization
  • Thermo-XRD-analysis

Fingerprint

Dive into the research topics of 'Thermo-XRD-analysis and peptization study of the adsorption of alizarinate by Co-, Ni-, and Cu-montmorillonite'. Together they form a unique fingerprint.

Cite this