Predominant mechanisms for the removal of nickel metal ion from aqueous solution using cement kiln dust

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The experimental methodology achieved in the present study signified that the adsorption and precipitation were main mechanisms occurred together in the removal of nickel from aqueous solution by sorption using cement kiln dust (CKD) byproduct as sorbent. Finding the contribution of each mechanism in the removal process and derivation an analytical model for finding the portion of precipitation were the focal points of this work. Results proved that pure precipitation was increased with the increase of CKD dosage and metal concentration where total removal (adsorption-precipitation) ranged from 45 to 100%. The SEM micrographs of the CKD sorbent before and after sorption process certified that there was crystal precipitates on the surface of the CKD. Also, these graphs in combination with FT-IR tests proved that [Ni(OH2)n]+2 (n=4-6) species were bonded with CKD and insoluble hydroxide species may be precipitated onto the CaO surfaces by co-precipitation, while K–O, Si-O and Ca-O groups enhanced the adsorption mechanism.


  • Ziad T. Abd Ali
  • Laith A. Naji
  • Suhad A.A.A.N. Almuktar
  • Ayad A.H. Faisal
  • Suhail N. Abed
  • Miklas Scholz
  • Mu Naushad
  • Tansir Ahamad
External organisations
  • University of Basrah
  • University of Salford
  • University of Johannesburg
  • University of Baghdad, Iraq
  • King Saud University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Water Engineering


  • Acidic wastewater, Cement kiln dust, Co-precipitation, Precipitation, Sorption
Original languageEnglish
Article number101033
JournalJournal of Water Process Engineering
Publication statusPublished - 2020
Publication categoryResearch