Application of response surface methodology for optimization of Co(II) removal from synthetic wastewater by adsorption on NiO nanoparticles

Varsha Srivastava, Y. C. Sharma, Mika Sillanpää

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


Abstract The present manuscript deals with the synthesis and application of NiO nanoparticles for the removal of Co(II) ions from synthetic wastewater. NiO nanoparticles were synthesized at 500°C calcination temperature. Synthesized nanoparticles were characterized by XRD, TEM, SEM and FTIR. TEM revealed the formation of nanosized particles. Central composite design (CCD) of the response surface methodology (RSM) was employed to optimize the important adsorption parameters viz. Co(II) concentration, pH of Co(II) solution and adsorbent dosage. Co(II) adsorption followed pseudo second order kinetic model. Thermodynamic study confirmed the feasibility of Co(II) adsorption and also revealed the exothermic nature of adsorption. Various two and three parameter isotherms were studied and the best fit isotherm was determined by the standard deviation and chi square test. Redlich-Peterson isotherm was found to be the most suitable isotherm for Co(II) adsorption. Langmuir adsorption capacity of nanoparticles was determined to be 149.51 mgg-1. NiO nanoparticles were found to be efficient in Co(II) adsorption in the presence of anions like Cl- and PO43- while the presence of SO42-, NO3- NO3- and CO32- decreased their removal efficiency. Significant removal of Co(II) ions was observed in the presence of other cations.

Original languageEnglish
Article number5013
Pages (from-to)613-620
Number of pages8
JournalJournal of Molecular Liquids
Publication statusPublished - 11 Aug 2015
Externally publishedYes


  • Adsorption
  • Central composite design
  • Cobalt
  • Isotherm
  • Nanoparticle

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry


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