A fundamental study of octanohydroxamic acid adsorption on monazite surfaces

Wencai Zhang, Rick Honaker

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The adsorption mechanism of octanohydroxamic acid (OHA) on monazite was studied using kinetic, isotherm, and thermodynamic adsorption tests as well as FTIR, titration, and micro-flotation experiments. The adsorption mechanism was described as a chemisorption/surface precipitation process. At low OHA concentrations, adsorption occurred by chemisorption as a result of the reaction between surface active sites and OHA molecules. With an increase in concentration and interaction time, surface precipitation occurred. For chemisorption, adsorption was an exothermic and entropy driven process and maximum adsorption was achieved at pH 9.0 due to more active sites. In an acidic environment, such as pH 3.0, adsorption was achieved via chemisorption and hydrophobic bonding. However, a strong basic and higher temperature environment contributes to surface precipitation of basic rare earth hydroxamate. FTIR tests showed the movement of –CH2 band position from 2924 cm− 1 to 2920 cm− 1 with increases in pH values from 3.0 to 6.0, 9.0, and 11.0, which corresponds to the status of chemisorbed and surface precipitated OHA, respectively.

Original languageEnglish
Pages (from-to)26-36
Number of pages11
JournalInternational Journal of Mineral Processing
StatePublished - Jul 10 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.


  • Adsorption kinetics
  • Adsorption mechanism
  • Flotation
  • Hydroxamic acid
  • Monazite

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geochemistry and Petrology


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