Effect of attapulgite calcination on heavy metal adsorption from acid mine drainage

Thabo Falayi, Freeman Ntuli

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Attapulgite calcined at 973.15K was characterized and utilized as an adsorbent for the removal of heavy metals and neutralization of acid mine drainage (AMD) from a gold mine. Batch adsorption experiments were carried out using a thermostatic shaker. Activated attapulgite showed that it can neutralize AMD as it raised the pH from 2.6 to 7.3 after a residence time of 2 h. Metal ion removal after 2 h was 100% for Cu (II), 99.46% for Fe (II), 96.20% for Co (II), 86.92% for Ni (II) and 71.52% for Mn (II) using a 2.5% w/v activated attapulgite loading. The adsorption best fit the Langmuir isotherm; however, Cu (II), Co (II), and Fe (II) data fit the Freundlich isotherm as well. Calcination at 973.15 K resulted in the reduction of the equilibrium residence time from 4 to 2 h, solid loading reduction from 10 to 2.5% m/v and an increase in maximum adsorption capacity compared with unactivated attapulgite.

Original languageEnglish
Pages (from-to)707-716
Number of pages10
JournalKorean Journal of Chemical Engineering
Issue number4
Publication statusPublished - 1 Apr 2015


  • Acid Mine Drainage
  • Adsorption
  • Attapulgite
  • Calcination
  • Heavy Metal Removal

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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